Broadcast receiving device

Abstract

This broadcast receiving device comprises: a third decoder unit that acquires, from a first video stream received in a basic layer, first content of a broadcast program for which protection by first protection information is defined, and acquires, from a second video stream received in a sub-layer, second content of a broadcast program for which protection by second protection information is defined; a storage unit that stores broadcast program information including the acquired first content and second content; and a main control unit that performs copy control of the broadcast program information on the basis of the first protection information and the second protection information. The first protection information is information defining a first condition related to copying of the first content, and the second protection information is information defining a second condition related to copying of the second content.

Description

Broadcast receiving device

[0001] The present invention relates to a broadcast receiving device.

[0002] Digital broadcasting services have been available in many countries since the late 1990s, replacing traditional analog broadcasting services. Digital broadcasting services have achieved improvements in broadcast quality using error correction technology, multi-channelization using compression coding technology, and multimedia services using HD (High Definition), BML (Broadcast Markup Language), and HTML5 (Hyper Text Markup Language version 5).

[0003] In recent years, advanced digital broadcasting systems have been under study in various countries with the aim of further improving frequency utilization efficiency, increasing resolution, enhancing functionality, and protecting content.

[0004] JP 2016-144020 A

[0005] It has been more than 10 years since the current digital broadcasting service began, and broadcast receiving devices capable of receiving the current digital broadcasting service are widely available. Therefore, when the advanced digital broadcasting service currently under consideration is launched, compatibility with the current digital broadcasting service must be considered. In other words, it is desirable to realize UHD (Ultra High Definition) video signals while maintaining the viewing environment of the current digital broadcasting service.

[0006] A system described in Patent Document 1 is a technology for realizing UHD broadcasting in digital broadcasting services. However, the system described in Patent Document 1 is intended to replace current digital broadcasting and does not take into consideration the protection of content broadcast in digital broadcasting. For example, in advanced digital systems, data encoded in multiple layers, such as a base layer and sublayers different from the base layer, may be broadcast. In such cases, the hierarchically encoded content broadcast in the sublayers is not adequately protected.

[0007] An object of the present invention is to provide a technique for strengthening content protection.

[0008] The technology described in the claims is used as a means for solving the above problems.

[0009] For example, a digital broadcast receiving device includes a decoder unit that acquires, from a first video stream received in a base layer, first content of a broadcast program for which protection by first protection information is specified, and acquires, from a second video stream received in a sublayer, second content of the broadcast program for which protection by second protection information is specified, a storage unit that stores broadcast program information including the first content and the second content acquired by the decoder unit, and a control unit that performs copy control of the broadcast program information based on the first protection information and the second protection information. The first protection information is information that specifies a first condition regarding copying of the first content. The second protection information is information that specifies a second condition regarding copying of the second content.

[0010] According to the present invention, it is possible to provide a technology for strengthening content protection.

[0011] FIG. 1 is a system configuration diagram of a broadcasting system according to an embodiment of the present invention. FIG. 2 is a block diagram of a broadcast receiving device according to an embodiment of the present invention. FIG. 3 is a detailed block diagram of a first tuner / demodulator unit of the broadcast receiving device according to an embodiment of the present invention. FIG. 4 is a detailed block diagram of a second tuner / demodulator unit of the broadcast receiving device according to an embodiment of the present invention. FIG. 5 is a detailed block diagram of a third tuner / demodulator unit of the broadcast receiving device according to an embodiment of the present invention. FIG. 6 is a detailed block diagram of a fourth tuner / demodulator unit of the broadcast receiving device according to an embodiment of the present invention. FIG. 7 is a detailed block diagram of a first decoder unit of the broadcast receiving device according to an embodiment of the present invention. FIG. 8 is a detailed block diagram of a second decoder unit of the broadcast receiving device according to an embodiment of the present invention. FIG. 9 is a software configuration diagram of a broadcast receiving device according to an embodiment of the present invention. FIG. 10 is a configuration diagram of a broadcast station server according to an embodiment of the present invention. FIG. 11 is a configuration diagram of a service provider server according to an embodiment of the present invention. FIG. 12 is a block diagram of a mobile information terminal according to an embodiment of the present invention. FIG. 13 is a software configuration diagram of a mobile information terminal according to an embodiment of the present invention. FIG. 14 is a diagram illustrating a segment configuration for digital broadcasting according to an embodiment of the present invention. FIG. 15 is a diagram illustrating hierarchical allocation in hierarchical transmission for digital broadcasting according to an embodiment of the present invention. FIG. 16 is a diagram illustrating a process of generating an OFDM transmission wave for digital broadcasting according to an embodiment of the present invention. FIG. 17 is a diagram illustrating the basic configuration of a transmission path coding unit for digital broadcasting according to an embodiment of the present invention. FIG. 1 is a diagram for explaining segment parameters of an OFDM system for digital broadcasting according to an embodiment of the present invention. FIG. 2 is a diagram for explaining transmission signal parameters for digital broadcasting according to an embodiment of the present invention. FIG. 3 is a diagram for explaining an arrangement of pilot signals of a synchronous modulation segment for digital broadcasting according to an embodiment of the present invention. FIG. 4 is a diagram for explaining an arrangement of pilot signals of a differential modulation segment for digital broadcasting according to an embodiment of the present invention. FIG. 5 is a diagram for explaining bit allocation of TMCC carriers for digital broadcasting according to an embodiment of the present invention. FIG. 6 is a diagram for explaining bit allocation of TMCC information for digital broadcasting according to an embodiment of the present invention. FIG. 7 is a diagram for explaining transmission parameter information of TMCC information for digital broadcasting according to an embodiment of the present invention. FIG. 8 is a diagram for explaining system identification of TMCC information for digital broadcasting according to an embodiment of the present invention. FIG. 9 is a diagram for explaining a carrier modulation mapping scheme for TMCC information for digital broadcasting according to an embodiment of the present invention.1 is a diagram illustrating frequency conversion processing identification of TMCC information for digital broadcasting according to an embodiment of the present invention. FIG. 2 is a diagram illustrating physical channel number identification of TMCC information for digital broadcasting according to an embodiment of the present invention. FIG. 3 is a diagram illustrating main signal identification of TMCC information for digital broadcasting according to an embodiment of the present invention. FIG. 4 is a diagram illustrating 4K signal transmission layer identification of TMCC information for digital broadcasting according to an embodiment of the present invention. FIG. 5 is a diagram illustrating additional layer transmission identification of TMCC information for digital broadcasting according to an embodiment of the present invention. FIG. 6 is a diagram illustrating identification of a coding rate of an inner code of TMCC information for digital broadcasting according to an embodiment of the present invention. FIG. 7 is a diagram illustrating bit allocation of an AC signal for digital broadcasting according to an embodiment of the present invention. FIG. 8 is a diagram illustrating configuration identification of an AC signal for digital broadcasting according to an embodiment of the present invention. FIG. 9 is a diagram illustrating earthquake warning information for an AC signal for digital broadcasting according to an embodiment of the present invention. FIG. 10 is a diagram illustrating signal identification of earthquake warning information for AC signal for digital broadcasting according to an embodiment of the present invention. FIG. 11 is a diagram illustrating earthquake warning detailed information for earthquake warning information for AC signal for digital broadcasting according to an embodiment of the present invention. FIG. 12 is a diagram illustrating additional information related to transmission control of modulated waves of an AC signal for digital broadcasting according to an embodiment of the present invention. FIG. 1 is a diagram for explaining transmission parameter additional information of an AC signal related to digital broadcasting according to an embodiment of the present invention. FIG. 2 is a diagram for explaining an error correction method for an AC signal related to digital broadcasting according to an embodiment of the present invention. FIG. 3 is a diagram for explaining a constellation format of an AC signal related to digital broadcasting according to an embodiment of the present invention. FIG. 4 is a diagram for explaining a polarization dual-mode transmission method according to an embodiment of the present invention. FIG. 5 is a system configuration diagram of a broadcasting system using a polarization dual-mode transmission method according to an embodiment of the present invention. FIG. 6 is a diagram for explaining frequency conversion processing according to an embodiment of the present invention. FIG. 7 is a diagram for explaining the configuration of a pass-through transmission method according to an embodiment of the present invention. FIG. 8 is a diagram for explaining a pass-through transmission band according to an embodiment of the present invention. FIG. 9 is a diagram for explaining the configuration of a pass-through transmission method according to an embodiment of the present invention. FIG. 10 is a diagram for explaining the pass-through transmission band according to an embodiment of the present invention. FIG. 11 is a diagram for explaining the pass-through transmission band according to an embodiment of the present invention.FIG. 1 is a diagram illustrating a single polarization transmission method according to an embodiment of the present invention. FIG. 2 is a system configuration diagram of a broadcasting system using the single polarization transmission method according to an embodiment of the present invention. FIG. 3 is a system configuration diagram of a broadcasting system using the single polarization transmission method according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a hierarchical division multiplexing transmission method according to an embodiment of the present invention. FIG. 5 is a system configuration diagram of a broadcasting system using the hierarchical division multiplexing transmission method according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a frequency conversion and amplification process according to an embodiment of the present invention. FIG. 7 is a system configuration diagram of a broadcasting system using the hierarchical division multiplexing transmission method according to an embodiment of the present invention. FIG. 8 is a diagram illustrating a protocol stack of an MPEG-2 TS. FIG. 9 is a diagram illustrating the names and functions of tables used in an MPEG-2 TS. FIG. 10 is a diagram illustrating the names and functions of tables used in an MPEG-2 TS. FIG. 11 is a diagram illustrating the names and functions of descriptors used in an MPEG-2 TS. FIG. 12 is a diagram illustrating the names and functions of descriptors used in an MPEG-2 TS. FIG. 13 is a diagram illustrating the names and functions of descriptors used in an MPEG-2 TS. 1 is a diagram explaining the names and functions of descriptors used in MPEG-2 TS. FIG. 1 is a diagram explaining a protocol stack in an MMT broadcast transmission path. FIG. 1 is a diagram explaining a protocol stack in an MMT communication line. FIG. 1 is a diagram explaining the names and functions of tables used in MMT TLV-SI. FIG. 1 is a diagram explaining the names and functions of descriptors used in MMT TLV-SI. FIG. 1 is a diagram explaining the names and functions of messages used in MMT-SI of MMT. FIG. 1 is a diagram explaining the names and functions of tables used in MMT-SI of MMT. FIG. 1 is a diagram explaining the names and functions of descriptors used in MMT-SI of MMT. FIG. 1 is a diagram explaining the names and functions of descriptors used in MMT-SI of MMT. FIG. 1 is a diagram explaining the relationship between MMT-based data transmission and each table. FIG. 1 is an operational sequence diagram of channel setting processing in a broadcast receiving device according to an embodiment of the present invention. FIG. 2 is a diagram explaining the data structure of a network information table. FIG. 2 is a diagram explaining the data structure of a terrestrial distribution system descriptor.1 is a diagram illustrating the data structure of a service list descriptor. FIG. 2 is a diagram illustrating the data structure of a TS information descriptor. FIG. 3 is an external view of a remote controller according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a banner display when selecting a channel according to an embodiment of the present invention. FIG. 5 is a diagram illustrating speaker layout. FIG. 6 is a diagram illustrating speaker layout. FIG. 7 is a diagram illustrating positional relationships when headphones are used. FIG. 8 is a diagram illustrating positional relationships when headphones are used. FIG. 9 is an example of the configuration of an audio decoder for an audio signal consisting of only a channel-based signal. FIG. 10 is an example of the configuration of an audio decoder for an advanced audio signal. FIG. 11 is an example of speaker system layout information. FIG. 12 is a diagram illustrating default values ​​of downmix coefficients from a 22.2ch signal to a 5.1ch signal. FIG. 13 is a diagram illustrating default values ​​of downmix coefficients from a 5.1ch signal to a 2ch signal. FIG. 14 is an example of a screen for selecting a speaker system to be used for audio playback. FIG. 15 is a diagram illustrating metadata of an object-based signal. FIG. 16 is an example of metadata specifying the playback position of an object-based signal. FIG. 17 is an example of a screen for selecting the playback position of an object-based signal. FIG. 18 is an example of a screen for setting the playback position of an object-based signal. FIG. 19 is an example of metadata specifying the playback position of an object-based signal. FIG. 19 is an example of stream data specifying the playback position of an object-based signal. FIG. 19 is a diagram illustrating the number of signals in an HOA system signal. FIG. 1 is a diagram of a selection screen for selecting an audio signal for each output device. FIG. 2 is a diagram illustrating audio playback in a linked device. FIG. 3 is a diagram illustrating parameters describing the number of audio signals to be transmitted and the acquisition source. FIG. 4 is a diagram illustrating the data structure of an audio component descriptor. FIG. 5 is a diagram illustrating data of audio component types. FIG. 6 is an example of displaying transmitted audio signals in an electronic program guide. FIG. 7 is an example of displaying transmitted audio signals in an electronic program guide. FIG. 8 is a diagram illustrating an example of displaying signal sources and output devices. FIG. 9 is a diagram illustrating an example of control of content protection processing according to the present embodiment. FIG. 10 is a diagram illustrating an example of control of content protection processing according to the present embodiment. FIG. 11 is a diagram illustrating an example of control of content protection processing according to the present embodiment. FIG. 12 is a diagram illustrating the data structure of an MMT package table.1 is a diagram illustrating asset type identification in an MMT package table according to the present embodiment. It is a diagram illustrating names and functions of descriptors used in MMT-SI of MMT according to the present embodiment. It is a diagram illustrating the data structure of an MH-HEVC descriptor. It is a diagram illustrating the data structure of an MH-VVC descriptor. It is a diagram illustrating the data structure of a video component descriptor. It is a diagram illustrating video aspect ratio identification in a video component descriptor according to the present embodiment. It is a diagram illustrating video frame rate identification in a video component descriptor according to the present embodiment. It is a diagram illustrating the data structure of an MH-MPEG-4 audio descriptor. It is a diagram illustrating the data structure of an MH-MPEG-H audio descriptor. It is a diagram illustrating the data structure of an MH-MPEG-H audio descriptor. It is a diagram illustrating the data structure of an AC-4 audio descriptor. It is a diagram illustrating the data structure of an extended terrestrial distribution system descriptor. It is a diagram illustrating guard interval identification in an extended terrestrial distribution system descriptor according to the present embodiment. It is a diagram illustrating mode information identification in an extended terrestrial distribution system descriptor according to the present embodiment. It is a diagram illustrating frequency offset identification in an extended terrestrial distribution system descriptor according to the present embodiment. It is a block diagram of a broadcast receiving device according to an embodiment of the present invention. FIG. 1 is a diagram illustrating a generation process of an OFDM transmission wave related to digital broadcasting according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a generation process of an OFDM transmission wave related to digital broadcasting according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a display of a base layer image related to an embodiment of the present invention. FIG. 4 is a diagram illustrating a display of a sub-layer image related to an embodiment of the present invention. FIG. 5 is a diagram illustrating a display of a sub-layer image related to an embodiment of the present invention. FIG. 6 is a diagram illustrating a base layer image and a sub-layer image related to an embodiment of the present invention. FIG. 7 is a diagram illustrating a generation process of an OFDM transmission wave and network transmission data related to digital broadcasting according to an embodiment of the present invention. FIG. 8 is a diagram illustrating a generation process of an OFDM transmission wave and network transmission data related to digital broadcasting according to an embodiment of the present invention. FIG. 9 is a diagram illustrating a display of a sub-layer image related to an embodiment of the present invention. FIG. 10 is a diagram illustrating a data structure of an MH-hierarchical coding descriptor. FIG. 11 is a diagram illustrating bit allocation for hierarchical coding types.FIG. 1 is a diagram illustrating the data structure of an MH-extension hierarchical coding descriptor. FIG. 2 is a diagram illustrating bit allocation for hierarchical coding service types. FIG. 3 is a diagram illustrating bit allocation for hierarchical coding service importance types. FIG. 4 is a diagram illustrating the data structure of an MH-extension hierarchical coding descriptor when content protection of sub-layers is strengthened. FIG. 5 is a diagram illustrating types of hierarchical coding content protection according to an embodiment of the present invention. FIG. 6 is a diagram illustrating an example of control of content protection processing according to an embodiment of the present invention. FIG. 7 is a diagram illustrating an example of control of content protection processing according to an embodiment of the present invention. FIG. 8 is a diagram illustrating an example of control of content protection processing according to an embodiment of the present invention. FIG. 9 is a diagram illustrating an example of a selection screen for selecting setting of a recording reservation according to an embodiment of the present invention. FIG. 10 is a diagram illustrating an example of a selection screen for selecting a recording mode according to an embodiment of the present invention. FIG. 11 is a diagram illustrating an example of a display screen showing a recorded program list according to an embodiment of the present invention. FIG. 12 is a diagram illustrating an example of the flow of a copy process according to an embodiment of the present invention.

[0012] Hereinafter, examples of embodiments of the present invention will be described with reference to the drawings.

[0013] (First embodiment) [System configuration] Fig. 1 is a system configuration diagram showing an example of the configuration of a broadcasting system.

[0014] The broadcasting system is composed of, for example, a broadcast receiving device 100 and an antenna 200, a broadcasting station radio tower 300 and a broadcasting station server 400, a service provider server 500, a mobile telephone communication server 600 and a base station 600B of a mobile telephone communication network, a portable information terminal 700, a broadband network 800 such as the Internet, and a router device 800R. Various server devices and communication devices may also be connected to the Internet 800.

[0015] The broadcast receiving device 100 is a television receiver equipped with a function for receiving advanced digital broadcasting services. The broadcast receiving device 100 may also be equipped with a function for receiving existing digital broadcasting services. Furthermore, the broadcast receiving device 100 can support a broadcast / communication integrated system that integrates a digital broadcasting service (existing digital broadcasting service or advanced digital broadcasting service) with a function using a broadband network, thereby combining the digital broadcasting service with additional content acquisition via the broadband network, computational processing in a server device, and presentation processing in collaboration with a mobile terminal device. The broadcast receiving device 100 receives digital broadcast waves transmitted from a radio tower 300 via an antenna 200. The digital broadcast waves may be transmitted directly from the radio tower 300 to the antenna 200 or may be transmitted via a broadcast satellite or communication satellite (not shown). The broadcast receiving device 100 may also receive broadcast signals retransmitted by a cable television station via a cable line. The broadcast receiving device 100 can also be connected to the Internet 800 via a router device 800R, enabling it to communicate with and send data to and receive data from each server device on the Internet 800. The broadcast receiving device 100 may be configured as a display device having a flat display with fixed pixels, or as a projector having a liquid crystal or digital mirror display panel and a projection optical system, which projects an image onto a surface such as a screen.

[0016] Router device 800R is connected to Internet 800 via wireless or wired communication, and is also connected to broadcast receiving device 100 via wired communication and to portable information terminal 700 via wireless communication. This allows each server device on Internet 800, broadcast receiving device 100, and portable information terminal 700 to mutually transmit and receive data via router device 800R. Router device 800R, broadcast receiving device 100, and portable information terminal 700 constitute a LAN (Local Area Network). Note that communication between broadcast receiving device 100 and portable information terminal 700 may be performed directly using a method such as Bluetooth (registered trademark) or NFC (Near Field Communication) without going through router device 800R.

[0017] Radio tower 300 is a broadcasting facility of the broadcasting station, and transmits digital broadcast waves including various control information related to digital broadcasting services and broadcast program content data (video content, audio content, etc.). The broadcasting station also includes a broadcasting station server 400. Broadcasting station server 400 stores broadcast program content data and metadata for each broadcast program, such as the program title, program ID, program summary, cast, and broadcast date and time. Broadcasting station server 400 provides the content data and metadata to service providers based on a contract. The content data and metadata are provided to service providers via an API (Application Programming Interface) provided by broadcasting station server 400.

[0018] The service provider server 500 is a server device prepared by a service provider to provide services through the broadcasting and communication collaboration system. The service provider server 500 stores, manages, and distributes content data and metadata provided by the broadcasting station server 400, as well as content data and applications (operating programs and / or various data, etc.) created for the broadcasting and communication collaboration system. It also has a function of searching for and providing a list of available applications in response to inquiries from television receivers. The storage, management, and distribution of the content data and metadata and the storage, management, and distribution of the applications may be performed by different server devices. The broadcasting station and the service provider may be the same or different providers. Multiple service provider servers 500 may be provided for different services. The functions of the service provider server 500 may also be provided by the broadcasting station server 400.

[0019] Mobile telephone communication server 600 is connected to the Internet 800, and is also connected to mobile information terminal 700 via base station 600B. Mobile telephone communication server 600 manages telephone communications (calls) and data transmission / reception of mobile information terminal 700 via the mobile telephone communication network, and enables transmission / reception of data between mobile information terminal 700 and each server device on Internet 800. Note that communication between mobile information terminal 700 and broadcast receiving device 100 may be performed via base station 600B, mobile telephone communication server 600, Internet 800, and router device 800R.

[0020] 2A is a block diagram showing an example of the internal configuration of broadcast receiving device 100. Broadcast receiving device 100 is composed of a main control unit 101, a system bus 102, ROM 103, RAM 104, a storage (accumulation) unit 110, a LAN communication unit 121, an expansion interface unit 124, a digital interface unit 125, a first tuner / demodulation unit 130C, a second tuner / demodulation unit 130T, a third tuner / demodulation unit 130L, a fourth tuner / demodulation unit 130B, a first decoder unit 140S, a second decoder unit 140U, an operation input unit 180, a video selection unit 191, a monitor unit 192, a video output unit 193, an audio selection unit 194, a speaker unit 195, and an audio output unit 196.

[0021] The main control unit 101 is a microprocessor unit that controls the entire broadcast receiving device 100 in accordance with a predetermined operation program. The system bus 102 is a communication path for transmitting and receiving various data, commands, etc. between the main control unit 101 and each operation block within the broadcast receiving device 100.

[0022] ROM (Read Only Memory) 103 is a non-volatile memory that stores basic operating programs such as an operating system and other operating programs. For example, a rewritable ROM such as an EEPROM (Electrically Erasable Programmable ROM) or a flash ROM is used. Also, ROM 103 stores operational setting values ​​and the like required for the operation of broadcast receiving device 100. RAM (Random Access Memory) 104 serves as a work area when the basic operating programs and other operating programs are executed. ROM 103 and RAM 104 may be integrated with main control unit 101. Also, ROM 103 may not be configured as an independent unit as shown in FIG. 2A , but may use a portion of the storage area within storage unit 110.

[0023] The storage (accumulation) unit 110 stores the operating program and operation setting values ​​of the broadcast receiving device 100, personal information of the user of the broadcast receiving device 100, etc. It can also store operating programs downloaded via the Internet 800 and various data created by the operating programs. It can also store content such as moving images, still images, and audio acquired from broadcast waves or downloaded via the Internet 800. A portion of the storage (accumulation) unit 110 may replace all or part of the functions of the ROM 103. Furthermore, the storage (accumulation) unit 110 needs to retain the stored information even when power is not supplied to the broadcast receiving device 100 from an external source. Therefore, devices such as semiconductor element memories such as flash ROMs and SSDs (Solid State Drives), and magnetic disk drives such as HDDs (Hard Disc Drives), etc., are used.

[0024] The operating programs stored in the ROM 103 and storage unit 110 can be added to, updated, and have their functions expanded by downloading from server devices on the Internet 800 or broadcast waves.

[0025] The LAN communication unit 121 is connected to the Internet 800 via the router device 800R and transmits and receives data to and from each server device and other communication devices on the Internet 800. It also acquires program content data (or a portion thereof) transmitted via a communication line. The connection to the router device 800R may be a wired connection or a wireless connection such as Wi-Fi (registered trademark). The LAN communication unit 121 includes an encoding circuit, a decoding circuit, and the like. The broadcast receiving device 100 may also include other communication units such as a Bluetooth (registered trademark) communication unit, an NFC communication unit, or an infrared communication unit. When the LAN communication unit 121 communicates via a wired connection, the LAN communication unit 121 may include hardware having a terminal compliant with an Ethernet standard such as 10BASE-T, 100BASE-TX, or 1000BASE-T, and communication may be performed via this hardware. When the LAN communication unit 121 communicates wirelessly, the LAN communication unit 121 may be configured as a wireless communication interface. The LAN communication unit 121 may function as an IP interface, which is one of the high-speed digital interfaces of the broadcast receiving device 100. For example, the broadcast receiving device 100 may be configured to output a packet stream containing encoded digital video data and / or digital audio data of content received as an IP interface output. When copy-restricted content is output to an external device as an IP interface output via the LAN communication unit 121, the content is protected and output in accordance with various DTCP (Digital Transmission Content Protection) specifications, such as the DTCP specification and the DTCP2 specification.

[0026] The first tuner / demodulator 130C, the second tuner / demodulator 130T, the third tuner / demodulator 130L, and the fourth tuner / demodulator 130B each receive broadcast waves of a digital broadcast service and perform channel selection by tuning to a channel of a predetermined service under the control of the main controller 101. Furthermore, they perform processes such as demodulation and waveform shaping of the modulated waves of the received signal, as well as frame structure and hierarchical structure reconstruction, energy despreading, and error correction decoding to reproduce a packet stream. They also extract and decode a transmission TMCC (Transmission Multiplexing Configuration Control) signal from the received signal.

[0027] The first tuner / demodulator 130C can input digital broadcast waves of a current terrestrial digital broadcasting service received by antenna 200C, which is an antenna for receiving current terrestrial digital broadcasting. The first tuner / demodulator 130C can also input a broadcast signal of one of horizontally (H) polarized signals and vertically (V) polarized signals of dual-polarized terrestrial digital broadcasting (described below) and demodulate a hierarchical segment that employs the same modulation method as the current terrestrial digital broadcasting service. The first tuner / demodulator 130C can also input a broadcast signal of single-polarized terrestrial digital broadcasting (described below) and demodulate a hierarchical segment that employs the same modulation method as the current terrestrial digital broadcasting service. The first tuner / demodulator 130C can also input a broadcast signal of layer division multiplexed terrestrial digital broadcasting (described below) and demodulate a hierarchical segment that employs the same modulation method as the current terrestrial digital broadcasting service.

[0028] The second tuner / demodulator 130T inputs digital broadcast waves of an advanced terrestrial digital broadcasting service received by antenna 200T, a dual-polarized terrestrial digital broadcasting receiving antenna, via converter 201T. Alternatively, the second tuner / demodulator 130T may input digital broadcast waves of an advanced terrestrial digital broadcasting service received by a single-polarized terrestrial digital broadcasting receiving antenna (not shown). When the second tuner / demodulator 130T inputs digital broadcast waves of an advanced terrestrial digital broadcasting service from a single-polarized terrestrial digital broadcasting receiving antenna (not shown), the digital broadcast waves may not be input via converter 201T. The antenna 200T for receiving digital broadcast waves of dual-polarized terrestrial digital broadcasting includes an element for receiving horizontally polarized signals and an element for receiving vertically polarized signals. The single-polarized terrestrial digital broadcasting receiving antenna (not shown) includes either an element for receiving horizontally polarized signals or an element for receiving vertically polarized signals. The single-polarized terrestrial digital broadcast receiving antenna (not shown) may be used in common with antenna 200C, which is the current terrestrial digital broadcast receiving antenna.

[0029] The third tuner / demodulator 130L receives, via a converter 201L, digital broadcast waves of an advanced terrestrial digital broadcasting service received by an antenna 200L, which is an antenna for receiving layer division multiplexed terrestrial digital broadcasting.

[0030] Fourth tuner / demodulator 130B receives digital broadcast waves of an advanced BS (Broadcasting Satellite) digital broadcast service or an advanced CS (Communication Satellite) digital broadcast service via converter 201B. The term "tuner / demodulator" refers to a component having a tuner function and a demodulator function.

[0031] Furthermore, antenna 200C, antenna 200T, antenna 200L, antenna 200B, conversion unit 201T, conversion unit 201L, and conversion unit 201B do not constitute part of broadcast receiving device 100, but belong to the facility side, such as the building in which broadcast receiving device 100 is installed.

[0032] The current terrestrial digital broadcasting described above is a broadcast signal of a terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels.

