Method for generating a transmission wave

Abstract

To provide a technique for more suitably transmitting or receiving an advanced digital broadcasting service.SOLUTION: In a transmission wave in which a 4K broadcast service and a 2K broadcast service are transmitted together, the 4K broadcast service and the 2K broadcast service are stored and transmitted in different hierarchies each composed of a combination of different segments among a plurality of frequency segments obtained by dividing a frequency band of a predetermined band of a broadcast wave into a plurality of frequency bands. In TMCC information included in a transmission wave, 3-bit identification information for identifying whether or not a modulating method is synchronous modulating is set for each of a first layer in which a 4K broadcast service is stored and a second layer in which a 2K broadcast service is stored, and the 3-bit identification information set in the first layer and the 3-bit identification information set in the second layer are set to different values even when the modulating methods of both the first layer and the second layer are synchronous modulating.SELECTED DRAWING: Figure 19A

Description

[Technical Field]

[0001] The present invention relates to a broadcast transmission technique or a broadcast reception technique. [Background technology]

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

[0003] In recent years, various countries have been studying advanced digital broadcasting systems with the aim of further improving frequency utilization efficiency, increasing resolution and providing more advanced functionality. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-14420 Summary of the Invention [Problem to be solved by the invention]

[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 launching the advanced digital broadcasting service currently under consideration, 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 for the current digital broadcasting service.

[0006] A technology for realizing UHD broadcasting in digital broadcasting services is the system described in Patent Document 1. However, the system described in Patent Document 1 is intended to replace current digital broadcasting and does not take into consideration the maintenance of the viewing environment for current digital broadcasting services.

[0007] An object of the present invention is to provide a technology for more suitably transmitting or receiving a more sophisticated advanced digital broadcasting service, taking into consideration compatibility with current digital broadcasting services. [Means for solving the problem]

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

[0009] As an example, a method for generating a transmission wave including a first broadcast service in which both a first broadcast service and a second broadcast service are transmitted, wherein the first broadcast service and the second broadcast service are stored and transmitted in different layers each composed of a combination of different segments among a plurality of frequency segments obtained by dividing a predetermined frequency band of the transmission wave including the first broadcast service into a plurality of segments, and the method includes a setting step of setting 3-bit identification information in TMCC information included in the transmission wave including the first broadcast service, for each of the first layer in which the first broadcast service is stored and the second layer in which the second broadcast service is stored, capable of identifying whether the modulation method is synchronous modulation or not, and in the setting step, in generating the transmission wave including the first broadcast service, even if the modulation methods of both the first layer in which the first broadcast service is stored and the second layer in which the second broadcast service is stored are synchronous modulation, and the 3-bit identification information to be set in the first layer in which the second broadcast service is stored is set to a different value from the 3-bit identification information to be set in the second layer in which the second broadcast service is stored, and in generating a transmission wave including the first broadcast service, the 3-bit identification information is always set to 111 in the first layer in which the first broadcast service whose modulation method is synchronous modulation is stored, and in generating a transmission wave including the first broadcast service, the 3-bit identification information is always set to 000 in the second layer in which the second broadcast service whose modulation method is synchronous modulation is stored, and in generating the transmission wave including the first broadcast service, the 3-bit identification information is always set to 000, and in generating the transmission wave, data of a broadcast service whose modulation method is synchronous modulation and whose 3-bit identification information is set to 111 in the setting step and data of a service whose modulation method is synchronous modulation and whose 3-bit identification information is set to 000 in the setting step are each subjected to inter-segment interleaving processing in different inter-segment interleaving processing units, and the compression technology used in the first broadcast service is a compression technology with higher efficiency than the compression technology used in the second broadcast service.Use a transmission wave generation method. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a technique for more suitably transmitting or receiving advanced digital broadcasting services. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a system configuration diagram of a broadcasting system according to an embodiment of the present invention. [Figure 2A] 1 is a block diagram of a broadcast receiving device according to an embodiment of the present invention. [Figure 2B] 2 is a detailed block diagram of a first tuner / demodulator unit of a broadcast receiving device according to an embodiment of the present invention. FIG. [Figure 2C] FIG. 2 is a detailed block diagram of a second tuner / demodulator unit of a broadcast receiving device according to an embodiment of the present invention. [Figure 2D] FIG. 2 is a detailed block diagram of a third tuner / demodulator unit of a broadcast receiving device according to an embodiment of the present invention. [Figure 2E] FIG. 2 is a detailed block diagram of a fourth tuner / demodulator unit of a broadcast receiving device according to an embodiment of the present invention. [Figure 2F] 2 is a detailed block diagram of a first decoder unit of a broadcast receiving device according to an embodiment of the present invention. FIG. [Figure 2G] 4 is a detailed block diagram of a second decoder unit of a broadcast receiving device according to an embodiment of the present invention. FIG. [Figure 2H] 2 is a software configuration diagram of a broadcast receiving device according to an embodiment of the present invention. FIG. [Figure 3A] FIG. 2 is a configuration diagram of a broadcasting station server according to an embodiment of the present invention. [Figure 3B] FIG. 2 is a configuration diagram of a service provider server according to an embodiment of the present invention. [Figure 4A] 1 is a diagram illustrating a segment configuration related to digital broadcasting according to an embodiment of the present invention. FIG. [Figure 4B] 1 is a diagram illustrating hierarchical allocation in hierarchical transmission related to digital broadcasting according to an embodiment of the present invention. [Figure 4C] 1 is a diagram illustrating a generation process of an OFDM transmission wave related to digital broadcasting in an embodiment of the present invention. [Figure 4D] 1 is a diagram illustrating a basic configuration of a transmission path coding unit related to digital broadcasting in an embodiment of the present invention. [Figure 4E] FIG. 2 is a diagram illustrating segment parameters of an OFDM system related to digital broadcasting according to an embodiment of the present invention. [Figure 4F] FIG. 2 is a diagram illustrating transmission signal parameters related to digital broadcasting according to an embodiment of the present invention. [Figure 4G] 10A and 10B are diagrams illustrating the arrangement of pilot signals in synchronous modulation segments in digital broadcasting according to an embodiment of the present invention. [Figure 4H] 1 is a diagram illustrating the arrangement of pilot signals in differential modulation segments related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 5A] 1 is a diagram illustrating bit allocation of TMCC carriers for digital broadcasting according to an embodiment of the present invention. FIG. [Figure 5B] 1 is a diagram illustrating bit allocation of TMCC information related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 5C] 10A and 10B are diagrams illustrating transmission parameter information of TMCC information related to digital broadcasting in one embodiment of the present invention. [Figure 5D] FIG. 10 is a diagram illustrating system identification of TMCC information related to digital broadcasting in one embodiment of the present invention. [Figure 5E] 1 is a diagram illustrating a carrier modulation mapping method for TMCC information in digital broadcasting according to an embodiment of the present invention. FIG. [Figure 5F] FIG. 10 is a diagram illustrating frequency conversion processing identification of TMCC information related to digital broadcasting in one embodiment of the present invention. [Figure 5G] 1 is a diagram illustrating physical channel number identification of TMCC information related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 5H] 1 is a diagram illustrating an example of main signal identification of TMCC information related to digital broadcasting in an embodiment of the present invention. FIG. [Figure 5I]10 is a diagram illustrating 4K signal transmission layer identification of TMCC information related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 5J] 10A and 10B are diagrams illustrating additional layer transmission identification of TMCC information related to digital broadcasting in one embodiment of the present invention. [Figure 5K] 10 is a diagram illustrating identification of the coding rate of the inner code of TMCC information related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 5L] 1 is a diagram illustrating bit allocation of TMCC carriers for digital broadcasting according to an embodiment of the present invention. FIG. [Figure 6A] FIG. 2 is a diagram illustrating bit allocation of an AC signal related to digital broadcasting according to an embodiment of the present invention. [Figure 6B] 1 is a diagram illustrating the configuration identification of an AC signal related to digital broadcasting according to an embodiment of the present invention. FIG. [Figure 6C] FIG. 2 is a diagram illustrating earthquake alarm information of an AC signal related to digital broadcasting in one embodiment of the present invention. [Figure 6D] FIG. 2 is a diagram illustrating signal identification of earthquake alarm information of an AC signal related to digital broadcasting in one embodiment of the present invention. [Figure 6E] 10 is a diagram illustrating earthquake alarm detail information of earthquake alarm information of an AC signal related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 6F] 10 is a diagram illustrating earthquake alarm detail information of earthquake alarm information of an AC signal related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 6G] 10A and 10B are diagrams illustrating additional information related to transmission control of modulated waves of AC signals in digital broadcasting according to an embodiment of the present invention. [Figure 6H] 10A and 10B are diagrams illustrating additional transmission parameter information of an AC signal related to digital broadcasting according to an embodiment of the present invention. [Figure 6I] 1 is a diagram illustrating an error correction method for AC signals related to digital broadcasting in an embodiment of the present invention. [Figure 6J] 1 is a diagram illustrating the NUC format of an AC signal related to digital broadcasting in an embodiment of the present invention. [Figure 7A]1 is a diagram illustrating a dual-polarized transmission system according to an embodiment of the present invention; [Figure 7B] 1 is a system configuration diagram of a broadcasting system using a dual-polarized transmission method according to an embodiment of the present invention. [Figure 7C] 1 is a system configuration diagram of a broadcasting system using a dual-polarized transmission method according to an embodiment of the present invention. [Figure 7D] 10A and 10B are diagrams illustrating a frequency conversion process according to an embodiment of the present invention. [Figure 7E] 1 is a diagram illustrating the configuration of a pass-through transmission method according to an embodiment of the present invention. [Figure 7F] FIG. 10 is a diagram illustrating a pass-through transmission band according to an embodiment of the present invention. [Figure 7G] 1 is a diagram illustrating the configuration of a pass-through transmission method according to an embodiment of the present invention. [Figure 7H] FIG. 10 is a diagram illustrating a pass-through transmission band according to an embodiment of the present invention. [Figure 7I] FIG. 10 is a diagram illustrating a pass-through transmission band according to an embodiment of the present invention. [Figure 8A] 1 is a diagram illustrating a layer division multiplexing transmission method according to an embodiment of the present invention. [Figure 8B] 1 is a system configuration diagram of a broadcasting system using a layer division multiplexing transmission method according to an embodiment of the present invention. [Figure 8C] 10A and 10B are diagrams illustrating a frequency conversion and amplification process according to an embodiment of the present invention. [Figure 9A] FIG. 1 is a diagram illustrating a protocol stack of MPEG-2 TS. [Figure 9B] FIG. 1 is a diagram illustrating the names and functions of tables used in MPEG-2 TS. [Figure 9C] FIG. 1 is a diagram illustrating the names and functions of tables used in MPEG-2 TS. [Figure 9D] FIG. 1 is a diagram illustrating the names and functions of descriptors used in MPEG-2 TS. [Figure 9E] FIG. 1 is a diagram illustrating the names and functions of descriptors used in MPEG-2 TS. [Figure 9F] FIG. 1 is a diagram illustrating the names and functions of descriptors used in MPEG-2 TS. [Figure 9G] FIG. 1 is a diagram illustrating the names and functions of descriptors used in MPEG-2 TS. [Figure 9H] FIG. 1 is a diagram illustrating the names and functions of descriptors used in MPEG-2 TS. [Figure 9I] FIG. 1 is a diagram illustrating the names and functions of descriptors used in MPEG-2 TS. [Figure 10A] FIG. 1 is a diagram illustrating a protocol stack in an MMT broadcast transmission path. [Figure 10B] FIG. 1 is a diagram illustrating a protocol stack in an MMT communication line. [Figure 10C] This is a diagram explaining the names and functions of tables used in MMT TLV-SI. [Figure 10D] This is a diagram explaining the names and functions of descriptors used in MMT TLV-SI. [Figure 10E] This is a diagram explaining the names and functions of messages used in MMT-SI of MMT. [Figure 10F] This is a diagram explaining the names and functions of tables used in MMT-SI of MMT. [Figure 10G] This is a diagram explaining the names and functions of descriptors used in MMT-SI of MMT. [Figure 10H] This is a diagram explaining the names and functions of descriptors used in MMT-SI of MMT. [Figure 10I] This is a diagram explaining the names and functions of descriptors used in MMT-SI of MMT. [Figure 10J] FIG. 1 is a diagram illustrating the relationship between data transmission according to the MMT method and each table. [Figure 11A] 3 is an operational sequence diagram of a channel setting process of the broadcast receiving device 100 according to an embodiment of the present invention. FIG. [Figure 11B] FIG. 10 is a diagram illustrating the data configuration of a network information table. [Figure 11C] FIG. 10 is a diagram illustrating the data structure of a terrestrial distribution system descriptor. [Figure 11D] FIG. 10 is a diagram illustrating the data structure of a service list descriptor. [Figure 11E] FIG. 2 is a diagram illustrating the data structure of a TS information descriptor. [Figure 12A] 1 is an external view of a remote controller according to an embodiment of the present invention; [Figure 12B] 10A and 10B are diagrams illustrating a banner display when a channel is selected according to an embodiment of the present invention. [Figure 13] FIG. 1 is a diagram illustrating an example of a reception range of layer division multiplexing terrestrial digital broadcasting. [Figure 14] 1 is a diagram illustrating an example of a modulated wave of layer division multiplexing terrestrial digital broadcasting. [Figure 15] FIG. 10 is a diagram illustrating an example of additional information on transmission parameters of an AC signal related to digital broadcasting according to an embodiment of the present invention. [Figure 16A] 10A and 10B are diagrams illustrating an example of injection level state identification of an AC signal related to digital broadcasting according to an embodiment of the present invention. [Figure 16B] 10A and 10B are diagrams illustrating an example of injection level state identification of an AC signal related to digital broadcasting according to an embodiment of the present invention. [Figure 17] FIG. 2 is an explanatory diagram illustrating an example of an operation sequence of a rescanning process of the broadcast receiving device 100 according to an embodiment of the present invention. [Figure 18] 1 is a diagram illustrating modulated waves of layer division multiplexing terrestrial digital broadcasting. [Figure 19A] FIG. 1 is a diagram illustrating frequency interleaving. [Figure 19B] FIG. 1 is a diagram illustrating frequency deinterleaving. [Figure 19C] FIG. 1 is a diagram illustrating frequency deinterleaving. [Figure 20] 1 is a diagram illustrating hierarchical allocation in hierarchical transmission related to digital broadcasting according to an embodiment of the present invention. [Figure 21A] 1 is a block diagram of a broadcast receiving device according to an embodiment of the present invention. [Figure 21B]FIG. 2 is a detailed block diagram of a second tuner / demodulator unit of a broadcast receiving device according to an embodiment of the present invention. [Figure 21C] 4 is a detailed block diagram of a second demodulation unit of a broadcast receiving device according to an embodiment of the present invention. FIG. [Figure 22] 1 is a configuration diagram of a broadcasting system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

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

[0013] Example 1 [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 mobile information terminal 700, a broadband network 800 such as the Internet, and a router device 800R. In addition, various server devices and communication devices may be further 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 is compatible with a broadcasting and 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, and can transmit and receive data via communication with each server device on the Internet 800.

[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 mobile information terminal 700 via wireless communication. This allows each server device on Internet 800, broadcast receiving device 100, and mobile information terminal 700 to transmit and receive data to and from each other via router device 800R. Router device 800R, broadcast receiving device 100, and mobile information terminal 700 form a LAN (Local Area Network). Note that communication between broadcast receiving device 100 and mobile 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 the broadcasting equipment of the broadcasting station, and transmits digital broadcast waves including various control information related to digital broadcasting services and content data of broadcast programs (video content, audio content, etc.). The broadcasting station also includes broadcasting station server 400. Broadcasting station server 400 stores content data of broadcast programs and metadata of each broadcast program, such as the program title, program ID, program summary, cast, broadcast date and time, etc. 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 broadcasting station server 400 may also have the functions of the service provider server 500.

[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 data transmission / reception between mobile information terminal 700 and each server device on the 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] [Broadcast receiving device hardware configuration] FIG. 2A is a block diagram showing an example of the internal configuration of broadcast receiving device 100. As shown in FIG.

[0021] The broadcast receiving device 100 is composed of a main control unit 101, a system bus 102, a ROM 103, a 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.

[0022] 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.

