Broadcast receiving equipment

Abstract

To provide a technique of transmitting or receiving an advanced digital broadcasting service more suitably.SOLUTION: A broadcast receiving device that manages a time using an NTP included in a broadcast wave transmitted from a broadcast transmission system includes a receiving unit that receives the broadcast wave, a first NTP system clock that synchronizes video and audio presentations, and a second NTP system clock that synchronizes the display of subtitles. The receiving unit is configured to receive a first descriptor indicating a type of leap second adjustment processing for a time used to present video and audio, and a second descriptor indicating a type of leap second adjustment processing for a time used to display subtitles, and when a value of the first descriptor and a value of the second descriptor indicate different values, to perform the leap second adjustment processing indicated by the value of the second descriptor instead of the leap second adjustment processing indicated by the value of the first descriptor with respect to a leap second adjustment in the first NTP system clock.SELECTED DRAWING: Figure 18B

Description

[Technical field]

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

[0002] Digital broadcasting services have been available in many countries since the late 1990s, replacing traditional analog broadcasting services. Digital broadcasting services have achieved improvements in broadcast quality using error correction technology, multi-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, advanced digital broadcasting systems have been under study in many countries with the aim of further improving frequency usage efficiency, achieving higher resolution and more advanced functionality. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-14420 A Summary of the Invention [Problem to be solved by the invention]

[0005] It has been over 10 years since the current digital broadcasting service started, and broadcast receiving devices capable of receiving the current digital broadcasting service are widely available. Therefore, when starting the advanced digital broadcasting service that is currently under consideration, it is necessary to consider compatibility with the current digital broadcasting service. In other words, it is preferable to realize UHD (Ultra High Definition) video signals while maintaining the viewing environment of 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 the current digital broadcasting and does not take into consideration the maintenance of the viewing environment for the current digital broadcasting service.