[0033] Furthermore, while details of dual-polarized terrestrial digital broadcasting (advanced terrestrial digital broadcasting employing a dual-polarized transmission method) and single-polarized terrestrial digital broadcasting (advanced terrestrial digital broadcasting employing a single-polarized transmission method) will be described later, they are broadcast signals of a terrestrial digital broadcasting service capable of transmitting video with a maximum resolution of more than 1920 horizontal pixels by 1080 vertical pixels. Dual-polarized terrestrial digital broadcasting is terrestrial digital broadcasting that uses multiple polarized waves, namely horizontal (H) polarization and vertical (V) polarization, and transmits a terrestrial digital broadcasting service that can transmit video with a maximum resolution of more than 1920 horizontal pixels by 1080 vertical pixels in some divided segments of both of the multiple polarized waves. Single-polarized terrestrial digital broadcasting is terrestrial digital broadcasting that uses either horizontal (H) polarization or vertical (V) polarization, and transmits a terrestrial digital broadcasting service that can transmit video with a maximum resolution of more than 1920 horizontal pixels by 1080 vertical pixels in some divided segments.

[0034] In the description of each embodiment of the present invention, when the term "multiple polarized waves" is used in relation to dual-polarized terrestrial digital broadcasting, it refers to two polarized waves, horizontal (H) and vertical (V), unless otherwise specified. Furthermore, when the term "polarized waves" is simply used, it also refers to a "polarized signal." Furthermore, in one or both of the multiple polarized waves, some of the divided segments can transmit the above-mentioned current terrestrial digital broadcasting, which transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels, using the same modulation method. In other words, in dual-polarized terrestrial digital broadcasting, different segments of the multiple polarized waves in each embodiment of the present invention can simultaneously transmit the current terrestrial digital broadcasting service, which transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels, and the terrestrial digital broadcasting service, which can transmit video with a maximum resolution exceeding 1920 horizontal pixels by 1080 vertical pixels. Furthermore, single-polarized terrestrial digital broadcasting can transmit the above-mentioned current terrestrial digital broadcasting, which transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels, using the same modulation method in some of the divided segments. That is, single-polarized terrestrial digital broadcasting can simultaneously transmit, in different segments in each embodiment of the present invention, a current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels and a terrestrial digital broadcasting service that can transmit video with a maximum resolution of more than 1920 horizontal pixels by 1080 vertical pixels.

[0035] Furthermore, although details of hierarchical division multiplexing terrestrial digital broadcasting (advanced terrestrial digital broadcasting employing a hierarchical division multiplexing transmission method) will be described later, it is a broadcast signal of a terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels by 1080 vertical pixels. Hierarchical division multiplexing terrestrial digital broadcasting multiplexes a plurality of digital broadcasting signals with different signal levels. Note that digital broadcasting signals with different signal levels refer to digital broadcasting signals with different transmission powers. The hierarchical division multiplexing terrestrial digital broadcasting of each embodiment of the present invention is capable of hierarchically multiplexing and transmitting, as the plurality of digital broadcasting signals with different signal levels, a broadcast signal of a current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels and a broadcast signal of a terrestrial digital broadcasting service that can transmit video with a maximum resolution exceeding 1920 horizontal pixels by 1080 vertical pixels, in the frequency band of the same physical channel. In other words, in the layer-division multiplexed terrestrial digital broadcasting of each embodiment of the present invention, it is possible to simultaneously transmit, on multiple layers with different signal levels, a current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically, and a terrestrial digital broadcasting service that can transmit video with a maximum resolution of more than 1920 pixels horizontally by 1080 pixels vertically.

[0036] Note that the broadcast receiving device in each embodiment of the present invention need only be configured to be able to optimally receive advanced digital broadcasts, and does not necessarily need to include all of the first tuner / demodulator 130C, second tuner / demodulator 130T, third tuner / demodulator 130L, and fourth tuner / demodulator 130B. For example, it is sufficient to include at least either the second tuner / demodulator 130T or the third tuner / demodulator 130L. Furthermore, to achieve more advanced functionality, the broadcast receiving device may include one or more of the above four tuner / demodulators in addition to either the second tuner / demodulator 130T or the third tuner / demodulator 130L.

[0037] Furthermore, antenna 200C, antenna 200T, and antenna 200L may be shared as appropriate. Furthermore, among first tuner / demodulation unit 130C, second tuner / demodulation unit 130T, and third tuner / demodulation unit 130L, a plurality of tuner / demodulation units may be shared (or integrated) as appropriate.

[0038] The first decoder unit 140S and the second decoder unit 140U each input a packet stream output from the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, the third tuner / demodulation unit 130L, or the fourth tuner / demodulation unit 130B, or a packet stream acquired from each server device on the Internet 800 via the LAN communication unit 121. The packet streams input by the first decoder unit 140S and the second decoder unit 140U may be packet streams in formats such as MPEG (Moving Picture Experts Group)-2 TS (Transport Stream), MPEG-2 PS (Program Stream), TLV (Type Length Value), or MMT (MPEG Media Transport).

[0039] The first decoder unit 140S and the second decoder unit 140U each perform conditional access (CA) processing, demultiplexing processing to separate and extract video data, audio data, various information data, etc. from the packet stream based on various control information included in the packet stream, decoding processing of video data and audio data, acquiring program information and generating an EPG (Electronic Program Guide), playback processing of data broadcasting screens and multimedia data, etc. They also perform processing to superimpose the generated EPG and played multimedia data with the decoded video data and audio data.

[0040] The video selection unit 191 receives the video data output from the first decoder unit 140S and the video data output from the second decoder unit 140U, and performs appropriate selection and / or superimposition processing based on the control of the main control unit 101. The video selection unit 191 also performs appropriate scaling processing and OSD (On Screen Display) data superimposition processing. The monitor unit 192 is a display device such as a liquid crystal panel, and displays the video data selected and / or superimposed by the video selection unit 191 and provides it to the user of the broadcast receiving device 100. The video output unit 193 is a video output interface that outputs the video data selected and / or superimposed by the video selection unit 191 to the outside. The video output unit 193 may be a video output interface via an HDMI (High-Definition Multimedia Interface) terminal. Furthermore, it may be a video output interface that outputs video to the outside via wireless communication. When video of copy-restricted content is output from the video output unit 193, the video is protected in accordance with the HDCP (High-Bandwidth Digital Content Protection) specification before being output.

[0041] The audio selection unit 194 receives the audio data output from the first decoder unit 140S and the audio data output from the second decoder unit 140U, and performs appropriate processing such as selection and / or mixing under the control of the main control unit 101. The speaker unit 195 outputs the audio data selected and / or mixed by the audio selection unit 194 and provides it to the user of the broadcast receiving device 100. The audio output unit 196 is an audio output interface that outputs the audio data selected and / or mixed by the audio selection unit 194 to the outside. The audio output unit 196 may be an audio output interface via an HDMI terminal. Alternatively, it may be an audio output interface that outputs audio to the outside via wireless communication. When audio of copy-restricted content is output from the audio output unit 196, it is output after being protected in accordance with the HDCP specification.

[0042] The video output unit 193 and the audio output unit 196 may be integrated to form a video and audio output interface via an HDMI terminal.

[0043] The digital interface unit 125 is an interface that outputs or inputs a packet stream containing encoded digital video data and / or digital audio data. The digital interface unit 125 can directly output the packet stream input by the first decoder unit 140S or the second decoder unit 140U from the first tuner / demodulator unit 130C, the second tuner / demodulator unit 130T, the third tuner / demodulator unit 130L, or the fourth tuner / demodulator unit 130B. The digital interface unit 125 may also control a packet stream input from an external source via the digital interface unit 125 to be input to the first decoder unit 140S or the second decoder unit 140U, or to be stored in the storage unit 110. Alternatively, the digital interface unit 125 may output video data or audio data separated and extracted by the first decoder unit 140S or the second decoder unit 140U. Furthermore, the digital interface unit 125 may control video data and audio data input from outside to be input to the first decoder unit 140S or the second decoder unit 140U, or to be stored in the storage (accumulation) unit 110. An example of the digital interface unit 125 may be an output interface that outputs as an HDMI Ethernet channel via an HDMI terminal. When copy-restricted content is output to an external device as an IP interface output via the digital interface unit 125, the content is protected and output in accordance with various DTCP (Digital Transmission Content Protection) specifications, such as the DTCP specification and the DTCP2 specification.

[0044] The expansion interface unit 124 is a group of interfaces for expanding the functions of the broadcast receiving device 100, and is composed of an analog video / audio interface, a USB (Universal Serial Bus) interface, a memory interface, etc. The analog video / audio interface inputs analog video signals / audio signals from external video / audio output devices, outputs analog video signals / audio signals to external video / audio input devices, etc. The USB interface connects to a PC or the like to send and receive data. A HDD may be connected to record broadcast programs and other content data. A keyboard or other USB device may also be connected. The memory interface connects a memory card or other memory medium to send and receive data.

[0045] The operation input unit 180 is an instruction input unit that inputs operation instructions to the broadcast receiving device 100, and is composed of a remote control receiving unit that receives commands transmitted from a remote control (remote controller) not shown in the figure, and an operation key with an array of button switches. Only one of them may be provided. The operation input unit 180 can also be replaced by a touch panel or the like placed on top of the monitor unit 192. It can also be replaced by a keyboard or the like connected to the extended interface unit 124. The remote control can be replaced by a mobile information terminal 700 equipped with a remote control command transmission function. Note that all of the "keys" provided on the remote control described in the following embodiments may also be referred to as "buttons."

[0046] Note that if the broadcast receiving device 100 is a television receiver or the like, the video output unit 193 and the audio output unit 196 are not required components. Furthermore, the broadcast receiving device 100 may be an optical disk drive recorder such as a DVD (Digital Versatile Disc) recorder, a magnetic disk drive recorder such as an HDD recorder, an STB (Set Top Box), or the like. It may also be a PC (Personal Computer) or tablet terminal equipped with a digital broadcast service reception function. If the broadcast receiving device 100 is a DVD recorder, HDD recorder, STB, or the like, the monitor unit 192 and the speaker unit 195 are not required components. Connecting an external monitor and external speakers to the video output unit 193 and the audio output unit 196 or the digital interface unit 125 enables operation similar to that of a television receiver or the like. FIG. 2B is a block diagram showing an example of the detailed configuration of the first tuner / demodulator 130C.

[0047] The channel selection / detection unit 131C inputs the current digital broadcast wave received by the antenna 200C and selects a channel based on the channel selection control signal. The TMCC decoding unit 132C extracts the TMCC signal from the output signal of the channel selection / detection unit 131C and acquires various TMCC information. The acquired TMCC information is used to control each process in the subsequent stages. Details of the TMCC signal and TMCC information will be described later.

[0048] The demodulation unit 133C inputs a modulated wave modulated using a method such as QPSK (Quadrature Phase Shift Keying), DQPSK (Differential QPSK), 16QAM (Quadrature Amplitude Modulation), or 64QAM based on TMCC information, etc., and performs demodulation processing including frequency deinterleaving, time deinterleaving, carrier demapping, etc. The demodulation unit 133C may be capable of supporting modulation methods different from the above-mentioned modulation methods.

[0049] The stream reproduction unit 134C performs layer division processing, inner code error correction processing such as Viterbi decoding, energy despreading processing, stream reproduction processing, outer code error correction processing such as RS (Reed Solomon) decoding, etc. Note that the error correction processing may be a method different from the above-mentioned methods. The packet stream reproduced and output by the stream reproduction unit 134C is, for example, MPEG-2 TS, or the like. Packet streams in other formats may also be used.

[0050] FIG. 2C is a block diagram showing an example of a detailed configuration of the second tuner / demodulator 130T.

[0051] The channel selection / detection unit 131H receives a horizontally (H) polarized signal of the digital broadcast wave received by the antenna 200T and performs channel selection based on a channel selection control signal. The channel selection / detection unit 131V receives a vertically (V) polarized signal of the digital broadcast wave received by the antenna 200T and performs channel selection based on a channel selection control signal. The channel selection processing operation in the channel selection / detection unit 131H and the channel selection processing operation in the channel selection / detection unit 131V may be controlled in conjunction with each other or independently. In other words, it is possible to regard the channel selection / detection unit 131H and the channel selection / detection unit 131V as one channel selection / detection unit and control them to select one channel of a digital broadcasting service transmitted using both horizontal and vertical polarization, or it is also possible to regard the channel selection / detection unit 131H and the channel selection / detection unit 131V as two independent channel selection / detection units and control them to each select two different channels of a digital broadcasting service transmitted using only horizontal polarization (or only vertical polarization).

[0052] In addition, the horizontally (H) polarized signal and vertically (V) polarized signal received by the second tuner / demodulation unit 130T of the broadcast receiving device in each embodiment of the present invention may be polarized signals from broadcast waves whose polarization directions differ by approximately 90 degrees, and the horizontally (H) polarized signal and vertically (V) polarized signal described below and the configuration related to their reception may be reversed.

[0053] The TMCC decoding unit 132H extracts the TMCC signal from the output signal of the tuning / detection unit 131H to acquire various TMCC information. The TMCC decoding unit 132V extracts the TMCC signal from the output signal of the tuning / detection unit 131V to acquire various TMCC information. Only one of the TMCC decoding unit 132H and the TMCC decoding unit 132V may be used. The acquired TMCC information is used to control each process in the subsequent stages.

[0054] The demodulation units 133H and 133V each input a modulated wave modulated using a method such as BPSK (Binary Phase Shift Keying), DBPSK (Differential BPSK), QPSK, DQPSK, 8PSK (Phase Shift Keying), 16APSK (Amplitude and Phase Shift Keying), 32APSK, 16QAM, 64QAM, 256QAM, 1024QAM, etc., based on TMCC information, etc., and perform demodulation processing including frequency deinterleaving, time deinterleaving, carrier demapping, etc. The demodulation units 133H and 133V may also be capable of supporting modulation methods different from the above-mentioned modulation methods.

[0055] The stream reproduction unit 134H and the stream reproduction unit 134V each perform layer division processing, inner code error correction processing such as Viterbi decoding and LDPC (Low Density Parity Check) decoding, energy despreading processing, stream reproduction processing, outer code error correction processing such as RS decoding and BCH decoding, etc. Note that the error correction processing may be a method different from the above-mentioned methods. Furthermore, the packet stream reproduced and output by the stream reproduction unit 134H is, for example, an MPEG-2 TS or the like. The packet stream reproduced and output by the stream reproduction unit 134V is, for example, an MPEG-2 TS or a TLV including an MMT packet stream. Each may also be a packet stream of another format.

[0056] When the second tuner / demodulation unit 130T receives a digital broadcast wave of a single-polarized terrestrial digital broadcast, the tuning / detection unit 131V, the TMCC decoding unit 132V, and the demodulation unit 133V may not be provided. When a current terrestrial digital broadcast service and an advanced terrestrial digital broadcast service are simultaneously transmitted in different segments, of the signals output from the demodulation unit 133H, the signal of the segment transmitting the current terrestrial digital broadcast service is input to the stream reproduction unit 134H, and the signal of the segment transmitting the advanced terrestrial digital broadcast service is input to the stream reproduction unit 134V.

[0057] FIG. 2D is a block diagram showing an example of a detailed configuration of the third tuner / demodulator 130L.

[0058] The channel selection / detection unit 131L receives digital broadcast waves that have been subjected to layered division multiplexing (LDM) processing from the antenna 200L and selects a channel based on a channel selection control signal. The digital broadcast waves that have been subjected to layered division multiplexing processing may be used to transmit different digital broadcast services (or different channels of the same broadcast service) in which the modulated waves of the upper layer (UL) and the lower layer (LL) are modulated. The modulated waves of the upper layer are output to the demodulation unit 133S, and the modulated waves of the lower layer are output to the demodulation unit 133L.

[0059] The TMCC decoding unit 132L receives the modulated wave of the upper layer and the modulated wave of the lower layer output from the tuning / detection unit 131L, extracts the TMCC signal, and acquires various TMCC information. The signal input to the TMCC decoding unit 132L may be only one of the modulated wave of the upper layer and the modulated wave of the lower layer.

[0060] Demodulation units 133S and 133L operate in the same manner as demodulation units 133H and 133V, and therefore detailed descriptions thereof will be omitted. Also, stream reproduction units 134S and 134L operate in the same manner as stream reproduction units 134H and 134V, and therefore detailed descriptions thereof will be omitted. Fig. 2E is a block diagram showing an example of the detailed configuration of fourth tuner / demodulation unit 130B.

[0061] The channel selection / detection unit 131B inputs the digital broadcast waves of the advanced BS digital broadcasting service or the advanced CS digital broadcasting service received by the antenna 200B and selects a channel based on the channel selection control signal. Other operations are the same as those of the channel selection / detection unit 131H and the channel selection / detection unit 131V, so detailed descriptions thereof will be omitted. Furthermore, the TMCC decoding unit 132B, the demodulation unit 133B, and the stream reproduction unit 134B operate in the same manner as the TMCC decoding unit 132H and the TMCC decoding unit 132V, the demodulation unit 133H and the demodulation unit 133V, and the stream reproduction unit 134V, so detailed descriptions thereof will be omitted.

[0062] FIG. 2F is a block diagram showing an example of a detailed configuration of the first decoder unit 140S.

[0063] The selector 141S selects and outputs one of the packet streams input from the first tuner / demodulator 130C, the second tuner / demodulator 130T, and the third tuner / demodulator 130L under the control of the main controller 101. The packet streams input from the first tuner / demodulator 130C, the second tuner / demodulator 130T, and the third tuner / demodulator 130L are, for example, MPEG-2 TS. The CA descrambler 142S performs descrambling of the encryption algorithm of a predetermined scrambling method based on various control information related to conditional reception superimposed on the packet stream.

[0064] The demultiplexing unit 143S is a stream decoder that separates and extracts video data, audio data, superimposed text data, subtitle data, program information data, etc. based on various control information contained in the input packet stream. The separated and extracted video data is distributed to the video decoder 145S, the separated and extracted audio data to the audio decoder 146S, and the separated and extracted superimposed text data, subtitle data, program information data, etc. to the data decoder 144S. The demultiplexing unit 143S may also receive a packet stream (e.g., MPEG-2 PS, etc.) acquired from a server device on the Internet 800 via the LAN communication unit 121. The demultiplexing unit 143S can also output packet streams input from the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, and the third tuner / demodulation unit 130L to the outside via the digital interface unit 125, and can also receive packet streams acquired from the outside via the digital interface unit 125.

[0065] The video decoder 145S performs processes such as decoding compressed and encoded video information and colorimetry conversion and dynamic range conversion on the decoded video information for the video data input from the demultiplexer 143S. It also performs processes such as resolution conversion (up / down conversion) under the control of the main control unit 101, and outputs video data at resolutions such as UHD (3840 horizontal pixels x 2160 vertical pixels), HD (1920 horizontal pixels x 1080 vertical pixels), and SD (720 horizontal pixels x 480 vertical pixels) as appropriate. Video data output at other resolutions may also be performed. The audio decoder 146S performs processes such as decoding compressed and encoded audio information. It also performs downmixing under the control of the main control unit 101, and outputs audio data with a number of channels such as 22.2ch, 7.1ch, 5.1ch, or 2ch. Note that multiple video decoders 145S and audio decoders 146S may be provided to simultaneously perform multiple decoding processes of video data and audio data.

[0066] The data decoder 144S performs processes such as generating an EPG based on program information data, generating a data broadcast screen based on BML data, and controlling an integrated application based on a broadcast / communication integrated function. The data decoder 144S has a BML browser function for executing BML documents, and the data broadcast screen generation process is executed by the BML browser function. The data decoder 144S also performs processes such as decoding superimpose data to generate superimpose information and decoding subtitle data to generate subtitle information.

[0067] The superimposing units 147S, 148S, and 149S each perform superimposing processing of the video data output from the video decoder 145S and the EPG or data broadcast screen output from the data decoder 144S. The synthesizing unit 151S performs processing of synthesizing the audio data output from the audio decoder 146S and the audio data reproduced by the data decoder 144S. The selecting unit 150S selects the resolution of the video data under the control of the main control unit 101. Note that the functions of the superimposing units 147S, 148S, 149S, and selecting unit 150S may be integrated with the video selecting unit 191. The function of the synthesizing unit 151S may be integrated with the audio selecting unit 194.

[0068] FIG. 2G is a block diagram showing an example of a detailed configuration of the second decoder unit 140U.

[0069] The selector 141U, under the control of the main controller 101, selects and outputs one of the packet streams input from the second tuner / demodulator 130T, the third tuner / demodulator 130L, and the fourth tuner / demodulator 130B. The packet streams input from the second tuner / demodulator 130T, the third tuner / demodulator 130L, and the fourth tuner / demodulator 130B are, for example, MMT packet streams or TLVs containing MMT packet streams. They may also be MPEG-2 TS format packet streams that use High Efficiency Video Coding (HEVC) or similar video compression methods. The CA descrambler 142U performs decryption processing of a predetermined scrambling encryption algorithm based on various control information related to conditional access superimposed on the packet stream.

[0070] The demultiplexing unit 143U is a stream decoder that separates and extracts video data, audio data, superimposed text data, subtitle data, program information data, etc. based on various control information contained in the input packet stream. The separated and extracted video data is distributed to the video decoder 145U, the separated and extracted audio data to the audio decoder 146U, and the separated and extracted superimposed text data, subtitle data, program information data, etc. to the multimedia decoder 144U. The demultiplexing unit 143U may also receive a packet stream (e.g., an MPEG-2 PS or MMT packet stream) acquired from a server device on the Internet 800 via the LAN communication unit 121. The demultiplexing unit 143U can also output packet streams input from the second tuner / demodulation unit 130T, the third tuner / demodulation unit 130L, and the fourth tuner / demodulation unit 130B to the outside via the digital interface unit 125, and can also receive packet streams acquired from the outside via the digital interface unit 125.

[0071] The multimedia decoder 144U performs processing to generate an EPG based on program information data, processing to generate a multimedia screen based on multimedia data, processing to control an integrated application based on a broadcast / communication integrated function, etc. The multimedia decoder 144U has an HTML browser function to execute HTML documents, and the multimedia screen generation processing is executed by the HTML browser function.

[0072] Video decoder 145U, audio decoder 146U, superimposition unit 147U, superimposition unit 148U, superimposition unit 149U, synthesis unit 151U, and selection unit 150U are components that have the same functions as video decoder 145S, audio decoder 146S, superimposition unit 147S, superimposition unit 148S, superimposition unit 149S, synthesis unit 151S, and selection unit 150S, respectively. If the S at the end of the symbols in the explanation of video decoder 145S, audio decoder 146S, superimposition unit 147S, superimposition unit 148S, superimposition unit 149S, synthesis unit 151S, and selection unit 150S in Figure 2F is replaced with U, the explanation becomes video decoder 145U, audio decoder 146U, superimposition unit 147U, superimposition unit 148U, superimposition unit 149U, synthesis unit 151U, and selection unit 150U in Figure 2G, and therefore separate detailed explanation will be omitted.

[0073] [Software Configuration of Broadcast Receiving Device] Figure 2H is a software configuration diagram of broadcast receiving device 100, showing an example of the software configuration in storage (accumulation) unit 110 (or ROM 103, the same applies below) and RAM 104. Storage (accumulation) unit 110 stores a basic operation program 1001, a reception function program 1002, a browser program 1003, a content management program 1004, and other operation programs 1009. Storage (accumulation) unit 110 also includes a content storage area 1011 for storing content data such as moving images, still images, and audio, an authentication information storage area 1012 for storing authentication information used for communication and linkage with external mobile terminal devices, server devices, etc., and a various information storage area 1019 for storing various other information.

[0074] A basic operation program 1001 stored in the storage (accumulation) unit 110 is loaded into the RAM 104, and the main control unit 101 executes the loaded basic operation program to form a basic operation control unit 1101. A receiving function program 1002, a browser program 1003, and a content management program 1004 stored in the storage (accumulation) unit 110 are loaded into the RAM 104, respectively, and the main control unit 101 executes each loaded operation program to form a receiving function control unit 1102, a browser engine 1103, and a content management unit 1104. The RAM 104 also includes a temporary storage area 1200 that temporarily stores data created when each operation program is executed, as needed.

[0075] For ease of explanation, the process of controlling each operation block by the main control unit 101 expanding the basic operation program 1001 stored in the storage unit 110 into the RAM 104 and executing it will be described below as if the basic operation control unit 1101 controls each operation block. Similar descriptions will be used for the other operation programs.

[0076] The reception function control unit 1102 performs basic control of the broadcast reception function, broadcast communication cooperation function, etc. of the broadcast receiving device 100. In particular, the channel selection / demodulation unit 1102a mainly controls channel selection processing, TMCC information acquisition processing, demodulation processing, etc. in the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, the third tuner / demodulation unit 130L, the fourth tuner / demodulation unit 130B, etc. The stream playback control unit 1102b mainly controls layer division processing, error correction decoding processing, energy despreading processing, stream playback processing, etc. in the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, the third tuner / demodulation unit 130L, the fourth tuner / demodulation unit 130B, etc. The AV decoding unit 1102c mainly controls demultiplexing processing (stream decoding processing), video data decoding processing, audio data decoding processing, etc. in the first decoder unit 140S, the second decoder unit 140U, etc. The multimedia (MM) data playback unit 1102d mainly controls BML data playback processing, superimposed text data decoding processing, subtitle data decoding processing, and communication-linked app control processing in the first decoder unit 140S, and HTML data playback processing, multimedia screen generation processing, and communication-linked app control processing in the second decoder unit 140U. The EPG generation unit 1102e mainly controls EPG generation processing and display processing of the generated EPG in the first decoder unit 140S and the second decoder unit 140U. The presentation processing unit 1102f controls colorimetry conversion processing, dynamic range conversion processing, resolution conversion processing, audio downmixing processing, etc. in the first decoder unit 140S and the second decoder unit 140U, as well as controlling the video selection unit 191, audio selection unit 194, etc.

[0077] The BML browser 1103a and HTML browser 1103b of the browser engine 1103 interpret BML documents and HTML documents during the above-mentioned BML data playback process and HTML data playback process, and perform data broadcast screen generation process and multimedia screen generation process.

[0078] The content management unit 1104 performs time schedule management and execution control when recording or viewing reservations for broadcast programs, copyright management when outputting broadcast programs, recorded programs, etc. from the digital interface unit 125 or LAN communication unit 121, etc., and expiration date management of linked applications obtained based on the broadcast communication linkage function.

[0079] The operation programs may be stored in advance in the storage unit 110 and / or the ROM 103 at the time of product shipment. After product shipment, the operation programs may be acquired from a server device on the Internet 800 via the LAN communication unit 121 or the like. Furthermore, the operation programs stored on a memory card, an optical disk, or the like may be acquired via the expansion interface unit 124 or the like. The operation programs may also be newly acquired or updated via broadcast waves.

[0080] 3A shows an example of the internal configuration of the broadcast station server 400. The broadcast station server 400 is made up of a main control unit 401, a system bus 402, a RAM 404, a storage unit 410, a LAN communication unit 421, and a digital broadcast signal transmission unit 460.

[0081] The main control unit 401 is a microprocessor unit that controls the entire broadcast station server 400 in accordance with a predetermined operation program. The system bus 402 is a communication path for transmitting and receiving various data, commands, etc. between the main control unit 401 and each operation block within the broadcast station server 400. The RAM 404 serves as a work area when each operation program is executed.

[0082] The storage unit 410 stores a basic operation program 4001, a content management / distribution program 4002, and a content sending program 4003, and further includes a content data storage area 4011 and a metadata storage area 4012. The content data storage area 4011 stores content data of each broadcast program broadcast by a broadcast station. The metadata storage area 4012 stores metadata of each broadcast program, such as the program title, program ID, program summary, cast, broadcast date and time, etc.

[0083] In addition, the basic operation program 4001, content management / distribution program 4002, and content sending program 4003 stored in the storage unit 410 are each expanded into RAM 404, and the main control unit 401 executes the expanded basic operation program, content management / distribution program, and content sending program to form a basic operation control unit 4101, a content management / distribution control unit 4102, and a content sending control unit 4103.

[0084] For ease of explanation, the process of the main control unit 401 controlling each operation block by loading the basic operation program 4001 stored in the storage unit 410 onto the RAM 404 and executing it will be described below as the basic operation control unit 4101 controlling each operation block. Similar descriptions will be used for the other operation programs.

[0085] The content management / distribution control unit 4102 manages the content data, metadata, etc. stored in the content data storage area 4011 and the metadata storage area 4012, and controls the provision of the content data, metadata, etc. to the service provider based on a contract. Furthermore, the content management / distribution control unit 4102 also performs authentication processing of the service provider server 500 as necessary when providing the content data, metadata, etc. to the service provider.

[0086] The content sending control unit 4103 performs time schedule management when sending out streams including the content data of broadcast programs stored in the content data storage area 4011 and the program titles, program IDs, and copy control information of program content of broadcast programs stored in the metadata storage area 4012 via the digital broadcast signal sending unit 460.