[0023] The ROM (Read Only Memory) 103 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 (Electrically Erasable Programmable ROM) or a flash ROM. The ROM 103 also stores operation setting values ​​and the like required for the operation of the broadcast receiving device 100. The RAM (Random Access Memory) 104 serves as a work area when the basic operation programs and other operation programs are executed. The ROM 103 and the RAM 104 may be integrated with the main control unit 101. The ROM 103 may not be an independent configuration as shown in FIG. 2A, but may use a partial storage area within the storage (accumulation) unit 110.

[0024] The storage (accumulation) unit 110 stores the operating programs 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, for example, a semiconductor memory such as a flash ROM or an SSD (Solid State Drive), a magnetic disk drive such as an HDD (Hard Disc Drive), or the like is used.

[0025] 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.

[0026] 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 part of it) 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, etc. 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.

[0027] 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 wave of the received signal, as well as frame structure and hierarchical structure reconstruction, energy despreading, error correction decoding, and the like to reproduce a packet stream. They also perform extraction and decoding of a transmission TMCC (Transmission Multiplexing Configuration Control) signal from the received signal.

[0028] The first tuner / demodulator 130C can input digital broadcast waves of the current terrestrial digital broadcasting service received by antenna 200C, which is a current terrestrial digital broadcasting receiving antenna. The first tuner / demodulator 130C can also input a broadcast signal of either horizontally (H) or vertically (V) polarized wave of dual-polarized terrestrial digital broadcasting (described later) and demodulate a layer 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 later) and demodulate a layer that employs the same modulation method as the current terrestrial digital broadcasting service. The second tuner / demodulator 130T inputs digital broadcast waves of the advanced terrestrial digital broadcasting service received by antenna 200T, which is a dual-polarized terrestrial digital broadcasting receiving antenna, via converter 201T. The third tuner / demodulator 130L receives digital broadcast waves of an advanced terrestrial digital broadcasting service received by an antenna 200L, which is an antenna for receiving hierarchical division multiplexed terrestrial digital broadcasting, via a converter 201L. The fourth tuner / demodulator 130B receives digital broadcast waves of an advanced BS (Broadcasting Satellite) digital broadcasting service or an advanced CS (Communication Satellite) digital broadcasting service received by an antenna 200B, which is an antenna for receiving both BS and CS, via a converter 201B.

[0029] The expression "tuner / demodulation unit" refers to a component that has a tuner function and a demodulation function.

[0030] 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.

[0031] Furthermore, the current terrestrial digital broadcasting mentioned above is a broadcast signal for a terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically.

[0032] Also, dual-polarized terrestrial digital broadcasting (advanced terrestrial digital broadcasting that uses a dual-polarized transmission method) will be described in more detail later, but it is a broadcast signal for a terrestrial digital broadcasting service that can transmit 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, horizontal (H) and vertical (V), 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 in both polarized waves.

[0033] 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 capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels by 1080 vertical pixels.

[0034] Furthermore, hierarchical division multiplexing terrestrial digital broadcasting (advanced terrestrial digital broadcasting employing a hierarchical division multiplexing transmission method) will be described in detail later, but 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 mean that the power at which the digital broadcasting signals are transmitted is different. In the hierarchical division multiplexing terrestrial digital broadcasting of each embodiment of the present invention, the plurality of digital broadcasting signals with different signal levels can be hierarchically multiplexed and transmitted in the frequency band of the same physical channel, with the broadcast signal of a current terrestrial digital broadcasting service transmitting video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels and the broadcast signal of a terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels by 1080 vertical pixels. 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, the 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.

[0035] Note that the broadcast receiving device in each embodiment of the present invention need only be configured to be able to suitably receive advanced digital broadcasts, and does not necessarily need to include all of first tuner / demodulation unit 130C, second tuner / demodulation unit 130T, third tuner / demodulation unit 130L, and fourth tuner / demodulation unit 130B. For example, it is sufficient to include at least either second tuner / demodulation unit 130T or third tuner / demodulation unit 130L. Furthermore, to achieve more advanced functionality, it may also include one or more of the above four tuner / demodulation units in addition to either second tuner / demodulation unit 130T or third tuner / demodulation unit 130L.

[0036] Furthermore, antenna 200C, antenna 200T, and antenna 200L may be shared as appropriate. Furthermore, among first tuner / demodulator 130C, second tuner / demodulator 130T, and third tuner / demodulator 130L, a plurality of tuners / demodulators may be shared (or integrated) as appropriate.

[0037] The first decoder unit 140S and the second decoder unit 140U each input a packet stream output 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, or a packet stream acquired from each server device on the Internet 800 via the LAN communication unit 121. The packet streams input to 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).

[0038] 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 a 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), playing back data broadcasting screens and multimedia data, etc. They also perform processing to superimpose the generated EPG and played back multimedia data with the decoded video data and audio data.

[0039] 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 processing such as selection and / or superimposition under 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, providing 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.

[0040] 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 processing such as appropriate 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.

[0041] The digital interface unit 125 is an interface that outputs or inputs a packet stream including encoded digital video data and / or digital audio data. The digital interface unit 125 can directly output the packet stream that the first decoder unit 140S or the second decoder unit 140U inputs 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 the packet stream input from the outside 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 (accumulation) unit 110. Alternatively, the digital interface unit 125 may output the video data or audio data separated and extracted by the first decoder unit 140S or the second decoder unit 140U. Furthermore, video data and audio data input from the outside via the digital interface unit 125 may be input to the first decoder unit 140S and the second decoder unit 140U, or may be controlled to be stored in the storage (accumulation) unit 110.

[0042] 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.

[0043] 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, 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 may also be replaced by a keyboard or the like connected to the extension interface unit 124. The remote control can be replaced by a mobile information terminal 700 equipped with a remote control command transmission function.

[0044] 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 essential components. The broadcast receiving device 100 may also be an optical disc drive recorder such as a DVD (Digital Versatile Disc) recorder, a magnetic disc drive recorder such as an HDD recorder, or an STB (Set Top Box). It may also be a PC (Personal Computer) or tablet terminal equipped with a function for receiving digital broadcast services. 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 essential 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 the device to operate in the same manner as a television receiver or the like.

[0045] FIG. 2B is a block diagram showing an example of a detailed configuration of the first tuner / demodulator 130C.

[0046] The tuning / 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 tuning / 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.

[0047] 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.

[0048] 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.

[0049] FIG. 2C is a block diagram showing an example of a detailed configuration of second tuner / demodulator 130T.

[0050] 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 select two different channels of a digital broadcasting service transmitted using only horizontal polarization (or only vertical polarization).

[0051] 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.

[0052] The TMCC decoding unit 132H extracts the TMCC signal from the output signal of the tuning / detection unit 131H to obtain various TMCC information. The TMCC decoding unit 132V extracts the TMCC signal from the output signal of the tuning / detection unit 131V to obtain various TMCC information. Only one of the TMCC decoding unit 132H and the TMCC decoding unit 132V may be used. The obtained TMCC information is used to control each process in the subsequent stages.

[0053] 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 be capable of supporting modulation methods different from the above-mentioned modulation methods.

[0054] The stream reproduction units 134H and 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. The packet stream reproduced and output by the stream reproduction unit 134H is, for example, MPEG-2 TS, etc. The packet stream reproduced and output by the stream reproduction unit 134V is, for example, TLV including MPEG-2 TS or MMT packet stream, etc. Each may also be a packet stream of another format.

[0055] FIG. 2D is a block diagram showing an example of a detailed configuration of the third tuner / demodulator 130L.

[0056] 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 in the upper layer (UL) and the lower layer (LL) are different. The modulated waves in the upper layer are output to the demodulation unit 133S, and the modulated waves in the lower layer are output to the demodulation unit 133L.

[0057] 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 received by the TMCC decoding unit 132L may be either the modulated wave of the upper layer or the modulated wave of the lower layer.

[0058] 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.

[0059] FIG. 2E is a block diagram showing an example of a detailed configuration of the fourth tuner / demodulator 130B.

[0060] Channel selection / detection unit 131B inputs digital broadcast waves of the advanced BS digital broadcasting service or the advanced CS digital broadcasting service received by antenna 200B, and selects a channel based on a channel selection control signal. Other operations are similar to those of channel selection / detection unit 131H and channel selection / detection unit 131V, and detailed descriptions thereof will be omitted. Furthermore, TMCC decoding unit 132B, demodulation unit 133B, and stream reproduction unit 134B operate in the same manner as TMCC decoding unit 132H and TMCC decoding unit 132V, demodulation unit 133H and demodulation unit 133V, and stream reproduction unit 134V, respectively, and detailed descriptions thereof will be omitted.

[0061] FIG. 2F is a block diagram showing an example of a detailed configuration of the first decoder unit 140S.

[0062] Based on the control of main control unit 101, selection unit 141S selects and outputs one of the packet streams input from first tuner / demodulation unit 130C, second tuner / demodulation unit 130T, and third tuner / demodulation unit 130L. The packet streams input from first tuner / demodulation unit 130C, second tuner / demodulation unit 130T, and third tuner / demodulation unit 130L are, for example, MPEG-2 TS. CA descrambler 142S performs decryption processing of an encryption algorithm of a predetermined scrambling method based on various control information related to conditional access superimposed on the packet stream.

[0063] 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 included 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) acquired from a server device on the Internet 800 via the LAN communication unit 121. The demultiplexing unit 143S can output the packet streams input from the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, or the third tuner / demodulation unit 130L to the outside via the digital interface 125, and can receive a packet stream acquired from the outside via the digital interface 125.

[0064] The video decoder 145S performs processes such as decoding of 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 controller 101, and outputs video data at resolutions such as UHD (3840 horizontal pixels × 2160 vertical pixels), HD (1920 horizontal pixels × 1080 vertical pixels), and SD (720 horizontal pixels × 480 vertical pixels) as appropriate. Video data output at other resolutions may also be performed. The audio decoder 146S performs processes such as decoding of compressed and encoded audio information. It also performs downmixing under the control of the main controller 101, and outputs audio data with a number of channels such as 22.2ch, 7.1ch, 5.1ch, or 2ch. Note that a plurality of video decoders 145S and audio decoders 146S may be provided to simultaneously perform multiple decoding processes for video data and audio data.

[0065] The data decoder 144S performs processes such as generating an EPG based on program information data, generating a data broadcasting 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 that executes BML documents, and the data broadcasting 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.

[0066] 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.

[0067] FIG. 2G is a block diagram showing an example of a detailed configuration of the second decoder unit 140U.

[0068] 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 employ HEVC (High Efficiency Video Coding) or similar video compression methods. The CA descrambler 142U performs decryption processing of an encryption algorithm of a predetermined scrambling method based on various control information related to conditional access superimposed on the packet stream.

[0069] The demultiplexer 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 demultiplexer 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 demultiplexer 143U can output the packet streams input from the second tuner / demodulator 130T, the third tuner / demodulator 130L, or the fourth tuner / demodulator 130B to the outside via the digital interface 125, and can receive a packet stream acquired from the outside via the digital interface 125.

[0070] 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.

[0071] 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 reference numerals 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 FIG. 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 FIG. 2G, and therefore separate detailed explanation will be omitted.

[0072] [Software configuration of broadcast receiving device] 2H is a software configuration diagram of the broadcast receiving device 100, showing an example of the software configuration in the storage (accumulation) unit 110 (or ROM 103, the same applies below) and RAM 104. The 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. The 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 cooperation with external mobile terminal devices, server devices, etc., and a miscellaneous information storage area 1019 for storing various other information.

[0073] 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 the receiving function control unit 1102, the browser engine 1103, and the 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.

[0074] 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 being performed by the basic operation control unit 1101. Similar descriptions will be used for the other operation programs.

[0075] 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 (stream decoding), video data decoding, audio data decoding, etc. in the first decoder unit 140S and the second decoder unit 140H. The multimedia (MM) data playback unit 1102d mainly controls BML data playback, superimposed text data decoding, subtitle data decoding, and communication-linked application control in the first decoder unit 140S, and HTML data playback, multimedia screen generation, and communication-linked application control in the second decoder unit 140H. The EPG generation unit 1102e mainly controls EPG generation and display of the generated EPG in the first decoder unit 140S and the second decoder unit 140H. The presentation processing unit 1102f controls colorimetry conversion, dynamic range conversion, resolution conversion, audio downmixing, etc. in the first decoder unit 140S and the second decoder unit 140H, as well as the video selection unit 191 and the audio selection unit 194.

[0076] 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.

[0077] 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 I / F 125 or LAN communication unit 121, etc., and expiration date management for linked applications obtained based on the broadcast communication linkage function.

[0078] The operation programs may be stored in advance in the storage (accumulation) 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 extended interface unit 124 or the like. The operation programs may also be newly acquired or updated via broadcast waves.

[0079] [Broadcasting station server configuration] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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 if the basic operation control unit 4101 were to control each operation block. Similar descriptions will be used for the other operation programs.

[0084] 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.

[0085] 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 the program content of broadcast programs stored in the metadata storage area 4012 via the digital broadcast signal sending unit 460.

[0086] 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.

[0087] [Service provider server configuration] 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.

[0088] 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.

[0089] 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 a service provider, metadata related to the content, etc. The application storage area 5013 stores applications (operating programs and / or various data, etc.) required to realize each service of the broadcasting and communication cooperation system, which are distributed in response to requests from each television receiver.

[0090] 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.

[0091] For ease of explanation, the process of controlling each operation block by the main control unit 501 expanding the basic operation program 5001 stored in the storage unit 510 into the RAM 504 and executing it will be described below as being performed by the basic operation control unit 5101. Similar descriptions will be used for the other operation programs.

[0092] 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.

[0093] 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.

[0094] [Digital broadcasting waves] Here, an example of a digital broadcast wave received by the broadcast receiving device according to the embodiment of the present invention will be described.

[0095] Broadcast receiving device 100 is capable of receiving terrestrial digital broadcasting services that share at least some specifications with the Integrated Services Digital Broadcasting for Terrestrial Television Broadcasting (ISDB-T) system. Specifically, dual-polarized terrestrial digital broadcasting, which second tuner / demodulation unit 130T can receive, is advanced terrestrial digital broadcasting that shares some specifications with the ISDB-T system. Furthermore, layer division multiplexed terrestrial digital broadcasting, which third tuner / demodulation unit 130L can receive, is advanced terrestrial digital broadcasting that shares some specifications with the ISDB-T system. Note that current terrestrial digital broadcasting that first tuner / demodulation unit 130C can receive is terrestrial digital broadcasting in the ISDB-T system. Furthermore, advanced BS digital broadcasting and advanced CS digital broadcasting that fourth tuner / demodulation unit 130B can receive are digital broadcasting that differs from the ISDB-T system.

[0096] Here, the dual-polarized terrestrial digital broadcasting and hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment employ, as a transmission method, OFDM (Orthogonal Frequency Division Multiplexing), which is one of the multi-carrier methods, similar to the ISDB-T system. Since 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 makes it possible to reduce the influence of multipath within the range of the guard interval. This makes it possible to realize an SFN (Single Frequency Network), enabling effective use of frequencies.

[0097] In the dual-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 it. The transmission path coding for the dual-polarized terrestrial digital broadcasting and hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment is performed in units of OFDM segments. This allows for the definition of 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. FIG. 4B shows an example of hierarchical allocation of OFDM segments when the number of layers is set to three or two. In the example of FIG. 4B(1), the number of layers is 3, with layer A consisting of 1 segment (segment 0), layer B consisting of 7 segments (segments 1 to 7), and layer C consisting of 5 segments (segments 8 to 12). In the example of FIG. 4B(2), the number of layers is 3, with layer A consisting of 1 segment (segment 0), layer B consisting of 5 segments (segments 1 to 5), and layer C consisting of 7 segments (segments 6 to 12). In the example of FIG. 4B(3), the number of layers is 2, with layer A consisting of 1 segment (segment 0), and layer B consisting of 12 segments (segments 1 to 12). The number of OFDM segments in each layer, line coding parameters, etc. are determined according to organization information and transmitted by a TMCC signal, which is control information for assisting receiver operation.

[0098] Note that the following may be an example of the use of segment hierarchical allocations (1), (2), and (3) in FIG. 4B.

[0099] For example, the hierarchical allocation in 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 pixels horizontally by 1080 pixels vertically may transmit the same service using the above 7 segments of vertical polarization. In this case, this is also treated as hierarchical layer B.) Furthermore, it may be configured 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 using the above 5 segments of both horizontally and vertically polarized waves as hierarchical layer C. Details of this transmission will be described later. The transmission wave with this segment hierarchical allocation can be received, for example, by the second tuner / demodulator 130T of the broadcast receiving device 100.