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

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

[0009] As an example, a broadcast receiving device that manages time using NTP contained in broadcast waves transmitted from a broadcast transmission system includes a receiving unit that receives the broadcast waves, a first NTP system clock for synchronizing the presentation of video and audio, and a second NTP system clock for synchronizing the display of subtitles, and is configured so that the receiving unit receives a first descriptor indicating a type of leap second adjustment processing for the time used to present video and audio, and a second descriptor indicating a type of leap second adjustment processing for the time used to display subtitles, and when the value of the first descriptor and the value of the second descriptor indicate different values, the leap second adjustment in the first NTP system clock is performed according to the leap second adjustment processing indicated by the value of the second descriptor, rather than the leap second adjustment processing indicated by the value of the first descriptor. Effect 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 description 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] 2 is a detailed block diagram of a second tuner / demodulation unit of a broadcast receiving device according to an embodiment of the present invention. FIG. [Figure 2D] 2 is a detailed block diagram of a third tuner / demodulation unit of a broadcast receiving device according to an embodiment of the present invention. FIG. [Figure 2E] 4 is a detailed block diagram of a fourth tuner / demodulator unit of a broadcast receiving device according to an embodiment of the present invention. FIG. [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 section of a broadcast receiving device according to one 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. [Figure 3A] 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 in one embodiment of the present invention. FIG. [Figure 4B] 1 is a diagram illustrating hierarchical allocation in hierarchical transmission related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 4C] 1 is a diagram for explaining a generation process of an OFDM transmission wave related to digital broadcasting in one embodiment of the present invention. FIG. [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] 1 is a diagram illustrating segment parameters of an OFDM system related to digital broadcasting according to an embodiment of the present invention. FIG. [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] 1 is a diagram illustrating the arrangement of pilot signals in a synchronous modulation segment related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 4H] 1 is a diagram illustrating the arrangement of pilot signals in a differential modulation segment related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 5A] 1 is a diagram illustrating bit allocation of TMCC carriers related to digital broadcasting in one 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. [Figure 5C] 1 is a diagram illustrating transmission parameter information of TMCC information related to digital broadcasting according to an embodiment of the present invention. FIG. [Figure 5D] 1 is a diagram illustrating system identification of TMCC information related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 5E] 1 is a diagram illustrating a carrier modulation mapping method for TMCC information related to digital broadcasting in one embodiment of the present invention. [Figure 5F] FIG. 2 is a diagram for explaining frequency conversion processing identification of TMCC information related to digital broadcasting according to 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 in TMCC information related to digital broadcasting in an embodiment of the present invention. FIG. [Figure 5I] 1 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] 11 is a diagram illustrating additional layer transmission identification of TMCC information related to digital broadcasting in one embodiment of the present invention. FIG. [Figure 5K] 1 is a diagram for explaining 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 6A] FIG. 2 is a diagram illustrating bit allocation of an AC signal related to digital broadcasting in an embodiment of the present invention. [Figure 6B] FIG. 2 is a diagram for explaining the configuration identification of an AC signal related to digital broadcasting in one embodiment of the present invention. [Figure 6C] FIG. 2 is a diagram illustrating earthquake motion warning information of an AC signal related to digital broadcasting according to an embodiment of the present invention. [Figure 6D] FIG. 2 is a diagram for explaining signal identification of earthquake motion warning information of an AC signal related to digital broadcasting in one embodiment of the present invention. [Figure 6E] 4 is a diagram for explaining earthquake motion warning detail information of earthquake motion warning information of an AC signal related to digital broadcasting according to an embodiment of the present invention. FIG. [Figure 6F] 4 is a diagram for explaining earthquake motion warning detail information of earthquake motion warning information of an AC signal related to digital broadcasting according to an embodiment of the present invention. FIG. [Figure 6G] 10A and 10B are diagrams for explaining 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 information of transmission parameters 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 an AC signal 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] FIG. 4 is a diagram 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 one embodiment of the present invention. [Figure 7F] FIG. 2 is a diagram illustrating a pass-through transmission band according to one embodiment of the present invention. [Figure 7G]1 