[0087] The LAN communication unit 421 is connected to the Internet 800 and communicates with the service provider server 500 and other communication devices on the Internet 800. The LAN communication unit 421 includes an encoding circuit, a decoding circuit, etc. The digital broadcast signal transmission unit 460 performs processing such as modulation on a stream made up of content data and program information data of each broadcast program stored in the content data storage area 4011, and transmits the stream as a digital broadcast wave via the radio tower 300.

[0088] 3B shows an example of the internal configuration of the service provider server 500. The service provider server 500 is made up of a main control unit 501, a system bus 502, a RAM 504, a storage unit 510, and a LAN communication unit 521.

[0089] The main control unit 501 is a microprocessor unit that controls the entire service provider server 500 in accordance with a predetermined operation program. The system bus 502 is a communication path for transmitting and receiving various data, commands, etc. between the main control unit 501 and each operation block in the service provider server 500. The RAM 504 serves as a work area when each operation program is executed.

[0090] The storage unit 510 stores a basic operation program 5001, a content management / distribution program 5002, and an application management / distribution program 5003, and further includes a content data storage area 5011, a metadata storage area 5012, and an application storage area 5013. The content data storage area 5011 and the metadata storage area 5012 store content data, metadata, etc. provided by the broadcast station server 400, or content created by service providers and metadata related to the content. The application storage area 5013 stores applications (operating programs and / or various data, etc.) required to realize each service of the broadcasting / communication cooperation system, which are distributed in response to requests from each television receiver.

[0091] In addition, the basic operation program 5001, content management / distribution program 5002, and application management / distribution program 5003 stored in the storage unit 510 are each expanded into RAM 504, and the main control unit 501 executes the expanded basic operation program, content management / distribution program, and application management / distribution program to form a basic operation control unit 5101, a content management / distribution control unit 5102, and an application management / distribution control unit 5103.

[0092] For ease of explanation, the process of the main control unit 501 controlling each operation block by loading the basic operation program 5001 stored in the storage unit 510 onto the RAM 504 and executing it will be described below as the basic operation control unit 5101 controlling each operation block. Similar descriptions will be used for the other operation programs.

[0093] The content management / distribution control unit 5102 acquires content data, metadata, etc. from the broadcast station server 400, manages the content data, metadata, etc. stored in the content data storage area 5011 and the metadata storage area 5012, and controls the distribution of the content data, metadata, etc. to each television receiver. The application management / distribution control unit 5103 manages each application stored in the application storage area 5013 and controls the distribution of each application in response to a request from each television receiver. Furthermore, when distributing each application to each television receiver, the application management / distribution control unit 5103 also performs authentication processing of the television receiver as necessary.

[0094] The LAN communication unit 521 is connected to the Internet 800 and communicates with the broadcast station server 400 and other communication devices on the Internet 800. It also communicates with the broadcast receiving device 100 and the mobile information terminal 700 via the router device 800R. The LAN communication unit 521 includes an encoding circuit, a decoding circuit, etc.

[0095] 3C is a block diagram showing an example of the internal configuration of the portable information terminal 700. The portable information terminal 700 is composed of a main control unit 701, a system bus 702, a ROM 703, a RAM 704, a storage unit 710, a communication processing unit 720, an expansion interface unit 724, an operation unit 730, an image processing unit 740, an audio processing unit 750, and a sensor unit 760.

[0096] The main control unit 701 is a microprocessor unit that controls the entire portable information terminal 700 in accordance with a predetermined operation program. The system bus 702 is a communication path for transmitting and receiving various data, commands, etc. between the main control unit 701 and each operation block within the portable information terminal 700.

[0097] The ROM 703 is a non-volatile memory that stores basic operation programs such as an operating system and other operation programs, and may be a rewritable ROM such as an EEPROM or flash ROM. The ROM 703 also stores operation setting values ​​and the like required for the operation of the portable information terminal 700. The RAM 704 serves as a work area when the basic operation programs and other operation programs are executed. The ROM 703 and the RAM 704 may be integrated with the main control unit 701. The ROM 703 may not be an independent configuration as shown in FIG. 3C , but may use a partial storage area within the storage unit 710.

[0098] The storage unit 710 stores the operation programs and operation setting values ​​of the portable information terminal 700, personal information of the user of the portable information terminal 700, etc. It can also store operation programs downloaded via the Internet 800 and various data created by the operation programs. It can also store content such as videos, still images, and audio downloaded via the Internet 800. A portion of the storage unit 710 may replace all or part of the functions of the ROM 703. Furthermore, the storage unit 710 needs to retain the stored information even when power is not being supplied to the portable information terminal 700 from an external source. Therefore, for example, devices such as semiconductor element memories such as flash ROMs and SSDs, and magnetic disk drives such as HDDs are used.

[0099] The operation programs stored in the ROM 703 and storage unit 710 can be added, updated, and have their functions expanded by downloading them from each server device on the Internet 800 .

[0100] The communication processing unit 720 is composed of a LAN communication unit 721, a mobile telephone network communication unit 722, and an NFC communication unit 723. The LAN communication unit 721 is connected to the Internet 800 via a router device 800R and transmits and receives data to and from each server device and other communication devices on the Internet 800. The connection to the router device 800R is made wirelessly via a Wi-Fi (registered trademark) or other connection. The mobile telephone network communication unit 722 performs telephone communication (calls) and data transmission and reception via wireless communication with a base station 600B of the mobile telephone network. The NFC communication unit 723 performs wireless communication when in close proximity to a corresponding reader / writer. The LAN communication unit 721, the mobile telephone network communication unit 722, and the NFC communication unit 723 each include an encoding circuit, a decoding circuit, an antenna, etc. The communication processing unit 720 may also include other communication units, such as a Bluetooth (registered trademark) communication unit or an infrared communication unit.

[0101] The expansion interface unit 724 is a group of interfaces for expanding the functions of the portable information terminal 700, and in this embodiment, is configured with a video / audio interface, a USB interface, a memory interface, etc. The video / audio interface inputs video signals / audio signals from external video / audio output devices, outputs video signals / audio signals to external video / audio input devices, etc. The USB interface connects to a PC or the like to send and receive data. It may also be used to connect a keyboard or other USB devices. The memory interface connects to a memory card or other memory medium to send and receive data.

[0102] The operation unit 730 is an instruction input unit that inputs operation instructions to the mobile information terminal 700, and in this embodiment is composed of a touch panel 730T arranged on top of the display unit 741 and an operation key 730K with an array of button switches. Only one of these may be used. The mobile information terminal 700 may be operated using a keyboard or the like connected to the expansion interface unit 724. The mobile information terminal 700 may be operated using a separate terminal device connected by wired or wireless communication. In other words, the mobile information terminal 700 may be operated from the broadcast receiving device 100. The touch panel function may also be provided in the display unit 741.

[0103] The image processing unit 740 is composed of a display unit 741, an image signal processing unit 742, a first image input unit 743, and a second image input unit 744. The display unit 741 is a display device such as a liquid crystal panel, and provides image data processed by the image signal processing unit 742 to the user of the portable information terminal 700. The image signal processing unit 742 is equipped with a video RAM (not shown), and the display unit 741 is driven based on image data input to the video RAM. The image signal processing unit 742 also has functions such as format conversion and superimposition processing of menus and other OSD (On Screen Display) signals as necessary. The first image input unit 743 and the second image input unit 744 are camera units that input image data of the surroundings or an object by converting light input from a lens into an electrical signal using electronic devices such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) sensor.

[0104] The audio processing unit 750 is composed of an audio output unit 751, an audio signal processing unit 752, and an audio input unit 753. The audio output unit 751 is a speaker, and provides an audio signal processed by the audio signal processing unit 752 to the user of the mobile information terminal 700. The audio input unit 753 is a microphone, and converts the user's voice, etc. into audio data and inputs it.

[0105] The sensor unit 760 is a group of sensors for detecting the state of the portable information terminal 700, and in this embodiment, is composed of a GPS receiver unit 761, a gyro sensor 762, a geomagnetic sensor 763, an acceleration sensor 764, an illuminance sensor 765, and a proximity sensor 766. These sensors make it possible to detect the position, inclination, direction, and movement of the portable information terminal 700, as well as the ambient brightness and the proximity of surrounding objects. The portable information terminal 700 may further include other sensors, such as a barometric pressure sensor.

[0106] The portable information terminal 700 may be a mobile phone, a smartphone, a tablet terminal, etc. It may also be a PDA (Personal Digital Assistant) or a notebook PC. It may also be a digital still camera, a video camera capable of shooting video, a portable game console, a navigation device, or any other portable digital device.

[0107] 3C includes many components that are not essential to this embodiment, such as a sensor unit 760, but the effects of this embodiment are not impaired even if these components are not provided. Furthermore, components not shown, such as a digital broadcast receiving function and an electronic money payment function, may be further added.

[0108] 3D is a software configuration diagram of the portable information terminal 700, showing an example of the software configuration in the ROM 703, RAM 704, and storage unit 710. A basic operation program 7001 and other operation programs are stored in the ROM 703. A linkage control program 7002 and other operation programs are stored in the storage unit 710. The storage unit 710 also includes a content storage area 7200 for storing content data such as moving images, still images, and audio, an authentication information storage area 7300 for storing authentication information and the like required when accessing the television receiver and each server device, and various information storage areas for storing various other information.

[0109] The basic operation program 7001 stored in the ROM 703 is loaded into the RAM 704, and the main control unit 701 executes the loaded basic operation program to form a basic operation execution unit 7101. Similarly, the cooperative control program 7002 stored in the storage unit 710 is loaded into the RAM 704, and the main control unit 701 executes the loaded cooperative control program to form a cooperative control execution unit 7102. The RAM 704 also includes a temporary storage area for temporarily storing data created when each operation program is executed, as needed.

[0110] For ease of explanation, the process of controlling each operation block by the main control unit 701 loading the basic operation program 7001 stored in the ROM 703 into the RAM 704 and executing it will be described below as if the basic operation execution unit 7101 controls each operation block. Similar descriptions will be used for the other operation programs.

[0111] The cooperative control execution unit 7102 manages device authentication and connection, transmission and reception of data, etc. when the mobile information terminal 700 performs cooperative operation with the television receiver. The cooperative control execution unit 7102 also has a browser engine function for executing applications that work in conjunction with the television receiver.

[0112] The operation programs may be stored in advance in the ROM 703 and / or the storage unit 710 at the time of product shipment. After product shipment, the operation programs may be acquired from a server device on the Internet 800 via the LAN communication unit 721 or the mobile telephone network communication unit 722. Alternatively, the operation programs may be stored on a memory card, an optical disk, or the like and acquired via the expansion interface unit 724 or the like.

[0113] [Digital Broadcast Waves] Here, an example of digital broadcast waves received by the broadcast receiving device according to the embodiment of the present invention will be described.

[0114] The broadcast receiving device 100 is capable of receiving terrestrial digital broadcasting services that share at least some specifications with the ISDB-T (Integrated Services Digital Broadcasting for Terrestrial Television Broadcasting) system. Specifically, dual-polarized terrestrial digital broadcasting and single-polarized terrestrial digital broadcasting, which the second tuner / demodulator 130T can receive, are advanced terrestrial digital broadcasting that share some specifications with the ISDB-T system. Furthermore, hierarchical division multiplexed terrestrial digital broadcasting, which the third tuner / demodulator 130L can receive, is advanced terrestrial digital broadcasting that shares some specifications with the ISDB-T system. The current terrestrial digital broadcasting that the first tuner / demodulator 130C can receive is terrestrial digital broadcasting based on the ISDB-T system. Further, the advanced BS digital broadcasting and advanced CS digital broadcasting that can be received by the fourth tuner / demodulation unit 130B are digital broadcasting that differs from the ISDB-T system.

[0115] Here, the dual-polarized terrestrial digital broadcasting, single-polarized terrestrial digital broadcasting, and hierarchical division multiplexed terrestrial digital broadcasting according to this embodiment employ, as in the ISDB-T system, OFDM (Orthogonal Frequency Division Multiplexing), a multi-carrier system, as a transmission system. Because OFDM is a multi-carrier system, the symbol length is long, and it is effective to add a redundant portion in the time axis direction called a guard interval, which can reduce the effects of multipath within the range of the guard interval. This makes it possible to realize a SFN (Single Frequency Network), enabling effective use of frequencies.

[0116] In the dual-polarized terrestrial digital broadcasting, single-polarized terrestrial digital broadcasting, and hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment, the OFDM carriers are divided into groups called segments, similar to the ISDB-T system. As shown in FIG. 4A, one channel bandwidth of a digital broadcasting service consists of 13 segments. The center of the bandwidth is designated as segment 0, with segment numbers (0 to 12) assigned sequentially above and below this. Transmission path coding for the dual-polarized terrestrial digital broadcasting, single-polarized terrestrial digital broadcasting, and hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment is performed in units of OFDM segments. This makes it possible to define hierarchical transmission. For example, within the bandwidth of one television channel, some OFDM segments can be assigned to fixed reception services and the remaining segments to mobile reception services. In hierarchical transmission, each layer consists of one or more OFDM segments, and parameters such as the carrier modulation method, inner code coding rate, and time interleaving length can be set for each layer. The number of layers can be set arbitrarily, for example, up to three layers. Figure 4B shows an example of hierarchical allocation of OFDM segments when the number of hierarchical layers is 3 or 2. In the example of Figure 4B(1), the number of hierarchical layers is 3, with hierarchical layer A consisting of 1 segment (segment 0), hierarchical layer B consisting of 7 segments (segments 1 to 7), and hierarchical layer C consisting of 5 segments (segments 8 to 12). In the example of Figure 4B(2), the number of hierarchical layers is 3, with hierarchical layer A consisting of 1 segment (segment 0), hierarchical layer B consisting of 5 segments (segments 1 to 5), and hierarchical layer C consisting of 7 segments (segments 6 to 12). In the example of Figure 4B(3), the number of hierarchical layers is 2, with hierarchical layer A consisting of 1 segment (segment 0), and hierarchical layer B consisting of 12 segments (segments 1 to 12). The number of OFDM segments in each layer, transmission path coding parameters, etc. are determined according to organization information and transmitted by a TMCC signal, which is control information for assisting the operation of the receiver.

[0117] Note that the following may be an example of the use of segment hierarchical allocations (1), (2), and (3) in FIG. 4B.

[0118] For example, the hierarchical allocation of Figure 4B (1) can be used in the dual-polarized terrestrial digital broadcasting according to this embodiment, and the same segment hierarchical allocation can be used for both horizontally polarized waves and vertically polarized waves. Specifically, the current terrestrial digital broadcasting mobile reception service can be transmitted using the one horizontally polarized wave segment as hierarchical layer A. (Note that the same current terrestrial digital broadcasting mobile reception service can also be transmitted using the one vertically polarized wave segment. In this case, this is also treated as hierarchical layer A.) Furthermore, the current terrestrial digital broadcasting service, which transmits video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels, can be transmitted using the seven horizontally polarized wave segments as hierarchical layer B. (Note that a terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels may transmit the same service using the above seven vertically polarized segments. In this case, this is also treated as tier B.) Furthermore, tier C may be configured to transmit an advanced terrestrial digital broadcasting service that can transmit video with a maximum resolution of more than 1920 horizontal pixels x 1080 vertical pixels using the above five segments of both horizontally polarized and vertically polarized waves, for a total of 10 segments. Details of this transmission will be described later. The transmission wave with this segment tier allocation can be received, for example, by the second tuner / demodulation unit 130T of the broadcast receiving device 100.

[0119] The hierarchical allocation of FIG. 4B(1) can also be used in the single-polarized terrestrial digital broadcasting according to this embodiment. Specifically, the one segment of layer A can transmit the current terrestrial digital broadcasting mobile reception service. The seven segments of layer B can transmit the terrestrial digital broadcasting service, which transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels, which is the current terrestrial digital broadcasting service. Furthermore, the five segments of layer C can be configured to transmit an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels by 1080 vertical pixels. In this case, layer C uses a carrier modulation method, error correction code method, video encoding method, etc. that are more efficient than those used in current terrestrial digital broadcasting. Details of this transmission will be described later. The transmission wave of this segment hierarchical allocation can be received, for example, by the second tuner / demodulator 130T of the broadcast receiving device 100.

[0120] As an example not shown, in the single-polarized terrestrial digital broadcasting according to this embodiment, one segment of layer A may be used to transmit a current terrestrial digital broadcasting mobile reception service, eight segments of layer B may be used to transmit a terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels, which is the current terrestrial digital broadcasting standard, and four segments of layer C may be used to transmit an advanced terrestrial digital broadcasting service that can transmit video with a maximum resolution exceeding 1920 horizontal pixels by 1080 vertical pixels. Note that in this case, layer C also uses a carrier modulation method, error correction code method, video encoding method, etc. that are more efficient than those used in current terrestrial digital broadcasting. Details of this transmission will be described later. The transmission wave assigned to this segment layer can be received, for example, by the second tuner / demodulator 130T of the broadcast receiving device 100.

[0121] For example, the hierarchical allocation of Figure 4B(2) can be used as an example different from Figure 4B(1) in the dual-polarized terrestrial digital broadcasting according to this embodiment, and the same segment hierarchical allocation can be used for both horizontally polarized and vertically polarized waves. Specifically, the current terrestrial digital broadcasting mobile reception service can be transmitted using the one horizontally polarized segment as hierarchical layer A. (Note that the same current terrestrial digital broadcasting mobile reception service can also be transmitted using the one vertically polarized segment. In this case, this is also treated as hierarchical layer A.) Furthermore, the five horizontally polarized and vertically polarized segments, totaling 10 segments, can be used as hierarchical layer B to transmit an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels x 1080 vertical pixels. Furthermore, the seven horizontally polarized segments can be used as hierarchical layer C to transmit the current terrestrial digital broadcasting service, which transmits video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels. (Note that a terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically may transmit the same service using the above seven segments of vertical polarization. In this case, this is also treated as hierarchical layer C.) Details of this transmission will be described later. The transmission wave with this segment hierarchical layer allocation can be received, for example, by the second tuner / demodulator 130T of the broadcast receiving device 100 of this embodiment.

[0122] Furthermore, the hierarchical allocation of FIG. 4B(2) can be used as an example different from FIG. 4B(1) in the single-polarized terrestrial digital broadcasting according to this embodiment. Specifically, the one segment above may be used as hierarchical A to transmit the current terrestrial digital broadcasting mobile reception service. Furthermore, the five segments above may be used as hierarchical B to transmit an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels by 1080 vertical pixels. In this case, hierarchical B uses a carrier modulation method, error correction code method, video encoding method, etc. that are more efficient than those used in current terrestrial digital broadcasting. Furthermore, the seven segments above may be used as hierarchical C to transmit the current terrestrial digital broadcasting service, which transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels. Details of this transmission will be described later. The transmission wave of this segment hierarchical allocation can be received, for example, by the second tuner / demodulator 130T of the broadcast receiving device 100 according to this embodiment.

[0123] For example, the hierarchical allocation of FIG. 4B (3) can be used in the hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment or in current terrestrial digital broadcasting. Specifically, when used in hierarchical division multiplexing terrestrial digital broadcasting, the one segment in the figure can be used as hierarchical layer A to transmit the current terrestrial digital broadcasting mobile reception service. Furthermore, the 12 segments in the figure can be used as hierarchical layer B to transmit an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 pixels horizontally by 1080 pixels vertically, or a current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically. The transmission wave of this segment hierarchical allocation can be received, for example, by the third tuner / demodulator 130L of the broadcast receiving device 100 of this embodiment. When used in current terrestrial digital broadcasting, it is sufficient to transmit the current terrestrial digital broadcasting mobile reception service in one segment in the figure as tier A, and to transmit the current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically in 12 segments in the figure as tier B. The transmission wave of this segment tier allocation can be received, for example, by the first tuner / demodulator 130C of the broadcast receiving device 100 of this embodiment.

[0124] FIG. 4C shows an example of a broadcasting station system that generates and processes OFDM transmission waves, which are digital broadcast waves for dual-polarized terrestrial digital broadcasting, single-polarized terrestrial digital broadcasting, and hierarchical division multiplexed terrestrial digital broadcasting according to this embodiment. An information source encoder 411 encodes video, audio, various data, etc. A multiplexer / conditional access processor 415 multiplexes the video, audio, various data, etc. encoded by the information source encoder 411, performs appropriate processing for conditional access, and outputs the result as a packet stream. Multiple information source encoders 411 and multiplexers / conditional access processors 415 can be configured in parallel to generate multiple packet streams. A transmission path encoder 416 remultiplexes the multiple packet streams into a single packet stream, performs transmission path encoding, and outputs the result as an OFDM transmission wave. The configuration shown in FIG. 4C is common to the ISDB-T system in terms of the configuration for generating OFDM transmission waves, although the details of the information source encoding and transmission path encoding methods differ. Therefore, some of the multiple information source encoders 411 and multiplexers / conditional access processors 415 may be configured for ISDB-T terrestrial digital broadcasting services and some may be configured for advanced terrestrial digital broadcasting services, and packet streams of multiple different terrestrial digital broadcasting services may be multiplexed by transmission path encoder 416. When multiplexer / conditional access processor 415 is configured for ISDB-T terrestrial digital broadcasting services, it is sufficient to generate an MPEG-2TS, which is a TSP (Transport Stream Packet) stream defined by MPEG-2 Systems. Also, when multiplexer / conditional access processor 415 is configured for advanced terrestrial digital broadcasting services, it is sufficient to generate an MMT packet stream or a TLV stream including MMT packets, or a TSP stream defined in other systems. Naturally, all of the multiple information source coding units 411 and multiplexing units / limited reception processing units 415 may be configured for advanced terrestrial digital broadcasting services, and all packet streams multiplexed by the transmission path coding unit 416 may be packet streams for advanced terrestrial digital broadcasting services.

[0125] FIG. 4D shows an example of the configuration of the transmission path coding unit 416.

[0126] First, FIG. 4D(1) will be described. FIG. 4D(1) shows the configuration of the transmission path coding unit 416 when generating only OFDM transmission waves for digital broadcasting of the current terrestrial digital broadcasting service. The OFDM transmission waves transmitted in this configuration have, for example, the segment configuration shown in FIG. 4B(3). The packet stream input from the multiplexing unit / conditional access processing unit 415 and subjected to re-multiplexing processing is subjected to various interleaving processes such as byte interleaving, bit interleaving, time interleaving, and frequency interleaving in addition to adding redundancy for error correction. Then, the packet stream is processed by IFFT (Inverse Fast Fourier Transform) together with the pilot signal, TMCC signal, and AC signal, and after a guard interval is added, it is subjected to orthogonal modulation to become an OFDM transmission wave. The outer code processing, power dispersal processing, byte interleaving, inner code processing, bit interleaving, and mapping processing are configured to be processed separately for each layer, such as layer A and layer B. (Note that while current terrestrial digital broadcasting services operate with two layers of digital broadcasting, transmission up to three layers is possible, and therefore, Figure 4D(1) shows an example of three layers.) The mapping process is a carrier modulation process. Furthermore, the packet stream input from the multiplexing unit / conditional access processing unit 415 may be multiplexed with information such as TMCC information, mode, and guard interval ratio. Note that, as mentioned above, the packet stream input to the transmission path coding unit 416 may be a TSP stream defined by MPEG-2 Systems. The OFDM transmission wave generated by the configuration of Figure 4D(1) can be received, for example, by the first tuner / demodulation unit 130C of the broadcast receiving device 100 of this embodiment.

[0127] Next, FIG. 4D(2) will be described. FIG. 4D(2) shows the configuration of the transmission path coding unit 416 when generating OFDM transmission waves for dual-polarized terrestrial digital broadcasting according to this embodiment. The OFDM transmission waves transmitted in this configuration have, for example, the segment configuration of FIG. 4B(1) or (2). In FIG. 4D(2) as well, the packet stream input from the multiplexing unit / conditional access processing unit 415 and subjected to re-multiplexing processing is subjected to various interleaving processes such as byte interleaving, bit interleaving, time interleaving, and frequency interleaving in addition to adding redundancy for error correction. Thereafter, the packet stream is subjected to IFFT processing together with the pilot signal, TMCC signal, and AC signal, and after being subjected to guard interval addition processing, is subjected to orthogonal modulation to become an OFDM transmission wave.

[0128] In the configuration example of Figure 4D(2), outer code processing, power dispersal processing, byte interleaving, inner code processing, bit interleaving, mapping processing, and time interleaving are configured so that they can be processed separately for each layer, such as layer A, layer B, and layer C. However, in the configuration example of Figure 4D(2), not only horizontally polarized (H) OFDM transmission waves but also vertically polarized (V) OFDM transmission waves are generated, and the processing flow branches into two systems. When branching from the horizontally polarized (H) processing system to the vertically polarized (V) processing system, whether the same data as in the horizontally polarized (H) processing system is branched to the vertically polarized (V) processing system, data different from the horizontally polarized (H) processing system is branched to the vertically polarized (V) processing system, or no data is branched to the vertically polarized (V) processing system can be made different for each layer, corresponding to the segment configuration described in Figure 4B(1) or (2).

[0129] The processing of outer codes, inner codes, mapping, etc. shown in the configuration of Figure 4D(2) can use processing compatible with the configuration of Figure 4D(1), as well as more advanced processing not adopted in the processing of the configuration of Figure 4D(1). Specifically, for the part of the configuration of Figure 4D(2) where processing is performed for each layer, in layers where current terrestrial digital broadcasting mobile reception services and current terrestrial digital broadcasting services that transmit video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically are transmitted, processing of outer codes, inner codes, mapping, etc. is performed that is compatible with the configuration of Figure 4D(1). On the other hand, for the part of the configuration of Figure 4D(2) where processing is performed for each layer, in layers where advanced terrestrial digital broadcasting services that can transmit video with a maximum resolution of more than 1920 pixels horizontally by 1080 pixels vertically are transmitted, processing of outer codes, inner codes, mapping, etc. can be configured to use more advanced processing not adopted in the processing of the configuration of Figure 4D(1).

[0130] In addition, in the dual-polarized terrestrial digital broadcasting according to this embodiment, the allocation of the hierarchical layers and the terrestrial digital broadcasting services to be transmitted can be switched using the TMCC information described later, so it is desirable to configure the processing such as the outer code, inner code, mapping, etc. applied to each layer to be switchable using the TMCC information.

[0131] For layers transmitting advanced terrestrial digital broadcasting services capable of transmitting video with a maximum resolution exceeding 1920 pixels horizontally by 1080 pixels vertically, byte interleaving, bit interleaving, and time interleaving may be performed in a manner compatible with current terrestrial digital broadcasting services, or more advanced different processing may be performed. Alternatively, for layers transmitting advanced terrestrial digital broadcasting services, some interleaving may be omitted.

[0132] Furthermore, in the configuration of Figure 4D (2), the input stream that serves as the source of the layer transmitting the current terrestrial digital broadcasting mobile reception service or the current terrestrial digital broadcasting service transmitting video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels may be a TSP stream defined by MPEG-2 Systems, which is currently used in terrestrial digital broadcasting, among the packet streams input to the transmission path coding unit 416. The input stream that serves as the source of the layer transmitting the advanced terrestrial digital broadcasting service in the configuration of Figure 4D (2) may be a stream defined by a system other than the TSP stream defined by MPEG-2 Systems, such as an MMT packet stream or a TLV including an MMT packet, among the packet streams input to the transmission path coding unit 416. However, it is also acceptable to adopt a TSP stream defined by MPEG-2 Systems in the advanced terrestrial digital broadcasting service.

[0133] In the configuration of Fig. 4D(2) described above, until an OFDM transmission wave is generated from an input stream, a stream format and processing compatible with current terrestrial digital broadcasting are maintained in layers where current terrestrial digital broadcasting mobile reception services and current terrestrial digital broadcasting services that transmit video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels are transmitted. As a result, even when a receiving device for an existing current terrestrial digital broadcasting service receives either a horizontally polarized OFDM transmission wave or a vertically polarized OFDM transmission wave generated in the configuration of Fig. 4D(2), it is possible to correctly receive and demodulate the broadcast signal of the terrestrial digital broadcasting service in layers where current terrestrial digital broadcasting mobile reception services and current terrestrial digital broadcasting services that transmit video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels are transmitted.

[0134] Furthermore, in the configuration of Figure 4D (2), in a hierarchy that uses segments of both horizontally polarized OFDM transmission waves and vertically polarized OFDM transmission waves, it is possible to transmit an advanced terrestrial digital broadcasting service that can transmit video with a maximum resolution of more than 1920 pixels horizontally by 1080 pixels vertically, and the broadcast signal of this advanced terrestrial digital broadcasting service can be received and demodulated by the broadcast receiving device 100 according to an embodiment of the present invention.