[0100] For example, the hierarchical allocation of FIG. 4B(2) can be used as an example different from that of FIG. 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 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 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 by 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 by 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 transmitted 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.

[0101] For example, the hierarchical allocation of FIG. 4B(3) can be used in the hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment and in current terrestrial digital broadcasting. Specifically, when used in hierarchical division multiplexing terrestrial digital broadcasting, the one segment in the figure may be used as hierarchical layer A to transmit the current terrestrial digital broadcasting mobile reception service. Furthermore, the 12 segments in the figure may 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 by 1080 vertical pixels. 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, the one segment in the figure may be used as hierarchical layer A to transmit the current terrestrial digital broadcasting mobile reception service, and the 12 segments in the figure may be used as hierarchical layer B to transmit the current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels by 1080 vertical pixels. The transmission wave of the segment hierarchical allocation can be received by, for example, the first tuner / demodulator 130C of the broadcast receiving device 100 of this embodiment.

[0102] 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 and hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment. An information source encoder 411 encodes video, audio, and various data. A multiplexer / conditional access processor 415 multiplexes the video, audio, and various data encoded by the information source encoder 411, performs appropriate processing for conditional access, and outputs the multiplexed data as a packet stream. Multiple information source encoders 411 and multiplexer / 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 coding, and outputs the single packet stream as an OFDM transmission wave. The configuration shown in FIG. 4C is the same as that for the ISDB-T system in terms of generating and processing OFDM transmission waves, although the details of the information source coding and transmission path coding methods differ. Therefore, some of the multiple information source encoders 411 and multiplexer / conditional access processors 415 may be configured for ISDB-T terrestrial digital broadcasting services and some for advanced terrestrial digital broadcasting services, and packet streams of multiple different terrestrial digital broadcasting services may be multiplexed in the transmission path encoder 416. When the multiplexer / conditional access processor 415 is configured for ISDB-T terrestrial digital broadcasting services, it may generate an MPEG-2TS, which is a TSP (Transport Stream Packet) stream defined by MPEG-2 Systems. When the multiplexer / conditional access processor 415 is configured for advanced terrestrial digital broadcasting services, it may generate an MMT packet stream, a TLV stream including MMT packets, or a TSP stream defined in another system. Naturally, all of the multiple information source encoders 411 and multiplexer / conditional access processors 415 may be configured for advanced terrestrial digital broadcasting services, and all packet streams multiplexed in the transmission path encoder 416 may be packet streams for advanced terrestrial digital broadcasting services.

[0103] FIG. 4D shows an example of the configuration of the transmission path coding unit 416.

[0104] First, we will explain Figure 4D(1). Figure 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 Figure 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. Note that the outer coding process, power dispersal process, byte interleaving, inner coding process, and mapping process 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 so an example of three layers is shown in Figure 4D(1).) 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.

[0105] 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.

[0106] In the configuration example of FIG. 4D(2), outer code processing, power dispersal processing, byte interleaving, inner code processing, 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 FIG. 4D(2), not only horizontally polarized (H) OFDM transmission waves but also vertically polarized (V) OFDM transmission waves are generated, so 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 set differently for each layer, corresponding to the segment configuration described in FIG. 4B(1) or (2).

[0107] 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, in the part of the configuration of Figure 4D(2) where processing is performed for each layer, in the layer 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 in a manner compatible with the configuration of Figure 4D(1). On the other hand, in the part of the configuration of Figure 4D(2) where processing is performed for each layer, in the layer 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).

[0108] In addition, in the dual-polarized terrestrial digital broadcasting according to this embodiment, the allocation of the terrestrial digital broadcasting service to be transmitted can be switched between layers using TMCC information, which will be described later. Therefore, it is desirable to configure the processing such as outer code, inner code, mapping, etc. applied to each layer to be switchable using TMCC information.

[0109] For layers transmitting advanced terrestrial digital broadcasting services capable of transmitting video with a maximum resolution exceeding 1920 pixels horizontally and 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.

[0110] 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 specified by MPEG-2 Systems, which is adopted in current 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 specified by a system other than the TSP stream specified by MPEG-2 Systems, such as an MMT packet stream or a TLV including MMT packets, among the packet streams input to the transmission path coding unit 416. However, the TSP stream specified by MPEG-2 Systems may also be adopted for the advanced terrestrial digital broadcasting service.

[0111] 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 receiver 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.

[0112] 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 x 1080 pixels vertically, and the broadcast signal of the advanced terrestrial digital broadcasting service can be received and demodulated by the broadcast receiving device 100 according to an embodiment of the present invention.

[0113] 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.

[0114] 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 given 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 a guard interval is added, it is subjected to orthogonal modulation to become an OFDM transmission wave.

[0115] 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 the processing system for generating the modulated waves transmitted in the upper layer, and the processing system shown at the bottom is the processing system for generating the modulated waves transmitted in the lower layer. The data transmitted through the processing system for generating the modulated waves transmitted in the upper layer of Figure 4D(3) is the current terrestrial digital broadcasting mobile reception service or the current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically. The various processes in the processing system for generating the 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 in Figure 4D(1). Therefore, the modulated waves transmitted in the upper layer of Fig. 4D(3) are digital broadcast waves compatible with the current terrestrial digital broadcast mobile reception service and the current terrestrial digital broadcast service that transmits video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically. In contrast, the data transmitted through the processing system for generating the modulated waves transmitted in the lower layer of Fig. 4D(3) is an advanced terrestrial digital broadcast service that can transmit video with a maximum resolution of more than 1920 pixels horizontally by 1080 pixels vertically. For example, the processing of outer coding, inner coding, mapping, etc. can be configured to use more advanced processing than that adopted in the configuration of Fig. 4D(1).

[0116] The modulated wave transmitted on the lower hierarchical layers of Figure 4D(3) may be assigned to an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels by 1080 vertical pixels, with all 13 segments assigned to hierarchical layer A. Alternatively, the segment configuration of Figure 4B(3) may be used to transmit a current terrestrial digital broadcasting mobile reception service on 1-segment hierarchical layer A, and an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels by 1080 vertical pixels on 12-segment hierarchical layer B. In the latter case, as in Figure 4D(2), the configuration may be such that processing, from outer coding to time interleaving, can be switched between hierarchical layers A and B. As explained in Figure 4D(2), the hierarchical layer transmitting the current terrestrial digital broadcasting mobile reception service must maintain processing compatible with current terrestrial digital broadcasting.

[0117] 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.

[0118] 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. Moreover, 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.

[0119] 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 compatibility with 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 becomes longer, and for the same guard interval ratio (guard interval length / effective symbol length), the guard interval length becomes 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 becomes wider, making it possible to reduce the impact of inter-carrier interference due to Doppler shift that occurs in mobile reception, etc.

[0120] 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, inner code coding rate, and 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 for the "data" carrier. The SP signal, CP signal, TMCC signal, and AC signal use a modulation method different from the modulation method for the "data" carrier. Since these signals are signals for which noise resistance is more important than information volume, they use a modulation method that maps to a small-value constellation (BPSK or DBPSK, i.e., two states) with fewer states than the modulation method for the "data" carrier (both QPSK or higher, i.e., four or more states), thereby improving noise resistance.

[0121] Additionally, 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 OFDM broadcast wave generation process shown in Figures 4D(1), 4D(2), and 4D(3) of this embodiment, the "data" carrier modulation methods of 256QAM, 1024QAM, and 4096QAM are not used in the processing at the layer that requires compatibility with the current terrestrial digital broadcasting service. 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 acceptable to apply even higher-level modulation methods such as 256QAM (256 states), 1024QAM (1024 states), and 4096QAM (4096 states). It is also acceptable to adopt modulation methods different from these.

[0122] The modulation method for pilot symbol (SP and CP) carriers can be BPSK (2 states), which is compatible with current terrestrial digital broadcasting services. The modulation method for AC carriers and TMCC carriers can be DBPSK (2 states), which is also compatible with current terrestrial digital broadcasting services.

[0123] Furthermore, LDPC codes are not used as an inner code processing method in current terrestrial digital broadcasting services. Therefore, LDPC codes are not used in the processing of layers that require compatibility with current terrestrial digital broadcasting services in the OFDM broadcast wave generation processing according to FIGS. 4D(1), 4D(2), and 4D(3) of this embodiment. LDPC codes may be applied as inner codes to data transmitted in layers corresponding to advanced terrestrial digital broadcasting services. Furthermore, BCH codes are not used as an outer code processing method in current terrestrial digital broadcasting services. Therefore, BCH codes are not used in the processing of layers that require compatibility with current terrestrial digital broadcasting services in the OFDM broadcast wave generation processing according to FIGS. 4D(1), 4D(2), and 4D(3) of this embodiment. BCH codes may be applied as outer codes to data transmitted in layers corresponding to advanced terrestrial digital broadcasting services.

[0124] FIG. 4F shows an example of transmission signal parameters for each physical channel (6 MHz bandwidth) in the OFDM broadcast wave generation process shown in FIG. 4D(1), FIG. 4D(2), and FIG. 4D(3) of this embodiment. In the OFDM broadcast wave generation process shown in 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 shown 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).

[0125] 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, 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 used for error correction, with a shortened Reed-Solomon (204,188) code as the outer code and a punctured convolutional code with a constraint length of 7 and a coding rate of 1 / 2 as the mother code 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.

[0126] Furthermore, 204 symbols make up one frame, and one frame contains an integer number of TSPs. Transmission parameters are switched at the frame boundaries.

[0127] Pilot signals used 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 within a segment for synchronous modulation (QPSK, 16QAM, 64QAM, 256QAM, 1024QAM, 4096QAM, etc.). SPs are inserted into synchronous modulation segments and transmitted once every 12 carriers along the carrier number (frequency axis) and once every four symbols along the OFDM symbol number (time axis). 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 within a segment for differential modulation (DQPSK, etc.). CPs are continuous signals inserted at the left end of differential modulation segments and are used for demodulation.

[0128] AC1 and AC2 carry information on 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.

[0129] The arrangement images shown in Figures 4G and 4H are examples for mode 3, with carrier numbers ranging from 0 to 431, but for mode 1 and mode 2, the numbers range from 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.

[0130] [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 specified 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 are specified, w0 and w1, and w0 and w1 are transmitted alternately every frame. B17 to B19 are used to identify the segment format and identify 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.

[0131] 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. Note that the connected transmission phase correction amount is control information used in cases where a common transmission method is used, such as ISDB for Terrestrial Sound Broadcasting (ISDB-TSB), and detailed description thereof will be omitted here.

[0132] 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 that uses 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 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 or a hierarchical division multiplexing method makes it possible to simultaneously transmit 2K broadcast programs (broadcast programs with video of 1920 horizontal pixels by 1080 vertical pixels, but may also include broadcast programs with video of lower resolution) and 4K broadcast programs (broadcast programs with video of more than 1920 horizontal pixels by 1080 vertical pixels) within the same service.

[0133] The transmission parameter switching index counts down when switching transmission parameters to notify the receiver of the switching timing. This index normally has a value of "1111," and when switching transmission parameters, it is decremented by one for each frame starting from 15 frames before the switching. The switching timing is synchronized with the frame after "0000" is sent. After "0000," the index value returns to "1111." A countdown is performed when switching one or more of the parameters, such as the system identification of the TMCC information shown in Figure 5B, the transmission parameters 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, is performed. A countdown is not performed when switching only the start control signal of the TMCC information.

[0134] The start control signal (start flag for emergency alert broadcasting) is set to "1" when start control is being performed on the receiver for emergency alert broadcasting, and is set to "0" when start control is not being performed.

[0135] 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" if not. 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".

[0136] Figure 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. If this parameter is "000", it indicates that the modulation method is DQPSK. If it is "001", it indicates that the modulation method is QPSK. If it is "010", it indicates that the modulation method is 16QAM. If it is "011", it indicates that the modulation method is 64QAM. If it is "100", it indicates that the modulation method is 256QAM. If it is "101", it indicates that the modulation method is 1024QAM. If it is "110", it indicates that the modulation method is 4096QAM. If there are no unused layers or next information, this parameter is set to "111".

[0137] 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, set "1111". 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.

[0138] FIG. 5F shows an example of bit allocation for the frequency conversion process identifier. The frequency conversion process identifier is set to "0" when the converter 201T or 201L in FIG. 2A performs a frequency conversion process (in the case of a dual-polarized wave transmission system) or a frequency conversion / amplification process (in the case of a hierarchical division multiplexing transmission system), which will be described later. The frequency conversion process identifier 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 converter 201T or 201L when the converter 201T or 201L performs a frequency conversion process or a frequency conversion / amplification process. In this way, when the second tuner / demodulator 130T or the third tuner / demodulator 130L of the broadcast receiving device 100 receives the OFDM transmission wave, if the bit for the frequency conversion process identifier is "0," it can be determined that the OFDM transmission wave underwent a frequency conversion process or the like after being transmitted from the broadcast station.

[0139] 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." Alternatively, 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. Alternatively, 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.

[0140] 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.

[0141] 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 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".

[0142] 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 cannot 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 signals and AC signals. Note that the physical channels 13 to 52 are pre-allocated 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.

[0143] 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 during 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 would be unable to demodulate the advanced terrestrial digital broadcast using both polarized waves of the dual-polarized terrestrial digital broadcasting unless it could 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.

[0144] 5H shows an example of bit allocation for main signal identification, in which the bit for main signal identification is allocated to bit B117.

[0145] If the OFDM transmission wave being transmitted 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 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. In other words, in areas where the current terrestrial digital broadcasting service uses horizontally polarized transmission, the horizontal polarization is the primary polarization and the vertical polarization 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 vertical polarization is the primary polarization and the horizontal polarization is the secondary polarization for the dual-polarized terrestrial digital broadcasting service.

[0146] In the broadcast receiving device 100 that receives a transmission wave of a dual-polarized terrestrial digital broadcasting 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.

[0147] Although a detailed configuration example of the hierarchies, segments, and transmitted digital broadcast services of the dual-polarized terrestrial digital broadcasting according to this embodiment will be described later, when a current terrestrial digital broadcasting service is transmitted using a hierarchy consisting of segments included only in the primary polarization and an advanced terrestrial digital broadcasting service is transmitted using a hierarchy including segments included in both the primary polarization and the secondary polarization, it is possible to first perform an initial scan of the transmission waves transmitted in the primary polarization to complete the initial scan of the current terrestrial digital broadcasting service, and then perform an initial scan of the transmission waves transmitted in the secondary polarization to perform an 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 by the initial scan of the current terrestrial digital broadcasting service can be reflected in the settings made by the initial scan of the advanced terrestrial digital broadcasting service, which is preferable. The meanings of the main signal identification bits "1" and "0" may be reversed from those explained above.

[0148] Alternatively, instead of the main signal identification bit, a polarization direction identification bit may be used as one of the parameters of the TMCC information. Specifically, the broadcasting station sets 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 completing the initial scan of horizontally polarized transmission waves. The effect of this processing can be explained by replacing "primary polarization" with "horizontal polarization" and "secondary polarization" with "vertical polarization" in the part relating to the initial scan in the explanation of the main signal identification bits mentioned above, so a repeated explanation will be omitted.

[0149] The meanings of "1" and "0" in the polarization direction identification bits may be reversed from those explained above.

[0150] 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 receiving a dual-polarized terrestrial digital broadcast transmission wave according to an embodiment of the present invention, the first signal / second signal identification bit can be used to identify the polarization direction of the transmission wave being received. 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." The processing and effects in broadcast receiving device 100 can be explained 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 explanation of the main signal identification bit described above, and therefore will not be explained again.

[0151] The definition of the meanings of "1" and "0" in the first signal and second signal identification bits may be reversed from that explained above.

[0152] Next, in the transmission waves of the hierarchical division multiplexed 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 described above. Specifically, the upper and lower layer identification bit may be set to "1" in the TMCC information of the modulated wave transmitted in the upper layer, and the upper and lower layer identification bit may be set to "0" in the TMCC information of the transmission wave transmitted in the lower layer. Furthermore, if the broadcast wave being received is not an advanced terrestrial digital broadcasting service, this parameter may be set to "1."