is a diagram illustrating the configuration of a pass-through transmission method according to one embodiment of the present invention. [Figure 7H] FIG. 2 is a diagram illustrating a pass-through transmission band according to one embodiment of the present invention. [Figure 7I] FIG. 2 is a diagram illustrating a pass-through transmission band according to one embodiment of the present invention. [Figure 8A] 1 is a diagram illustrating a hierarchical division multiplexing transmission method according to one embodiment of the present invention. [Figure 8B] 1 is a system configuration diagram of a broadcasting system using a hierarchical division multiplexing transmission method according to one embodiment of the present invention. [Figure 8C] 5A to 5C 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 explaining the names and functions of tables used in MPEG-2 TS. [Figure 9C] FIG. 1 is a diagram explaining the names and functions of tables used in MPEG-2 TS. [Figure 9D] 1 is a diagram explaining the names and functions of descriptors used in MPEG-2 TS. [Figure 9E] 1 is a diagram explaining the names and functions of descriptors used in MPEG-2 TS. [Figure 9F] 1 is a diagram explaining the names and functions of descriptors used in MPEG-2 TS. [Figure 9G] 1 is a diagram explaining the names and functions of descriptors used in MPEG-2 TS. [Figure 9H] 1 is a diagram explaining the names and functions of descriptors used in MPEG-2 TS. [Figure 9I] 1 is a diagram explaining the names and functions of descriptors used in MPEG-2 TS. [Figure 10A] FIG. 1 is a diagram explaining a protocol stack in an MMT broadcast transmission path. [Figure 10B] FIG. 1 is a diagram explaining a protocol stack in an MMT communication line. [Figure 10C]This is a diagram explaining the names and functions of the tables used in the TLV-SI of MMT. [Figure 10D] This is a diagram explaining the names and functions of the descriptors used in MMT's 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 the descriptors used in MMT-SI of MMT. [Figure 10H] This is a diagram explaining the names and functions of the descriptors used in MMT-SI of MMT. [Figure 10I] This is a diagram explaining the names and functions of the descriptors used in MMT-SI of MMT. [Figure 10J] FIG. 1 is a diagram for explaining the relationship between data transmission according to the MMT method and each table. [Figure 11A] 4 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. 4 is a diagram illustrating a data configuration of a network information table. [Figure 11C] FIG. 13 is a diagram for explaining the data structure of a terrestrial distribution system descriptor. [Figure 11D] 11 is a diagram illustrating the data structure of a service list descriptor. [Figure 11E] 11 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] 11A and 11B are diagrams illustrating a banner display when a channel is selected in accordance with an embodiment of the present invention. [Figure 13] FIG. 2 is a diagram illustrating a system clock configuration according to an embodiment of the present invention. [Figure 14] 2 is a diagram illustrating the data format of a TS packet in the MPEG2-TS format. FIG. [Figure 15A]FIG. 2 is a diagram for explaining the configuration of the NTP format. [Figure 15B] 13 is a diagram illustrating the data structure of an MPU timestamp descriptor. [Figure 16] 11 is a diagram illustrating a guide to switch to a backup broadcast when reception conditions deteriorate. FIG. [Figure 17] 11 is a diagram for explaining a case where a link terminal provides guidance for switching to a backup broadcast when reception conditions deteriorate. FIG. [Figure 18A] FIG. 1 is a diagram for explaining leap second adjustment for time insertion in the NTP system clock. [Figure 18B] FIG. 1 is a diagram for explaining leap second adjustment for time deletion in an NTP system clock. [Figure 19A] FIG. 2 is a diagram illustrating the data structure of TOT. [Figure 19B] 13 is a diagram illustrating the data structure of JST_time. [Figure 20] FIG. 2 is a diagram for explaining the data structure of an EIT. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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, an antenna 200, a broadcasting station radio tower 300, a broadcasting station server 400, a service provider server 500, a mobile telephone communication server 600, a base station 600B of a mobile telephone communication network, a portable information terminal 700, a broadband network 800 such as the Internet, and a router device 800R. 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 receiving function for an advanced digital broadcasting service. The broadcast receiving device 100 may further be equipped with a receiving function for an existing digital broadcasting service. Furthermore, the broadcast receiving device 100 is compatible with a broadcasting and communication cooperation system that combines a digital broadcasting service (an existing digital broadcasting service or an advanced digital broadcasting service) with a function using a broadband network, and combines the digital broadcasting service with acquisition of additional content via the broadband network, arithmetic processing in a server device, and presentation processing in cooperation with a mobile terminal device. The broadcast receiving device 100 receives a digital broadcast wave transmitted from a radio tower 300 via an antenna 200. The digital broadcast wave may be directly transmitted from the radio tower 300 to the antenna 200, or may be transmitted via a broadcasting satellite or a communication satellite (not shown). The broadcast signal retransmitted by a cable television station may be received via a cable line or the like. The broadcast receiving device 100 can also be connected to the Internet 800 via a router device 800R, and can transmit and receive data by communicating with each server device on the Internet 800.