[0135] In other words, the configuration of Figure 4D (2) can generate digital broadcast waves that can be suitably received and demodulated by broadcast receiving devices compatible with advanced terrestrial digital broadcasting services, as well as by receiving devices for existing terrestrial digital broadcasting services.

[0136] In addition, when generating an OFDM transmission wave for single-polarized terrestrial digital broadcasting according to this embodiment, the transmission path coding unit 416 shown in Fig. 4D (2) may be configured with only one of a system for generating a horizontally polarized (H) OFDM transmission wave or a system for generating a vertically polarized (V) OFDM transmission wave. In this case, the OFDM transmission wave transmitted by this configuration also has the segment configuration shown in Fig. 4B (1) or (2), for example. However, unlike the case where the OFDM transmission wave for dual-polarized terrestrial digital broadcasting described above is generated, only one of a horizontally polarized OFDM transmission wave or a vertically polarized OFDM transmission wave is transmitted. The other configurations and operations are the same as those when generating an OFDM transmission wave for dual-polarized terrestrial digital broadcasting described above.

[0137] Next, Fig. 4D(3) will be described. Fig. 4D(3) shows the configuration of the transmission path coding unit 416 when generating an OFDM transmission wave for hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment. In Fig. 4D(3) as well, the packet stream input from the multiplexing unit / conditional access processing unit 415 and subjected to re-multiplexing processing is subjected to various interleaving processes such as byte interleaving, bit interleaving, time interleaving, and frequency interleaving in addition to being subjected to error correction redundancy. Thereafter, the packet stream is subjected to IFFT processing together with the pilot signal, TMCC signal, and AC signal, and after a guard interval is added, it is subjected to orthogonal modulation to become an OFDM transmission wave.

[0138] However, in the configuration of Figure 4D(3), modulated waves transmitted in the upper layer and modulated waves transmitted in the lower layer are generated separately, multiplexed, and then an OFDM transmission wave, which is a digital broadcast wave, is generated. The processing system shown at the top of the configuration of Figure 4D(3) is a processing system for generating modulated waves transmitted in the upper layer, and the processing system shown at the bottom is a processing system for generating modulated waves transmitted in the lower layer. The data transmitted through the processing system for generating modulated waves transmitted in the upper layer of Figure 4D(3) is current terrestrial digital broadcasting mobile reception services and current terrestrial digital broadcasting services that transmit video with a maximum resolution of 1920 pixels horizontally x 1080 pixels vertically, and the various processes in the processing system for generating modulated waves transmitted in the upper layer of Figure 4D(3) are the same as or compatible with the various processes in Figure 4D(1). The modulated waves transmitted in the upper layer of Figure 4D(3) have, for example, the segment configuration of Figure 4B(3), similar to the transmission wave of Figure 4D(1). Therefore, the modulated waves transmitted in the upper layers of Fig. 4D(3) are digital broadcast waves that are compatible with current terrestrial digital broadcast mobile reception services and current terrestrial digital broadcast services that transmit video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels. In contrast, the data transmitted through the processing system for generating the modulated waves transmitted in the lower layers of Fig. 4D(3) is an advanced terrestrial digital broadcast service that can transmit video with a maximum resolution of more than 1920 horizontal pixels x 1080 vertical pixels, and can be configured to use more advanced processing than is employed in the processing of the configuration of Fig. 4D(1), for example, for outer coding, inner coding, mapping, etc.

[0139] The modulated wave transmitted on the lower hierarchical layer of Figure 4D(3) may be, for example, assigned to an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels x 1080 vertical pixels, with all 13 segments assigned to hierarchical layer A. Alternatively, the segment configuration of Figure 4B(3) may be used, with one segment of hierarchical layer A transmitting a current terrestrial digital broadcasting mobile reception service, and the 12-segment hierarchical layer B transmitting an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels x 1080 vertical pixels. In the latter case, as in Figure 4D(2), it is sufficient to configure the system so that processing from outer coding processing to time interleaving processing can be switched between hierarchical layers such as hierarchical layer A and hierarchical layer B. As in the description of Figure 4D(2), the hierarchical layer transmitting the current terrestrial digital broadcasting mobile reception service must maintain processing compatible with current terrestrial digital broadcasting.

[0140] In the configuration of Figure 4D (3), an OFDM transmission wave is generated, which is a terrestrial digital broadcast wave obtained by multiplexing a modulated wave transmitted in an upper layer and a modulated wave transmitted in a lower layer. Technology for separating the modulated wave transmitted in the upper layer from the OFDM transmission wave is also implemented in existing receivers for terrestrial digital broadcast services. Therefore, broadcast signals included in the modulated wave transmitted in the upper layer for current terrestrial digital broadcast mobile reception services and current terrestrial digital broadcast services that transmit video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels can be correctly received and demodulated by existing receivers for terrestrial digital broadcast services. In contrast, broadcast signals included in the modulated wave transmitted in the lower layer for advanced terrestrial digital broadcast services that can transmit video with a maximum resolution exceeding 1920 horizontal pixels x 1080 vertical pixels can be received and demodulated by the broadcast receiver 100 according to an embodiment of the present invention.

[0141] That is, the configuration of Fig. 4D(3) can generate digital broadcast waves that can be suitably received and demodulated by broadcast receiving devices compatible with advanced terrestrial digital broadcasting services as well as by receiving devices for existing terrestrial digital broadcasting services. Also, unlike the configuration of Fig. 4D(2), the configuration of Fig. 4D(3) does not require the use of multiple polarized waves, and can generate OFDM transmission waves that can be received more easily.

[0142] In the OFDM transmission wave generation process shown in Figures 4D(1), 4D(2), and 4D(3) of this embodiment, three modes with different numbers of carriers are prepared, taking into consideration factors such as adaptability to the distance between SFN stations and resistance to Doppler shift in mobile reception. It is also possible to prepare additional modes with different numbers of carriers. In modes with a larger number of carriers, the effective symbol length is longer, and for the same guard interval ratio (guard interval length / effective symbol length), the guard interval length is longer, making it possible to provide resistance to multipath with long delay time differences. On the other hand, in modes with a smaller number of carriers, the carrier spacing is wider, making it possible to reduce the impact of inter-carrier interference due to Doppler shift that occurs in mobile reception, etc.

[0143] In the OFDM transmission wave generation process shown in Figures 4D(1), 4D(2), and 4D(3) of this embodiment, parameters such as the carrier modulation method, the coding rate of the inner code, and the time interleaving length can be set for each layer consisting of one or more OFDM segments. Figure 4E shows an example of transmission parameters for each OFDM segment identified by the system mode of this embodiment. Note that the carrier modulation method in the figure refers to the modulation method of the "data" carrier. The SP signal, CP signal, TMCC signal, and AC signal employ a modulation method different from the modulation method of the "data" carrier. Since these signals are signals for which noise resistance is more important than information volume, a modulation method is employed that maps to a small-value constellation (BPSK or DBPSK, i.e., two states) with fewer states than the modulation method of the "data" carrier (both QPSK or higher, i.e., four or more states), thereby improving noise resistance.

[0144] Furthermore, for the carrier number, the values ​​to the left of the diagonal line represent the values ​​when QPSK, 16QAM, 64QAM, etc. are set as the carrier modulation method, and the values ​​to the right of the diagonal line represent the values ​​when DQPSK is set as the carrier modulation method. In the figure, underlined parameters are parameters that are incompatible with the current terrestrial digital broadcasting mobile reception service. Specifically, the "data" carrier modulation methods of 256QAM, 1024QAM, and 4096QAM are not adopted in the current terrestrial digital broadcasting service. Therefore, in the processing at the layer that requires compatibility with the current terrestrial digital broadcasting service in the OFDM broadcast wave generation processing according to Figures 4D(1), 4D(2), and 4D(3) of this embodiment, the "data" carrier modulation methods of 256QAM, 1024QAM, and 4096QAM are not used. For "data" carriers transmitted at a layer corresponding to advanced terrestrial digital broadcasting services, in addition to modulation methods such as QPSK (4 states), 16QAM (16 states), and 64QAM (64 states) that are compatible with current terrestrial digital broadcasting services, it is also possible to apply even more multi-value modulation methods such as 256QAM (256 states), 1024QAM (1024 states), and 4096QAM (4096 states). It is also possible to adopt modulation methods different from these modulation methods.

[0145] The modulation method for pilot symbol (SP and CP) carriers may be BPSK (2 states), which is compatible with current terrestrial digital broadcasting services. The modulation method for AC carriers and TMCC carriers may be DBPSK (2 states), which is also compatible with current terrestrial digital broadcasting services.

[0146] In addition, LDPC codes are not adopted as an inner code processing method in current terrestrial digital broadcasting services. Therefore, LDPC codes are not used in the processing at layers that require compatibility with current terrestrial digital broadcasting services in the OFDM broadcast wave generation processing according to Figures 4D(1), 4D(2), and 4D(3) of this embodiment. LDPC codes may be applied as inner codes to data transmitted at layers corresponding to advanced terrestrial digital broadcasting services. In addition, BCH codes are not adopted as an outer code processing method in current terrestrial digital broadcasting services. Therefore, BCH codes are not used in the processing at layers that require compatibility with current terrestrial digital broadcasting services in the OFDM broadcast wave generation processing according to Figures 4D(1), 4D(2), and 4D(3) of this embodiment. BCH codes may be applied as outer codes to data transmitted at layers corresponding to advanced terrestrial digital broadcasting services.

[0147] FIG. 4F also shows an example of transmission signal parameters for each physical channel (6 MHz bandwidth) in the OFDM broadcast wave generation process according to FIG. 4D(1), FIG. 4D(2), and FIG. 4D(3) of this embodiment. In the OFDM broadcast wave generation process according to FIG. 4D(1), FIG. 4D(2), and FIG. 4D(3) of this embodiment, parameters compatible with the current terrestrial digital broadcast service are generally adopted for the parameters in FIG. 4F in order to maintain compatibility with the current terrestrial digital broadcast service. However, if all segments in the modulated wave transmitted in the lower layer of FIG. 4D(3) are assigned to an advanced terrestrial digital broadcast service, it is not necessary to maintain compatibility with the current terrestrial digital broadcast service in the modulated wave. Therefore, in this case, parameters other than those shown in FIG. 4F may be used for the modulated wave transmitted in the lower layer of FIG. 4D(3).

[0148] Next, the carriers of the OFDM transmission wave according to this embodiment will be described. The carriers of the OFDM transmission wave according to this embodiment include carriers for transmitting data such as video and audio, as well as carriers for transmitting pilot signals (SP, CP, AC1, AC2) that serve as the basis for demodulation, and carriers for transmitting TMCC signals, which contain information such as the carrier modulation format and convolutional coding rate. For these transmissions, a number of carriers equivalent to 1 / 9 of the number of carriers per segment are used. Furthermore, a concatenated code is employed for error correction, with a shortened Reed-Solomon (204,188) code being employed as the outer code and a punctured convolutional code with a constraint length of 7 and a coding rate of 1 / 2 being employed as the inner code. Both the outer code and the inner code may use coding different from those described above. The information rate varies depending on parameters such as the carrier modulation format, convolutional coding rate, and guard interval ratio.

[0149] Furthermore, 204 symbols make up one frame, and one frame contains an integer number of TSPs. Transmission parameters are switched at the frame boundaries.

[0150] Pilot signals serving as the basis for demodulation include SP (Scattered Pilot), CP (Continual Pilot), AC (Auxiliary Channel) 1, and AC2. Figure 4G shows an example of the arrangement of pilot signals and the like within a segment in the case of synchronous modulation (QPSK, 16QAM, 64QAM, 256QAM, 1024QAM, 4096QAM, etc.). SPs are inserted into synchronous modulation segments and transmitted once every 12 carriers in the carrier number (frequency axis) direction and once every four symbols in the OFDM symbol number (time axis) direction. Since the amplitude and phase of the SPs are known, they can be used as a basis for synchronous demodulation. Figure 4H shows an example of the arrangement of pilot signals and the like within a segment in the case of differential modulation (DQPSK, etc.). CPs are continuous signals inserted at the left end of differential modulation segments and are used for demodulation.

[0151] AC1 and AC2 carry information in CP, and in addition to serving as pilot signals, are also used to transmit information for broadcasters. They may also be used to transmit other information.

[0152] The arrangement images shown in Figures 4G and 4H are examples for mode 3, where the carrier numbers are 0 to 431, but for mode 1 and mode 2, the carrier numbers are 0 to 107 and 0 to 215, respectively. The carriers transmitting AC1, AC2, and TMCC may be predetermined for each segment. The carriers transmitting AC1, AC2, and TMCC are randomly arranged in the frequency direction to reduce the effects of periodic dips in the transmission path characteristics due to multipath.

[0153] [TMCC Signal] The TMCC signal transmits information (TMCC information) related to the receiver's demodulation operation, such as the hierarchical structure and transmission parameters of the OFDM segments. The TMCC signal is transmitted using a TMCC transmission carrier defined within each segment. Figure 5A shows an example of TMCC carrier bit allocation. The TMCC carrier consists of 204 bits (B0 to B203). B0 is a demodulation reference signal for the TMCC symbol and has a predetermined amplitude and phase reference. B1 to B16 are synchronization signals, consisting of 16-bit words. Two types of synchronization signals, w0 and w1, are defined, and w0 and w1 are transmitted alternately for each frame. B17 to B19 are used to identify the segment type, identifying whether each segment is a differential modulation section or a synchronous modulation section. B20 to B121 contain TMCC information. B122 to B203 are parity bits.

[0154] The TMCC information of the OFDM transmission wave according to this embodiment may be configured to include information for assisting the demodulation and decoding operations of the receiver, such as, for example, a system identification, a transmission parameter switching indicator, a startup control signal (a startup flag for emergency alert broadcasting), current information, next information, a frequency conversion process identification, a physical channel number identification, a main signal identification, a 4K signal transmission layer identification, and an additional layer transmission identification. The current information indicates the current layer configuration and transmission parameters, and the next information indicates the layer configuration and transmission parameters after switching. Transmission parameters are switched on a frame-by-frame basis. FIG. 5B shows an example of bit allocation for the TMCC information. FIG. 5C shows an example of the configuration of transmission parameter information included in the current information / next information. The connected transmission phase correction amount is control information used in cases such as ISDB-TSB (ISDB for Terrestrial Sound Broadcasting), which uses a common transmission method, and a detailed description thereof will be omitted here.

[0155] FIG. 5D shows an example of bit allocation for system identification. Two bits are allocated to the system identification signal. In the case of a current terrestrial digital television broadcasting system, "00" is set. In the case of a terrestrial digital audio broadcasting system using a common transmission method, "01" is set. Furthermore, in the case of an advanced terrestrial digital television broadcasting system such as dual-polarized terrestrial digital broadcasting, single-polarized terrestrial digital broadcasting, or hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment, "10" is set. In an advanced terrestrial digital television broadcasting system, broadcast wave transmission using a dual-polarized transmission method, single-polarized terrestrial digital broadcasting, or hierarchical division multiplexing method makes it possible to simultaneously transmit 2K broadcast programs (broadcast programs with video of 1920 horizontal pixels x 1080 vertical pixels, which may include broadcast programs with video of lower resolution) and 4K broadcast programs (broadcast programs with video exceeding 1920 horizontal pixels x 1080 vertical pixels, including but not limited to broadcast programs with video of 3840 horizontal pixels x 2160 vertical pixels) within the same service.

[0156] The transmission parameter switching index is used to notify the receiver of the switching timing by counting down when switching transmission parameters. This index normally has a value of "1111" and is decremented by one for each frame starting from 15 frames before the switching when switching transmission parameters. The switching timing is synchronized with the next frame in which "0000" is sent. After "0000", the index value returns to "1111". A countdown is performed when switching one or more parameters, such as the system identification of the TMCC information shown in FIG. 5B, the transmission parameter information included in the current information / next information, the frequency conversion processing identification, the main signal identification, the 4K signal transmission layer identification, and the additional layer transmission identification. A countdown is not performed when switching only the start control signal of the TMCC information.

[0157] The start control signal (start flag for emergency alert broadcast) is set to "1" when start control is being performed on the receiver during emergency alert broadcast, and is set to "0" when start control is not being performed.

[0158] The partial reception flag for each current information / next information is set to "1" if the segment in the center of the transmission band is set for partial reception, and set to "0" otherwise. If segment 0 is set for partial reception, the hierarchical layer is specified as hierarchical layer A. If there is no next information, the partial reception flag is set to "1".

[0159] 5E shows an example of bit allocation for the carrier modulation mapping method (data carrier modulation method) in each layer transmission parameter for each current information / next information. When this parameter is "000", it indicates that the modulation method is DQPSK. When it is "001", it indicates that the modulation method is QPSK. When it is "010", it indicates that the modulation method is 16QAM. When it is "011", it indicates that the modulation method is 64QAM. When it is "100", it indicates that the modulation method is 256QAM. When it is "101", it indicates that the modulation method is 1024QAM. When it is "110", it indicates that the modulation method is 4096QAM. When there are no unused layers or next information, this parameter is set to "111".

[0160] The coding rate, time interleaving length, and other parameters may be set according to the organization information of each layer for each current information / next information. The number of segments indicates the number of segments for each layer using a 4-bit value. If there are no unused layers or next information, "1111" is set. Note that settings such as the mode and guard interval ratio are detected independently on the receiver side, so they do not need to be transmitted using TMCC information.

[0161] FIG. 5F shows an example of bit allocation for the frequency conversion process identification. The frequency conversion process identification is set to "0" when the conversion unit 201T or 201L in FIG. 2A performs the frequency conversion process (in the case of a dual-polarized wave transmission system) or the frequency conversion amplification process (in the case of a hierarchical division multiplexing transmission system), which will be described later. The frequency conversion process identification is set to "1" when the frequency conversion process or the frequency conversion amplification process has not been performed. For example, this parameter may be configured to be set to "1" when transmitted from a broadcast station, and to be rewritten to "0" by the conversion unit 201T or 201L when the frequency conversion process or the frequency conversion amplification process is performed by the conversion unit 201T or 201L. In this way, if the bit for the frequency conversion process identification is "0" when received by the second tuner / demodulation unit 130T or the third tuner / demodulation unit 130L of the broadcast receiving device 100, it can be determined that the OFDM transmission wave underwent frequency conversion or other processes after being transmitted from the broadcast station.

[0162] In the dual-polarized terrestrial digital broadcasting according to this embodiment, the frequency conversion process identification bit may be set or rewritten for each of the multiple polarized waves. For example, if neither of the multiple polarized waves is frequency converted by the converter 201T in FIG. 2A, the frequency conversion process identification bit included in both OFDM transmission waves may remain at "1." Furthermore, if only one of the multiple polarized waves is frequency converted by the converter 201T, the frequency conversion process identification bit included in the OFDM transmission wave of the frequency-converted polarized wave may be rewritten to "0" by the converter 201T. Furthermore, if both of the multiple polarized waves are frequency converted by the converter 201T, the frequency conversion process identification bit included in the OFDM transmission wave of both frequency-converted polarized waves may be rewritten to "0" by the converter 201T. In this way, the broadcast receiving device 100 can identify whether or not frequency conversion has been performed for each of the multiple polarized waves.

[0163] Since this frequency conversion process identification bit is not defined in current terrestrial digital broadcasting, it will be ignored by terrestrial digital broadcasting receivers already in use by users. However, this bit may be introduced into a new terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels, which is an improvement over current terrestrial digital broadcasting. In this case, the first tuner / demodulator 130C of the broadcast receiving device 100 according to the embodiment of the present invention may also be configured as a first tuner / demodulator compatible with the new terrestrial digital broadcasting service.

[0164] As a modified example, this parameter may be set to "0" before transmission from a broadcasting station, on the assumption that the OFDM transmission wave is subjected to frequency conversion processing or frequency conversion amplification processing in the conversion unit 201T or conversion unit 201L in Fig. 2A. If the broadcast wave to be received is not an advanced terrestrial digital broadcasting service, this parameter may be configured to be set to "1".

[0165] FIG. 5G shows an example of bit allocation for the physical channel number identification. The physical channel number identification is composed of a 6-bit code and identifies the physical channel number (ch 13 to 52) of the received broadcast wave. If the received broadcast wave is not an advanced terrestrial digital broadcasting service, this parameter is set to "111111." The physical channel number identification bits are not defined in current terrestrial digital broadcasting, and current terrestrial digital broadcasting receivers are unable to obtain the physical channel number of the broadcast wave specified by the broadcast station from TMCC signals, AC signals, etc. In the broadcast receiving device 100 according to an embodiment of the present invention, the physical channel number identification bits of the received OFDM transmission wave can be used to determine the physical channel number set by the broadcast station for the OFDM transmission wave without demodulating carriers other than the TMCC signal and AC signal. Note that the physical channels 13 to 52 are pre-assigned to the frequency band of 470 to 710 MHz, with a bandwidth of 6 MHz per channel. Therefore, the fact that the broadcast receiving device 100 can determine the physical channel number of the OFDM transmission wave based on the physical channel number identification bit means that it can determine the frequency band in which the OFDM transmission wave was transmitted over the air as a terrestrial digital broadcast wave.

[0166] In the dual-polarized terrestrial digital broadcasting according to this embodiment, the broadcast station simply assigns the same physical number to each of the pairs of polarized waves in the bandwidth that originally constitute one physical channel in the OFDM transmission wave generation process. Depending on the installation environment of the broadcast receiving device 100, the converter 201T in FIG. 2A may convert the frequency of only one of the multiple polarized waves. If this results in the frequencies of the multiple polarized wave pairs being different when received by the broadcast receiving device 100, the broadcast receiving device will be unable to demodulate advanced terrestrial digital broadcasting using both polarized waves of the dual-polarized terrestrial digital broadcasting unless it can somehow determine that the multiple polarized waves with different frequencies were originally a pair. Even in such cases, by using the physical channel number identification bit described above, when multiple transmission waves with the same physical channel number identification bit value exist at multiple different frequencies in the broadcast receiving device 100, the broadcast station can identify the transmission waves as those that were originally transmitted as a polarization pair that constituted one physical channel. This makes it possible to realize advanced demodulation of dual-polarized terrestrial digital broadcasting using a plurality of transmission waves that exhibit the same value.

[0167] 5H shows an example of bit allocation for main signal identification, in which the main signal identification bit is allocated to bit B117.

[0168] When the transmitted OFDM transmission wave is a dual-polarized terrestrial digital broadcasting transmission wave, this parameter is set to "1" in the TMCC information of the transmission wave transmitted with the primary polarization. It is set to "0" in the TMCC information of the transmission wave transmitted with the secondary polarization. Note that a transmission wave transmitted with the primary polarization refers to a polarized signal, either a vertically polarized signal or a horizontally polarized signal, that has the same polarization direction as the polarization direction used for transmission of the current terrestrial digital broadcasting service. That is, in areas where the current terrestrial digital broadcasting service uses horizontally polarized transmission, the horizontally polarized signal is the primary polarization and the vertically polarized signal is the secondary polarization for the dual-polarized terrestrial digital broadcasting service. Also, in areas where the current terrestrial digital broadcasting service uses vertically polarized transmission, the vertically polarized signal is the primary polarization and the horizontally polarized signal is the secondary polarization for the dual-polarized terrestrial digital broadcasting service.

[0169] In the broadcast receiving device 100 that receives a transmission wave of a dual-polarized terrestrial digital broadcast according to an embodiment of the present invention, by using the main signal identification bit, it is possible to identify whether the transmission wave being received was transmitted using the primary polarization or the secondary polarization at the time of transmission. For example, by using the process of identifying the primary polarization and the secondary polarization, during the initial scan described below, it is possible to perform an initial scan of the transmission wave transmitted using the primary polarization first, and after the initial scan of the transmission wave transmitted using the primary polarization is completed, perform an initial scan of the transmission wave transmitted using the secondary polarization.

[0170]

[0033] Details of an example of the configuration of the hierarchical layers, segments, and digital broadcasting services to be transmitted for dual-polarized terrestrial digital broadcasting according to this embodiment will be described later. However, when transmitting a current terrestrial digital broadcasting service using a layer consisting of segments included only in the primary polarization and transmitting an advanced terrestrial digital broadcasting service using a layer including segments included in both the primary and secondary polarizations, an initial scan of the transmission wave transmitted in the primary polarization may be performed first to complete the initial scan of the current terrestrial digital broadcasting service, and then an initial scan of the transmission wave transmitted in the secondary polarization may be performed to perform the initial scan of the advanced terrestrial digital broadcasting service. In this way, the initial scan of the advanced terrestrial digital broadcasting service can be performed after the initial scan of the current terrestrial digital broadcasting service is completed, and the settings made in the initial scan of the current terrestrial digital broadcasting service can be reflected in the settings made in the initial scan of the advanced terrestrial digital broadcasting service, which is preferable. Note that the definitions of the "1" and "0" bits of the primary signal identification may be reversed from those described above.

[0171] Furthermore, instead of the main signal identification bit, a polarization direction identification bit may be used as one parameter of the TMCC information. Specifically, the broadcasting station may set the polarization direction identification bit to “1” for horizontally polarized transmission waves and to “0” for vertically polarized transmission waves. In the broadcast receiving device 100 receiving dual-polarized terrestrial digital broadcasting transmission waves according to an embodiment of the present invention, the polarization direction identification bit can be used to identify the polarization direction of the received transmission waves. For example, by using the polarization direction identification process, during the initial scan described below, it is possible to first perform an initial scan of horizontally polarized transmission waves, and then perform an initial scan of vertically polarized transmission waves after the initial scan of horizontally polarized transmission waves is completed. The effect of this processing can be explained by replacing "primary polarization" with "horizontal polarization" and "secondary polarization" with "vertical polarization" in the initial scanning section of the above-mentioned main signal identification bit, so a repeated explanation will be omitted. Note that the definitions of "1" and "0" in the polarization direction identification bit may be reversed from the above explanation.

[0172] Furthermore, instead of the main signal identification bit described above, the first signal / second signal identification bit may be used as a parameter of the TMCC information. Specifically, one of horizontally polarized waves and vertically polarized waves may be defined as the first polarization, and a broadcast signal of a transmission wave transmitted using the first polarization may be defined as the first signal, and the broadcast station may set the first signal / second signal identification bit to "1." The other polarization may be defined as the second polarization, and a broadcast signal of a transmission wave transmitted using the second polarization may be defined as the second signal, and the broadcast station may set the first signal / second signal identification bit to "0." In the broadcast receiving device 100 that receives a transmission wave of dual-polarized terrestrial digital broadcasting according to an embodiment of the present invention, the first signal / second signal identification bit can be used to identify the polarization direction in which the transmission wave was transmitted. Note that the first signal / second signal identification bit is simply a result of changing the concepts of "primary polarization" and "secondary polarization" from the definition of the main signal identification bit described above to "first polarization" and "second polarization," and the processing and effects in broadcast receiving device 100 can be achieved by simply replacing "primary polarization" with "first polarization" and "secondary polarization" with "second polarization" in the parts relating to the processing of broadcast receiving device 100 in the description of the main signal identification bit described above, so a repeated explanation will be omitted.

[0173] The definition of the meanings of "1" and "0" of the first signal and second signal identification bits may be reversed from that explained above.

[0174] Note that the above-mentioned main signal identification, polarization direction identification, and first / second signal identification are not required when the broadcast wave is the single-polarized terrestrial digital broadcasting service according to this embodiment or when it is not an advanced terrestrial digital broadcasting service, and this parameter can be set to "1".

[0175] Next, in the transmission wave of the hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment, the upper and lower layer identification bit may be used as one parameter of the TMCC information instead of the main signal identification bit. Specifically, in the TMCC information of the modulated wave transmitted in the upper layer, the upper and lower layer identification bit is set to "1", and in the TMCC information of the transmission wave transmitted in the lower layer, the upper and lower layer identification bit is set to "0". Furthermore, if the broadcast wave is not an advanced terrestrial digital broadcasting service, this parameter may be set to "1".