[0153] In the hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment, in the process of generating an OFDM transmission wave at the broadcasting 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 / lower layer identification bit. For example, this identification process allows an initial scan of an advanced terrestrial digital broadcasting service transmitted on the lower layer to be performed after the initial scan of a current terrestrial digital broadcasting service transmitted on the upper layer has been completed, making it possible to reflect the settings resulting from the initial scan of the current terrestrial digital broadcasting service in the settings resulting from the initial scan of the advanced terrestrial digital broadcasting service. Furthermore, in the third tuner / demodulation unit 130L of the broadcast receiving device 100, the identification result can be used to switch between the processing of the demodulation unit 133S and the demodulation unit 133L.

[0154] In the following description of the dual-polarization 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. FIG. 5I shows an example of bit allocation for 4K signal transmission layer identification.

[0155] When the broadcast wave to be transmitted is a transmission wave of the dual-polarized terrestrial digital broadcasting service according to this embodiment, the 4K signal transmission layer identification bit may indicate whether or not 4K broadcast programs are transmitted using both horizontally polarized signals and vertically polarized signals for each of layers B and C. One bit is assigned to each of the settings for layer B and layer C. For example, when the 4K signal transmission layer identification bit for each of layers B and C is "0," this may indicate that 4K broadcast programs are transmitted using both horizontally polarized signals and vertically polarized signals for that layer. When the 4K signal transmission layer identification bit for each of layers B and C is "1," this may indicate that 4K broadcast programs are not transmitted using both horizontally polarized signals and vertically polarized signals for that layer. In this way, the broadcast receiving device 100 can use the 4K signal transmission layer identification bit to identify whether or not 4K broadcast programs are transmitted using both horizontally polarized signals and vertically polarized signals for each of layers B and C.

[0156] Furthermore, when 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 this parameter B119 is "0," the 4K broadcast program is to be transmitted on a lower layer. If this parameter B119 is "1," the 4K broadcast program is not to be transmitted on a lower 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 a 4K broadcast program is to be transmitted on a lower layer.

[0157] If this parameter is "0", the NUC (Non-Uniform Constellation) modulation method can be used as the carrier modulation mapping method in addition to the basic modulation method shown in Fig. 5C. In this case, the current / next information of the transmission parameter supplementary information for layer B / layer C can be transmitted using AC1 or the like.

[0158] Also, if the broadcast wave being transmitted is not an advanced terrestrial digital broadcasting service, these parameters may be set to "1".

[0159] The definitions of "0" and "1" of the 4K signal transmission layer identification bits described above may be reversed.

[0160] 5J shows an example of bit allocation for the additional layer transmission identification. The additional layer transmission identification bits may be used to 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 in the secondary polarization are to be used as virtual layers D and E, respectively.

[0161] For example, in the example shown in the figure, the bit assigned to B120 is the layer D transmission identification bit, and when this parameter is "0," layer B transmitted using the secondary polarization is used as virtual layer D. To be precise, 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 layer B transmitted using the primary polarization are treated as layer D, a different layer from layer B transmitted using the primary polarization. When this parameter is "1," layer B transmitted using the secondary polarization is used as layer B, not as virtual layer D.

[0162] For example, the bit assigned to B121 is the 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 are 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.

[0163] 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 Fig. 5J, it is possible to operate new layers (layers D and E in the example of Fig. 5J) beyond the number of layers that is limited to three (layers A, B, and C) in current terrestrial digital broadcasting.

[0164] 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.

[0165] 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.

[0166] 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 hierarchical division multiplexing transmission method, this parameter may be configured to be set to "1".

[0167] 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 at least the TMCC information of the secondary polarization, all of the above-mentioned processes can be realized.

[0168] 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.

[0169] 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.

[0170] 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 "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."

[0171] 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.

[0172] In the current terrestrial digital broadcasting system for 2K broadcasting, an identification bit that transmits a coding rate dedicated to "convolutional code" is transmitted. However, in the digital broadcasting according to this embodiment, the advanced terrestrial digital broadcasting service for 4K broadcasting can be broadcasted together with the 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.

[0173] 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.

[0174] 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 selection of coding rates suitable for each coding method.

[0175] Specifically, in the example of Figure 5K, when the identification bits are "000", if the inner code is a convolutional code, the coding rate is 1 / 2, and if the inner code is an LDPC code, the coding rate is 2 / 3. When the identification bits are "001", if the inner code is a convolutional code, the coding rate is 2 / 3, and if the inner code is an LDPC code, the coding rate is 3 / 4. When the identification bits are "010", if the inner code is a convolutional code, the coding rate is 3 / 4, and if the inner code is an LDPC code, the coding rate is 5 / 6. When the identification bits are "011", if the inner code is a convolutional code, the coding rate is 5 / 6, and if the inner code is an LDPC code, the coding rate is 2 / 16. When the identification bits are "100", if the inner code is a convolutional code, the coding rate is 7 / 8, and if the inner code is an LDPC code, the coding rate is 6 / 16. When the identification bits are "101", if the inner code is a convolutional code, the coding rate is undefined, and if the inner code is an LDPC code, the coding rate is 10 / 16. If the identification bits are "110", it indicates that the inner code is undefined if it is a convolutional code, or that the coding rate is 14 / 16 if it is an LDPC code. If there are no unused layers or next information, this parameter is set to "111".

[0176] Whether the inner code of the 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 can be performed using the identification bit described in FIG. 5D or FIG. 5I. Here, if the target terrestrial digital broadcasting service is a current terrestrial digital broadcasting service, the inner code can be identified as a convolutional code. Also, if the target terrestrial digital broadcasting service is an advanced terrestrial digital broadcasting service, the inner code can be identified as an LDPC code.

[0177] 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.

[0178] According to the bits for identifying the coding rate of error correction shown in FIG. 5K, which has been described above, it is possible to prevent an increase in the number of identification bits while supporting a plurality of inner coding methods, and this is preferable.

[0179] 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 layer 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 secondary polarization or a transmission wave transmitted in a lower layer.

[0180] In the above description, an example has been described in which a parameter for identifying a frequency conversion process, a parameter for identifying a main signal, a parameter for identifying a polarization direction, a parameter for identifying a first or second signal, a parameter for identifying upper and lower layers, a parameter for identifying a 4K signal transmission layer, and a parameter for identifying an additional layer transmission 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 fewer states than the modulation method of the data carrier.

[0181] [AC signal] The AC signal is an additional information signal related to broadcasting, and includes additional information related to the transmission control of modulated waves or earthquake warning information. Earthquake warning information is transmitted using the AC carrier of segment 0. On the other hand, additional information related to the transmission control of modulated waves 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 the transmission control of modulated waves or earthquake warning information.

[0182] FIG. 6B shows an example of bit allocation for the 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 the transmission control of the modulated wave is being transmitted using B4 to B203 of the AC signal. Additional information related to the transmission control of the modulated wave may also be 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.

[0183] AC signals B4 to B203 are used to transmit additional information related to the transmission control of modulated waves or to transmit earthquake alarm information.

[0184] The transmission of additional information related to 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 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 layer D / virtual layer E 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.

[0185] Earthquake warning information may be transmitted 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 code as the 13 bits (B4 to B16) excluding the first 3 bits of the synchronization signal of the TMCC signal. When the configuration identification of the AC signal indicates that earthquake warning information is to be transmitted, the 16-bit code combining the configuration identification and synchronization signal becomes a 16-bit synchronization word that is the same as 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." If the start / end flag is "11," the update flag will also be "11."

[0186] Figure 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)". When this parameter is "001", it means "earthquake motion warning detail information (applicable area)". When this parameter is "010", it means "earthquake motion warning detail information test signal (applicable area)". When this parameter is "011", it means "earthquake motion warning detail information test signal (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".

[0187] The earthquake motion warning detail information consists 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 the current time when the earthquake motion warning information is sent, information indicating the area covered by the earthquake motion warning, and the latitude / longitude / seismic intensity of the epicenter of the earthquake covered by the earthquake motion warning. An example of bit allocation for 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 codes for identifying broadcasters using the bits of the earthquake motion warning detail information. An example of bit allocation for the earthquake motion warning detail information when the signal identification is "111" is shown in Figure 6F.

[0188] 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.

[0189] 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 end the display of an application and switch to a display related to the earthquake motion warning or broadcast program video.

[0190] 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 synchronization signal of the TMCC signal. If the AC signal configuration identification indicates that additional information related to modulated wave transmission control is to be transmitted, the 16-bit code combining the configuration identification and synchronization signal becomes a 16-bit synchronization word equivalent to the TMCC synchronization signal. The current information indicates the current information on transmission parameter additional information when transmitting 4K broadcast programs on layer B or C, and the current information on transmission parameters related to virtual layer D or virtual layer E. The next information indicates the post-switching information on transmission parameter additional information when transmitting 4K broadcast programs on layer B or C, and the post-switching information on transmission parameters related to virtual layer D or virtual layer E.

[0191] In the example of FIG. 6G, current information B18 to B30 is current information of layer B transmission parameter additional information, indicating the current information of the transmission parameter additional information when transmitting a 4K broadcast program on layer B. Current information B31 to B43 is current information of layer C transmission parameter additional information, indicating the current information of the transmission parameter additional information when transmitting a 4K broadcast program on layer C. Next information B70 to B82 is information after the transmission parameters of layer B transmission parameter additional information have been switched, indicating the information after the transmission parameters of the transmission parameter additional information when transmitting a 4K broadcast program on layer B. Next information B83 to B95 is information after the transmission parameters of layer C transmission parameter additional information have been switched, indicating the information after the transmission parameters of the transmission parameter additional information when transmitting a 4K broadcast program on layer C. Here, the transmission parameter additional information is transmission parameters related to modulation 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.

[0192] In the example of Figure 6G, current information B44 to B56 is current information on transmission parameters for the virtual D layer when the virtual D layer is operated. Current information B57 to B69 is current information on transmission parameters for the virtual E layer when the virtual E layer is operated. Furthermore, next information B96 to B108 is information after switching of transmission parameters for the virtual D layer when the virtual D layer is operated. Current information B109 to B121 is information after switching of transmission parameters for the virtual E layer when the virtual E layer is operated. The transmission parameters for the virtual D layer and the parameters stored in the transmission parameters for the virtual E layer may be the same as those shown in Figure 5C.

[0193] The virtual layer D and the virtual layer E 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 Fig. 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 layer D and the virtual layer E are stored in the AC information as shown in Fig. 6G, rather than in the TMCC information.

[0194] This makes it possible to transmit to a receiving device modulation information for the new virtual layers D and E while maintaining compatibility of TMCC information with current terrestrial digital broadcasting. As a result, when layers B and C of 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 transmission parameters for the virtual layers D and E of the transmission waves transmitted in the secondary polarization differently from the transmission parameters for layers B and C of the transmission waves transmitted in the primary polarization.

[0195] Note that, if the virtual D layer or virtual E layer is not used, the information on the transmission parameters for the unused layers can be ignored by the broadcast receiving device 100. For example, if the additional layer transmission identification parameter in the TMCC information in Figure 5J indicates "1" for the virtual D layer or 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 entered in the transmission parameters shown in Figure 6G for the unused virtual D layer or virtual E layer.

[0196] Next, the transmission parameter additional information explained in FIG. 6G will be described in detail.

[0197] 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.

[0198] 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 4K broadcast programs (advanced terrestrial digital broadcasting service) on layer B or 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 4K broadcast programs on layer B or 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 4K broadcast programs on layer B and C. Other combinations may also be set and selected.

[0199] Furthermore, when transmitting 4K broadcast programs on layers B and C, it is possible to adopt not only a uniform constellation but also a non-uniform constellation (NUC) as the carrier modulation mapping scheme. FIG. 6J shows an example of bit allocation for a constellation format. When this parameter is "000," the carrier modulation mapping scheme 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 scheme 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 scheme, its coding rate, and other factors. 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 scheme, the parameters of the error correction scheme, 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.

[0200] [Transmission method 1 for advanced terrestrial digital broadcasting services] 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 system will be described as an example of a transmission system for advanced terrestrial digital broadcasting services according to an embodiment of the present invention. The dual-polarized transmission system according to an embodiment of the present invention shares some specifications with the current terrestrial digital broadcasting system. For example, 13 segments within an approximately 6 MHz band corresponding to one physical channel are divided, with seven segments allocated to transmitting 2K (1920 horizontal pixels x 1080 vertical pixels) broadcast programs, five segments allocated to transmitting 4K broadcast programs, and one segment allocated 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 equivalent to 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, making them receivable 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 allocated to each broadcast may differ from that stated above.

[0201] 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 for transmitting broadcast waves for the terrestrial digital broadcasting service. There are 40 physical channels in this frequency band, from 13 to 52 ch, and each physical channel has 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.

[0202] Figure 7A shows two examples of 13-segment allocation, (1) and (2). In example (1), 2K broadcast programs are transmitted using segments 1 to 7 (layer B) of the horizontally polarized signal. 4K broadcast programs are 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 of the TMCC signal, the additional layer transmission identification parameter, or the like, as already explained. Broadcast receiving device 100 can identify how to handle segments 1 to 7 (layer B) of the vertically polarized signal using these parameters. Furthermore, a 2K broadcast program transmitted using layer B of the horizontally polarized signal and a 4K broadcast program transmitted using layer C of the horizontally and vertically polarized signal may be simulcasts that transmit the same broadcast program at different resolutions, or may transmit broadcast programs with different content. Segment 0 of the horizontally and vertically polarized signal transmits the same OneSeg broadcast program.

[0203] Example (2) in 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 2K broadcast program as 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 2K broadcast program than 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 other data or may be unused. The identification information is similar to that in example (1), and therefore will not be described again.

[0204] 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.

[0205] FIG. 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 a 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 FIG. 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 FIG. 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.

[0206] 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 unit 100F1 via coaxial cable 202T1. Meanwhile, 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 unit 100F2 via coaxial cable 202T2. An F-type connector is generally used as the connector connecting the antenna (coaxial cable) to the television receiver.

[0207] Here, 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 the inability of channel selection / detection unit 131H and channel selection / detection unit 131V to distinguish whether the input broadcast signal is a horizontally polarized signal or a vertically polarized signal. To prevent this 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 that transmits 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 that transmits a horizontally polarized signal. Alternatively, channel selection / detection unit 131H and channel selection / detection unit 131V may be controlled to distinguish 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.

[0208] FIG. 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. The configuration shown in FIG. 7B, in which broadcast receiving device 100 includes two broadcast signal input connectors and uses two coaxial cables to connect antenna 200T to broadcast receiving device 100, may not be ideal in terms of equipment cost and handling of cable wiring. Therefore, in the configuration shown in FIG. 7C, a horizontally polarized signal received by antenna 200T's horizontally polarized wave receiving element and a vertically polarized wave signal received by antenna 200T's vertically polarized wave receiving element are input to converter 201T, and converter 201T and broadcast receiving device 100 are connected by a single coaxial cable 202T3. The broadcast signal input from connector 100F3 is branched and input to tuning / detection unit 131H and tuning / detection unit 131V. The connector section 100F3 may have a function of supplying operating power to the conversion section 201T.

[0209] 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 or the like. 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. However, 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.

[0210] 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 waves 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 a horizontally polarized signal.

[0211] 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 not to frequency convert the signal transmitted in the primary polarization but to frequency convert the signal transmitted in the secondary polarization.

[0212] Furthermore, when a signal transmitted using the secondary polarization is frequency converted, it is desirable to make the frequency band of the converted signal 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 makes it possible to more efficiently perform processes such as reflecting the settings obtained by the initial scan of a current terrestrial digital broadcasting service in the settings obtained by the initial scan of an advanced terrestrial digital broadcasting service.

[0213] 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.

[0214] The frequency band after the frequency conversion process is preferably between 710 and 1032 MHz. That is, when simultaneously receiving a terrestrial digital broadcasting service and a BS / CS digital broadcasting service, 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 below 770 MHz (the band equivalent to UHF channel 62 or below) 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.

[0215] Furthermore, it is preferable to set the bandwidth of the region between the frequency band before and after conversion by the frequency conversion process (part a in the figure) to be an integral 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 by the frequency conversion process all at once.

[0216] 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, to correctly reproduce 4K broadcast programs, the receiving side must correctly identify the combination of physical channels for broadcast signals transmitted with horizontal polarization and broadcast signals transmitted with vertical polarization. Even when frequency conversion processing is performed and broadcast signals transmitted with horizontal polarization and broadcast signals transmitted with vertical polarization 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 broadcast signals transmitted with horizontal polarization and broadcast signals transmitted with vertical polarization 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 FIGS. 5F to 5J. This allows the broadcast receiving device 100 according to the embodiment to properly receive, demodulate, and reproduce 4K broadcast programs.