[0016] Router device 800R is connected to Internet 800 by wireless or wired communication, and is connected to broadcast receiving device 100 by wired communication and to mobile information terminal 700 by 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] The radio tower 300 is a broadcasting facility of the broadcasting station, and transmits digital broadcast waves including various control information related to digital broadcasting services and content data of broadcast programs (video content, audio content, etc.). The broadcasting station also includes a broadcasting station server 400. The 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. The broadcasting station server 400 provides the content data and metadata to the service provider based on a contract. The content data and metadata are provided to the service provider through an API (Application Programming Interface) provided in the broadcasting station server 400.

[0018] The service provider server 500 is a server device prepared by a service provider to provide a service by the broadcasting and communication cooperation system. The service provider server 500 stores, manages, and distributes the content data and metadata provided by the broadcasting station server 400, and the content data and applications (operation programs and / or various data, etc.) created for the broadcasting and communication cooperation system. In addition, the service provider server 500 also has a function of searching for and providing a list of available applications in response to an inquiry from a television receiver. 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. A plurality of service provider servers 500 may be prepared for different services. The broadcasting station server 400 may also have the functions of the service provider server 500.

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

[0020] [Hardware configuration of broadcast receiving device] 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 in the broadcast receiving device 100.

[0023] The ROM (Read Only Memory) 103 is a non-volatile memory in which a basic operation program such as an operating system and other operation programs are stored, and a rewritable ROM such as an EEPROM (Electrically Erasable Programmable ROM) or a flash ROM is used. 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 program 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 part of the storage area in the storage (accumulation) unit 110.

[0024] The storage (accumulation) unit 110 stores the operation program and operation setting values ​​of the broadcast receiving device 100, personal information of the user of the broadcast receiving device 100, etc. It can also store operation programs downloaded via the Internet 800 and various data created by the operation 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 part of the area of ​​the storage (accumulation) unit 110 may replace all or part of the functions of the ROM 103. The storage (accumulation) unit 110 needs to hold the stored information even when power is not supplied from the outside to the broadcast receiving device 100. Therefore, for example, devices such as semiconductor element memories such as flash ROM and SSD (Solid State Drive), magnetic disk drives such as HDD (Hard Disc Drive), etc. are used.

[0025] The operation programs stored in ROM 103 or storage (accumulation) unit 110 can be added to, updated, or 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, and the like. The broadcast receiving device 100 may further include other communication units such as a BlueTooth (registered trademark) communication unit, an NFC communication unit, an infrared communication unit, and the like.

[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 processing (channel selection) by tuning to a channel of a predetermined service under the control of the main controller 101. Furthermore, they perform demodulation processing and waveform shaping processing of the modulated wave of the received signal, reconstruction processing of the frame structure and hierarchical structure, energy despreading processing, error correction decoding processing, etc., 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 receive digital broadcast waves of the current terrestrial digital broadcast service received by the antenna 200C, which is an antenna for receiving the current terrestrial digital broadcast. The first tuner / demodulator 130C can also receive a broadcast signal of one of the horizontally (H) polarized signal and the vertically (V) polarized signal of the dual-polarized terrestrial digital broadcast described below, and demodulate a segment of a layer that adopts the same modulation method as the current terrestrial digital broadcast service. The first tuner / demodulator 130C can also receive a broadcast signal of the layer division multiplexed terrestrial digital broadcast described below, and demodulate a layer that adopts the same modulation method as the current terrestrial digital broadcast service. The second tuner / demodulator 130T receives digital broadcast waves of the advanced terrestrial digital broadcast service received by the antenna 200T, which is an antenna for receiving the dual-polarized terrestrial digital broadcast, via the converter 201T. The third tuner / demodulator 130L receives digital broadcast waves of an advanced terrestrial digital broadcast service received by an antenna 200L, which is an antenna for receiving hierarchical division multiplexed terrestrial digital broadcasts, via a converter 201L. The fourth tuner / demodulator 130B receives digital broadcast waves of an advanced BS (Broadcasting Satellite) digital broadcast service or an advanced CS (Communication Satellite) digital broadcast service received by an antenna 200B, which is an antenna for receiving both BS and CS, via a converter 201B.

[0029] The term "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] In addition, the current terrestrial digital broadcasting mentioned above is a broadcast signal of a terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontal by 1080 pixels vertical.

[0032] Dual-polarized terrestrial digital broadcasting (advanced terrestrial digital broadcasting that employs a dual-polarized transmission method) will be described in more detail below, but it is a broadcast signal for a terrestrial digital broadcasting service that can transmit video with a maximum resolution exceeding 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 exceeding 1920 horizontal pixels by 1080 vertical pixels in some divided segments in both of the multiple polarized waves.

[0033] In the description of each embodiment of the present invention, when the expression "multiple polarized waves" is used for dual-polarized terrestrial digital broadcasting, it means two polarized waves, horizontal (H) polarized waves and vertical (V) polarized waves, unless otherwise specified. In addition, even when the expression "polarized waves" is simply used, it means a "polarized signal". In addition, in one or both of the multiple polarized waves, some of the divided segments can transmit the above-mentioned current terrestrial digital broadcasting that transmits video with a maximum resolution of 1920 horizontal pixels x 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 that transmits video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels and the terrestrial digital broadcasting service that can transmit video with a maximum resolution of more than 1920 horizontal pixels x 1080 vertical pixels.