[0176] In the hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment, in the process of generating an OFDM transmission wave at the broadcast station, the conversion unit 201L in FIG. 2A may perform frequency conversion and signal amplification on the lower layer of multiple modulated waves originally transmitted on upper and lower layers of a single physical channel, depending on the installation environment of the broadcast receiving device 100. When receiving a transmission wave of hierarchical division multiplexing terrestrial digital broadcasting, the broadcast receiving device 100 can identify whether the modulated wave was originally transmitted on the upper layer or the lower layer based on the above-mentioned upper and lower layer identification bits. For example, this identification process can perform an initial scan of an advanced terrestrial digital broadcasting service transmitted on the lower layer after completing an initial scan of a current terrestrial digital broadcasting service transmitted on the upper layer, thereby enabling the settings obtained by the initial scan of the current terrestrial digital broadcasting service to be reflected in the settings obtained by the initial scan of the advanced terrestrial digital broadcasting service. Furthermore, the third tuner / demodulator 130L of the broadcast receiving device 100 can use this identification result to switch between the processing of the demodulator 133S and the demodulator 133L.

[0177] In the following description of the dual-polarized transmission system in each embodiment, unless otherwise specified, an example will be described in which horizontal polarization is the primary polarization and vertical polarization is the secondary polarization. However, the primary and secondary relationship between horizontal polarization and vertical polarization may be reversed. Figure 5I shows an example of bit allocation for 4K signal transmission hierarchy identification.

[0178] When the broadcast waves to be transmitted are those of the dual-polarized terrestrial digital broadcasting service according to this embodiment, the 4K signal transmission layer identification bits may indicate whether 4K broadcast programs are transmitted using both horizontally polarized and vertically polarized signals for each of layers B and C. One bit may be assigned to each of the settings for layer B and layer C. For example, when the 4K signal transmission layer identification bits for each of layers B and C are set to "0," this may indicate that 4K broadcast programs are transmitted using both horizontally polarized and vertically polarized signals for that layer. When the 4K signal transmission layer identification bits for each of layers B and C are set to "1," this may indicate that 4K broadcast programs are not transmitted using both horizontally polarized and vertically polarized signals for that layer. In this way, the broadcast receiving device 100 can use the 4K signal transmission layer identification bits to identify whether 4K broadcast programs are transmitted using both horizontally polarized and vertically polarized signals for each of layers B and C.

[0179] Furthermore, when the broadcast wave to be transmitted is a transmission wave of the single-polarized terrestrial digital broadcasting service according to this embodiment, the bit of the 4K signal transmission layer identification may indicate whether or not 4K broadcast programs are to be transmitted on each of the layers B and C. One bit may be assigned to each of the settings of the layers B and C. For example, when the bit of the 4K signal transmission layer identification for each of the layers B and C is "0," this may indicate that 4K broadcast programs are to be transmitted on that layer. When the bit of the 4K signal transmission layer identification for each of the layers B and C is "1," this may indicate that 4K broadcast programs are not to be transmitted on that layer. In this way, the broadcast receiving device 100 can use the bit of the 4K signal transmission layer identification to identify whether or not 4K broadcast programs are to be transmitted on each of the layers B and C.

[0180] Furthermore, if the broadcast waves to be transmitted are those of the hierarchical division multiplexing terrestrial digital broadcasting service of this embodiment, the bit of the 4K signal transmission layer identification may indicate whether or not a 4K broadcast program is to be transmitted on a lower layer. If B119 of this parameter is "0," the 4K broadcast program is to be transmitted on a lower layer. If B119 of this parameter is "1," the 4K broadcast program is not to be transmitted on a lower layer. In this manner, the broadcast receiving device 100 can use the bit of the 4K signal transmission layer identification to identify whether or not a 4K broadcast program is to be transmitted on a lower layer. Note that if the broadcast waves to be transmitted are those of the hierarchical division multiplexing terrestrial digital broadcasting service of this embodiment, B118 of this parameter may be undefined.

[0181] When this parameter is "0", the NUC (Non-Uniform Constellation) modulation method can be adopted as the carrier modulation mapping method in addition to the basic modulation method shown in Fig. 5E. In this case, the current / next information of the transmission parameter additional information for the B / C layers can be transmitted using AC1 or the like.

[0182] Also, if the broadcast wave to be transmitted is not an advanced terrestrial digital broadcasting service, these parameters may be set to "1".

[0183] The definitions of "0" and "1" of the 4K signal transmission layer identification bits described above may be reversed.

[0184] 5J shows an example of bit allocation for the additional layer transmission identification. The additional layer transmission identification bits may indicate whether the broadcast wave to be transmitted is a dual-polarized terrestrial digital broadcasting service of this embodiment, and whether layers B and C of the transmission wave transmitted by the secondary polarization are to be used as virtual layers D and E, respectively.

[0185] For example, in the illustrated example, the bit assigned to B120 is the hierarchical layer D transmission identification bit, and if this parameter is "0," hierarchical layer B transmitted using the secondary polarization is used as the virtual hierarchical layer D. More precisely, this means that, among the segments transmitted using the secondary polarization, a group of segments having the same segment number as a segment belonging to hierarchical layer B transmitted using the primary polarization is treated as hierarchical layer D, which is a different layer from hierarchical layer B transmitted using the primary polarization. If this parameter is "1," hierarchical layer B transmitted using the secondary polarization is not used as the virtual hierarchical layer D, but is used as hierarchical layer B.

[0186] Furthermore, for example, the bit allocated to B121 is a layer E transmission identification bit, and when this parameter is "0," layer C transmitted with the secondary polarization is used as virtual layer E. To be precise, this means that among the segments transmitted with the secondary polarization, a group of segments having the same segment number as a segment belonging to layer C transmitted with the primary polarization is treated as layer E, which is a different layer from layer C transmitted with the primary polarization. When this parameter is "1," layer C transmitted with the secondary polarization is not used as virtual layer E, but is used as layer C.

[0187] In this way, the broadcast receiving device 100 can use the additional layer transmission identification bits (layer D transmission identification bit and / or layer E transmission identification bit) to identify the presence or absence of layers D and E transmitted in the secondary polarization. That is, in the terrestrial digital broadcasting according to this embodiment, by using the additional layer transmission identification parameters shown in Figure 5J, it is possible to operate new layers (layers D and E in the example of Figure 5J) beyond the number of layers currently limited to three, layers A, B, and C, in terrestrial digital broadcasting.

[0188] If this parameter is "0," it is possible to make the parameters shown in Figure 5C, such as the carrier modulation mapping method, coding rate, and time interleaving length, different between virtual layer D / virtual layer E and layers B / C. In this case, if the current / next information for parameters such as the carrier modulation mapping method, convolutional coding rate, and time interleaving length for virtual layer D / virtual layer E is transmitted using AC information (e.g., AC1), the broadcast receiving device 100 can determine the parameters, such as the carrier modulation mapping method, convolutional coding rate, and time interleaving length for virtual layer D / virtual layer E.

[0189] As a modified example, when the additional layer transmission identification bit (layer D transmission identification bit and / or layer E transmission identification bit) is "0," the transmission parameters of layers B and / or C in the current information / next information of the TMCC information transmitted on the secondary polarization may be switched to the transmission parameters of virtual layer D and / or virtual layer E. In this case, when virtual layer D and / or virtual layer E are used, layers A, B, and C are used on the primary polarization, and the transmission parameters of these layers can be transmitted in the current information / next information of the TMCC information transmitted on the primary polarization. Furthermore, layers A, D, and E are used on the secondary polarization, and the transmission parameters of these layers can be transmitted in the current information / next information of the TMCC information transmitted on the secondary polarization. Even in this case, the broadcast receiving device 100 can determine parameters such as the carrier modulation mapping method, convolutional coding rate, and time interleaving length for the virtual layer D and virtual layer E.

[0190] In addition, if the broadcast wave to be transmitted is not an advanced terrestrial digital broadcasting service, or if it is an advanced terrestrial digital broadcasting service but uses a single polarization transmission method or a hierarchical division multiplexing transmission method, this parameter may be configured to be set to ``1''.

[0191] The parameters for additional layer transmission identification may be stored in both the TMCC information of the primary polarization and the TMCC information of the secondary polarization, but as long as they are stored in the TMCC information of at least the secondary polarization, all of the above-mentioned processes can be realized.

[0192] Furthermore, the definitions of "0" and "1" of the bits of the additional layer transmission identification explained above may be reversed from the above explanation.

[0193] Note that, if the above-mentioned 4K signal transmission layer identification parameter indicates that a 4K broadcast program is to be transmitted on layer B, even if the above-mentioned layer D transmission identification bit indicates that layer B is to be used as the virtual layer D, the broadcast receiving device 100 may be configured to ignore the layer D transmission identification bit. Similarly, if the 4K signal transmission layer identification parameter indicates that a 4K broadcast program is to be transmitted on layer C, even if the layer E transmission identification bit indicates that layer C is to be used as the virtual layer E, the broadcast receiving device 100 may be configured to ignore the layer E transmission identification bit. By clarifying the priority of the bits used in the determination process in this way, conflicts in the determination process in the broadcast receiving device 100 can be prevented.

[0194] Furthermore, in the transmitted broadcast waves, the above-mentioned frequency conversion process identification bits, physical channel number identification bits, main signal identification bits, 4K signal transmission identification bits, additional layer transmission identification bits, etc. may be set as a general rule to all bits set to "1" if the above-mentioned system identification parameter is not "10." Even if the system identification parameter is not "10" but, exceptionally, due to some problem, the frequency conversion process identification bits, physical channel number identification bits, main signal identification bits, 4K signal transmission identification bits, and additional layer transmission identification bits are not "1," the broadcast receiving device 100 may be configured to ignore the bits that are not "1" and determine that all of these bits are "1."

[0195] FIG. 5K shows an example of the "coding rate" bits shown in FIG. 5C, that is, bit allocation for identifying the coding rate of error correction.

[0196] In the current terrestrial digital broadcasting system for 2K broadcasting, an identification bit that transmits a coding rate dedicated to a "convolutional code" is transmitted. However, in the digital broadcasting according to this embodiment, an advanced terrestrial digital broadcasting service for 4K broadcasting can be broadcasted in combination with a terrestrial digital broadcasting service for 2K broadcasting. As already explained, the advanced terrestrial digital broadcasting service for 4K broadcasting can use an LDPC code as an inner code.

[0197] Therefore, unlike the current 2K terrestrial digital broadcasting system, the coding rate identification bits for error correction according to this embodiment shown in FIG. 5K are not coding rate identification bits dedicated to convolutional codes, but are configured to also be compatible with LDPC codes.

[0198] Here, whether the inner code of the target terrestrial digital broadcasting service is a convolutional code or an LDPC code, bits allocated in a common range are used as identification bits for coding rate transmission, thereby realizing bit saving.Furthermore, even if the same identification bits are used, by setting the coding rate independently for when the inner code of the target terrestrial digital broadcasting service is a convolutional code and when it is an LDPC code, the digital broadcasting system can adopt a group of coding rate options suitable for each coding method.

[0199] Specifically, in the example of FIG. 5K, when the identification bits are “000”, the coding rate is 1 / 2 if the inner code is a convolutional code, and 2 / 3 if the inner code is an LDPC code. When the identification bits are “001”, the coding rate is 2 / 3 if the inner code is a convolutional code, and 3 / 4 if the inner code is an LDPC code. When the identification bits are “010”, the coding rate is 3 / 4 if the inner code is a convolutional code, and 5 / 6 if the inner code is an LDPC code. When the identification bits are “011”, the coding rate is 5 / 6 if the inner code is a convolutional code, and 2 / 16 if the inner code is an LDPC code. When the identification bits are “100”, the coding rate is 7 / 8 if the inner code is a convolutional code, and 6 / 16 if the inner code is an LDPC code. When the identification bits are "101", if the inner code is a convolutional code, it indicates that it is undefined, and if the inner code is an LDPC code, it indicates that the coding rate is 10 / 16. When the identification bits are "110", if the inner code is a convolutional code, it indicates that it is undefined, and if the inner code is an LDPC code, it indicates that the coding rate is 14 / 16. If there is no unused layer or next information, this parameter is set to "111". Note that the above-mentioned coding rate 2 / 3 may be substituted for coding rate 81 / 120. Coding rate 3 / 4 may be substituted for coding rate 89 / 120. Coding rate 5 / 6 may be substituted for coding rate 101 / 120. Coding rates 8 / 16, 12 / 16, etc. may also be assigned.

[0200] Whether the inner code of a target terrestrial digital broadcasting service is a convolutional code or an LDPC code may be identified using the result of identifying whether the terrestrial digital broadcasting service is a current terrestrial digital broadcasting service or an advanced terrestrial digital broadcasting service. This identification may be performed using the identification bit described in FIG. 5D or 5I. Here, if the target terrestrial digital broadcasting service is a current terrestrial digital broadcasting service, the inner code may be identified as a convolutional code. Also, if the target terrestrial digital broadcasting service is an advanced terrestrial digital broadcasting service, the inner code may be identified as an LDPC code.

[0201] As another example of identifying whether the inner code of the target terrestrial digital broadcasting service is a convolutional code or an LDPC code, the identification may be based on an error correction method identification bit, which will be described later with reference to FIG. 6I.

[0202] The error correction coding rate identification bits shown in FIG. 5K described above are suitable because they can accommodate a plurality of inner code methods while preventing an increase in the number of identification bits.

[0203] Furthermore, in an advanced terrestrial digital broadcasting service using a dual-polarized transmission system, the TMCC information of a transmission wave transmitted using horizontal polarization and the TMCC information of a transmission wave transmitted using vertical polarization may be the same or different. Similarly, in an advanced terrestrial digital broadcasting service using a hierarchical division multiplexing transmission system, the TMCC information of a transmission wave transmitted in an upper layer and the TMCC information of a transmission wave transmitted in a lower layer may be the same or different. Furthermore, the above-mentioned frequency conversion process identification parameters, main signal identification parameters, additional layer transmission identification, etc. may be written only in the TMCC information of a transmission wave transmitted using a secondary polarization or a transmission wave transmitted in a lower layer.

[0204] In the above description, an example has been described in which a frequency conversion process identification parameter, a main signal identification parameter, a polarization direction identification parameter, a first / second signal identification parameter, an upper / lower layer identification parameter, a 4K signal transmission layer identification parameter, and an additional layer transmission identification parameter are included in a TMCC signal (TMCC carrier) and transmitted. However, these parameters may also be included in an AC signal (AC carrier) and transmitted. That is, these parameters may be transmitted in a signal of a carrier (such as a TMCC carrier or AC carrier) modulated by a modulation method that performs mapping with a smaller number of states than the modulation method of the data carrier.

[0205] [AC Signal] The AC signal is an additional information signal related to broadcasting, such as additional information related to modulated wave transmission control or earthquake motion warning information. Earthquake motion warning information is transmitted using the AC carrier of segment 0. On the other hand, additional information related to modulated wave transmission control can be transmitted using any AC carrier. Figure 6A shows an example of bit allocation for an AC signal. The AC signal consists of 204 bits (B0 to B203). B0 is a demodulation reference signal for the AC symbol and has predetermined amplitude and phase references. B1 to B3 are signals for identifying the configuration of the AC signal. B4 to B203 are used to transmit additional information related to modulated wave transmission control or earthquake motion warning information.

[0206] Figure 6B shows an example of bit allocation for AC signal configuration identification. When transmitting earthquake motion warning information using B4 to B203 of the AC signal, this parameter is set to "001" or "110." The configuration identification parameter ("001" or "110") when transmitting earthquake motion warning information is the same code as the first three bits (B1 to B3) of the TMCC signal synchronization signal, and is sent alternately for each frame at the same timing as the TMCC signal. Furthermore, if this parameter has a value other than those mentioned above, it indicates that additional information related to modulated wave transmission control is being transmitted using B4 to B203 of the AC signal. In this case, the AC signal configuration identification parameter is sent alternately between "000" and "111," or between "010" and "101," or between "011" and "100," for each frame.

[0207] B4 to B203 of the AC signal are used to transmit additional information related to the transmission control of the modulated wave or to transmit earthquake alarm information.

[0208] The transmission of additional information related to the transmission control of modulated waves may be performed using various bit configurations. For example, the frequency conversion process identification, physical channel number identification, main signal identification, 4K signal transmission layer identification, additional layer transmission identification, etc., described in the description of the TMCC signal, may be transmitted by allocating bits to additional information related to the transmission control of modulated waves of AC signals instead of or in addition to the TMCC signal. In this way, the broadcast receiving device 100 can use these parameters to perform the various identification processes already described in the description of the TMCC signal. Also, transmission parameter additional information related to the transmission layer of a 4K broadcast program when any of the 4K signal transmission layer identification parameters is "0," or current / next information of the transmission parameters related to the virtual D layer / virtual E layer when any of the additional layer transmission identification parameters is "0." In this way, the broadcast receiving device 100 can acquire the transmission parameters of each layer using these parameters and control the demodulation process of each layer.

[0209] Transmission of earthquake warning information may be performed using the bit allocation shown in Figure 6C. The earthquake warning information consists of a synchronization signal, start / end flag, update flag, signal identification, earthquake warning detail information, CRC, parity bit, etc. The synchronization signal consists of a 13-bit code and is the same as the 13 bits (B4 to B16) of the TMCC signal synchronization signal excluding the first 3 bits. When the AC signal configuration identification indicates that earthquake warning information is being transmitted, the 16-bit code combining the configuration identification and synchronization signal becomes a 16-bit synchronization word identical to the TMCC synchronization signal. The start / end flag consists of a 2-bit code as a flag for the start timing / end timing of earthquake warning information. The start / end flag changes from "11" to "00" at the start of transmission of earthquake warning information and changes from "00" to "11" at the end of transmission of earthquake warning information. The update flag is composed of a 2-bit code, and is incremented by "1" from the initial value "00" each time a change occurs in the content of the series of earthquake motion warning detailed information transmitted when the start / end flag is "00". After "11", it returns to "00". When the start / end flag is "11", the update flag also becomes "11".

[0210] FIG. 6D shows an example of bit allocation for signal identification. The signal identification is composed of a 3-bit code and is used to identify the type of earthquake motion warning detail information. When this parameter is "000", it means "earthquake motion warning detail information (applicable area present)". When this parameter is "001", it means "earthquake motion warning detail information (no applicable area)". When this parameter is "010", it means "test signal for earthquake motion warning detail information (applicable area present)". When this parameter is "011", it means "test signal for earthquake motion warning detail information (no applicable area)". When this parameter is "111", it means "no earthquake motion warning detail information". Note that when the start / end flag is "00", the signal identification is "000", "001", "010", or "011". When the start / end flag is "11", the signal identification is "111".

[0211] The earthquake motion warning detail information is composed of an 88-bit code. When the signal identification is "000," "001," "010," or "011," the earthquake motion warning detail information transmits information such as information about the current time when the earthquake motion warning information is sent, information indicating the area that is the target of the earthquake motion warning, and the latitude / longitude / seismic intensity of the epicenter of the earthquake that is the target of the earthquake motion warning. An example of bit allocation of the earthquake motion warning detail information when the signal identification is "000," "001," "010," or "011" is shown in Figure 6E. Furthermore, when the signal identification is "111," it is possible to transmit a code for identifying a broadcasting company using the bits of the earthquake motion warning detail information. An example of bit allocation of the earthquake motion warning detail information when the signal identification is "111" is shown in Figure 6F.

[0212] The CRC is a code generated using a predetermined generating polynomial for B21 to B111 of the earthquake warning information. The parity bit is a code generated by a shortened code (187, 105) of the difference set cyclic code (273, 191) for B17 to B121 of the earthquake warning information.

[0213] The broadcast receiving device 100 can perform various controls to deal with an emergency using the parameters related to the earthquake motion warning described in Figures 6C, 6D, 6E, and 6F. For example, it is possible to perform control to present information related to the earthquake motion warning, control to switch low-priority display content to a display related to the earthquake motion warning, and control to terminate the display of an application and switch to a display related to the earthquake motion warning or broadcast program video.

[0214] FIG. 6G shows an example of bit allocation for additional information related to modulated wave transmission control. The additional information related to modulated wave transmission control is composed of a synchronization signal, current information, next information, parity bit, etc. The synchronization signal is composed of a 13-bit code and is the same code as the 13 bits (B4 to B16) excluding the first 3 bits of the TMCC signal synchronization signal. The synchronization signal does not have to be the same code as the 13 bits (B4 to B16) excluding the first 3 bits of the TMCC signal synchronization signal. When the AC signal configuration identification indicates that additional information related to modulated wave transmission control is transmitted, the 16-bit code combining the configuration identification and synchronization signal becomes a 16-bit synchronization word conforming to the TMCC synchronization signal. It may also be a 16-bit synchronization word different from the TMCC synchronization signal. The current information indicates current information on transmission parameter additional information when transmitting a 4K broadcast program on layer B or layer C, and transmission parameters related to virtual layer D or virtual layer E. The next information indicates additional transmission parameter information when transmitting a 4K broadcast program on layer B or layer C, and information after switching on transmission parameters related to virtual layer D or virtual layer E.

[0215] In the example of FIG. 6G , current information B18 to B30 is current information on layer B transmission parameter additional information, indicating the current information on the transmission parameter additional information when transmitting a 4K broadcast program on layer B. Current information B31 to B43 is current information on layer C transmission parameter additional information, indicating the current information on the transmission parameter additional information when transmitting a 4K broadcast program on layer C. Next information B70 to B82 is information on layer B transmission parameter additional information after the transmission parameters have been switched, indicating the information on the transmission parameters on the transmission parameter additional information when transmitting a 4K broadcast program on layer B. Next information B83 to B95 is information on layer C transmission parameter additional information after the transmission parameters have been switched, indicating the information on the transmission parameters on the transmission parameter additional information when transmitting a 4K broadcast program on layer C. Here, the transmission parameter additional information refers to modulation-related transmission parameters that are added to the transmission parameters of the TMCC information shown in FIG. 5C to expand the specifications. Specific content of the transmission parameter additional information will be described later.

[0216] In the example of Figure 6G, current information B44 to B56 is current information on transmission parameters for the virtual D tier when the virtual D tier is being operated. Current information B57 to B69 is current information on transmission parameters for the virtual E tier when the virtual E tier is being operated. Furthermore, next information B96 to B108 is information after switching of transmission parameters for the virtual D tier when the virtual D tier is being operated. Current information B109 to B121 is information after switching of transmission parameters for the virtual E tier when the virtual E tier is being operated. The parameters stored in the transmission parameters for the virtual D tier and the transmission parameters for the virtual E tier may be the same as those shown in Figure 5C.

[0217] The virtual D layer and the virtual E layer are layers that do not exist in current terrestrial digital broadcasting. It is not easy to increase the number of bits in the TMCC information of Figure 5B because compatibility with current terrestrial digital broadcasting must be maintained. Therefore, in an embodiment of the present invention, the transmission parameters for the virtual D layer and the virtual E layer are stored in the AC information as shown in Figure 6G, rather than in the TMCC information.

[0218] This makes it possible to transmit to the receiving device modulation information for the new virtual layers D and E while maintaining compatibility of the TMCC information with current terrestrial digital broadcasting. As a result, when layers B and C of the transmission waves transmitted in the secondary polarization of the broadcast waves of the dual-polarized terrestrial digital broadcasting service according to this embodiment are used as virtual layers D and E, it becomes possible to set the transmission parameters of the virtual layers D and E of the transmission waves transmitted in the secondary polarization differently from the transmission parameters of the layers B and C of the transmission waves transmitted in the primary polarization.

[0219] Note that if the virtual D layer or the virtual E layer is not used, the transmission parameter information for the unused layer can be ignored by the broadcast receiving device 100. For example, if the additional layer transmission identification parameter of the TMCC information in Figure 5J indicates "1" for the virtual D layer or the virtual E layer (indicating that the virtual D layer / virtual E layer is not used), the broadcast receiving device 100 can be configured to ignore any value contained in the transmission parameters shown in Figure 6G for the unused virtual D layer or virtual E layer. Next, the transmission parameter additional information described in Figure 6G will be described in detail.

[0220] A specific example of the additional transmission parameter information is shown in Fig. 6H. The additional transmission parameter information can include parameters for an error correction method, parameters for a constellation format, and the like.

[0221] The error correction method indicates the setting of the coding method to be used as the error correction method for the inner code and outer code when transmitting a 4K broadcast program (advanced terrestrial digital broadcasting service) on layer B or layer C. Figure 6I shows an example of bit allocation for the error correction method. When this parameter is "000", a convolutional code is used as the inner code and a shortened RS code is used as the outer code when transmitting a 4K broadcast program on layer B or layer C. When this parameter is "001", an LDPC code is used as the inner code and a BCH code is used as the outer code when transmitting a 4K broadcast program on layer B or layer C. Other combinations may also be set and selected.

[0222] Furthermore, when transmitting a 4K broadcast program on layer B or layer C, it is possible to adopt not only a uniform constellation but also a non-uniform constellation (NUC) as the carrier modulation mapping method. FIG. 6J shows an example of bit allocation for a constellation format. When this parameter is "000," the carrier modulation mapping method selected by the transmission parameters of the TMCC information is applied using a uniform constellation. When this parameter is any of "001" to "111," the carrier modulation mapping method selected by the transmission parameters of the TMCC information is applied using a non-uniform constellation. Note that when a non-uniform constellation is applied, the optimal value for the non-uniform constellation differs depending on the type of error correction method, its coding rate, and the like. Therefore, when the constellation format parameter is any of "001" to "111," the broadcast receiving device 100 of this embodiment simply determines the non-uniform constellation to be used in the demodulation process based on the parameters of the carrier modulation mapping method, the parameters of the error correction method, and the parameters of its coding rate. This determination may be made by referring to a predetermined table stored in advance in the broadcast receiving device 100, for example.

[0223] [Transmission Method 1 for Advanced Terrestrial Digital Broadcasting Services] In order to realize 4K (3840 horizontal pixels x 2160 vertical pixels) broadcasting while maintaining the viewing environment of current terrestrial digital broadcasting services, a dual-polarized transmission method will be described as an example of a transmission method for advanced terrestrial digital broadcasting services according to an embodiment of the present invention. The dual-polarized transmission method according to an embodiment of the present invention is a method that shares some specifications with the current terrestrial digital broadcasting method. For example, 13 segments within a band of approximately 6 MHz corresponding to one physical channel are divided, with seven segments assigned to transmitting 2K (1920 horizontal pixels x 1080 vertical pixels) broadcast programs, five segments assigned to transmitting 4K broadcast programs, and one segment assigned to mobile reception (so-called one-segment broadcasting). Furthermore, the five segments for 4K broadcasting use not only horizontally polarized signals but also vertically polarized signals, ensuring a transmission capacity of a total of 10 segments using MIMO (Multiple-Input Multiple-Output) technology. Note that 2K broadcast programs maintain image quality by optimizing the latest MPEG-2 Video compression technology, etc., so that they can be received on current television receivers, while 4K broadcast programs ensure image quality by optimizing HEVC compression technology, which is more efficient than MPEG-2 Video, and by using multi-value modulation, etc. Note that the number of segments assigned to each broadcast may differ from that described above.

[0224] 7A shows an example of a dual-polarized transmission system for an advanced terrestrial digital broadcasting service according to an embodiment of the present invention. A frequency band of 470 to 710 MHz is used to transmit broadcast waves for the terrestrial digital broadcasting service. There are 40 physical channels in this frequency band, ranging from 13 to 52 ch, each with a bandwidth of 6 MHz. In the dual-polarized transmission system according to the embodiment of the present invention, both horizontally polarized and vertically polarized signals are used within one physical channel.

[0225] FIG. 7A shows two examples of 13-segment allocation, (1) and (2). In example (1), a 2K broadcast program is transmitted using segments 1 to 7 (layer B) of the horizontally polarized signal. A 4K broadcast program is transmitted using a total of 10 segments: segments 8 to 12 (layer C) of the horizontally polarized signal and segments 8 to 12 (layer C) of the vertically polarized signal. Segments 1 to 7 (layer B) of the vertically polarized signal may be used to transmit the same 2K broadcast program as segments 1 to 7 (layer B) of the horizontally polarized signal. Alternatively, segments 1 to 7 (layer B) of the vertically polarized signal may be used to transmit a different broadcast program from the 2K broadcast program transmitted by segments 1 to 7 (layer B) of the horizontally polarized signal. Alternatively, segments 1 to 7 (layer B) of the vertically polarized signal may be used to transmit other data or may be unused. Identification information regarding how to use segments 1 to 7 (layer B) of the vertically polarized signal can be transmitted to the receiving device using the 4K signal transmission layer identification parameter or additional layer transmission identification parameter of the TMCC signal, as already described. These parameters allow the broadcast receiving device 100 to identify how to handle segments 1 to 7 (layer B) of the vertically polarized signal. Furthermore, a 2K broadcast program transmitted using layer B of the horizontally polarized signal and a 4K broadcast program transmitted using layer C of both horizontally and vertically polarized signals may be simulcasts that transmit the same broadcast program at different resolutions, or may transmit broadcast programs with different content. Segment 0 of both horizontally and vertically polarized signals transmits the same OneSeg broadcast program.