[0217] Although the examples of FIGS. 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.

[0218] As mentioned above, the terrestrial digital broadcasting waves transmitted by the above-described dual-polarized transmission method 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.

[0219] <Pass-through transmission method for advanced terrestrial digital broadcasting services> 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 transmitted to a CATV distribution system using the same signal method as the original signal, or by frequency conversion.

[0220] The pass-through method is classified into two types: (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 the VHF, MID, SHB, or UHF band frequency set by the CATV facility manager. The equipment constituting the receiving amplifier for signal processing of the first method, or the equipment constituting the receiving amplifier and frequency converter for signal processing of the second method, is an OFDM signal processor (OFDM-SP).

[0221] 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 that would be performed 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.

[0222] When the pass-through transmission method of the first 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 is transmitted at the same frequency as the transmission signal frequency. 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 is transmitted after undergoing frequency conversion processing similar to that described in FIG. 7D (processing to convert the broadcast signal transmitted using vertical polarization to a frequency band higher than the 470-770 MHz frequency band corresponding to UHF channels 13-62). This processing prevents overlapping of the frequency bands of the broadcast signal transmitted using horizontal polarization and the broadcast signal transmitted using vertical polarization, enabling signal transmission over a single coaxial cable (or optical fiber cable). The transmitted signal can be received by the broadcast receiving device 100 of 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.

[0223] 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 broadcast receiving device 100. Fig. 7H also shows an example of the frequency conversion process used in this case.

[0224] 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 processing to a 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 processing similar to that described in Figure 7D (processing to convert the broadcast signal transmitted using vertical polarization into a frequency band higher than the 470-770 MHz frequency band corresponding to UHF channels 13-62) before being transmitted. The frequency conversion processing shown in Figure 7H, unlike that of Figure 7F, performs frequency conversion so 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 and relocated 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 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 broadcast receiving device 100 of this embodiment is the same as that described in Figure 7D, so a repeated description will be omitted.

[0225] As another variation of the frequency conversion process of cable television station headend equipment 400C in FIG. 7G, the broadcast signal at the time of pass-through output after frequency conversion may be changed from the state shown in FIG. 7H to the state shown in FIG. 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 frequency conversion processing to the frequency set by the CATV facility manager may be performed before transmission. In the example of FIG. 7I, frequency conversion is performed so that both the horizontally polarized broadcast signal and the vertically polarized broadcast signal are rearranged within the range of 90 to 770 MHz (VHF channel 1 to UHF channel 62). Since the frequency band beyond UHF channel 62 is not used, the frequency band utilization efficiency of the broadcast signal is higher than that of FIG. 7H.

[0226] Furthermore, since 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 Fig. 7I. In this case, as shown in the example of Fig. 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.

[0227] 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.

[0228] As described above, the terrestrial digital broadcasting waves of the dual-polarized transmission method 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.

[0229] [Transmission method 2 for advanced terrestrial digital broadcasting services] 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-described method. 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 means of modulation multi-level etc., the 2K broadcasting wave is canceled using a reception technology compatible with LDM (hierarchical division multiplexing) technology, and reception is performed using the remaining 4K broadcasting wave.

[0230] 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. Note that 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. Note that 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).

[0231] 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 a radio tower 300L, which is a broadcasting station facility, is a transmitting antenna that transmits a broadcast signal that is a multiplexed combination of 2K broadcasting on an upper layer and 4K broadcasting 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.

[0232] The broadcast signal received by the antenna 200L is input from the connector 100F4 to the channel selection / 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 channel selection / detection unit 131L is unable to properly receive 4K broadcast waves, particularly those in lower hierarchical layers.

[0233] 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 broadcast signal and the 4K broadcast signal, while also avoiding the effects of broadcast signal attenuation during transmission via the coaxial cable. Note that the converter 201L and the 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.

[0234] 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. All of these are the same as those described in the embodiment relating to frequency conversion already described, and therefore will not be described again.

[0235] 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 by 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 by 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 by using the 4K signal transmission layer identification bit of the TMCC information described in FIG. 5I. While it is possible to perform these identification processes 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, for example, it is possible to speed up the initial scan of the broadcast receiving device 100.

[0236] As already explained, the tuning / detection unit 131L of the third tuner / demodulation unit 130L of the broadcast receiving device 100 in this embodiment of the present invention has a receiving function compatible with LDM (layer division multiplexing) technology, so the conversion unit 201L shown in Figure 8C is not necessarily required between the antenna 200L and the broadcast receiving device 100.

[0237] 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.

[0238] [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, 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 in FIG. 4D(1) is MPEG-2 TS, and the format of the stream transmitted by the OFDM transmission wave in FIG. 4D(2) and FIG. 4D(3) at the layer where the current terrestrial digital broadcasting service is transmitted is MPEG-2 TS. Also, the format of the stream obtained by demodulating the transmission wave with the first tuner / demodulator 130C of the broadcast receiving device 100 in FIG. 2 is MPEG-2 TS. Also, 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.

[0239] MPEG-2 TS is characterized by multiplexing video, audio, and other components that make up a program together with control signals and clocks 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 used in 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 broadband network functions, such as the acquisition of additional content via broadband networks, processing in server devices, and presentation processing in collaboration with mobile terminal devices.

[0240] 9A shows an example of a protocol stack for signals transmitted in a broadcasting system that uses MPEG-2 TS. In MPEG-2 TS, PSI, SI, and other control signals are transmitted in section format.

[0241] [Control signals for broadcasting systems using the MPEG-2 TS format] The control information in the MPEG-2 TS format includes tables used primarily for program service information and tables used for other purposes. Tables are transmitted in section format, and descriptors are placed within the tables.

[0242] <Tables used in program service information> 9B shows a list of tables used in the program service information of the MPEG-2 TS broadcasting system. In this embodiment, the following tables are used as the program service information.

[0243] (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)

[0244] (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) Table set by the operator

[0245] <Tables used in digital broadcasting> 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.

[0246] (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

[0247] <Descriptors used in program service information> 9D, 9E, and 9F show a list of descriptors used in the program service information of an MPEG-2 TS broadcasting system. In this embodiment, the following descriptors are used in the program service information.

[0248] (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

[0249] (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

[0250] (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

[0251] (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

[0252] (41) Event Group Descriptor (42) SI Transmission 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

[0253] (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

[0254] (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) Descriptors set by the operator

[0255] <Descriptors used in digital broadcasting> 9G shows a list of descriptors used in addition to the program service information of the MPEG-2 TS broadcasting system. In this embodiment, the following descriptors are used in addition to the program service information.

[0256] (1) Partial Transport Stream Descriptor (Partial Transport Stream Descriptor) (2) Network Identification Descriptor (3) Partial Transport Stream Time Descriptor (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 tags Descriptor (Deferred Association tags Descriptor) (11) Network Download Content Descriptor (Network Download Content Descriptor) (12) Download Protection Descriptor (13) CA Startup Descriptor (14) Descriptors set by the operator

[0257] <Descriptors used in INT> Figure 9H shows a list of descriptors used in INT of the MPEG-2 TS broadcast system. In this embodiment, the following descriptors are used as descriptors used in INT. Note that the descriptors used in the above program arrangement information and the descriptors used other than the program arrangement information are not used in INT.

[0258] (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 (IP / MAC Platform Provider Name Descriptor) (6) IP / MAC Stream Location Descriptor (7) Descriptor set by the operator

[0259] <Descriptor used in AIT> Figure 9I shows a list of descriptors used in the AIT of the MPEG-2 TS broadcast system. In this embodiment, the following descriptors are used as the descriptors used in the AIT. Note that the descriptors used in the above program arrangement information and the descriptors used other than the program arrangement information are not used in INT.

[0260] (1) Application Descriptor (2) Transport Protocol Descriptor (3) Simple Application Location Descriptor (Simple Application Location Descriptor) (4) Application Boundary and Permission Descriptor (Application Boundary and Permission Descriptor) (5) Autostart Priority Descriptor (6) Cache Control Info Descriptor (7) Randomized Latency Descriptor (8) External application control descriptor (External Application Control Descriptor) (9) Playback Application Descriptor (10) Simple Recording and Playback Application Location Descriptor (Simple Playback Application Location Descriptor) (11) Application Expiration Descriptor (12) Descriptors set by the operator

[0261] [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 streams transmitted in the layers where advanced terrestrial digital broadcasting services are transmitted is, in principle, the MMT method. Furthermore, among the streams obtained by demodulating the transmission waves using the second tuner / demodulator 130T of the broadcast receiving device 100 shown in FIG. 2, the method of the streams corresponding to the layers where advanced terrestrial digital broadcasting services are transmitted is, in principle, the MMT method. Similarly, among the streams obtained by demodulating the transmission waves using the third tuner / demodulator 130L, the method of the streams corresponding to the layers where advanced terrestrial digital broadcasting services are transmitted is, in principle, the MMT method. As a modified example, an MPEG-2 TS stream may be used for the advanced terrestrial digital broadcasting service. Furthermore, the method of the streams obtained by demodulating the transmission waves using the fourth tuner / demodulator 130B is the MMT method.

[0262] 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.

[0263] The video and audio signals of a broadcast program are coded as MFU (Media Fragment Unit) / MPU (Media Processing Unit), placed on the MMTP (MMT Protocol) payload, converted into MMTP packets, and transmitted in IP packets. In addition, the signals of data content and subtitles related to the broadcast program are also formatted in MFU / MPU, placed on the MMTP payload, converted into MMTP packets, and transmitted in IP packets.

[0264] For transmission of MMTP packets, UDP / IP (User Datagram Protocol / Internet Protocol) is used on broadcast transmission channels, and UDP / IP or TCP / IP (Transmission Control Protocol / Internet Protocol) is used on communication lines. In addition, TLV multiplexing may be used on broadcast transmission channels for efficient transmission of IP packets.

[0265] Figure 10A shows the MMT protocol stack on a broadcast transmission path. Figure 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 in the 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.

[0266] [Control Signal of a Broadcasting System Using the MMT Method] As described above, in the MMT method, TLV-SI and MMT-SI are prepared as control information. TLV-SI is composed of a table and descriptors. The table is transmitted in section format, and the descriptors are arranged within the table. MMT-SI is composed of three layers: a message that stores tables and descriptors, a table that has elements and attributes indicating specific information, and a descriptor that indicates more detailed information.

[0267] [Tables Used in TLV-SI] Fig. 10C shows a list of tables used in TLV-SI of the MMT method broadcasting system. In this embodiment, the following tables are used as TLV-SI tables.

[0268] (1) Network Information Table for TLV (2) Address Map Table (3) Table Set by the Operator

[0269] [Descriptors Used in TLV-SI] Fig. 10D shows a list of descriptors used in TLV-SI of the MMT method broadcasting system. In this embodiment, the following descriptors are used as TLV-SI descriptors.

[0270] (1) Service List Descriptor (2) Satellite Delivery System Descriptor (3) System Management Descriptor (4) Network Name Descriptor (5) Remote Control Key Descriptor (6) Descriptor Set by the Operator

[0271] <Message used in MMT - SI> Figure 10E shows a list of messages used in MMT - SI of the MMT - based broadcast system. In this embodiment, the following messages are used as MMT - SI messages.

[0272] (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 operator

[0273] Figure 10F shows a list of tables used in MMT - SI of the MMT - based broadcast system. In this embodiment, the following tables are used as MMT - SI tables.

[0274] (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)

[0275] (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) DDM table (Data Directory Management Table) (17) DAM table (Data Asset Management Table) (18) DCC table (Data Content Configuration Table) (19) EMT (Event Message Table) (20) Tables set by the operator

[0276] <Descriptors used in MMT-SI> Figures 10G, 10H, and 10I show a list of descriptors used in MMT-SI of the MMT-based broadcast system. In this embodiment, the following are used as descriptors of MMT-SI.

[0277] (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

[0278] (11) MH-MPEG-4 Audio Descriptor (12) MH-MPEG-4 Audio Extension Descriptor (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

[0279] (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

[0280] (31) MH-Type Descriptor (32) MH-Info Descriptor (33) MH-Expire Descriptor (34) MH-CompressionType Descriptor (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

[0281] (41) MPU Extended Timestamp Descriptor (42) MPU Download Content Descriptor (43)MH-Network Download Content Descriptor (MH-Network Download Content Descriptor) (44) Application Descriptor (MH-Application Descriptor) (45) MH-Transport Protocol Descriptor (46)MH-Simple Application Location Descriptor (MH-Simple Application Location Descriptor) (47) Application Boundary Permission Setting Descriptor (MH-Application Boundary and Permission Descriptor) (48) MH-Autostart Priority Descriptor (49) MH-Cache Control Info Descriptor (50) MH-Randomized Latency Descriptor

[0282] (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

[0283] (61) Emergency News Descriptor (62) MH-CA Contract Info Descriptor (63) MH-CA Service Descriptor (64)MH-External Application Control Descriptor (MH-External Application Control Descriptor) (65)MH-Recording / Playback Application Descriptor (MH-Playback Application Descriptor) (66) MH-Simple Recording and Playback Application Location Descriptor (MH-Simple Playback Application Location Descriptor) (67) MH-Application Expiration Descriptor (MH-Application Expiration Descriptor) (68) Related Broadcaster Descriptor (69) Multimedia Service Descriptor (70) Descriptor Set by Operator

[0284] <Relationship between Data Transmission and Each Control Information in MMT System> Figure 10J shows the relationship between data transmission and a representative table in a broadcast system of the MMT system.

[0285] In the broadcast system of the MMT system, data transmission can be performed through multiple paths such as a TLV stream via a broadcast transmission path or 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 a video asset including a series of video MPUs and an audio asset including a series of audio MPUs. Further, a subtitle asset including a series of subtitle MPUs, a character super asset including a series of character super MPUs, a data asset including a series of data MPUs, etc. may also be included. These various assets are associated in package units by an MPT (MMT Package Table) stored in a PA message and transmitted. Specifically, the package ID and the asset ID of each asset included in the package may be associated and described in the MPT.

[0286] The assets constituting the package can be only the assets in the TLV stream, but as shown in Figure 10J, assets transmitted in the IP data flow of the communication line can also be included. This can be realized by including the location information of each asset included in the package in the MPT so that the broadcast receiving apparatus 100 can grasp the reference destination of each asset. As the location information of each asset, (1) Data multiplexed in the same IP data flow as MPT (2) Data multiplexed in IPv4 data flow (3) Data multiplexed in IPv6 data flows (4) Data multiplexed into broadcast MPEG2-TS (5) Data multiplexed in MPEG2-TS format within the IP data flow (6) Data at the specified URL It is possible to specify various data transmitted via various transmission paths, such as:

[0287] 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 an 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.).

[0288] [Channel setting process for broadcast receiving device] <Initial scan> In current terrestrial digital broadcasting, the network ID is different for each transmission master, and information about other stations is generally not recorded in the NIT. Therefore, the broadcast receiving device 100 of the embodiment of the present invention, which is compatible with current terrestrial digital broadcasting, needs to have a function for searching (scanning) all receivable channels at the receiving point for the terrestrial digital broadcasting of the 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 hierarchical 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.

[0289] 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, there is no need to perform an initial scan or a rescan, which will be described later.

[0290] <Rescan> The broadcast receiving device 100 according to the embodiment of the present invention has a rescanning function to prepare for cases where a new station opens, a new relay station is installed, the receiving location of a television receiver is changed, etc. When changing existing setting information, the broadcast receiving device 100 can notify the user of this.

[0291] <Example of operation during initial / rescan> 11A shows an example of an operation sequence of the channel setting process (initial / 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.

[0292] 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 I / F 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 therebetween; the same applies below) to tune to the set frequency (S102).

[0293] 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 and performs reception confirmation processing. If a C / N of a predetermined level or higher is not obtained (S104: No), it proceeds to processing S111.

[0294] 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. It also 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. It also acquires a list of service IDs from the service list descriptor.