[0034] In addition, the details of hierarchical division multiplexing terrestrial digital broadcasting (advanced terrestrial digital broadcasting employing a hierarchical division multiplexing transmission method) will be described later, but it is a broadcast signal of a terrestrial digital broadcasting service capable of transmitting video with a maximum resolution of more than 1920 pixels horizontally by 1080 pixels vertically. 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 for transmitting the digital broadcasting signals is different. In the hierarchical division multiplexing terrestrial digital broadcasting of each embodiment of the present invention, as the plurality of digital broadcasting signals with different signal levels, the broadcast signal of a current terrestrial digital broadcasting service transmitting video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically and the broadcast signal of a terrestrial digital broadcasting service capable of transmitting video with a maximum resolution of more than 1920 pixels horizontally by 1080 pixels vertically can be hierarchically multiplexed and transmitted in the frequency band of the same physical channel. In other words, in the hierarchical division multiplexing terrestrial digital broadcasting of each embodiment of the present invention, it is possible to simultaneously transmit, on multiple hierarchical layers with different signal levels, a current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontal by 1080 pixels vertical, and a terrestrial digital broadcasting service that can transmit video with a maximum resolution of more than 1920 pixels horizontal by 1080 pixels vertical.

[0035] In addition, the broadcast receiving device in each embodiment of the present invention may be configured to be able to receive advanced digital broadcasts appropriately, and does not necessarily have to include all of the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, the third tuner / demodulation unit 130L, and the fourth tuner / demodulation unit 130B. For example, it is sufficient to include at least one of the second tuner / demodulation unit 130T or the third tuner / demodulation unit 130L. In order to realize more advanced functions, the broadcast receiving device may include one or more of the above four tuner / demodulation units in addition to one of the second tuner / demodulation unit 130T or the third tuner / demodulation unit 130L.

[0036] Furthermore, the antennas 200C, 200T, and 200L may be shared as appropriate. Furthermore, among the first tuner / demodulator 130C, the second tuner / demodulator 130T, and the 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 respectively 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 stream input to the first decoder unit 140S and the second decoder unit 140U may be a packet stream in a format 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 a conditional access (CA) process, a demultiplexing process for separating and extracting video data, audio data, and various information data from a packet stream based on various control information included in the packet stream, a decoding process for video data and audio data, a process for acquiring program information and generating an EPG (Electronic Program Guide), a process for playing back data broadcast screens and multimedia data, etc. Also, a process for superimposing the generated EPG and the played back multimedia data with the decoded video data and audio data is performed.

[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 superimposition processing of OSD (On Screen Display) data. 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 to provide 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 appropriate processing such as selection and / or mixing under the control of the main control unit 101. The speaker unit 195 outputs the audio data selected and / or mixed by the audio selection unit 194, and provides it to the user of the broadcast receiving device 100. The audio output unit 196 is an audio output interface that outputs the audio data selected and / or mixed by the audio selection unit 194 to the outside.

[0041] The digital interface unit 125 is an interface for outputting or inputting a packet stream including encoded digital video data and / or digital audio data. The digital interface unit 125 can directly output the packet stream inputted by the first decoder unit 140S or the second decoder unit 140U from the first tuner / demodulator unit 130C, the second tuner / demodulator unit 130T, the third tuner / demodulator unit 130L, or the fourth tuner / demodulator unit 130B. The digital interface unit 125 may also control the packet stream inputted from the outside via the digital interface unit 125 to be inputted 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 so as 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 / audio signals from an external video / audio output device, outputs analog video / audio signals to an external video / audio input device, 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 in the figure, and an operation key with an array of button switches. Only one of them may be used. The operation input unit 180 can be replaced by a touch panel or the like arranged on top of the monitor unit 192. It may also be replaced by a keyboard or the like connected to the extended interface unit 124. The remote control can be replaced by a mobile information terminal 700 equipped with a remote control command transmission function.