[0226] Example (2) of FIG. 7A is a variant different from example (1). In example (2), a 4K broadcast program is transmitted using a total of 10 segments: segments 1 to 5 (layer B) of the horizontally polarized signal and segments 1 to 5 (layer B) of the vertically polarized signal. A 2K broadcast program is transmitted using segments 6 to 12 (layer C) of the horizontally polarized signal. In example (2), segments 6 to 12 (layer C) of the vertically polarized signal may also be used to transmit the same broadcast program as the 2K broadcast program transmitted by segments 6 to 12 (layer C) of the horizontally polarized signal. Segments 6 to 12 (layer C) of the vertically polarized signal may also be used to transmit a different broadcast program from the 2K broadcast program transmitted by segments 6 to 12 (layer C) of the horizontally polarized signal. Furthermore, segments 6 to 12 (layer C) of the vertically polarized signal may be used for other data transmission or may be unused. These identification information is also similar to example (1), and therefore will not be described again.

[0227] In both of the examples (1) and (2) in FIG. 7A, the horizontal polarization is the main polarization, but depending on the application, the horizontal polarization and the vertical polarization may be reversed.

[0228] Figure 7B shows an example of the configuration of a broadcasting system for an advanced terrestrial digital broadcasting service using a dual-polarized transmission method according to an embodiment of the present invention. This shows both the transmitting system and the receiving system for an advanced terrestrial digital broadcasting service using a dual-polarized transmission method. The configuration of the broadcasting system for an advanced terrestrial digital broadcasting service using a dual-polarized transmission method is basically the same as the configuration of the broadcasting system shown in Figure 1, except that the radio tower 300T, which is a broadcasting station facility, is a dual-polarized transmitting antenna capable of simultaneously transmitting horizontally polarized signals and vertically polarized signals. Also, in the example of Figure 7B, only the tuning / detection unit 131H and tuning / detection unit 131V of the second tuner / demodulation unit 130T of the broadcast receiving device 100 are shown, and other operating units are omitted.

[0229] The horizontally polarized signal transmitted from radio tower 300T is received by the horizontally polarized wave receiving element of antenna 200T, which is a dual-polarized receiving antenna, and is input to tuning / detection unit 131H from connector 100F1 via coaxial cable 202T1. On the other hand, the vertically polarized signal transmitted from radio tower 300T is received by the vertically polarized wave receiving element of antenna 200T, and is input to tuning / detection unit 131V from connector 100F2 via coaxial cable 202T2. An F-type connector is generally used as the connector connecting the antenna (coaxial cable) to the television receiver.

[0230] Here, there is a possibility that a user may mistakenly connect coaxial cable 202T1 to connector unit 100F2 and coaxial cable 202T2 to connector unit 100F1. In this case, a malfunction may occur, such as an inability to identify whether an input broadcast signal is a horizontally polarized signal or a vertically polarized signal in channel selection / detection unit 131H and channel selection / detection unit 131V. To prevent the malfunction, one of the connectors connecting the antenna (coaxial cable) to the television receiver, for example, the connector between coaxial cable 202T2 and connector unit 100F2 transmitting a vertically polarized signal, may be configured to have a different F-type connector shape from the connector between coaxial cable 202T1 and connector unit 100F1 transmitting a horizontally polarized signal. Alternatively, channel selection / detection unit 131H and channel selection / detection unit 131V may be controlled to identify whether the input broadcast signal is a horizontally polarized signal or a vertically polarized signal by referring to the main signal identification in the TMCC information of each input signal and operate accordingly. Furthermore, instead of the two coaxial cables, coaxial cable 202T1 and coaxial cable 202T2, antenna 200T and broadcast receiving device 100 may be connected by a single multi-core coaxial cable.

[0231] Figure 7C shows an example of a different configuration from the above-described configuration of a broadcasting system for an advanced terrestrial digital broadcasting service using a dual-polarized transmission system according to an embodiment of the present invention. A configuration such as that shown in Figure 7B, in which the broadcast receiving device 100 has two broadcast signal input connectors and uses two coaxial cables to connect the antenna 200T to the broadcast receiving device 100, may not necessarily be suitable in terms of equipment cost and handling of the cabling. Therefore, in the configuration shown in Figure 7C, a horizontally polarized signal received by the horizontally polarized receiving element of the antenna 200T and a vertically polarized signal received by the vertically polarized receiving element of the antenna 200T are input to a converter 201T, and the converter 201T and the broadcast receiving device 100 are connected by a single coaxial cable 202T3. The broadcast signal input from the connector 100F3 is split and input to the tuning / detection unit 131H and the tuning / detection unit 131V. The connector section 100F3 may have the function of supplying operating power to the conversion section 201T.

[0232] The converter 201T may be part of the equipment in the environment where the broadcast receiving device 100 is installed (e.g., an apartment building, etc.). Alternatively, it may be configured as an integrated device with the antenna 200T and installed in a home, etc. The converter 201T performs frequency conversion processing on either the horizontally polarized signal received by the horizontally polarized wave receiving element of the antenna 200T or the vertically polarized signal received by the vertically polarized wave receiving element of the antenna 200T. This processing enables the horizontally polarized signal and the vertically polarized signal transmitted from the radio tower 300T to the antenna 200T using horizontally polarized waves and vertically polarized waves of the same frequency band to be separated into different frequency bands and simultaneously transmitted to the broadcast receiving device 100 via a single coaxial cable 202T3. If necessary, frequency conversion processing may be performed on both the horizontally polarized signal and the vertically polarized signal, but in this case, the frequency bands of the two signals after frequency conversion must also be different from each other. Furthermore, the broadcast receiving device 100 only needs to be equipped with a single broadcast signal input connector unit 100F3.

[0233] FIG. 7D shows an example of frequency conversion processing. In this example, frequency conversion processing is performed on a vertically polarized signal. Specifically, of the horizontally polarized signal and vertically polarized signal transmitted in the 470-710 MHz frequency band (corresponding to UHF channels 13-52), the frequency band of the vertically polarized signal is converted from 470-710 MHz to 770-1010 MHz. This processing allows signals transmitted using horizontally polarized and vertically polarized waves of the same frequency band to be simultaneously transmitted to broadcast receiving device 100 via a single coaxial cable 202T3 without mutual interference. Note that frequency conversion processing may also be performed on the horizontally polarized signal.

[0234] Furthermore, it is preferable that the frequency conversion process be performed on the signal transmitted in the secondary polarization depending on the result of referring to the primary signal identification in the TMCC information. As explained using Figure 5H, the signal transmitted in the primary polarization is more likely to include the current terrestrial digital broadcasting service than the signal transmitted in the secondary polarization. Therefore, in order to more preferably maintain compatibility with the current terrestrial digital broadcasting service, it is preferable to frequency convert the signal transmitted in the secondary polarization without frequency converting the signal transmitted in the primary polarization.

[0235] Furthermore, when a signal transmitted using the secondary polarization is frequency converted, it is desirable to set the frequency band of the converted signal using the secondary polarization higher than that of the signal transmitted using the primary polarization. This allows the broadcast receiving device 100 to perform an initial scan starting from the low frequency side and progressing to the high frequency side, so that signals transmitted using the primary polarization can be scanned before signals transmitted using the secondary polarization. This allows for more efficient processing, such as reflecting the settings from the initial scan of a current terrestrial digital broadcasting service in the settings from the initial scan of an advanced terrestrial digital broadcasting service.

[0236] Furthermore, the frequency conversion process may be performed on all physical channels used in the advanced terrestrial digital broadcasting service, or may be performed only on physical channels using signal transmission by a dual-polarized transmission method.

[0237] The frequency band after the frequency conversion process is preferably between 710 and 1032 MHz. That is, when simultaneously receiving terrestrial digital broadcasting services and BS / CS digital broadcasting services, it is conceivable to combine the broadcast signal of the terrestrial digital broadcasting service received by antenna 200T and the broadcast signal of the BS / CS digital broadcasting service received by antenna 200B and transmit the combined signal to broadcast receiving device 100 via a single coaxial cable. In this case, since the BS / CS-IF signal uses a frequency band of approximately 1032 to 2150 MHz, setting the frequency band after the frequency conversion process to between 710 and 1032 MHz makes it possible to avoid interference between horizontally polarized signals and vertically polarized signals, while also avoiding interference between the broadcast signal of the terrestrial digital broadcasting service and the broadcast signal of the BS / CS digital broadcasting service. Furthermore, when taking into consideration the reception of retransmitted broadcast signals by cable television (Community Antenna TV or Cable TV: CATV) stations, since the frequency band of 770 MHz or less (the band equivalent to UHF channel 62 or less) is used for television broadcast distribution by cable television stations, it is more preferable to set the frequency band after conversion by the frequency conversion process to between 770 and 1032 MHz, which exceeds the band equivalent to UHF channel 62.

[0238] Furthermore, it is preferable to set the bandwidth of the region between the frequency band before and after conversion (part a in the figure) by the frequency conversion process to be an integer multiple of the bandwidth of one physical channel (6 MHz). This has the advantage of facilitating frequency setting control when, for example, the broadcast receiving device 100 performs frequency scanning of broadcast signals in the frequency band before and after conversion in a batch.

[0239] As described above, the dual-polarized transmission system according to the embodiment of the present invention uses both horizontally polarized and vertically polarized signals to transmit 4K broadcast programs. Therefore, in order to correctly play back 4K broadcast programs, the receiving side needs to correctly identify the combination of physical channels of horizontally polarized and vertically polarized broadcast signals. Even when frequency conversion processing is performed and horizontally polarized and vertically polarized broadcast signals for the same physical channel are input to the receiving device as signals in different frequency bands, the broadcast receiving device 100 according to the embodiment can correctly identify the combination of horizontally polarized and vertically polarized broadcast signals for the same physical channel by appropriately referencing parameters (e.g., main signal identification and physical channel number identification) of the TMCC information shown in Figures 5F to 5J. This allows the broadcast receiving device 100 according to the embodiment to properly receive, demodulate, and play back 4K broadcast programs.

[0240] Although the examples of Figures 7B, 7C, and 7D all describe cases where horizontal polarization is the main polarization, the horizontal polarization and vertical polarization may be reversed depending on the application.

[0241] As mentioned above, the terrestrial digital broadcasting waves transmitted by the dual-polarized transmission method described above can be received and played back by the second tuner / demodulation unit 130T of the broadcast receiving device 100, but can also be received by the first tuner / demodulation unit 130C of the broadcast receiving device 100. When the terrestrial digital broadcasting waves are received by the first tuner / demodulation unit 130C, the broadcast signals of the terrestrial digital broadcasting waves that are transmitted in the layer of the advanced terrestrial digital broadcasting service are ignored, but the broadcast signals that are transmitted in the layer of the current terrestrial digital broadcasting service are played back.

[0242] <Pass-through transmission method for advanced terrestrial digital broadcasting service> The broadcast receiving device 100 is capable of receiving signals transmitted by a pass-through transmission method. The pass-through transmission method is a method in which a broadcast signal received by a cable television station or the like is sent to a CATV distribution system using the same signal method as the original, or after frequency conversion.

[0243] The pass-through method includes (1) a method in which the transmission signal band of each terrestrial digital broadcasting signal output from the terrestrial receiving antenna is extracted and its level is adjusted, and the signal is transmitted to the CATV facility at the same frequency as the transmission signal frequency, and (2) a method in which the transmission signal band of each terrestrial digital broadcasting signal output from the terrestrial receiving antenna is extracted and its level is adjusted, and the signal is transmitted to the CATV facility at a frequency of the VHF band, MID band, SHB band, or UHF band set by the CATV facility manager. The equipment constituting the receiving amplifier for performing signal processing of the first method, or the equipment constituting the receiving amplifier and frequency converter for performing signal processing of the second method, is an OFDM signal processor (OFDM Signal Processor: OFDM-SP).

[0244] Figure 7E shows an example of a system configuration in which the first pass-through transmission method is applied to an advanced terrestrial digital broadcasting service using a dual-polarization transmission method. Figure 7E also shows a cable television station's head-end equipment 400C and a broadcast receiving device 100. Figure 7F also shows an example of the frequency conversion process used in this case. The notation (H / V) in Figure 7F indicates a broadcast signal state in which both a horizontally polarized broadcast signal and a vertically polarized broadcast signal exist in the same frequency band, with (H) indicating a horizontally polarized broadcast signal and (V) indicating a vertically polarized broadcast signal. The notations in the following Figures 7H and 7I have similar meanings.

[0245] When the pass-through transmission method described above is applied to an advanced terrestrial digital broadcasting service using a dual-polarization transmission method according to an embodiment of the present invention, the broadcast signal transmitted using horizontal polarization undergoes signal band extraction and level adjustment in the cable television station's head-end equipment 400C, and is then transmitted at the same frequency as the transmission signal frequency. Meanwhile, the broadcast signal transmitted using vertical polarization undergoes signal band extraction and level adjustment in the cable television station's head-end equipment 400C, and is then transmitted after undergoing a frequency conversion process similar to that described in FIG. 7D (a process of converting the vertically polarized broadcast signal to a frequency band higher than the 470-770 MHz frequency band corresponding to UHF channels 13-62). This process eliminates overlap between the frequency bands of the horizontally polarized broadcast signal and the vertically polarized broadcast signal, enabling signal transmission over a single coaxial cable (or optical fiber cable). The transmitted signal can be received by the broadcast receiving device 100 according to this embodiment. The process of receiving and demodulating the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization contained in the signal in the broadcast receiving device 100 of this embodiment is the same as that described in Figure 7D, so a repeated description will be omitted.

[0246] Fig. 7G shows an example of a system configuration in which the second pass-through transmission method is applied to an advanced terrestrial digital broadcasting service using a dual-polarization transmission method. Fig. 7G shows a cable television station's head-end facility 400C and a broadcast receiving device 100. Fig. 7H also shows an example of the frequency conversion process that is performed in this case.

[0247] When the pass-through transmission method of the second method is applied to the advanced terrestrial digital broadcasting service using the dual-polarization transmission method of the embodiment of the present invention, the broadcast signal transmitted using horizontal polarization undergoes signal band extraction and level adjustment in the cable television station's head-end equipment 400C, and undergoes frequency conversion to the frequency set by the CATV facility manager before being transmitted. On the other hand, the broadcast signal transmitted using vertical polarization undergoes signal band extraction and level adjustment in the cable television station's head-end equipment 400C, and undergoes frequency conversion similar to that described in Figure 7D (processing to convert the vertically polarized broadcast signal to a frequency band higher than the 470-770 MHz frequency band corresponding to UHF channels 13-62) before being transmitted. The frequency conversion process shown in Figure 7H differs from that shown in Figure 7F in that the broadcast signal transmitted using horizontal polarization is not limited to the 470-770 MHz frequency band corresponding to UHF channels 13-62, but is expanded to include lower frequency bands, resulting in a relocation to the 90-770 MHz range. This process prevents the frequency bands of the broadcast signals transmitted with horizontal polarization and the broadcast signals transmitted with vertical polarization from overlapping, making it possible to transmit the signals using a single coaxial cable (or optical fiber cable). The transmitted signals can be received by the broadcast receiving device 100 of this embodiment. The process of receiving and demodulating the broadcast signals transmitted with horizontal polarization and the broadcast signals transmitted with vertical polarization contained in the signal in the broadcast receiving device 100 of this embodiment is the same as that described in Figure 7D, so a repeated description will be omitted.

[0248] As another variation of the frequency conversion process of the cable television station head-end equipment 400C in Figure 7G, the broadcast signal at the pass-through output after frequency conversion may be changed from the state shown in Figure 7H to the state shown in Figure 7I. In this case, signal band extraction and level adjustment may be performed on both the horizontally polarized broadcast signal and the vertically polarized broadcast signal, and the signal may be frequency converted to the frequency set by the CATV facility manager before being transmitted. In the example of Figure 7I, frequency conversion is performed to rearrange both the horizontally polarized broadcast signal and the vertically polarized broadcast signal within the 90 to 770 MHz range (VHFch1 to UHFch62). Since the frequency band beyond UHFch62 is not used, the frequency band utilization efficiency of the broadcast signal is higher than that of Figure 7H.

[0249] Furthermore, because the band for rearranging broadcast signals is wider than the 470 to 710 MHz frequency band, which is the UHF band of channels 13 to 52 during antenna reception, it is also possible to alternately rearrange broadcast signals transmitted with horizontal polarization and broadcast signals transmitted with vertical polarization, as shown in the example of Figure 7I. In this case, as shown in the example of Figure 7I, if pairs of broadcast signals transmitted with horizontal polarization and broadcast signals transmitted with vertical polarization that were on the same physical channel during antenna reception are alternately rearranged in the order of the physical channels during antenna reception, when the broadcast receiving device 100 of this embodiment performs an initial scan from the low frequency side, it can proceed with initial setup of pairs of broadcast signals transmitted with horizontal polarization and broadcast signals transmitted with vertical polarization that were originally on the same physical channel in units of the originally same physical channel, thereby allowing for efficient initial scanning.

[0250] Note that the examples of Figures 7E, 7F, 7G, 7H, and 7I all describe cases where horizontal polarization is the main polarization, but depending on the operation, the horizontal polarization and vertical polarization may be reversed.

[0251] As described above, the terrestrial digital broadcasting waves of the dual-polarized transmission system using the pass-through transmission method described above can be received and played back by the second tuner / demodulation unit 130T of the broadcast receiving device 100, but can also be received by the first tuner / demodulation unit 130C of the broadcast receiving device 100. When the terrestrial digital broadcasting waves are received by the first tuner / demodulation unit 130C, the broadcast signals of the terrestrial digital broadcasting waves that are transmitted in the layer of the advanced terrestrial digital broadcasting service are ignored, but the broadcast signals that are transmitted in the layer of the current terrestrial digital broadcasting service are played back.

[0252] [Transmission Method 2 for Advanced Terrestrial Digital Broadcasting Services] In order to realize 4K broadcasting while maintaining the viewing environment of current terrestrial digital broadcasting services, a single polarization transmission method will be described as an example of an advanced terrestrial digital broadcasting service transmission method according to an embodiment of the present invention, which is different from the above-described method. The single polarization transmission method according to an embodiment of the present invention is a method that shares some specifications with the current terrestrial digital broadcasting method, and is a method that transmits data using SISO (Single-Input Single-Output) technology using either a horizontally polarized signal or a vertically polarized signal. For example, 13 segments within a band of approximately 6 MHz, which corresponds to one physical channel, are divided, and 8 segments are assigned to the transmission of 2K broadcast programs, 4 segments to the transmission of 4K broadcast programs, and 1 segment to be used for mobile reception. Note that 2K broadcast programs maintain image quality by optimizing the latest MPEG-2 Video compression technology, making them receivable on current television receivers, while 4K broadcast programs use HEVC compression technology or VVC compression technology, which are more efficient than MPEG-2 Video, and furthermore, image quality is ensured by adopting technologies such as modulation multi-value and NUC. Note that the number of segments assigned to each broadcast may differ from that described above.

[0253] 7J shows an example of a single-polarized wave transmission method for an advanced terrestrial digital broadcasting service according to an embodiment of the present invention. A frequency band of 470 to 710 MHz is used for transmitting broadcast waves for the terrestrial digital broadcasting service. There are 40 physical channels in this frequency band, ranging from 13 to 52 ch, each with a bandwidth of 6 MHz. In the single-polarized wave transmission method according to an embodiment of the present invention, transmission of a 2K broadcasting service and transmission of a 4K broadcasting service are simultaneously performed within one physical channel.

[0254] FIG. 7J shows two examples of 13-segment allocation, (1) and (2). In example (1), 4K broadcast programs are transmitted using segments 1 to 4 (layer B). 2K broadcast programs are transmitted using segments 5 to 12 (layer C). The 4K broadcast programs transmitted using layer B and the 2K broadcast programs transmitted using layer C may be simulcasts in which the same broadcast programs are transmitted at different resolutions, or may transmit broadcast programs with different contents. Example (2) is a variation of example (1). In example (2), 2K broadcast programs are transmitted using segments 1 to 8 (layer B). 4K broadcast programs are transmitted using segments 9 to 12 (layer C).

[0255] Figure 7K shows an example of the configuration of a broadcasting system for an advanced terrestrial digital broadcasting service using a single-polarized wave transmission method according to an embodiment of the present invention. This shows both the transmitting system and the receiving system for an advanced terrestrial digital broadcasting service using a single-polarized wave transmission method. The configuration of the broadcasting system for an advanced terrestrial digital broadcasting service using a single-polarized wave transmission method is basically the same as the configuration of the broadcasting system shown in Figure 1, except that the radio tower 300S, which is a broadcasting station facility, is a single-polarized wave transmitting antenna capable of transmitting either a horizontally polarized signal or a vertically polarized signal. Also, in the example of Figure 7K, only the tuning / detection unit 131H of the second tuner / demodulation unit 130T of the broadcast receiving device 100 is shown, and other operating units are omitted.

[0256] The single polarized signal transmitted from the radio tower 300S is received by the antenna 200S, which is a single polarized receiving antenna, and is input to the tuning / detection unit 131H from the connector 100F3 via the coaxial cable 202S. An F-type connector is generally used as the connector connecting the antenna (coaxial cable) to the television receiver. In the configuration of a broadcasting system for an advanced terrestrial digital broadcasting service using the single polarized transmission method, the antenna 200S and the broadcast receiving device 100 can be connected with a single coaxial cable 202S, which is preferable because it does not require frequency conversion processing (conversion unit).

[0257] As mentioned above, the terrestrial digital broadcasting waves transmitted by the single polarization transmission method described above can be received and played back by the second tuner / demodulation unit 130T of the broadcast receiving device 100, but can also be received by the first tuner / demodulation unit 130C of the broadcast receiving device 100. When the terrestrial digital broadcasting waves are received by the first tuner / demodulation unit 130C, the broadcast signals of the terrestrial digital broadcasting waves that are transmitted in the layer of the advanced terrestrial digital broadcasting service are ignored, but the broadcast signals that are transmitted in the layer of the current terrestrial digital broadcasting service are played back.

[0258] As described above, in broadcast receiving device 100, among the terrestrial digital broadcasting waves transmitted by a single polarization transmission method, broadcast signals transmitted in the hierarchical layer of the current terrestrial digital broadcasting service (the hierarchical layer that transmits 2K broadcasting in FIG. 7J) can also be received by first tuner / demodulator 130C. Therefore, by using a double tuner configuration that simultaneously uses second tuner / demodulator 130T and first tuner / demodulator 130C, it becomes possible to simultaneously receive / play back broadcast signals transmitted in the hierarchical layer of the advanced terrestrial digital broadcasting service and broadcast signals transmitted in the hierarchical layer of the current terrestrial digital broadcasting service.

[0259] Figure 7L shows an example of the configuration of a broadcasting system for an advanced terrestrial digital broadcasting service using a single-polarized transmission method according to an embodiment of the present invention, which is a dual tuner configuration. This shows both the transmitting system and the receiving system for an advanced terrestrial digital broadcasting service using a single-polarized transmission method. The configuration of a broadcasting system for an advanced terrestrial digital broadcasting service using a single-polarized transmission method is basically the same as the configuration of the broadcasting system shown in Figure 1, except that the broadcasting station's equipment, the radio tower 300S, is a single-polarized transmitting antenna capable of transmitting either a horizontally polarized signal or a vertically polarized signal. Also, in the example of Figure 7L, the broadcast receiving device 100 is shown with only the tuning / detection unit 131C of the first tuner / demodulation unit 130C and the tuning / detection unit 131H of the second tuner / demodulation unit 130T excerpted, and the other operating units are omitted.

[0260] The single polarized signal transmitted from radio tower 300S is received by antenna 200S, which is a single polarized receiving antenna, and input to broadcast receiving device 100 from connector unit 100F3 via coaxial cable 202S. The single polarized signal input to broadcast receiving device 100 is split and input to tuning / detection unit 131C and tuning / detection unit 131H, respectively. Tuning / detection unit 131C performs tuning / detection processing on the broadcast waves of the current terrestrial digital broadcasting service, while tuning / detection unit 131H performs tuning / detection processing on the broadcast waves of the advanced terrestrial digital broadcasting service.

[0261] With this configuration, in a broadcasting system in which the current terrestrial digital broadcasting service and the advanced terrestrial digital broadcasting service are provided, it becomes possible to simultaneously receive the current terrestrial digital broadcasting service and the advanced terrestrial digital broadcasting service. In particular, efficient processing is possible in the channel setting unit, etc. Note that the current terrestrial digital broadcasting service and the advanced terrestrial digital broadcasting service may be transmitted using the same physical channel, or may be transmitted using different physical channels. Furthermore, the current terrestrial digital broadcasting service and the advanced terrestrial digital broadcasting service may or may not be a pair of simulcast services.

[0262] 7L illustrates a case where an advanced terrestrial digital broadcasting service is received using a single-polarized transmission scheme, but a similar configuration can also be applied to a case where an advanced terrestrial digital broadcasting service is received using a dual-polarized transmission scheme. In this case, the dual-polarized signal received by antenna 200T, which is a dual-polarized receiving antenna, and input to broadcast receiving device 100 from connector 100F3 via converter 201T is split and input to tuning / detection units 131C, 131H, and 131V, respectively. Tuning / detection unit 131C performs tuning / detection processing on the broadcast waves of the current terrestrial digital broadcasting service transmitted as either a horizontally polarized signal or a vertically polarized signal, and tuning / detection units 131H and 131V perform tuning / detection processing on the broadcast waves of the advanced terrestrial digital broadcasting service transmitted as both a horizontally polarized signal and a vertically polarized signal.

[0263] [Transmission Method 3 for Advanced Terrestrial Digital Broadcasting Service] In order to realize 4K broadcasting while maintaining the viewing environment of the current terrestrial digital broadcasting service, a hierarchical division multiplexing transmission method will be described as an example of an advanced terrestrial digital broadcasting service transmission method according to an embodiment of the present invention, which is different from the above. The hierarchical division multiplexing transmission method according to an embodiment of the present invention is a method that shares some specifications with the current terrestrial digital broadcasting method. For example, a 4K broadcasting service with a low signal level is multiplexed and transmitted on the same channel as the broadcasting wave of the current 2K broadcasting service. Note that the 2K broadcasting is received as usual by suppressing the reception level of the 4K broadcasting to below the required C / N. For 4K broadcasting, while expanding the transmission capacity by modulation multi-level or the like, the 2K broadcasting wave is canceled using reception technology compatible with LDM (hierarchical division multiplexing) technology, and reception is performed using the remaining 4K broadcasting wave.

[0264] FIG. 8A shows an example of a layer division multiplexing transmission method for an advanced terrestrial digital broadcasting service according to an embodiment of the present invention. The upper layer is configured with a modulated wave for current 2K broadcasting, and the lower layer is configured with a modulated wave for 4K broadcasting. The upper and lower layers are multiplexed and output as a composite wave in the same frequency band. For example, the upper layer may use a modulation method such as 64QAM, and the lower layer may use a modulation method such as 256QAM. The 2K broadcast program transmitted using the upper layer and the 4K broadcast program transmitted using the lower layer may be a simulcast in which the same broadcast program is transmitted at different resolutions, or may transmit broadcast programs with different contents. Here, the upper layer is transmitted at high power, and the lower layer is transmitted at low power. The difference (power difference) between the modulated wave level of the upper layer and the modulated wave level of the lower layer is called the injection level (IL), which is a value set by the broadcasting station. The injection level is generally expressed as a logarithmic relative ratio (dB) of the difference in modulated wave level (difference in power).

[0265] 8B shows an example of the configuration of a broadcasting system for an advanced terrestrial digital broadcasting service using a hierarchical division multiplexing transmission method according to an embodiment of the present invention. The configuration of the broadcasting system for an advanced terrestrial digital broadcasting service using a hierarchical division multiplexing transmission method is basically the same as the configuration of the broadcasting system shown in FIG. 1, except that the radio tower 300L, which is a broadcasting station facility, is a transmitting antenna that transmits a broadcast signal that multiplexes 2K broadcasts on an upper layer and 4K broadcasts on a lower layer. Also, in the example of FIG. 8B, only the tuning / detection unit 131L of the third tuner / demodulation unit 130L of the broadcast receiving device 100 is shown, and other operating units are omitted.