[0295] 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 the process of S106 has already been acquired (S107). If the transport stream ID acquired in the process of S106 has not already been acquired (S107: No), the various information acquired in the process of S106 is added to the service list in association with the transport stream ID (S108). If the transport stream ID acquired in the process of S106 has already been acquired (S107: Yes), the BER acquired in the process of S105 is compared with the BER when the transport stream ID listed in the service list was acquired (S109). If the BER acquired in the process of S105 is better (S109: Yes), the service list is updated with the various information acquired in the process of S106 (S110). If the BER acquired in the process of S105 is not better (S109: No), the various information acquired in the process of S106 is discarded.

[0296] 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, as described below.

[0297] 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.

[0298] 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 duplication of remote control keys, the user may be notified of this and prompted to change the remote control key settings (S114). The service list created / updated in the above process is stored in a non-volatile memory such as ROM 103 or storage (accumulation) unit 110 of broadcast receiving device 100.

[0299] 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. 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.

[0300] 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, when 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 frequency value is increased by +6 MHz in the process of S112.

[0301] Furthermore, when the broadcast receiving device 100 is receiving broadcast waves including an advanced terrestrial digital broadcasting service, the device controls the scanning of 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 have been 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 frequency conversion process or frequency conversion amplification process described above has not been performed, the device may be controlled 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.

[0302] Furthermore, when the broadcasting system according to an embodiment of the present invention has the configuration shown in FIG. 7C and the broadcast receiving device 100 receives 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 frequency conversion processing is performed on the transmission wave 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, the tuning / detection units 131H and 131V may perform the operational sequence of FIG. 11A in parallel, thereby synchronizing the loop of frequency increase S112 in the operational 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 at the same time, 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.

[0303] Similarly, if broadcast receiving device 100 has the configuration shown in Fig. 8B and further includes a plurality of tuner / demodulators (channel selection / detection units), i.e., a so-called double tuner configuration (for example, a configuration including a plurality of third tuner / demodulators 130L), and is receiving an advanced terrestrial digital broadcasting service using a hierarchical division multiplexing transmission method, one of the dual tuners may be configured to scan the frequency range of 470 to 770 MHz, and the other may be configured to scan the frequency range of 770 to 1010 MHz (if frequency conversion and amplification processing has been performed). By controlling in this way, it is possible to reduce the time required for channel setting, as described above.

[0304] 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, it is possible to reduce the time required for channel setting. 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 one at a time (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 (for example, system identification parameters) stored in the TMCC information.

[0305] In an advanced terrestrial digital broadcasting service using dual-polarized transmission, for example, in the case of a channel carrying 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 recorded as a single channel in the service list. 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 caused by the existence of the exact same broadcast program on different channels during tuning processing using a service list.

[0306] In contrast, in an advanced terrestrial digital broadcasting service using dual-polarized transmission, if different broadcast programs are transmitted on layer B of horizontally polarized signals and layer B of vertically polarized signals (when layer B of vertically polarized signals 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 horizontally polarized signals and layer B of vertically polarized signals can be determined by referring to the additional layer transmission identification parameter in the TMCC information in broadcast receiving device 100.

[0307] [Channel selection processing for broadcast receiving devices] 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 or not the desired channel has been selected. An example of processing for each channel selection method is described below.

[0308] <Example of one-touch channel selection processing> (1) By pressing the one-touch key on the remote control, the service with the “service_id” specified by “remote_control_key_id” is selected. (2) Set the last mode and display channel information after selecting a channel.

[0309] <Example of channel up / down selection using the channel up / down buttons> (1) By pressing the channel up / down keys on the remote control, the channel is selected 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 smallest number is selected. (1-2) When the down key is pressed, the adjacent service with the lower three-digit number is selected. However, if the current three-digit number is the smallest number in the service list, the service with the largest number is selected. (2) Set the last mode and display channel information after selecting a channel.

[0310] <Example of direct channel selection processing> (1) When direct channel selection is selected, the system will wait for the user to enter a three-digit number. (2-1) If the input of the three-digit number is not completed within a predetermined time (about 5 seconds), the normal mode is restored and the channel information of the currently selected service is displayed. (2-2) When the input of the three-digit number is completed, it is determined whether the channel exists in the service list of the receivable frequency table, and if not, a message such as "This channel does not exist" is displayed. (3) If the channel exists, the channel selection process is performed, the last mode is set, and the channel information after the channel selection is displayed.

[0311] 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.

[0312] <Remote control for broadcast receiver> FIG. 12A shows an example of an external view of a remote controller used to input operation instructions to the broadcast receiving device 100 according to the embodiment of the present invention.

[0313] 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.

[0314] Remote control 180R also has network switching keys (advanced terrestrial digital, terrestrial digital, advanced BS, BS, CS) 180R5 for switching the broadcast network received by broadcast receiving device 100. Remote control 180R also has one-touch keys (1-12) 180R6 used for one-touch channel selection, channel up / down keys 180R7 used for channel up / down channel 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 serves as one-touch key 180R6, and when directly selecting a channel, a three-digit number can be input by operating one-touch key 180R6 after pressing direct key 180R8.

[0315] The remote control 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.

[0316] 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.

[0317] The remote control 180R also includes a video key 180RE for selecting related video, an audio key 180RF for switching between audio ES and two languages, a subtitle key 180RG for switching subtitles on / off and switching subtitle languages, a volume key 180RH for increasing / decreasing the volume of the audio output, and a mute key 180RI for switching the audio output on / off.

[0318] <Example of network switching using an advanced terrestrial digital key> The remote control 180R of the broadcast receiving device 100 according to an embodiment of the present invention includes a network switching key 180R5 including an "advanced terrestrial digital key," a "terrestrial digital key," an "advanced BS key," a "BS key," and a "CS key." Here, the "advanced terrestrial digital key" and the "terrestrial digital key" may be configured to prioritize channel selection for 4K broadcast programs when the "advanced terrestrial digital key" is pressed, and prioritize channel selection for 2K broadcast programs when the "terrestrial digital key" is pressed, for example, in an advanced terrestrial digital broadcasting service where 4K broadcast programs and 2K broadcast programs are simultaneously broadcast on different hierarchical levels. This control allows, for example, a situation where 4K broadcast programs can be received but there are many errors in the transmission waves of the 4K broadcast programs, in which case pressing the "terrestrial digital key" can force channel selection for the 2K broadcast programs.

[0319] <Example of screen display when selecting a station> As described above, the broadcast receiving device 100 of an embodiment of the present invention has the 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.

[0320] 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. In addition to the information similar to that of banner display 192A1, it may also display a symbol representing "advanced" to indicate that the program being received is a 4K broadcast program. If resolution conversion processing or downmixing processing has been performed, an indication to that effect may also 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.

[0321] By displaying these 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.

[0322] 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.

[0323] Example 2 A second embodiment of the present invention will be described. The second embodiment of the present invention is configured so that the injection level can be changed in the digital broadcasting system according to the first embodiment. Differences from the first embodiment will be described below. The configuration, processing, and operation other than those described below are the same as those of the first embodiment, and therefore will not be described again.

[0324] In the first embodiment, the hierarchical division multiplexing transmission method shown in FIG. 8A was described as an example of a transmission method for realizing 4K broadcasting while maintaining the viewing environment of the current terrestrial digital broadcasting service. As described above, the difference between the modulated wave level of an upper layer and the modulated wave level of a lower layer (difference in transmission power) is called the injection level (IL), and is a value specified by the broadcasting station. As described above, the injection level is generally expressed as a logarithmic relative ratio (dB) of the difference in modulated wave level (difference in power). It is known that the reception range of a lower layer modulated wave varies depending on the modulated wave level and injection level of the upper layer modulated wave, and that reducing the injection level expands the reception range of the lower layer modulated wave. The relationship between the injection level and the modulated wave level will be described in detail later. Note that changing the injection level can also be expressed as changing the difference in transmission power between the upper layer modulated wave and the lower layer modulated wave.

[0325] FIG. 13 shows an example of the reception range of an advanced terrestrial digital broadcasting service using the hierarchical division multiplexing transmission method according to this embodiment. In FIG. 13(1), a transmission wave using the hierarchical division multiplexing method is transmitted from a radio tower 30300, and broadcast receiving devices 30101, 30102, 30103, and 30104, each having the same configuration as the broadcast receiving device 100, are installed. Within the upper hierarchical reception range 30910, the upper hierarchical modulated wave can be received and a broadcast program can be displayed. Similarly, within the lower hierarchical reception range 30900, the lower hierarchical modulated wave can be received and a broadcast program can be displayed. Since the lower hierarchical reception range 30900 is encompassed within the upper hierarchical reception range 30910, the upper hierarchical modulated wave can also be received and a broadcast program can be displayed. If a 2K broadcast program is transmitted on the upper hierarchical layer and a 4K broadcast program is transmitted on the lower hierarchical layer, the broadcast receiving device 30101 can receive the lower hierarchical modulated wave and display the 4K broadcast program. Furthermore, broadcast receiving device 30101 can receive upper hierarchical modulated waves and display 2K broadcast programs. However, broadcast receiving devices 30102 and 30103 can only receive upper hierarchical modulated waves and cannot correctly receive lower hierarchical modulated waves. Therefore, they can only display 2K broadcast programs, not 4K broadcast programs. Furthermore, broadcast receiving device 30104 is outside the reception range of both the upper and lower hierarchical layers, and is therefore unable to receive 2K broadcast programs on the upper hierarchical layers, nor 4K broadcast programs on the lower hierarchical layers.

[0326] Figure 13(2) shows an example of the reception range when the injection level is changed to a lower level. When the injection level is changed to a lower level, lower hierarchical reception range 30900 expands to lower hierarchical reception range 30901 after the change. Therefore, broadcast receiving device 30102 can now receive 4K broadcast programs transmitted using lower hierarchical modulated waves. Meanwhile, the reception status of receiving devices 30101, 30103, and 30104 does not change. In this case, in order for broadcast receiving device 30102 to display 4K broadcast programs, it must perform a rescan, which is a reception setting process, to acquire new control information related to the reception of 4K broadcast programs and store it in the memory of the receiving device, etc.

[0327] FIG. 14 shows an example of a modulated wave in the hierarchical division multiplexing transmission method according to this embodiment.

[0328] 14(1) shows an example of a modulated wave transmitted from a radio tower 30300, in which an upper hierarchical modulated wave 30110 and a lower hierarchical modulated wave 30120 are multiplexed, and the injection level at this time is injection level 30112. The upper hierarchical modulated wave required C / N 30111 and the lower hierarchical modulated wave required C / N 30121 are C / Ns at which the broadcast receiving device 100 can receive and display a broadcast program without error, and are values ​​derived from the modulation parameters of each modulated wave, i.e., the carrier modulation mapping method, error correction method, coding rate, constellation format, etc. In order for the broadcast receiving device 100 to receive and display a broadcast program without error, the injection level 30112 is specified as a value obtained by adding a margin to the upper hierarchical modulated wave required C / N 30111. Also, the lower layer modulated wave C / N 30122 is defined as the difference between the modulated wave level of the lower layer modulated wave 30120 and the noise floor 30000, and has a value greater than the lower layer modulated wave required C / N 30121.

[0329] Figure 14(3) shows an example of a modulated wave received by broadcast receiving device 30101. Broadcast receiving device 30101 is located far from radio tower 30300. Therefore, the modulated wave transmitted from radio tower 30300 is attenuated, resulting in upper-layer modulated wave 30310 and lower-layer modulated wave 30320. Injection level 30112, required C / N for upper-layer modulated wave 30111, and required C / N for lower-layer modulated wave 30121 are the same as those in Figure 14(1). Due to attenuation, the modulated wave level of lower-layer modulated wave 30320 is lower than the modulated wave level of lower-layer modulated wave 30120 in Figure 14(1). Similarly, lower-layer modulated wave C / N 30322 is smaller than lower-layer modulated wave C / N 30122 in Figure 14(2). However, because injection level 30112 is greater than the upper layer modulated wave required C / N 30111, broadcast receiving device 30101 can receive and display 2K broadcast programs transmitted by upper layer modulated wave 30310. Also, because lower layer modulated wave C / N 30322, although attenuated, is still greater than lower layer modulated wave required C / N 30121, broadcast receiving device 30101 can receive and display 4K broadcast programs transmitted by lower layer modulated wave 30320.

[0330] Figure 14(5) shows an example of a modulated wave received by broadcast receiving device 30102. Broadcast receiving device 30102 is located further away from radio tower 30300 than broadcast receiving device 30101. As a result, the modulated wave transmitted from radio tower 30300 is attenuated, resulting in upper-layer modulated wave 30510 and lower-layer modulated wave 30520. Injection level 30112, required C / N for upper-layer modulated wave 30111, and required C / N for lower-layer modulated wave 30121 are the same as in Figure 14(1). Due to attenuation, the modulated wave level of lower-layer modulated wave 30520 is lower than the modulated wave level of lower-layer modulated wave 30320 in Figure 14(3). Similarly, lower-layer modulated wave C / N 30522 is even smaller than lower-layer modulated wave C / N 30322. Here, because injection level 30112 is greater than upper layer modulated wave required C / N 30111, broadcast receiving device 30102 can receive and display 2K broadcast programs transmitted by upper layer modulated wave 30310. However, as a result of the above-mentioned attenuation of the modulated wave level of lower layer modulated wave 30520, lower layer modulated wave C / N 30522 becomes smaller than lower layer modulated wave required C / N 30121. Therefore, broadcast receiving device 30102 cannot receive and display 4K broadcast programs transmitted by lower layer modulated wave 30520.

[0331] Next, Figure 14(2) shows an example of a modulated wave transmitted from a radio tower 30300 when the injection level is changed on the broadcasting station side. When the injection level shown in Figure 14 is changed, the upper layer modulated wave 30210 has the same modulated wave level as the upper layer modulated wave 30110 in Figure 14(1) before the injection level change, but the modulation parameters of the modulated wave are changed so that the required C / N 30211 for the upper layer modulated wave is smaller than the required C / N 30111 for the upper layer modulated wave in Figure 14(1) before the injection level change. In addition, the C / N 30222 for the lower layer modulated wave is set larger than the C / N 30122 for the lower layer modulated wave. Furthermore, the injection level 30212 is set smaller than the injection level 30112.

[0332] Figure 14(4) shows an example of a modulated wave received by broadcast receiving device 30101 when the modulated wave of Figure 14(2) is transmitted. Broadcast receiving device 30101 is located far from radio tower 30300. Therefore, the modulated wave transmitted from radio tower 30300 is attenuated, resulting in upper-layered modulated wave 30410 and lower-layered modulated wave 30420. Here, injection level 30212 is greater than upper-layered modulated wave required C / N 30211, so broadcast receiving device 30101 can receive and display the 2K broadcast program transmitted by upper-layered modulated wave 30410. Furthermore, lower-layered modulated wave C / N 30422, although attenuated, is still greater than lower-layered modulated wave required C / N 30221, so broadcast receiving device 30101 can receive and display the 4K broadcast program transmitted by lower-layered modulated wave 30420.

[0333] Figure 14(6) shows an example of a modulated wave received by broadcast receiving device 30102 when the modulated wave of Figure 14(2) is transmitted. Broadcast receiving device 30102 is located further from radio tower 30300 than broadcast receiving device 30101. Therefore, the modulated wave transmitted from radio tower 30300 is attenuated, resulting in upper hierarchical modulated wave 30610 and lower hierarchical modulated wave 30620. Here, injection level 30212 is greater than upper hierarchical modulated wave required C / N 30211, so broadcast receiving device 30102 can receive and display the 2K broadcast program transmitted by upper hierarchical modulated wave 30610. Furthermore, lower hierarchical modulated wave C / N 30622 is even smaller than lower hierarchical modulated wave C / N 30422 of Figure 14(4). However, in the example of FIG. 14(6), unlike FIG. 14(5) before the injection level change, the lower hierarchical modulated wave C / N 30222 of the modulated wave transmitted from the radio tower 30300 is higher than the lower hierarchical modulated wave C / N 30122 before the injection level change. Therefore, the lower hierarchical modulated wave C / N 30622 remains higher than the lower hierarchical modulated wave required C / N 30221. In other words, as a result of the injection level change, the broadcast receiving device 30102 has transitioned from a state in which it was unable to receive and display 4K broadcast programs transmitted via the lower hierarchical modulated wave 30520 to a state in which it can receive and display 4K broadcast programs transmitted via the lower hierarchical modulated wave 30620. Therefore, the broadcast receiving device 30102 can display 4K broadcast programs by rescanning.