[0044] In addition, when 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. In addition, the broadcast receiving device 100 may be an optical disk drive recorder such as a DVD (Digital Versatile Disc) recorder, a magnetic disk drive recorder such as a HDD recorder, an STB (Set Top Box), or the like. It may also be a PC (Personal Computer) or a tablet terminal equipped with a function for receiving digital broadcast services. In the case where the broadcast receiving device 100 is a DVD recorder, an HDD recorder, an STB, or the like, the monitor unit 192 and the speaker unit 195 are not essential components. By connecting an external monitor and an external speaker to the video output unit 193 and the audio output unit 196 or the digital interface unit 125, the same operation as a television receiver or the like is possible.

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

[0046] The channel selection / detection unit 131C inputs the current digital broadcast wave received by the antenna 200C and selects a channel based on the channel selection control signal. The TMCC decoding unit 132C extracts the TMCC signal from the output signal of the channel selection / detection unit 131C and acquires various TMCC information. The acquired TMCC information is used to control each process in the subsequent stages. The details of the TMCC signal and the 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), 64QAM, etc., based on TMCC information, etc., and performs demodulation processing including frequency deinterleaving, time deinterleaving, carrier demapping, etc. The demodulation unit 133C may be further compatible with 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 inverse diffusion 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 other than those described above. Also, the packet stream reproduced and output by the stream reproduction unit 134C is, for example, MPEG-2 TS, etc. It may also be a packet stream in another format.

[0049] FIG. 2C is a block diagram showing an example of a detailed configuration of the 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. Note that the operation of the channel selection process in the channel selection / detection unit 131H and the operation of the channel selection process in the channel selection / detection unit 131V may be controlled in conjunction with each other, or may be controlled independently of each other. In other words, it is possible to treat channel selection / detection unit 131H and 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, and it is also possible to treat channel selection / detection unit 131H and channel selection / detection unit 131V as two independent channel selection / detection units and control them to each select two different channels of a digital broadcasting service transmitted using only horizontal polarization (or only vertical polarization).

[0051] In addition, the horizontal (H) polarized signal and vertical (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 based on broadcast waves whose polarization directions differ by approximately 90 degrees, and the horizontal (H) polarized signal and vertical (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 processing, etc. The demodulation units 133H and 133V may be further compatible with modulation methods different from the above-mentioned modulation methods.

[0054] The stream reproduction unit 134H and the stream reproduction unit 134V each perform a hierarchical division process, an inner code error correction process such as Viterbi decoding or LDPC (Low Density Parity Check) decoding, an energy inverse diffusion process, a stream reproduction process, an outer code error correction process such as RS decoding or BCH decoding, and the like. Note that the error correction process may be a process different from the above-mentioned methods. The packet stream reproduced and output by the stream reproduction unit 134H is, for example, MPEG-2 TS or the like. The packet stream reproduced and output by the stream reproduction unit 134V is, for example, MPEG-2 TS or TLV including an MMT packet stream. Each may 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 (Upper Layer: UL) and the lower layer (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 input to 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 broadcast service or the advanced CS digital broadcast 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. In addition, TMCC decoding unit 132B, demodulation unit 133B, and stream reproduction unit 134B perform operations similar to those of 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] The selection unit 141S selects and outputs one of the packet streams input from the first tuner / demodulation unit 130C, the packet streams input from the second tuner / demodulation unit 130T, and the packet streams input from the third tuner / demodulation unit 130L under the control of the main control unit 101. The packet streams input from the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, and the third tuner / demodulation unit 130L are, for example, MPEG-2 TS, etc. The CA descrambler 142S performs decryption processing of the encryption algorithm of a predetermined scrambling method based on various control information related to limited reception superimposed on the packet stream.

[0063] The demultiplexing unit 143S is a stream decoder, and separates and extracts video data, audio data, superimposed text data, subtitle data, program information data, and the like, 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, and the like to the data decoder 144S. The demultiplexing unit 143S may receive a packet stream (e.g., MPEG-2 PS, etc.) acquired from a server device on the Internet 800 via the LAN communication unit 121. The demultiplexing unit 143S can output the packet streams input from the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, and the third tuner / demodulation unit 130L to the outside via the digital interface 125, and can receive a packet stream acquired from the outside via the digital interface 125.