[0266] The broadcast signal received by the antenna 200L is input from the connector 100F4 to the tuning / detection unit 131L via the converter 201L and the coaxial cable 202L. In the above configuration, when the broadcast signal is transmitted from the antenna 200L to the broadcast receiving device 100, the converter 201L may perform frequency conversion and amplification processing on the broadcast signal, as shown in FIG. 8C . That is, if the antenna 200L is installed on the roof of an apartment building or the like and the broadcast signal is transmitted to the broadcast receiving device 100 in each room via a long coaxial cable 202L, the broadcast signal may be attenuated, potentially causing a problem in which the tuning / detection unit 131L is unable to properly receive 4K broadcast waves, particularly those in the lower hierarchical layers.

[0267] To prevent the above-mentioned problems, the converter 201L performs frequency conversion and amplification on the 4K broadcast signal on the lower hierarchical layer. The frequency conversion and amplification converts the frequency band of the 4K broadcast signal on the lower hierarchical layer from a frequency band of 470 to 710 MHz (corresponding to UHF channels 13 to 52) to, for example, a frequency band of 770 to 1010 MHz, which exceeds the frequency band corresponding to UHF channel 62. Furthermore, the converter 201L amplifies the 4K broadcast signal on the lower hierarchical layer to a signal level at which the effects of cable attenuation are not a problem. By performing such processing, it is possible to avoid interference between the 2K and 4K broadcast signals while also avoiding the effects of broadcast signal attenuation during transmission over the coaxial cable. Note that the converter 201L and frequency conversion and amplification may be unnecessary if the effects of attenuation are not a problem, such as when the length of the coaxial cable 202L is short.

[0268] 8D , the tuning / detection unit included in the third tuner / demodulation unit 130L of the broadcast receiving device 100 may be configured with a tuning / detection unit 131L1 that performs processing such as tuning / detection on modulated waves of an upper layer (2K broadcast) and a tuning / detection unit 131L2 that performs processing such as tuning / detection on modulated waves of a lower layer (4K broadcast). This configuration makes it possible to simultaneously perform processing such as tuning / detection on 2K broadcast signals and 4K broadcast signals sent from broadcast stations using the same physical channel for signals that have been frequency converted and amplified by the conversion unit 201L, thereby enabling processing that is particularly suitable for simultaneous broadcasting, etc.

[0269] Furthermore, it is preferable that the frequency band after conversion by the frequency conversion amplification process be between 710 and 1032 MHz, which exceeds the band corresponding to UHF channel 52, or between 770 and 1032 MHz, which exceeds the band corresponding to UHF channel 62 (in the case of retransmission by a cable television station, etc.); it is preferable that the bandwidth of the region between the frequency band before conversion by the frequency conversion amplification process and the frequency band after conversion be set to be an integer multiple of the bandwidth of one physical channel (6 MHz); and the frequency conversion amplification process may be performed only on physical channels that use signal transmission by a hierarchical division multiplexing transmission method. These are all the same as the explanation of this embodiment related to frequency conversion already explained, so further explanation will be omitted.

[0270] The broadcast receiving device 100 of this embodiment can identify whether a received broadcast signal is a broadcast signal transmitted on a lower layer or an upper layer using the upper / lower layer identification bit of the TMCC information described in FIG. 5H. The broadcast receiving device 100 of this embodiment can also identify whether a received broadcast signal is a broadcast signal that has been frequency converted after antenna reception using the frequency conversion process identification bit of the TMCC information described in FIG. 5F. The broadcast receiving device 100 of this embodiment can also identify whether a received broadcast signal transmits a 4K program on a lower layer using the 4K signal transmission layer identification bit of the TMCC information described in FIG. 5I. While these identification processes can be performed by demodulating the data carrier and referencing the control information contained in the stream, this requires demodulation of the data carrier, which complicates the process. Identifying by referring to the parameters of the TMCC information described above is simpler and faster, and therefore can speed up the initial scan of the broadcast receiving device 100, for example.

[0271] As already explained, the channel selection / detection unit 131L of the third tuner / demodulation unit 130L of the broadcast receiving device 100 according to an embodiment of the present invention has a receiving function compatible with LDM (Layer Division Multiplexing) technology, and therefore the conversion unit 201L shown in Figure 8B is not necessarily required between the antenna 200L and the broadcast receiving device 100.

[0272] As mentioned above, the terrestrial digital broadcasting waves transmitted by the hierarchical division multiplexing transmission method described above can be received and played back by the third tuner / demodulation unit 130L of the broadcast receiving device 100, but can also be received by the first tuner / demodulation unit 130C of the broadcast receiving device 100. When the terrestrial digital broadcasting waves are received by the first tuner / demodulation unit 130C, the broadcast signals of the terrestrial digital broadcasting waves that are transmitted in the hierarchical layer of the advanced terrestrial digital broadcasting service are ignored, but the broadcast signals that are transmitted in the hierarchical layer of the current terrestrial digital broadcasting service are played back.

[0273] [MPEG-2 TS Format] The broadcasting system of this embodiment is compatible with MPEG-2 TS, which is used in current terrestrial digital broadcasting services and the like, as a media transport format for transmitting data such as video and audio. Specifically, the format of the stream transmitted by the OFDM transmission wave of FIG. 4D(1) is MPEG-2 TS, and the format of the stream transmitted by the OFDM transmission wave of FIG. 4D(2) and FIG. 4D(3) at the layer where the current terrestrial digital broadcasting service is transmitted is MPEG-2 TS. Furthermore, the format of the stream obtained by demodulating the transmission wave with the first tuner / demodulator 130C of the broadcast receiving device 100 of FIG. 2 is MPEG-2 TS. Furthermore, the format of the stream obtained by demodulating the transmission wave with the second tuner / demodulator 130T, corresponding to the layer where the current terrestrial digital broadcasting service is transmitted, is MPEG-2 TS. Similarly, among the streams obtained by demodulating the transmission wave in the third tuner / demodulator 130L, the format of the stream corresponding to the layer on which the current terrestrial digital broadcasting service is transmitted is MPEG-2 TS.

[0274] MPEG-2 TS is characterized by multiplexing video, audio, and other components that make up a program, along with control signals and a clock, into a single packet stream. Because the clock is also included in a single packet stream, it is suitable for transmitting a single piece of content over a single transmission path with guaranteed transmission quality, and is therefore adopted by many current digital broadcasting systems. It also enables two-way communication via two-way networks such as fixed and mobile networks, and is compatible with broadcasting and communication integration systems that integrate digital broadcasting services with functions that utilize broadband networks, such as the acquisition of additional content via broadband networks, computational processing in server devices, and presentation processing in collaboration with mobile terminal devices.

[0275] 9A shows an example of a protocol stack for a transmission signal in a broadcasting system using MPEG-2 TS. In MPEG-2 TS, PSI, SI, and other control signals are transmitted in section format.

[0276] [Control signals for broadcasting systems using the MPEG-2 TS format] The control information for the MPEG-2 TS format includes tables used primarily for program sequence information and tables used for purposes other than program sequence information. Tables are transmitted in section format, and descriptors are placed within the tables.

[0277] <Tables used in program sequence information> Fig. 9B shows a list of tables used in program sequence information for an MPEG-2 TS broadcasting system. In this embodiment, the following tables are used as the program sequence information.

[0278] (1) PAT (Program Association Table) (2) CAT (Conditional Access Table) (3) PMT (Program Map Table) (4) NIT (Network Information Table) (5) SDT (Service Description Table) (6) BAT (Bouquet Association Table) (7) EIT (Event Information Table) (8) RST (Running Status Table) (9) TDT (Time and Date Table) (10) TOT (Time Offset Table)

[0279] (11) LIT (Local Event Information Table) (12) ERT (Event Relation Table) (13) ITT (Index Transmission Table) (14) PCAT (Partial Content Announcement Table) (15) ST (Stuffing Table) (16) BIT (Broadcaster Information Table) (17) NBIT (Network Board Information Table) (18) LDT (Linked Description Table) (19) AMT (Address Map Table) (20) INT (IP / MAC Notification Table) (21) Tables set by the operator

[0280] <Tables used in digital broadcasting> Fig. 9C shows a list of tables used for purposes other than program sequence information in an MPEG-2 TS broadcasting system. In this embodiment, the following tables are used for purposes other than program sequence information.

[0281] (1) ECM (Entitlement Control Message) (2) EMM (Entitlement Management Message) (3) DCT (Download Control Table) (4) DLT (Download Table) (5) DIT (Discontinuity Information Table) (6) SIT (Selection Information Table) (7) SDTT (Software Download Trigger Table) (8) CDT (Common Data Table) (9) DSM-CC Section (10) AIT (Application Information Table) (11) DCM (Download Control Message) (12) DMM (Download Management Message) (13) Tables set by the operator

[0282] <Descriptors used in program service information> Figures 9D, 9E, and 9F show a list of descriptors used in program service information for MPEG-2 TS broadcasting systems. In this embodiment, the following descriptors are used in the program service information.

[0283] (1) Conditional Access Descriptor (2) Copyright Descriptor (3) Network Name Descriptor (4) Service List Descriptor (5) Stuffing Descriptor (6) Satellite Delivery System Descriptor (7) Terrestrial Delivery System Descriptor (8) Bouquet Name Descriptor (9) Service Descriptor (10) Country Availability Descriptor

[0284] (11) Linkage Descriptor (12) NVOD Reference Descriptor (13) Time Shifted Service Descriptor (14) Short Event Descriptor (15) Extended Event Descriptor (16) Time Shifted Event Descriptor (17) Component Descriptor (18) Mosaic Descriptor (19) Stream Identifier Descriptor (20) CA Identifier Descriptor

[0285] (21) Content Descriptor (22) Parental Rating Descriptor (23) Hierarchical Transmission Descriptor (24) Digital Copy Control Descriptor (25) Emergency Information Descriptor (26) Data Component Descriptor (27) System Management Descriptor (28) Local Time Offset Descriptor (29) Audio Component Descriptor (30) Target Region Descriptor

[0286] (31) Hyperlink Descriptor (32) Data Content Descriptor (33) Video Decode Control Descriptor (34) Basic Local Event Descriptor (35) Reference Descriptor (36) Node Relation Descriptor (37) Short Node Information Descriptor (38) STC Reference Descriptor (39) Partial Reception Descriptor (40) Series Descriptor

[0287] (41) Event Group Descriptor (42) SI Parameter Descriptor (43) Broadcaster Name Descriptor (44) Component Group Descriptor (45) SI Prime TS Descriptor (46) Board Information Descriptor (47) LDT Linkage Descriptor (48) Connected Transmission Descriptor (49) TS Information Descriptor (50) Extended Broadcaster Descriptor

[0288] (51) Logo Transmission Descriptor (52) Content Availability Descriptor (53) Carousel Compatible Composite Descriptor (54) Conditional Playback Descriptor (55) AVC Video Descriptor (56) AVC Timing and HRD Descriptor (57) Service Group Descriptor (58) MPEG-4 Audio Descriptor (59) MPEG-4 Audio Extension Descriptor (60) Registration Descriptor

[0289] (61) Data Broadcast Id Descriptor (62) Access Control Descriptor (63) Area Broadcasting Information Descriptor (64) Material Information Descriptor (65) HEVC Video Descriptor (66) Hierarchy Descriptor (67) Hybrid Information Descriptor (68) Scrambler Descriptor (69) Descriptor set by the operator

[0290] <Descriptors used in digital broadcasting> Fig. 9G shows a list of descriptors used in addition to program service information in an MPEG-2 TS broadcasting system. In this embodiment, the following descriptors are used in addition to program service information.

[0291] (1) Partial Transport Stream Descriptor (2) Network Identification Descriptor (3) Partial Transport Stream Time Descriptor (4) Download Content Descriptor (5) CA EMM TS Descriptor (6) CA Contract Information Descriptor (7) CA Service Descriptor (8) Carousel Identifier Descriptor (9) Association Tag Descriptor (10) Deferred Association Tag Descriptor (11) Network Download Content Descriptor (12) Download Protection Descriptor (13) CA Startup Descriptor (14) Descriptor set by the operator

[0292] <Descriptors used in INT> Fig. 9H shows a list of descriptors used in INT in an MPEG-2 TS broadcasting system. In this embodiment, the following descriptors are used in INT. Note that the descriptors used in the above-mentioned program service information and descriptors used for purposes other than program service information are not used in INT.

[0293] (1) Target Smartcard Descriptor (2) Target IP Address Descriptor (3) Target IPv6 Address Descriptor (4) IP / MAC Platform Name Descriptor (5) IP / MAC Platform Provider Name Descriptor (6) IP / MAC Stream Location Descriptor (7) Descriptor set by the operator

[0294] <Descriptors used in the AIT> Fig. 9I shows a list of descriptors used in the AIT of an MPEG-2 TS broadcasting system. In this embodiment, the following descriptors are used in the AIT. Note that the descriptors used in the program sequence information and descriptors used for purposes other than the program sequence information are not used in the INT.

[0295] (1) Application Descriptor (2) Transport Protocol Descriptor (3) Simple Application Location Descriptor (4) Application Boundary and Permission Descriptor (5) Autostart Priority Descriptor (6) Cache Control Info Descriptor (7) Randomized Latency Descriptor (8) External Application Control Descriptor (9) Playback Application Descriptor (10) Simple Playback Application Location Descriptor (11) Application Expiration Descriptor (12) Descriptors set by the operator

[0296] [MMT Method] The broadcasting system of this embodiment can also support the MMT method as a media transport method for transmitting data such as video and audio. Specifically, among the OFDM transmission waves shown in FIGS. 4D(2) and 4D(3), the method of the stream transmitted at the layer where the advanced terrestrial digital broadcasting service is transmitted is, in principle, the MMT method. Furthermore, among the streams obtained by demodulating the transmission wave using the second tuner / demodulation unit 130T of the broadcast receiving device 100 shown in FIG. 2, the method of the stream corresponding to the layer where the advanced terrestrial digital broadcasting service is transmitted is, in principle, the MMT method. Similarly, among the streams obtained by demodulating the transmission wave using the third tuner / demodulation unit 130L, the method of the stream corresponding to the layer where the advanced terrestrial digital broadcasting service is transmitted is, in principle, the MMT method. As a variant, an MPEG-2 TS stream may be used for the advanced terrestrial digital broadcasting service. Furthermore, the method of the stream obtained by demodulating the transmission wave using the fourth tuner / demodulation unit 130B is the MMT method.

[0297] The MMT method is a newly developed media transport method in response to the limitations of the MPEG-2 TS method in dealing with changes in the content distribution environment, such as the recent diversification of content, the diversification of devices that use content, the diversification of transmission paths for content distribution, and the diversification of content storage environments.

[0298] The video and audio signals of a broadcast program are coded as MFU (Media Fragment Unit) / MPU (Media Processing Unit), placed on an MMTP (MMT Protocol) payload, packetized as MMTP packets, and transmitted in IP packets. Signals of data content and subtitles related to the broadcast program are also in MFU / MPU format, placed on an MMTP payload, packetized as MMTP packets, and transmitted in IP packets.

[0299] For transmitting MMTP packets, UDP / IP (User Datagram Protocol / Internet Protocol) is used on the broadcast transmission path, and UDP / IP or TCP / IP (Transmission Control Protocol / Internet Protocol) is used on the communication line. In addition, a TLV multiplexing method may be used on the broadcast transmission path for efficient transmission of IP packets.

[0300] FIG. 10A shows the MMT protocol stack on a broadcast transmission path. FIG. 10B shows the MMT protocol stack on a communication line. The MMT method provides a mechanism for transmitting two types of control information: MMT-SI and TLV-SI. MMT-SI is control information that indicates the configuration of a broadcast program, etc. It is formatted as an MMT control message, placed on an MMTP payload, packetized as an MMTP packet, and transmitted in an IP packet. TLV-SI is control information related to multiplexing of IP packets, and provides information for channel selection and information corresponding to IP addresses and services.

[0301] [Control Signals in Broadcasting Systems Using the MMT Method] As mentioned above, the MMT method provides TLV-SI and MMT-SI as control information. TLV-SI consists of tables and descriptors. Tables are transmitted in section format, and descriptors are placed within the tables. MMT-SI consists of three layers: messages that store tables and descriptors, tables with elements and attributes that indicate specific information, and descriptors that indicate more detailed information.

[0302] <Tables used in TLV-SI> Figure 10C shows a list of tables used in TLV-SI of the MMT broadcasting system. In this embodiment, the following tables are used as TLV-SI tables. In addition, tables synonymous with the tables shown in Figures 9B and 9C may also be used.

[0303] (1) Network Information Table for TLV (2) Address Map Table (3) Table set by the operator

[0304] <Descriptors used in TLV-SI> Figure 10D shows a list of descriptors used in TLV-SI of an MMT broadcasting system. In this embodiment, the following descriptors are used as TLV-SI descriptors. In addition, descriptors synonymous with the descriptors shown in Figures 9D, 9E, 9F, 9G, 9H, and 9I may also be used.

[0305] (1) Service List Descriptor (2) Satellite Delivery System Descriptor (3) System Management Descriptor (4) Network Name Descriptor (5) Remote Control Key Descriptor (6) Descriptors set by the carrier

[0306] <Messages used in MMT-SI> Fig. 10E shows a list of messages used in MMT-SI in the MMT broadcasting system. In this embodiment, the following messages are used as MMT-SI messages.

[0307] (1) PA (Package Access) message (2) M2 section message (3) CA message (4) M2 short section message (5) Data transmission message (6) Message set by the carrier

[0308] <Tables used in MMT-SI> Figure 10F shows a list of tables used in MMT-SI of an MMT broadcasting system. In this embodiment, the following tables are used as MMT-SI tables. In addition, tables synonymous with the tables shown in Figures 9B and 9C may also be used.

[0309] (1) MPT (MMT Package Table) (2) PLT (Package List Table) (3) LCT (Layout Configuration Table) (4) ECM (Entitlement Control Message) (5) EMM (Entitlement Management Message) (6) CAT (MH) (Conditional Access Table (MH)) (7) DCM (Download Control Message) (8) DMM (Download Management Message) (9) MH-EIT (MH-Event Information Table) (10) MH-AIT (MH-Application Information Table)

[0310] (11) MH-BIT (MH-Broadcaster Information Table) (12) MH-SDTT (MH-Software Download Trigger Table) (13) MH-SDT (MH-Service Description Table) (14) MH-TOT (MH-Time Offset Table) (15) MH-CDT (MH-Common Data Table) (16) MH-DIT (MH-Discontinuity Information Table) (17) MH-SIT (MH-Selection Information Table) (18) DDM Table (Data Directory Management Table) (19) DAM Table (Data Asset Management Table) (20) DCC Table (Data Content Configuration Table) (21) EMT (Event Message Table) (22) Tables set by the operator

[0311] <Descriptors used in MMT-SI> Figures 10G, 10H, and 10I show a list of descriptors used in MMT-SI in an MMT broadcasting system. In this embodiment, the following descriptors are used as MMT-SI descriptors. In addition, descriptors synonymous with the descriptors shown in Figures 9D, 9E, 9F, 9G, 9H, and 9I may also be used.

[0312] (1) Asset Group Descriptor (2) Event Package Descriptor (3) Background Color Descriptor (4) MPU Presentation Region Descriptor (5) MPU Timestamp Descriptor (6) Dependency Descriptor (7) Access Control Descriptor (8) Scrambler Descriptor (9) Message Authentication Method Descriptor (10) Emergency Information Descriptor

[0313] (11) MH-MPEG-4 Audio Descriptor (12) MH-MPEG-4 Audio Extension Descriptor (13) MH-HEVC Descriptor (14) MH-Linkage Descriptor (15) MH-Event Group Descriptor (16) MH-Service List Descriptor (17) MH-Short Event Descriptor (18) MH-Extended Event Descriptor (19) Video Component Descriptor (20) MH-Stream Identifier Descriptor

[0314] (21) MH-Content Descriptor (22) MH-Parental Rating Descriptor (23) MH-Audio Component Descriptor (24) MH-Target Region Descriptor (25) MH-Series Descriptor (26) MH-SI Parameter Descriptor (27) MH-Broadcaster Name Descriptor (28) MH-Service Descriptor (29) IP Data Flow Descriptor (30) MH-CA Startup Descriptor

[0315] (31) MH-Type Descriptor (32) MH-Info Descriptor (33) MH-Expire Descriptor (34) MH-Compression Type Descriptor (35) MH-Data Component Descriptor (36) UTC-NPT Reference Descriptor (37) Event Message Descriptor (38) MH-Local Time Offset Descriptor (39) MH-Component Group Descriptor (40) MH-Logo Transmission Descriptor

[0316] (41) MPU Extended Timestamp Descriptor (42) MPU Download Content Descriptor (43) MH-Network Download Content Descriptor (44) MH-Application Descriptor (45) MH-Transport Protocol Descriptor (46) MH-Simple Application Location Descriptor (47) MH-Application Boundary and Permission Descriptor (48) MH-Autostart Priority Descriptor (49) MH-Cache Control Info Descriptor (50) MH-Randomized Latency Descriptor

[0317] (51) Linked PU Descriptor (52) Locked Cache Descriptor (53) Unlocked Cache Descriptor (54) MH-DL Protection Descriptor (55) Application Service Descriptor (56) MPU Node Descriptor (57) PU Structure Descriptor (58) MH-Hierarchy Descriptor (59) Content Copy Control Descriptor (60) Content Usage Control Descriptor

[0318] (61) Emergency News Descriptor (62) MH-CA Contract Info Descriptor (63) MH-CA Service Descriptor (64) MH-External Application Control Descriptor (65) MH-Playback Application Descriptor (66) MH-Simple Playback Application Location Descriptor (67) MH-Application Expiration Descriptor (68) Related Broadcaster Descriptor (69) Multimedia Service Descriptor (70) MH-Stuffing Descriptor (71) MH-Broadcast ID Descriptor (72) MH-Network Identification Descriptor (73) Descriptor set by the carrier

[0319] <Relationship Between Data Transmission and Control Information in MMT> FIG. 10J shows the relationship between data transmission and representative tables in an MMT broadcasting system.

[0320] In an MMT broadcasting system, data can be transmitted via multiple paths, such as a TLV stream via a broadcast transmission path and an IP data flow via a communication line. The TLV stream includes TLV-SI such as TLV-NIT and AMT, and an IP data flow, which is a data flow of IP packets. The IP data flow includes video assets including a series of video MPUs and audio assets including a series of audio MPUs. Furthermore, it may also include subtitle assets including a series of subtitle MPUs, superimposition assets including a series of superimposition MPUs, and data assets including a series of data MPUs. These various assets are associated on a package-by-package basis by an MPT (MMT package table) stored and transmitted in a PA message. Specifically, the package ID and the asset ID of each asset included in the package may be associated and described in the MPT.

[0321] The assets constituting a package can consist solely of assets in a TLV stream, but as shown in Figure 10J, they can also include assets transmitted via an IP data flow on a communication line. This can be achieved by including location information for each asset contained in the package in the MPT, allowing the broadcast receiving device 100 to determine the reference destination of each asset. The location information for each asset can specify various data transmitted via various transmission paths, such as: (1) data multiplexed in the same IP data flow as the MPT; (2) data multiplexed in an IPv4 data flow; (3) data multiplexed in an IPv6 data flow; (4) data multiplexed in the broadcast MPEG2-TS; (5) data multiplexed in the IP data flow in MPEG2-TS format; and (6) data at a specified URL.

[0322] An MMT broadcasting system also has the concept of an event. An event is a concept that indicates a so-called program handled by the MH-EIT that is included in the M2 section message and sent. Specifically, in a package indicated by an event package descriptor stored in the MH-EIT, a series of data included in a period of time from the start time stored in the MH-EIT is the data included in the concept of the event. The MH-EIT can be used in the broadcast receiving device 100 for various processes on an event-by-event basis (for example, generating a program guide, controlling recording and viewing reservations, copyright management processes such as temporary storage, etc.).

[0323] [Channel Setting Process of Broadcast Receiving Device] <Initial Scan> In current terrestrial digital broadcasting, the network ID is different for each sending master, and information about other stations is generally not recorded in the NIT. Therefore, the broadcast receiving device 100 of an embodiment of the present invention, which is compatible with current terrestrial digital broadcasting, must have the function of searching (scanning) all receivable channels at the receiving point for terrestrial digital broadcasting of an embodiment of the present invention (advanced terrestrial digital broadcasting, or terrestrial digital broadcasting in which advanced terrestrial digital broadcasting and current terrestrial digital broadcasting are simultaneously transmitted on different layers) and creating a service list (receivable frequency table) based on the service ID. Note that in areas where the same network ID can be received on different physical channels using an MFN (Multi Frequency Network), it is sufficient to basically operate by selecting a channel with a good reception C / N or BER (Bit Error Rate) and storing it in the service list.

[0324] In addition, for advanced BS digital broadcasting or advanced CS digital broadcasting received by the fourth tuner / demodulator 130B of the broadcast receiving device 100 according to the embodiment of the present invention, it is sufficient for the broadcast receiving device 100 to acquire and store the service list stored in the TLV-NIT, and there is no need to create a service list. Therefore, for advanced BS digital broadcasting or advanced CS digital broadcasting received by the fourth tuner / demodulator 130B, an initial scan and a rescan, which will be described later, are not required.

[0325] <Rescan> The broadcast receiving device 100 according to the embodiment of the present invention has a rescan function in preparation for cases where a new station opens, a new relay station is installed, the receiving location of the television receiver is changed, etc. When changing the existing setting information, the broadcast receiving device 100 can notify the user of this.

[0326] 11A shows an example of the operational sequence of the channel setting process (initial scan / rescan) of the broadcast receiving device 100 according to an embodiment of the present invention. Note that while the figure shows an example in which MPEG-2 TS is used as the media transport method, the process is basically the same when the MMT method is used.

[0327] In the channel setting process, the reception function control unit 1102 first sets the residential area (selects the area where the broadcast receiving device 100 is installed) based on a user instruction (S101). Instead of a user instruction, the residential area may be automatically set based on installation location information of the broadcast receiving device 100 acquired through a predetermined process. Examples of the installation location information acquisition process include acquiring information from a network connected to the LAN communication unit 121, or acquiring information about the installation location from an external device connected to the digital interface unit 125. Next, the reception function control unit 1102 sets an initial value for the frequency range to be scanned, and instructs the tuner / demodulator unit (the first tuner / demodulator unit 130C, the second tuner / demodulator unit 130T, and the third tuner / demodulator unit 130L will be described in this manner if no distinction is made between them; the same applies below) to tune to the set frequency (S102).

[0328] The tuner / demodulator performs tuning based on the instruction (S103), and if it succeeds in locking onto the set frequency (S103: Yes), it proceeds to processing S104. If it does not succeed in locking (S103: No), it proceeds to processing S111. In processing S104, it checks the C / N (S104), and if a C / N of a predetermined level or higher is obtained (S104: Yes), it proceeds to processing S105, where it performs reception confirmation processing. If a C / N of a predetermined level or higher is not obtained (S104: No), it proceeds to processing S111.

[0329] In the reception confirmation process, the reception function control unit 1102 first acquires the BER of the received broadcast wave (S105). Next, the NIT is acquired and compared to confirm whether the NIT is valid data (S106). If the NIT acquired in the process of S106 is valid data, the reception function control unit 1102 acquires information such as the transport stream ID and original network ID from the NIT. In addition, the reception function control unit 1102 acquires distribution system information related to the physical conditions of the broadcast transmission path corresponding to each transport stream ID / original network ID from the terrestrial distribution system descriptor. In addition, the reception function control unit 1102 acquires a list of service IDs from the service list descriptor.

[0330] Next, the reception function control unit 1102 checks the service list stored in the receiving device to determine whether the transport stream ID acquired in S106 has already been acquired (S107). If the transport stream ID acquired in S106 has not already been acquired (S107: No), the various information acquired in S106 is associated with the transport stream ID and added to the service list (S108). If the transport stream ID acquired in S106 has already been acquired (S107: Yes), the BER acquired in S105 is compared with the BER when the transport stream ID listed in the service list was acquired (S109). If the BER acquired in S105 is better (S109: Yes), the service list is updated with the various information acquired in S106 (S110). If the BER acquired in S105 is not better (S109: No), the various information acquired in S106 is discarded.

[0331] Furthermore, when creating (adding / updating) the service list, a remote control key ID may be obtained from the TS information descriptor, and a representative service for each transport stream may be associated with a remote control key. This process enables one-touch channel selection, which will be described later.