[0334] As explained above with reference to Figures 13 and 14, changing the injection level can expand the installation range of receiving devices that can receive broadcast programs transmitted using lower hierarchical modulation waves. Also, considering mainly receiving devices installed in a given location, changing the injection level can transition from a state in which broadcast programs transmitted using lower hierarchical modulation waves could not be received or displayed to a state in which broadcast programs transmitted using lower hierarchical modulation waves can be received and displayed.

[0335] <Transmission of injection level identification> Next, a technique for more appropriately transitioning the reception state of a broadcast program in a receiving device due to the change in injection level will be described. First, transmission of the injection level identification will be described.

[0336] First, a technique for transmitting parameters such as injection level in an AC signal that transmits additional information related to transmission control of modulated waves will be described.

[0337] Fig. 15 shows a specific example of the transmission parameter additional information. In the first embodiment, Fig. 6H was used to show an example of transmitting parameters of an error correction method and parameters of a constellation format. Fig. 15 of the second embodiment is a specific example of the transmission parameter additional information that is different from Fig. 6H of the first embodiment. In the example of Fig. 15, parameters such as an injection level can be included.

[0338] Next, Figures 16A and 16B show examples of bit allocation for identifying the injection level state. Both Figures 16A and 16B identify which of multiple different injection level states the injection level is in. However, the examples of Figures 16A and 16B show examples in which each injection level state is defined differently.

[0339] First, the example of FIG. 16A will be described. If this parameter is "000," hierarchical division multiplexing transmission is not applied. If this parameter is any of "001" to "111," hierarchical division multiplexing transmission is applied, and the injection level state indicates which of the seven states, from state 1 to state 7, respectively. The injection level itself is expressed in dB. In the example of FIG. 16A, the injection level identification bit is set and transmitted depending on which of the ranges shown in the figure the injection level of the target transmission wave falls within. The broadcast receiving device obtains the injection level state identification bit of FIG. 16A and, based on this, can determine the range in which the injection level of the target transmission wave falls.

[0340] Next, the example of Figure 16B will be described. If this parameter is "000," hierarchical division multiplexing transmission is not applied. If this parameter is any of "001" to "111," hierarchical division multiplexing transmission is applied, and the injection level state indicates one of the first to seventh states. Unlike the example of Figure 16A, the injection levels indicated by the first to seventh states do not indicate a range indicated in dB, but rather indicate a predetermined dB level. In this case, the injection levels of the transmission wave that can be set by the broadcasting station are limited to these multiple options, but the accuracy of the injection level value indicated by the identification bit in Figure 16B is high. The broadcast receiving device acquires the injection level state identification bit and, based on this, can determine the injection level value of the target transmission wave.

[0341] Note that in both the examples of Figures 16A and 16B, the meaning of the injection level state from the first state to the seventh state does not necessarily mean that the first state transitions one state at a time. For example, when a new digital broadcast service for a 4K broadcast program is started using a lower hierarchical modulation wave, the injection level state does not necessarily have to start from the first state; for example, it may start from the second state. Furthermore, the injection level state may be changed one state at a time, or it may be changed from the first state to the third state or the fifth state, etc. These settings may be determined according to the broadcasting station's policy. However, changes that increase the injection level, such as changing from the fifth state to the fourth state, should be avoided. This is because such a change narrows the reception range of 4K broadcast programs transmitted using a lower hierarchical modulation wave and may cause inconvenience to users. In other words, the injection level states from the first state to the seventh state shown in the examples of Figures 16A and 16B can be said to be states that transition irreversibly in the digital broadcasting system.

[0342] 16A and 16B, the injection level is expressed with a resolution of about seven states, taking bit efficiency into consideration. Alternatively, as another variation of the discrimination bits for the injection level states, the number of discrimination bits may be increased, and the injection level may be expressed directly as a value in dB that indicates the difference in modulated wave level. In this case, the number of options for the injection level of the transmission wave that can be set by the broadcasting station increases, and the precision of the injection level value that can be grasped by the broadcast receiving device increases.

[0343] As yet another modification of the injection level state identification bit, a method may be used in which the modulated wave level difference is calculated using a predefined calculation formula in which the value of the transmitted bit is used as a variable.

[0344] Furthermore, an identification bit for the injection level state may be included in the TMCC information and transmitted.

[0345] By using the above-described injection level state identification bit, a change in injection level can be suitably communicated from the broadcast station side to the broadcast receiving device side.

[0346] <Rescan> The broadcast receiving device 100 according to the second embodiment of the present invention has a new rescanning function to suitably deal with changes in the injection level, as will be described below.

[0347] In the following description, the term "injection level" may be read as "injection level state." The reason for this is as follows. As already explained in the description of the injection level state identification bit in FIG. 16, in the broadcast receiving device 100, there are cases where the injection level value can be identified as is, and cases where the state can be identified within a certain range of values. In the latter case, even if the injection level is changed within a certain range, the state of the injection level is determined to be "unchanged." Therefore, in the broadcast receiving device 100, when the injection level value can be identified as is, in the following description, the term "change in injection level" can be considered as it is. Furthermore, in the broadcast receiving device 100, when a change in the injection level is identified in "state" units with a certain range, in the following description, the term "injection level" will be read as "injection level state."

[0348] 17 shows an example of a rescanning operation sequence of the broadcast receiving device 100 according to the second 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.

[0349] First, as a prerequisite process, when creating a service list in the initial scan process, the AC information of this embodiment is acquired by the tuner / demodulator, and the injection level included in the AC information is stored for each channel in the nonvolatile memory of the ROM 103 or in the various information storage area 1019 of the storage unit 110. Note that if the injection level is transmitted using TMCC, the AC information can be read as TMCC information.

[0350] The broadcast receiving device 100 acquires AC information in the tuner / demodulator (S30001). Next, the injection level stored in the nonvolatile memory of the ROM 103 or the various information storage area 1019 (the injection level stored during the initial scan or the most recent rescan) is compared with the injection level included in the acquired AC information to detect whether there has been a change and determine whether a rescan is necessary (S30002). If the injection levels are the same, the injection level has not been changed, and the process ends. If a small change in the injection level is detected, this means that the lower hierarchical layer reception range has expanded. In this case, there is a possibility that the device has transitioned to a state where it is possible to receive broadcast programs transmitted using lower hierarchical modulated waves, so it is determined that a rescan is necessary and the process proceeds to S30003.

[0351] In the process of S30003, it is checked whether a 4K broadcast service list already exists for the received channel. If it exists, this indicates that the broadcast receiving device 100 has been able to receive lower-layer modulated waves even before the expansion of the lower-layer reception range, and rescanning is unnecessary, so the process ends. If a 4K broadcast service list does not exist, the broadcast receiving device 100 may be newly included in the lower-layer reception range, so the process proceeds to S30004. Note that the order of the processes of S30002 and S30003 may be reversed. Note that the branching determination process of the process of S30003 has the effect of omitting a new rescan when a 4K broadcast service list already exists, thereby reducing the frequency of rescans based on changes in the injection level. However, without using the process of S30003, it is also possible to configure the system to perform a rescan every time the injection level is changed, even if a 4K broadcast service list already exists. In this case, the current 4K broadcast reception status can be more accurately reflected in the service list.

[0352] Next, in the process of S30004, the system waits until a state in which rescanning is possible is reached. Specifically, for the third tuner / demodulator 130L, if the tuner / demodulator is operating while the user is watching or recording, rescanning is not performed. If the tuner / demodulator is not operating, for example, transitioning to a standby state, the system proceeds to the process of S30005. Note that if the broadcast receiving device 100 has multiple third tuner / demodulators 130L, even if one tuner / demodulator is operating because the user is watching or recording, if the other tuner / demodulators are not operating and are in a standby state, rescanning can be performed using the tuner / demodulator in the standby state. Next, in the process of S30005, the third tuner / demodulator 130L is used to scan for 4K broadcast services transmitted using lower hierarchical modulated waves. Note that the time to perform the scan may be predetermined by the broadcast receiving device 100, or the user may be able to set the scan time.

[0353] Next, it is checked whether a new 4K broadcast service list has been added as a result of the scan (whether a new 4K broadcast service has been added) (S30006). If a service list has not been added (if a new 4K broadcast service has not been added), the broadcast receiving device 100 is not included in the new reception range even after the lower layer reception range has been expanded by changing the injection level. Therefore, the processing ends. If a service list has been added, the service list added as a result of rescanning is presented to the user (S30007). If a service list has been added by performing a scan while in standby mode, when the user switches the device on, a message that 4K broadcast service reception is now possible may be displayed first, and the added service list may also be displayed. Note that if a 4K broadcast service list can be created, 4K broadcast reception is possible, so the processing of S30007 is not necessarily required.

[0354] According to the example described using FIG. 17 , the broadcast receiving device 100 can detect a change in the injection level and use this as a trigger to start a rescan. This allows for a more optimal start of a rescan. Note that the "rescan start" in the expression "trigger to start a rescan" may refer to the start of a rescan by the processing of S30005, or may refer to the start of waiting until a state in which rescanning is possible by the processing of S30004. This is the same in all of the variations of the "trigger to start a rescan" described below. Furthermore, in both the example of FIG. 17 and other examples described below, the situation in which a "trigger to start a rescan" occurs means that the broadcast receiving device 100 recognizes or identifies that a "rescan" is necessary. Therefore, in both the example of FIG. 17 and other examples described below, when a "trigger to start a rescan" occurs, the broadcast receiving device 100 recognizes or identifies that a "rescan" is necessary.

[0355] <Rescan due to detection of change in upper layer modulation parameters> In the description of FIG. 17 above, a change in the injection level is detected in step S30002, and this is used as a trigger to start a rescan. In another variation, the rescan may be triggered not by the detection of a change in the injection level, but by the detection of a change in the modulation parameters of the upper hierarchical modulated wave. This is because, when the injection level is changed, the required C / N of the upper hierarchical modulated wave must also be changed. For example, in the examples of FIGS. 14(1) and 14(2), the required C / N of the upper hierarchical modulated wave is changed from 30111 to 30211 in order to change the injection level from injection level 30112 to level 30212. When the detection of a change in the modulation parameters of the upper hierarchical modulated wave is used as a trigger to start a rescan, the modulation parameters of the upper hierarchical modulated wave are obtained from the TMCC information and / or AC information during the initial scan or rescan and stored in the nonvolatile memory of the ROM 103 or the various information storage area 1019 of the storage unit 110. Thereafter, the modulation parameters of the upper hierarchical modulated wave newly acquired from the newly received TMCC information and / or AC information are compared with the modulation parameters of the upper hierarchical modulated wave stored in the nonvolatile memory of ROM 103 or the various information storage area 1019 of the storage unit 110 to detect whether there has been a change. If the result of this detection process shows that there has been a change in the modulation parameters of the upper hierarchical modulated wave, rescanning can be started.

[0356] As described above, the broadcast receiving device 100 can detect a change in the modulation parameters of the upper hierarchical modulated wave and use this as a trigger to start a rescan, thereby enabling a more appropriate start of a rescan.

[0357] <Rescan due to detection of increased modulation level> 17, a change in the injection level is detected in process S30002, which triggers rescanning. In contrast, as another variation of the "trigger for starting rescanning," the need for rescanning may be determined by detecting an increase in the level of modulated waves received by broadcast receiving device 100. The modulated waves received by broadcast receiving device 100 increase when the output level of modulated waves transmitted from radio tower 30300 is increased. Alternatively, the level may increase even when the transmission environment between radio tower 30300 and broadcast receiving device 100 improves.

[0358] Figure 18 shows an example of a modulated wave before and after an increase in modulated wave level. Figure 18(1) shows the same modulated wave as Figure 14(1). Figure 18(2) shows a modulated wave obtained when only the modulated wave level is increased without changing the modulation parameters or injection level. The modulated wave level of the upper hierarchical modulated wave 30110 increases, becoming the upper hierarchical modulated wave 30710. The modulated wave level of the lower hierarchical modulated wave 30120 increases, becoming the lower hierarchical modulated wave 30720. The lower hierarchical modulated wave C / N 30122 also increases, becoming the lower hierarchical modulated wave C / N 30722. Meanwhile, the upper hierarchical modulated wave required C / N 30111 and the lower hierarchical modulated wave required C / N 30121 do not change. In principle, the injection level 30112, which indicates the difference in signal level as a relative ratio (dB), also does not change.

[0359] Figure 18(3) shows the modulated wave received by the broadcast receiving device 30102, and this modulated wave is the same as Figure 14(5). As mentioned above, in the state of Figure 14(5), the lower hierarchical modulated wave C / N 30522 is smaller than the lower hierarchical modulated wave required C / N 30121, and the broadcast receiving device 30102 cannot receive or display the 4K broadcast program transmitted by the lower hierarchical modulated wave 30520.

[0360] Figure 18(4) shows the modulated wave received by the broadcast receiving device 30102 when transmitting the modulated wave of Figure 18(2) with an increased modulated wave level. The upper layer modulated wave 30810 and the lower layer modulated wave 30820 have higher modulated wave levels than the upper layer modulated wave 30510 and the lower layer modulated wave 30520 in Figure 18(3), respectively. In addition, the injection level 30112 generally does not change, but the lower layer modulated wave C / N 30822 is higher than the lower layer modulated wave C / N 30522 in Figure 18(3). In the example of Figure 18(4), the lower layer modulated wave C / N 30822 is higher than the required lower layer modulated wave C / N 30121. That is, the example in Figure 18(4) shows that the broadcast receiving device 30102 has transitioned from a state in which it was unable to receive and display a 4K broadcast program transmitted by the lower hierarchical modulated wave 30520 to a state in which it is able to receive and display a 4K broadcast program transmitted by the lower hierarchical modulated wave 30820. In this state, the broadcast receiving device 30102 can newly display the 4K broadcast program by performing a rescan. Therefore, it is sufficient to detect this state transition and use it as a trigger to start a rescan.

[0361] Specifically, instead of detecting a change in the injection level in step S30002 of Fig. 17, it is sufficient to detect that the lower hierarchical modulated wave C / N 30822 has become larger than the lower hierarchical modulated wave required C / N 30121, and use this as a trigger to start a rescan. To perform this detection, the broadcast receiving device 100 needs to know both the lower hierarchical modulated wave C / N 30822 and the lower hierarchical modulated wave required C / N 30121.

[0362] First, because the lower layer modulated wave C / N 30822 cannot be detected directly, the lower layer modulated wave C / N 30822 is calculated using other detectable values. An example of a method for calculating the lower layer modulated wave C / N 30822 is described below. First, the upper layer modulated wave C / N 30832 is detected in the third tuner / demodulator 130L. The upper layer modulated wave C / N 30832 is the difference between the modulated wave level of the upper layer modulated wave 30810 and the noise floor 30000, and is therefore equal to the sum of the injection level 30112 and the lower layer modulated wave C / N 30822. Therefore, the lower layer modulated wave C / N 30822 can be calculated by subtracting the injection level 30112 from the detected upper layer modulated wave C / N 30832.

[0363] Next, the required C / N 30121 for the lower hierarchical modulated wave cannot be directly obtained. Therefore, for example, the required C / N 30121 for the lower hierarchical modulated wave necessary for transmitting a 4K broadcast program can be estimated in advance and stored in the non-volatile memory of the ROM 103 in the broadcast receiving device 100 or in the various information storage area 1019.

[0364] As another example of acquiring the required C / N 30121 for a lower layer modulated wave, the required C / N 30121 for a lower layer modulated wave may be transmitted using a TMCC signal, AC signal, or free space in a packet stream of a higher layer modulated wave, and the broadcast receiving device 100 may acquire this value. In this case, the required C / N 30121 for a lower layer modulated wave may not be transmitted directly, but modulation parameters for the lower layer modulated wave may be transmitted, and the required C / N 30121 for a lower layer modulated wave may be derived based on the modulation parameters acquired by the broadcast receiving device 100. In this case, the broadcast receiving device 100 may derive the required C / N 30121 for a lower layer modulated wave using a pre-installed arithmetic expression or lookup table and the acquired modulation parameters.

[0365] Then, the required C / N 30121 for the lower hierarchical modulated wave obtained in this manner or stored in advance in the non-volatile memory of ROM 103 or the various information storage area 1019 is compared with the C / N 30822 for the lower hierarchical modulated wave calculated in the above-mentioned calculation process, and it is detected that the C / N 30822 for the lower hierarchical modulated wave has become larger than the C / N 30121 for the lower hierarchical modulated wave.