[0332] After completing the reception confirmation process, the reception function control unit 1102 checks whether the current frequency setting is the final value of the frequency range to be scanned (S111). If the current frequency setting is not the final value of the frequency range to be scanned (S111: No), the frequency value set in the tuner / demodulator unit is increased (S112), and the processes of S103 to S110 are repeated. If the current frequency setting is the final value of the frequency range to be scanned (S111: Yes), the process proceeds to S113.

[0333] In the process of S113, the service list created (added / updated) in the above process is presented to the user as a result of the channel setting process (S113). Also, if there is a duplicate remote control key, the user may be notified of this and prompted to change the remote control key setting (S114). The service list created / updated in the above process is stored in a non-volatile memory such as the ROM 103 or storage (accumulation) unit 110 of the broadcast receiving device 100.

[0334] Figure 11B shows an example of the data structure of an NIT. In the figure, "transportrt_stream_id" corresponds to the transport stream ID mentioned above, and "original_network_id" corresponds to the original network ID. Also, Figure 11C shows an example of the data structure of a terrestrial distribution system descriptor. In the figure, "guard_interval," "transmission_mode," "frequency," etc. correspond to the distribution system information mentioned above. Figure 11D shows an example of the data structure of a service list descriptor. In the figure, "service_id" corresponds to the service ID mentioned above. Figure 11E shows an example of the data structure of a TS information descriptor. In the figure, "remote_control_key_id" corresponds to the remote control key ID mentioned above.

[0335] The broadcast receiving device 100 may be controlled to change the frequency range to be scanned as appropriate depending on the broadcast service being received. For example, if the broadcast receiving device 100 is receiving broadcast waves from a current terrestrial digital broadcasting service, it is controlled to scan a frequency range of 470 to 770 MHz (corresponding to physical channels 13 to 62). That is, the initial value of the frequency range is set to 470 to 476 MHz (center frequency 473 MHz), the final value of the frequency range is set to 764 to 770 MHz (center frequency 767 MHz), and the processing in S112 is controlled to increase the frequency value by +6 MHz.

[0336] Furthermore, when the broadcast receiving device 100 is receiving broadcast waves including an advanced terrestrial digital broadcasting service, it is controlled to scan the frequency range of 470 to 1010 MHz (because the frequency conversion process shown in FIG. 7D or the frequency conversion amplification process shown in FIG. 8C may be performed). That is, the initial value of the frequency range is set to 470 to 476 MHz (center frequency 473 MHz), the final value of the frequency range is set to 1004 to 1010 MHz (center frequency 1007 MHz), and the processing in S112 is controlled to increase the frequency value by +6 MHz. Note that even when the broadcast receiving device 100 is receiving an advanced terrestrial digital broadcasting service, if it is determined that the aforementioned frequency conversion process or frequency conversion amplification process is not being performed, it is sufficient to control the device to scan only the frequency range of 470 to 770 MHz. The broadcast receiving device 100 can select and control the frequency range to be scanned based on the system identification and frequency conversion process identification of the TMCC information.

[0337] Furthermore, if the broadcasting system according to an embodiment of the present invention has the configuration shown in FIG. 7C and the broadcast receiving device 100 is receiving an advanced terrestrial digital broadcasting service using a dual-polarized transmission system, one of the tuning / detection units 131H and 131V may scan the frequency range of 470 to 770 MHz, and the other may scan the frequency range of 770 to 1010 MHz (when the transmission wave is subjected to frequency conversion processing using the polarization detected by the other tuning / detection unit). By controlling in this manner based on the system identification and frequency conversion processing identification of the TMCC information, it is possible to eliminate scanning of unnecessary frequency ranges and reduce the time required for channel setting. Furthermore, in this case, both the tuning / detection unit 131H and the tuning / detection unit 131V may perform the operation sequence of FIG. 11A in parallel, thereby synchronizing the frequency-up S112 loop in the operation sequence of FIG. 11A. In this case, if the frequency-up loop in the operational sequence of Figure 11A is configured to receive in parallel pairs of horizontally polarized and vertically polarized signals transmitted on the same physical channel in the same timing loop, it becomes possible to decode and acquire control information and the like within the packet stream of the advanced terrestrial digital service transmitted on the pair of horizontally polarized and vertically polarized signals during the loop processing. This is advantageous because it allows for efficient scanning and service list creation.

[0338] Similarly, if the broadcast receiving device 100 has the configuration shown in Figure 8B and further has a so-called double tuner configuration equipped with multiple tuner / demodulator units (channel selection / detection units) (for example, a configuration equipped with multiple third tuner / demodulator units 130L, or the configuration shown in Figure 8D), and is receiving an advanced terrestrial digital broadcasting service using a hierarchical division multiplexing transmission method, one of the dual tuners may scan the frequency range of 470 to 770 MHz, and the other may scan the frequency range of 770 to 1010 MHz (if frequency conversion amplification processing has been performed). By controlling in this way, it is possible to reduce the time required for channel setting, as described above.

[0339] As explained in Figures 8A, 8B, and 8C, in the configuration shown in Figure 8B, the terrestrial digital broadcasting service transmitted on either the upper or lower hierarchical layer is the current terrestrial digital broadcasting service. Therefore, for example, the first tuner / demodulator 130C may scan the frequency range in which the current terrestrial digital broadcasting service is transmitted, either the 470 to 770 MHz frequency range or the 770 to 1010 MHz frequency range, and the third tuner / demodulator 130L may scan the other frequency range in parallel. In this case, as with the parallel scanning using the dual tuners of the third tuner / demodulator 130L described above, the time required for channel setting can be reduced. Whether the current terrestrial digital broadcasting service or the advanced terrestrial digital broadcasting service is being transmitted in the frequency range of 470 to 770 MHz or the frequency range of 770 to 1010 MHz can be identified by receiving signals at two points in each frequency range, one at a time, for example, 470 to 476 MHz (center frequency 473 MHz) and 770 to 776 MHz (center frequency 773 MHz), using the third tuner / demodulation unit 130L before starting the initial scan / rescan operation sequence, obtaining the TMCC information transmitted at each frequency, and referring to the parameters (e.g., system identification parameters) stored in the TMCC information.

[0340] In an advanced terrestrial digital broadcasting service using a dual-polarized transmission system, for example, in the case of a channel having a broadcast program transmitted using both horizontally polarized and vertically polarized signals, such as a 4K broadcast program on layer C shown in layer division example (1) of Figure 7A, the same transport ID is detected by scanning both the 470-770 MHz frequency range and the 770-1010 MHz frequency range, and this is listed in the service list as a single channel. Also, in the case of a 2K broadcast program on layer B shown in the same figure, if the same broadcast program is transmitted on layer B using horizontally polarized signals and layer B using vertically polarized signals, even if the same transport ID is detected, it is sufficient to store it as a single channel in the service list. In other words, if the same broadcast program is transmitted on the same layer using different polarizations, it is merged and recognized as a single channel, and not recognized as separate channels. This can avoid user confusion, etc., caused by the existence of identical broadcast programs on different channels during tuning processing using a service list.

[0341] In contrast, in an advanced terrestrial digital broadcasting service using a dual-polarization transmission system, if different broadcast programs are transmitted on layer B of the horizontally polarized signal and layer B of the vertically polarized signal (if layer B of the vertically polarized signal is treated as virtual layer D), they are stored as different channels in the service list. Whether the same broadcast program is transmitted on layer B of the horizontally polarized signal and layer B of the vertically polarized signal can be determined by referring to the additional layer transmission identification parameter of the TMCC information in broadcast receiving device 100.

[0342] [Channel Selection Processing of Broadcast Receiving Device] The broadcast receiving device 100 according to an embodiment of the present invention has various program channel selection functions, including one-touch channel selection using a one-touch key on a remote control, channel up / down selection using the channel up / down keys on the remote control, and direct channel selection by directly entering a three-digit number using the numeric keypad on the remote control. All of these channel selection functions can be performed using information stored in the service list generated by the initial scan / rescan described above. After channel selection, information about the selected channel (such as the three-digit number used for direct channel selection, branch number, TS name, service name, logo, video resolution information (e.g., UHD, HD, or SD), whether or not video resolution up / downconversion is performed, the number of audio channels, whether or not audio downmixing is performed, etc.) is displayed using a banner or other display. This allows the user to visually obtain channel information after selection and confirm whether the desired channel has been selected. An example of processing for each channel selection method is described below.

[0343] <Example of one-touch channel selection processing> (1) By pressing a one-touch key on the remote control, the service with the “service_id” specified by the “remote_control_key_id” is selected. (2) Last mode is set, and channel information after selection is displayed.

[0344] <Example of up-down channel selection processing using channel up / down buttons> (1) Pressing the channel up / down keys on the remote control selects a channel in the order of the three-digit numbers used for direct channel selection. (1-1) When the up key is pressed, the adjacent service with the three-digit number above is selected. However, if the current three-digit number is the maximum value in the service list, the service with the minimum number is selected. (1-2) When the down key is pressed, the adjacent service with the three-digit number below is selected. However, if the current three-digit number is the minimum value in the service list, the service with the maximum number is selected. (2) Set the last mode and display channel information after selection.

[0345] <Example of direct channel selection processing> (1) When direct channel selection is selected, the device waits for the input of a three-digit number. (2-1) If the input of the three-digit number is not completed within a predetermined time (approximately five seconds), the device returns to normal mode and displays channel information for the currently selected service. (2-2) When the input of the three-digit number is completed, the device determines whether the channel exists in the service list of the receivable frequency table, and if not, displays a message such as "This channel does not exist." (3) If the channel exists, the device performs channel selection processing, sets the last mode, and displays channel information after selection.

[0346] Note that the channel selection operation is performed based on the SI, and if it is determined that a broadcast is suspended, the system may have a function of displaying this fact to notify the user.

[0347] <Remote Control for Broadcast Receiving Apparatus> FIG. 12A shows an example of an external view of a remote control (remote controller) used to input operation instructions to the broadcast receiving apparatus 100 according to an embodiment of the present invention.

[0348] The remote control 180R includes a power key 180R1 for turning the power on / off (standby on / off) of the broadcast receiving device 100, cursor keys (up, down, left, right) 180R2 for moving the cursor up, down, left, and right, a decision key 180R3 for deciding the item at the cursor position as the selected item, and a back key 180R4.

[0349] The remote control 180R also includes a network switching key (advanced terrestrial digital broadcasting, terrestrial digital broadcasting, advanced BS broadcasting, BS broadcasting, and CS broadcasting) 180R5 for switching between broadcast networks received by the broadcast receiving device 100. The remote control 180R also includes one-touch keys (1-12) 180R6 used for one-touch channel selection, channel up / down keys 180R7 used for channel up / down selection, and a 10-key used to input a three-digit number when directly selecting a channel. In the example shown in the figure, the 10-key also doubles as the one-touch key 180R6, and when directly selecting a channel, a three-digit number can be input by operating the one-touch key 180R6 after pressing the direct key 180R8.

[0350] The remote controller 180R also includes an EPG key 180R9 for displaying a program guide and a menu key 180RA for displaying a system menu. The program guide and system menu can be operated in detail using the cursor keys 180R2, the enter key 180R3, and the return key 180R4.

[0351] The remote control 180R also includes a d key 180RB used for data broadcasting services, multimedia services, etc., a link key 180RC for displaying a list of broadcasting and communication linked services and their corresponding applications, and color keys (blue, red, green, yellow) 180RD. For data broadcasting services, multimedia services, broadcasting and communication linked services, etc., detailed operations can be performed using the cursor keys 180R2, the enter key 180R3, the back key 180R4, and the color keys 180RD.

[0352] The remote control 180R also includes a video key 180RE for selecting a related video, an audio key 180RF for switching between audio ESs and bilingual modes, and a subtitle key 180RG for switching subtitles on and off and switching the subtitle language. The remote control 180R also includes a volume key 180RH for increasing and decreasing the volume of the audio output, and a mute key 180RI for switching the audio output on and off.

[0353] <Example of Network Switching Process Using Advanced Digital Terrestrial Key> The remote control 180R of the broadcast receiving device 100 according to an embodiment of the present invention includes an "Advanced Digital Terrestrial Key," a "Digital Terrestrial Key," an "Advanced BS Key," a "BS Key," and a "CS Key" as network switching keys 180R5. Here, the "Advanced Digital Terrestrial Key" and the "Digital Terrestrial Key" may be configured such that, for example, in an advanced terrestrial digital broadcasting service where 4K broadcast programs and 2K broadcast programs are simultaneously broadcast on different hierarchical levels, pressing the "Advanced Digital Terrestrial Key" prioritizes channel selection for 4K broadcast programs, whereas pressing the "Digital Terrestrial Key" prioritizes channel selection for 2K broadcast programs. This control allows, for example, when reception of a 4K broadcast program is possible but there are many errors in the transmission wave of the 4K broadcast program, pressing the "Digital Terrestrial Key" can forcibly select the 2K broadcast program. In addition, when 4K and 2K broadcast programs are being simultaneously broadcast on different hierarchical levels, if there are many errors in the transmission waves of the 4K broadcast program even when reception of the 4K broadcast program is possible, the 2K broadcast program (simulcast of the selected 4K broadcast program) may be selected even when the "Advanced Digital Terrestrial Key" is pressed.

[0354] <Example of screen display when selecting a channel> As described above, the broadcast receiving device 100 according to an embodiment of the present invention has a function of displaying information about the selected channel using a banner display or the like when a channel is selected using one-touch channel selection, channel up / down selection, direct channel selection, or the like.

[0355] FIG. 12B shows an example of a banner display when selecting a channel. Banner display 192A1 is an example of a banner display displayed when a 2K broadcast program is selected. For example, it may display the program name, program start time / end time, network type, the number of the direct channel selection key on the remote control, a service logo, and a three-digit number. Banner display 192A2 is an example of a banner display displayed when a 4K broadcast program is selected. For example, in addition to the same information as banner display 192A1, a symbol representing "advanced" indicating that the program being received is a 4K broadcast program is also displayed. Furthermore, if resolution conversion processing, downmixing processing, etc. has been performed, a display indicating this may be displayed. In the example of banner display 192A2, for example, it indicates that downconversion processing from UHD resolution to HD resolution and downmixing processing from 22.2 ch to 5.1 ch have been performed.

[0356] By displaying these items on the broadcast receiving device 100, when the same content is being broadcast simultaneously as broadcast programs of different qualities, such as a 2K broadcast program and a 4K broadcast program, through simulcasting or the like, the user can easily understand which broadcast program is being displayed.

[0357] The advanced digital broadcasting service system having some or all of the functions of the embodiments of the present invention described above can provide transmission and reception technologies for advanced digital broadcasting services with higher functionality that also take into consideration compatibility with current digital broadcasting services. In other words, it can provide technologies for more optimally transmitting or receiving advanced digital broadcasting services.

[0358] (Embodiment 2) [Advanced Audio Signals] This embodiment relates to the handling of advanced audio signals. Audio signals in current systems are channel-based signals corresponding to speakers. There are 5.1ch and 22.2ch types (here, "ch" stands for "channel"). In contrast, this embodiment handles audio signals that include object-based signals and HOA (Higher Order Ambisonics) signals in addition to channel-based signals.

[0359] An object-based signal is an audio signal whose playback position can be changed on the receiver side, such as by positioning a narrator's voice on the right or left side. The playback position is not fixed, but can be changed dynamically.

[0360] An HOA signal is a signal in which the sound field is expanded as a sum of spherical harmonic functions. Since there is an upper limit to the transmission capacity, expansion up to a finite order is used. Since channel-based signals are based on recording at microphone positions corresponding to standard speaker layouts, they are suitable for audio playback with a group of speakers in a standard or similar layout. In contrast, the HOA method records spatial sound field information independently of a specific speaker layout, making it suitable for use with any speaker layout.

[0361] Examples of standard speaker layouts are shown in Figures 13A, 13B, and 13C. As shown in Figure 13A, the speakers are divided into three groups, upper, middle, and lower, based on the height of their installation position. The layout of each group is shown in Figures 13B and 13C. Figure 13B shows the layout of a 22.2-channel speaker system, and Figure 13C shows the layout of a 7.1-channel speaker system. The decimal point in the channel number display indicates the channel number of low-frequency signals, and the corresponding speakers are LFE1, LFE2, and LFE. The channels for other signals are called main channels. A 7.1-channel speaker system minus the upper-channel speakers results in a 5.1-channel speaker system.

[0362] In current systems, if the speaker system has the same number of speakers as the channel-based audio signal, the audio is played back as is. However, if the number of speakers differs from the number of channels in the speaker system, the audio is played back after format conversion to match the number of speakers in the speaker system. In particular, when the number of speakers is fewer than the number of channels in the audio signal, this format conversion is called downmixing. Format conversion is also performed when the speaker system position assumed when creating the audio signal differs from the actual speaker system position. The sound to be output from the actual speaker position is synthesized by weighting and adding the audio signals of each channel. In a standard speaker system arrangement, each speaker is placed at an equal distance from the expected standard listening position of the viewer, so playback time adjustment is not necessary. However, if the actual speakers are not placed at an equal distance from the viewer's position, playback time adjustment may also be performed. Format conversion is expressed as in Equation 1 below.

[0363]

[0364] Here, s (ch) n (t) is a channel-based audio signal transmitted by broadcasting or communication, n is the signal number, and the number of channel-based signals is N (ch) t is the time. (ch) m (t) is the audio signal input to the speaker, m is the speaker number, and the number of speakers is M. (ch) mn is the weighting coefficient for the channel-based signal. m is the distance R between the standard listening position and the speaker farthest from the standard listening position o The delay time is adjusted according to the deviation from the mth speaker position. m If the speed of sound is c, then Δt m is given by the following equation 2:

[0365]

[0366] Next, in the case of advanced audio signals, which include object-based signals and HOA signals, each of them is converted into a signal to be input to the speaker by weighting and adding the transmitted signal, as shown in Equation 3 and Equation 4, in the same way as the format conversion formula for channel-based signals.

[0367]

[0368]

[0369] Here, the meaning of the symbols is the same as that of the channel-based signal, and the superscript (ch) indicates that the symbol is for a channel-based signal, (obj) indicates that it is for an object-based signal, and (HOA) indicates that it is for a signal of the HOA system. In a system that handles advanced audio signals, including these, the audio signal p input to the speaker system m (t) is given by the following equation 5:

[0370]

[0371] Here, the weighting coefficient g (*) mn is determined by the relationship between the speaker arrangement and the standard listening position, but the weighting coefficient g (obj) mn is determined taking into consideration the playback position of each object. Note that the content common to all signals is expressed using a superscript (*) of the symbol.

[0372] When listening to audio through headphones, the above format conversion is performed with M=2. However, in the case of headphones, the position of the audio output unit relative to the receiver screen changes depending on the direction of the viewer's face, so the weighting coefficient g (*) mn The positional relationship between the broadcast receiving device 100 and headphones is shown in FIG. 14A. The midpoint of the line connecting the left and right audio output units is the listening position in this case. Note that in the case of normal headphones, the audio output units are made symmetrical, so Δt m =0.

[0373] The sound field created by the audio signals is based on a reference coordinate system with the center of the receiver screen as the reference direction. Meanwhile, the audio output unit of the headphones changes its position within this reference coordinate system as the user rotates their head (Fig. 14B). Therefore, the weighting coefficient g (*) mn is calculated taking into account the position of the headphone audio output unit in the reference coordinate system at that time. The position of the headphone audio output unit can be obtained, for example, by recording the position at which the user faces the center of the receiver screen through user input, and then detecting subsequent changes in the direction of the user's face using a gyro sensor or the like mounted on the headphones. Note that although Fig. 14B shows the arrangement on a plane, the position in the vertical direction may also be taken into account.

[0374] An example configuration of an audio decoder is shown next. This audio decoder is incorporated into the audio decoders 146S and 146U in Figures 2F and 2G within the overall configuration. Figure 15A shows an example configuration of an audio decoder 10000 when the audio signal to be transmitted is only a channel-based signal. First, an audio bitstream multiplexed and transmitted via broadcasting or communication is decoded into signals for each channel by a core decoder 10001. Next, a format converter 10002 performs the above-mentioned format conversion, and outputs an audio signal for a speaker and an audio signal for a headphone. Output to an external device may be performed wirelessly.

[0375] 15B shows an example of the configuration of an audio decoder 10100 that supports advanced audio signals. In the case of advanced audio signals, the audio bit stream that has been multiplexed and transmitted via broadcasting or communication is first decoded into each signal by a core decoder 10101. Here, each signal refers to a channel-based signal, an object-based signal, and an HOA system signal. In the case of advanced audio signals, output to an external device may also be performed wirelessly.

[0376] [Channel-Based Signal Processing] First, the processing of the channel-based signal will be described. As with current audio signals, the channel-based signal is converted by format converter 10102 into a signal for each speaker according to the speaker layout using Equation 1. At the same time, the channel-based signal is also converted into a signal for headphones. The speaker layout information stored in the receiver is used.

[0377] An example of speaker placement information is shown in Figure 16. The placement information is composed of the speaker type (main channel or low frequency channel), azimuth position, height position (elevation angle, dip angle), and distance from the viewer's head position, corresponding to a number that distinguishes the speaker. Here, the azimuth position is defined as a direction rotated leftward from the viewing position, with a positive value representing the direction rotated to the left, and a negative value representing the direction rotated to the right, with the horizontal direction being defined as 0° from the viewer's head position. The height position is defined as a direction rotated leftward from the viewing position, with a positive value representing the angle of elevation, and a negative value representing the angle of dip. Using this information and the configuration of the channel-based signal, the weighting coefficient g mentioned above can be calculated. (ch) mn is set. Also, Δt m However, if there is no distance information, the delay time is not adjusted. Note that although the speaker placement information here is displayed in polar coordinates, it may also be displayed in rectangular coordinates.

[0378] This speaker layout information may be standard layout information such as a 5.1ch speaker system, or may be speaker layout information specific to the receiver. It may also be layout information for a speaker system customized by the receiver user. In this case, the user-customized layout information is registered before viewing a program, allowing the user to set which layout information to use. It may also be possible to switch between the speaker system provided in the receiver and a speaker system customized by the user. Furthermore, the speaker system to be used for each program may be scheduled. Alternatively, the speaker system to be used may be set for each program type, time period, or viewer. Audio playback according to the program content and the viewing environment at the time is possible, improving user convenience.

[0379] Here, an example of weighting coefficients when a 22.2ch channel base signal, which is a standard signal configuration, is output to a 5.1ch speaker system, which is a standard speaker arrangement, is shown below. The format conversion formula is expressed as follows. C'=FC+g1*FLc+g1*FRc+g3*(TpFC+g4*TpC+BtFC) (Formula 6) L'=FL+g1*FLc+g2*SiL+g3*(TpFL+g2*TpSiL+BtFL) (Formula 7) R'=FR+g1*FRc+g2*SiR+g3*(TpFR+g2*TpSiR+BtFR) (Formula 8) Ls'=BL+g5*BC+g2*SiL+g3*(TpBL+g5*TpBC+g2*TpSiL+g4*TpC) (Formula 9) Rs'=BR+g5*BC+g2*SiR+g3*(TpBR+g5*TpBC+g2*TpSiR+g4*TpC) (Formula 10) LFE'=g6*(LFE1+LFE2) (Formula 11)

[0380] The above g1, g2, g3, g4, g5, and g6 are weighting coefficients (downmix coefficients), and their default values ​​are shown in Figure 17A. These downmix coefficients are transmitted as metadata for the audio signal, but the default values ​​are used until they are received. The conversion formulas and default values ​​for the weighting coefficients are the same as those used in systems that handle audio signals that only use channel-based signals. Sharing processing between systems also makes it possible to share signal processing units, which, in the case of shared receivers, leads to a reduction in the overall system size.

[0381] When converting an audio signal with more than 5.1 channels into a signal to be output to a 2-channel speaker system, the signal is first downmixed to a 5.1-channel signal and then downmixed to a 2-channel signal. Examples of the conversion formula for downmixing from 5.1 channels to 2 channels are shown below: Lt'=L+g7*C+g8*Ls (Formula 12) Rt'=R+g7*C+g8*Rs (Formula 13) The above g7 and g8 are weighting coefficients (downmix coefficients), and their default values ​​are shown in Figure 17B. These downmix coefficients are transmitted as metadata for the audio signal, but their default values ​​are used until reception. The conversion formula and the default values ​​for the weighting coefficients are the same as those used in systems that handle audio signals that only use channel-based signals. Sharing processing between systems also makes it possible to share signal processing units, which, in the case of shared receivers, leads to a reduction in the overall system size.

[0382] Next, we will explain how to set the speaker system to be used during viewing. The speaker system to be used can be the built-in speaker built into the receiver, a wired external speaker, or a wireless external speaker. The speaker selection can be performed using a remote control (e.g., using the arrow buttons) or a linked device such as a smartphone. An example of a speaker setting selection menu is shown in FIG. 18. FIG. 18 shows the system "External Speaker 1" selected. The external speaker system can be a mixture of wired and wireless connections. User-defined speaker systems are speaker systems that combine speakers from each system. For example, a system that combines built-in speakers with external speakers for expansion. The selection menu allows viewers to easily select the optimal speaker system based on their preferences and the viewing environment at the time, improving viewer convenience.

[0383] When using the above speaker system, the placement information shown in FIG. 16 is required. This placement information may be input by the viewer or downloaded from the website of the receiver or speaker manufacturer. The receiver may download this placement information after receiving identification information, such as the model number of the speaker system, from the receiver. Alternatively, placement information recorded on the speaker itself may be transmitted to the receiver. Furthermore, the receiver and the speaker may work together to measure the actual speaker placement and create and modify the placement information. The placement may be measured using, for example, a camera or a ranging device such as UWB (Ultra Wideband) provided on the receiver or the speaker, or both. When the placement information is changed by measurement or user input, the overlapping coefficient may be changed even during viewing, or may be changed at a break in the program, a break in the audio output, or when changing channels. Properly setting and processing the speaker system placement information results in good audio playback quality.

[0384] Furthermore, when an external speaker system is used, the weighting coefficients used in the format conversion may be provided externally. These weighting coefficients may be input by the user, input to the receiver via communication from the speaker system, or obtained by the receiver from a server.

[0385] In the case of an external speaker system, the speaker system may have an audio conversion function. In this case, the receiver may adjust the signal output to the speaker system upon request from the speaker system. Adjustments to the output signal include, for example, adjusting the number of channels of a channel-based signal, the number of object-based signals, the number of HOA signals, and the range of metadata required for their playback. If a program has limitations on the signals that can be output (e.g., the number of channels), the output signal may be adjusted for each program. Furthermore, if the external speaker system also has an audio bitstream decoder, the audio bitstream may be output to the externally connected speaker system via the bitstream output controller 10106 shown in FIG. 15B. By appropriately adjusting the output signal, audio output operation is guaranteed.

[0386] [Processing of Object-Based Signals] Next, processing of object-based signals will be described. Object-based signals are signals for each sound source, and are separated from the bitstream signal by the core decoder 10101 into signals for each sound source. Next, the object renderer 10103 calculates the output signal for each speaker based on the accompanying playback position information. At this time, the layout information of the actual speaker system is also taken into consideration. When calculating the output signal for each speaker, the calculation may be performed directly, or the output signal for a standard 22.2-channel speaker system may be calculated first, and then the output signal for the actual speaker system may be calculated in accordance with the format conversion of the channel-based signal. This allows some processing to be standardized.

[0387] Furthermore, when external speakers are used, weighting coefficients fo...

Claims

a decoder unit that acquires, from a first video stream received at a base layer, a first content of a broadcast program for which protection by first protection information is specified, and acquires, from a second video stream received at a sublayer, a second content of the broadcast program for which protection by second protection information is specified; a storage unit that stores broadcast program information including the first content and the second content acquired by the decoder unit; a control unit that performs copy control of the broadcast program information based on the first protection information and the second protection information, the first protection information is information that defines a first condition regarding copying of the first content, the second protection information is information that specifies a second condition regarding copying of the second content; Broadcast receiving device.

2. The broadcast receiving device according to claim 1, the second content includes third protection information that defines a third condition regarding copying of audio information included in the second content; when copying the broadcast program information, the control unit determines whether or not the audio information can be copied based on the setting of the third condition. Broadcast receiving device.

2. The broadcast receiving device according to claim 1, further comprising a storage unit that stores the first content and the second content; the storage unit stores information regarding the number of copies that can be made of the first content and the number of copies that can be made of the second content based on the first protection information and the second protection information; The control unit If the first content is copied, the number of copies of the stored first content that can be made is reduced; If the second content is copied, the number of copies of the stored second content that can be made is reduced; Furthermore, the number of copies of the stored first content is controlled so as not to exceed the number of copies of the stored second content. Broadcast receiving device.

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