[0366] 18, broadcast receiving device 100 can detect an increase in the level of the modulated wave received and use this as a trigger to start rescanning. This makes it possible to start rescanning more appropriately.

[0367] <Rescan when 4K broadcast is detected> 17, regardless of whether the injection level has been changed, if the 4K service list does not exist, the third tuner / demodulator 130L may intermittently repeatedly receive a lower hierarchical modulated wave, and determine whether rescanning is necessary based on whether the lower hierarchical modulated wave can be received. If reception of a lower hierarchical modulated wave is confirmed, it is determined that the broadcast receiving device 100 has newly fallen within the receivable range, and the process proceeds to step S30004, waiting until a state in which rescanning is possible is reached. The intermittently repeated reception process of a lower hierarchical modulated wave may be performed periodically, such as every other day, or may be performed under aperiodic conditions.

[0368] <Rescan based on modification date or modification time information> As another variation of the determination method in process S30002 of FIG. 17, the broadcast receiving device 100 may acquire the injection level change date (or the injection level change time including the injection level change date) and perform a rescan when the injection level change date (or the injection level change time) is reached. This is also another variation of the "trigger to start a rescan." First, the injection level change date is stored in the TMCC information and / or AC information and transmitted. For example, the injection level change date information (or the injection level change time information including the injection level change date information) may be transmitted using the undefined area of ​​the transmission parameter additional information shown in FIG. 15. The transmitted information is acquired by the third tuner / demodulation unit 130L of the broadcast receiving device 100. The broadcast receiving device 100 may determine that a rescan is necessary when the current date (or the current time) managed by current time information or the like reaches the injection level change date (or the injection level change time). If it is determined by this process that rescanning is necessary, the process S30004 can be started.

[0369] As described above, by comparing the injection level change date acquired by the broadcast receiving device 100 with the current date, it is possible to use the fact that the current date has reached the injection level change date as a trigger for starting a rescan. Alternatively, by comparing the injection level change time acquired by the broadcast receiving device 100 with the current time, it is possible to use the fact that the current time has reached the injection level change time as a trigger for starting a rescan. This makes it possible to start a rescan more appropriately.

[0370] The broadcast receiving device 100 may obtain the current date and time from the MH-TOT or the like transmitted by the broadcast wave.

[0371] In this way, the injection level change date or time can be used as a trigger for starting a rescan, which allows the broadcast receiving device 100 to know the injection level change date or time in advance, making it possible to start a rescan more appropriately.

[0372] <Display a prompt to the user asking if they want to start a rescan> As a variation of process S30004 in Figure 17, it is also possible to change the process to notify the user immediately of the need for rescanning, rather than waiting for a rescanning possible state. Specifically, instead of entering a standby state in process S30004, a display explaining the possibility of receiving 4K broadcast programs and the need for rescanning is displayed. This may be configured to allow the user to select whether or not to start rescanning. If the user selects to start rescanning, the rescanning process begins immediately, and if not, the process simply returns to the rescanning possible state standby process S30004.

[0373] In this way, the user's selection in response to the inquiry about whether to start a rescan presented to the user can be used as a trigger to start a rescan, which makes it possible to start a rescan more conveniently, reflecting the user's convenience.

[0374] Example 3 <Frequency interleaving in broadcast station systems> A third embodiment of the present invention will be described. The third embodiment of the present invention is configured so that the operational settings of frequency interleaving and deinterleaving can be changed in the digital broadcasting system according to the first embodiment. Differences from the first embodiment will be described below. Other configurations, processes, and operations other than those described below are the same as those of the first embodiment, and therefore will not be described again.

[0375] The frequency interleaving configuration included in the transmission path coding unit 416 in FIG. 4D is shown in FIG. 19A. In segment division, data segment numbers 0 to 12 are assigned to the partial receiving unit, the segment type 1 modulation unit, and the segment type 2 modulation unit, in that order. Note that the segment type 1 modulation unit, which was a differential modulation unit dedicated to differential modulation (segments with carrier modulation specified as DQPSK) in conventional frequency interleaving configurations, has been expanded in this embodiment to support differential modulation and synchronous modulation. Note that the segment type 2 modulation unit is a synchronous modulation unit dedicated to synchronous modulation (segments with carrier modulation specified as QPSK, 16QAM, and 64QAM, or 256QAM, 1024QAM, and 4096QAM). The partial modulation unit performs intra-segment carrier rotation and intra-segment carrier randomization, i.e., intra-segment interleaving. The segment type 1 modulation unit and the segment type 2 modulation unit perform inter-segment interleaving and intra-segment interleaving, respectively.

[0376] Regarding the relationship between the hierarchical structure and data segments, data segments in each layer are arranged consecutively in numerical order, with the layers containing the smallest data segment numbers being layer A, layer B, and layer C. Furthermore, in a conventional frequency interleaving configuration, data segments belonging to the same type of modulation unit are interleaved between segments, even if they are in different layers. Typically, layers B and C transmit broadcast programs with a resolution of 2K or higher, so synchronous modulation with a large transmission capacity is used. Therefore, in a conventional frequency interleaving configuration, both layers B and C are processed by the synchronous modulation unit, resulting in interleaving between segments in a mixed state of layers B and C.

[0377] Figure 20(1) shows an example of hierarchical transmission. Layer A is assumed to be partially received data, layer B to be synchronously modulated data using five segments, and layer C to be synchronously modulated data using seven segments. In this case, layer A is only intra-segment interleaving performed in the single segment (segment number 0), while layers B and C are assumed to be 12 segments (segment numbers 1 to 12), generating a signal with a transmission spectrum in which both inter-segment and intra-segment interleaving are performed. This transmission spectrum corresponds to the horizontal polarization in the 13-segment allocation example in the dual-polarization transmission system shown in Figure 7A(2). Meanwhile, Figure 20(3) shows an example of hierarchical transmission for the vertical polarization shown in Figure 7A(2). In the example shown in Figure 7A(2), the vertical polarization is composed only of layer B, which uses five segments, resulting in a signal with a transmission spectrum in which layer B carriers are interleaved across the 12 segments (segment numbers 1 to 12).

[0378] From the transmission spectra shown in Figures 20(1) and 20(3), we can see that the vertically polarized layer B uses the same segment and frequency as the horizontally polarized layers B and C. For this reason, when conventional frequency interleaving is applied, there is the issue of interference occurring between the horizontally polarized and vertically polarized waves. In particular, current terrestrial digital broadcasting receivers only receive layer C of 2K broadcasts transmitted with horizontal polarization, but do not take into account interference from vertical polarization, which degrades the reception performance of layer C.

[0379] Therefore, in an embodiment of the present invention, even if layers B and C are synchronously modulated, inter-segment interleaving between layers B and C is not performed, and interleaving is performed only within the layers. That is, in the frequency interleaving shown in Figure 19A, when layers B and C are both synchronously modulated, layer B performs synchronous modulation using a modulation unit with segment format 1, and layer C performs synchronous modulation using a modulation unit with segment format 2 that is different from the modulation unit with segment format 1. Inter-segment interleaving is performed independently by the modulation unit with segment format 1 and the modulation unit with segment format 2. In this way, inter-segment interleaving where layers B and C are mixed is not performed.

[0380] Figure 20(2) shows an image of hierarchical transmission when the same data as in Figure 20(1) is processed with layer B modulated (synchronously modulated) in the modulation section of segment format 1 and layer C modulated (synchronously modulated) in the modulation section of segment format 2. The modulation section of segment format 1 and the modulation section of segment format 2 each perform inter-segment interleaving independently, resulting in a transmission spectrum in which layer B is assigned to segment numbers 1 to 5 and layer C is assigned to segment numbers 6 to 12. This transmission spectrum corresponds to the horizontal polarization in the example of 13-segment allocation in the dual-polarization transmission system shown in Figure 7A(2). Meanwhile, Figure 20(4) shows an image of hierarchical transmission when similar processing is performed on the vertical polarization shown in Figure 7A(2). The vertical polarization becomes a signal with a transmission spectrum in which layer B is assigned to five segments, segment numbers 1 to 5.

[0381] In this way, in the frequency interleaving according to this embodiment, by using different frequency interleaving processors for layers B and C, layers B and C are transmitted using completely different frequency bands. Therefore, layer C, which is transmitted with horizontal polarization, is not subject to interference from vertical polarization, and the reception performance of layer C is not degraded in current terrestrial digital broadcasting receivers that receive only layer C of 2K broadcasts transmitted with horizontal polarization.

[0382] In this embodiment of the present invention, to achieve the above operation, in the transmission path coding unit 416 shown in Fig. 4D, the frequency interleaving unit processes layer B as modulation (synchronous modulation) in a modulation unit of segment format 1, and layer C as modulation (synchronous modulation) in a modulation unit of segment format 2. In addition, in the mapping unit, layers B and C are each processed as synchronous modulation. Furthermore, to achieve this processing, in this embodiment, the definition of the segment format identification value of bit allocation B17-B19 included in the TMCC information shown in Fig. 5A is expanded as shown in Fig. 5L. Different values ​​are then assigned to layers B and C.

[0383] In the definition of the segment format identification values ​​for B17-B19 in Figure 5L, "111" indicates segment format 1, which means synchronous modulation in broadcasting including advanced terrestrial digital broadcasting services (4K broadcasting) using a dual-polarized transmission method, and differential modulation in other broadcasting such as current 2K broadcasting. "000" indicates segment format 2, which means synchronous modulation in broadcasting including advanced terrestrial digital broadcasting services (4K broadcasting) using a dual-polarized transmission method, and also means synchronous modulation in other broadcasting such as current 2K broadcasting. With this configuration, when transmitting using both horizontally and vertically polarized waves in layer B using a dual-polarized transmission method as shown in Figure 7A(2), "111" indicating segment format 1 is set in the segment format identification for bit allocation B17-B19 shown in Figure 5L.

[0384] As a result, a receiver compatible with advanced terrestrial digital broadcasting services (4K broadcasting) using a dual-polarized transmission method can determine that segment format identification "111" means segment format 1 in broadcasting that includes advanced terrestrial digital broadcasting services (4K broadcasting), and that the modulation method is synchronous modulation. Furthermore, current dedicated receivers for terrestrial digital broadcasting services (2K broadcasting) and current dedicated receivers for terrestrial digital broadcasting services (2K broadcasting) determine segment format identification for bit allocation B17-B19 according to Figure 5A, and therefore determine that "111" is differential modulation. Therefore, this does not affect conventional equipment or receivers that operate using conventional methods.

[0385] On the other hand, layer C, which transmits only using horizontal polarization, sets "000" to indicate segment format 2. As a result, a receiver compatible with advanced terrestrial digital broadcasting services (4K broadcasting) using a dual-polarization transmission method can determine that segment format identification "000" means segment format 2 for broadcasting including advanced terrestrial digital broadcasting services (4K broadcasting), and that the modulation method is synchronous modulation. Furthermore, current dedicated receivers for terrestrial digital broadcasting services (2K broadcasting) and current dedicated receivers for terrestrial digital broadcasting services (2K broadcasting) determine the segment format identification of bit allocation B17-B19 according to Figure 5A, and therefore determine that "000" indicates synchronous modulation. In this way, current dedicated receivers for terrestrial digital broadcasting services (2K broadcasting) and current dedicated receivers for terrestrial digital broadcasting services (2K broadcasting) also determine that segment format identification "000" indicates synchronous modulation for bit allocation B17-B19. Therefore, this does not affect conventional equipment or receivers operating under conventional methods.

[0386] <Frequency deinterleaving in the receiver> Next, the operation of a broadcast receiving device for receiving a transmission signal according to an embodiment of the present invention will be described. Fig. 21A is a block diagram showing the detailed configuration of the demodulation unit 133C and the layer processing / energy despreading / error correction decoding / stream reproduction unit 134C shown in Fig. 2B, which are dedicated receivers for the current terrestrial digital broadcasting service (2K broadcasting), and has the function of receiving the current 2K broadcast program transmitted by horizontal polarization.

[0387] The demodulation unit 133C performs quadrature demodulation on the signal input from the tuning / detection unit 131C, and recovers OFMD symbol synchronization and FFT sample frequency through synchronous recovery. An FFT is performed on the valid period of the OFMD symbol, and a frame synchronization signal is extracted. Depending on the TMCC information extracted by the TMCC decoding unit 132C, differential demodulation or synchronous demodulation is performed in the carrier demodulation unit. Then, depending on the TMCC information, frequency deinterleaving and time deinterleaving are performed, and demapping is performed to extract bit information.

[0388] Next, in the layer processing / energy despreading / error correction decoding / stream reproduction unit 134C, when layered transmission is performed, the signal is divided into layers, and bit deinterleaving and depuncturing are performed for each layer. After combining the layers, Viterbi decoding is performed, and the signal is again divided into layers, and byte deinterleaving and energy despreading are performed for each layer. After reproduction of the transport stream, Reed-Solomon decoding is performed and a packet stream is output.

[0389] Figure 19C shows a detailed configuration of the frequency deinterleaving unit 30030 of the demodulation unit 133C. Since frequency deinterleaving is the inverse process of the frequency interleaving shown in Figure 19A, the segments after carrier demodulation are processed separately in a partial reception unit, differential modulation unit, and synchronous modulation unit. The partial modulation unit performs intra-segment carrier derandomization and intra-segment carrier rotation, i.e., intra-segment deinterleaving. The differential modulation unit and synchronous modulation unit perform intra-segment deinterleaving and inter-segment deinterleaving, respectively.

[0390] In FIG. 19C, the processing to be performed by the frequency deinterleaving unit 30030 is selected according to the partial reception flag and segment type identification included in the TMCC information. Specifically, if the partial reception flag in bit allocation B27 shown in FIG. 5B is set to "1," meaning "partial reception of central segments in the transmission band," the carrier of segment 0 undergoes processing in the partial modulation unit. In FIG. 19C, the receiver dedicated to the current terrestrial digital broadcasting service (2K broadcasting) is included in demodulation unit 133C, which receives only current terrestrial digital broadcasting, so segments 1 to 12 are determined according to the segment type identification in bit allocation B17-B19 shown in FIG. 5A. That is, if the segment type identification in bit allocation B17-B19 is set to "111," it is determined to be differential modulation, and processing in the differential modulation unit is performed. If the segment type identification in bit allocation B17-B19 is set to "000," it is determined to be synchronous modulation, and processing in the synchronous modulation unit is performed.

[0391] As already explained, in the transmission coding unit of the advanced terrestrial digital broadcasting service (4K broadcasting) using the dual-polarized transmission method according to the embodiment of the present invention, as TMCC information, "111" indicating segment format 1 and synchronous modulation is set in the segment format identification of bit allocation...

Claims

[Claim 1] A method for generating a transmission wave including a first broadcast service, in which a first broadcast service and a second broadcast service are transmitted together, comprising: In a transmission wave including the first broadcast service, the first broadcast service and the second broadcast service are stored in different layers each composed of a combination of different segments among a plurality of frequency segments obtained by dividing a predetermined frequency band of the transmission wave including the first broadcast service into a plurality of segments, and are transmitted; a setting step of setting 3-bit identification information capable of identifying whether a modulation method is synchronous modulation for each of a first layer in which the first broadcast service is stored and a second layer in which the second broadcast service is stored in TMCC information included in a transmission wave including the first broadcast service, In the setting step, in generating a transmission wave including the first broadcast service, even if the modulation methods of both the first layer in which the first broadcast service is stored and the second layer in which the second broadcast service is stored are synchronous modulation, the 3-bit identification information to be set in the first layer in which the first broadcast service is stored and the 3-bit identification information to be set in the second layer in which the second broadcast service is stored are set to different values; in generating a transmission wave including the first broadcast service, the 3-bit identification information to be set in the first layer in which the first broadcast service, whose modulation method is synchronous modulation, is stored is always set to 111; and in generating a transmission wave including the first broadcast service, the 3-bit identification information to be set in the second layer in which the second broadcast service, whose modulation method is synchronous modulation, is stored is always set to 000; In generating the transmission wave, data of a broadcasting service whose modulation method is synchronous modulation and whose 3-bit identification information is set to 111 in the setting step and data of a service whose modulation method is synchronous modulation and whose 3-bit identification information is set to 000 in the setting step are subjected to inter-segment interleaving processing in different inter-segment interleaving processing units, a compression technique used in the first broadcast service that is more efficient than a compression technique used in the second broadcast service; How the transmission wave is generated.

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