[0064] The video decoder 145S performs a process of decoding the compressed and encoded video information, a process of colorimetry conversion and a process of dynamic range conversion on the decoded video information, etc., for the video data input from the demultiplexer 143S. In addition, the video decoder 145S performs a process of resolution conversion (up / down conversion) and the like based on the control of the main controller 101, and outputs the video data at a resolution such as UHD (3840 pixels horizontal x 2160 pixels vertical), HD (1920 pixels horizontal x 1080 pixels vertical), or SD (720 pixels horizontal x 480 pixels vertical) as appropriate. The video data may be output at other resolutions. The audio decoder 146S performs a process of decoding the compressed and encoded audio information, etc. In addition, the audio decoder 146S performs a process of downmixing and the like based on the control of the main controller 101, and outputs the audio data with a number of channels such as 22.2ch, 7.1ch, 5.1ch, or 2ch. Note that a plurality of the video decoders 145S and the audio decoders 146S may be provided in order to simultaneously perform a plurality of processes of decoding the video data and the audio data.

[0065] The data decoder 144S performs processes such as generating an EPG based on program information data, generating a data broadcast screen based on BML data, and controlling an integrated application based on a broadcast communication integrated function. The data decoder 144S has a BML browser function for executing BML documents, and the data broadcast screen generation process is executed by the BML browser function. The data decoder 144S also performs processes such as decoding superimposed data to generate superimposed information and decoding subtitle data to generate subtitle information.

[0066] The superimposing unit 147S, the superimposing unit 148S, and the superimposing unit 149S each perform a process of superimposing the video data output from the video decoder 145S and the EPG or the data broadcast screen output from the data decoder 144S. The synthesizing unit 151S performs a process 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 based on the control of the main control unit 101. The functions of the superimposing unit 147S, the superimposing unit 148S, the superimposing unit 149S, and the 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 selection unit 141U selects and outputs one of the packet streams input from the second tuner / demodulation unit 130T, the third tuner / demodulation unit 130L, and the fourth tuner / demodulation unit 130B under the control of the main control unit 101. The packet streams input from the second tuner / demodulation unit 130T, the third tuner / demodulation unit 130L, and the fourth tuner / demodulation unit 130B are, for example, MMT packet streams or TLVs including MMT packet streams. The packet streams may be in the MPEG-2 TS format that employs HEVC (High Efficiency Video Coding) or the like as the video compression method. The CA descrambler 142U performs a decryption process of the encryption algorithm of a predetermined scrambling method based on various control information related to limited reception superimposed on the packet stream.

[0069] The demultiplexer 143U is a stream decoder, and separates and extracts video data, audio data, superimposed text data, subtitle data, program information data, and the like, based on various control information included 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, and the like to the multimedia decoder 144U. The demultiplexer 143U may receive a packet stream (e.g., MPEG-2 PS or MMT packet stream, etc.) 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, and 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 for generating an EPG based on program information data, processing for generating a multimedia screen based on multimedia data, processing for controlling an integrated application based on a broadcast / communication integrated function, etc. The multimedia decoder 144U has an HTML browser function for executing 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 symbols in the explanation of video decoder 145S, audio decoder 146S, superimposition unit 147S, superimposition unit 148S, superimposition unit 149S, synthesis unit 151S, and selection unit 150S in FIG. 2F is replaced with U, the explanation becomes the same as the explanation of 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, and shows an example of the software configuration in the storage (accumulation) unit 110 (or ROM 103, the same applies below) and RAM 104. A basic operation program 1001, a receiving function program 1002, a browser program 1003, a content management program 1004, and other operation programs 1009 are stored in the storage (accumulation) unit 110. 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 and the like used when communicating with and cooperating with external mobile terminal devices and server devices, and a various 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 constitute 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, and the main control unit 101 executes each loaded operation program to constitute a receiving function control unit 1102, a browser engine 1103, and a content management unit 1104. The RAM 104 also includes a temporary storage area 1200 for temporarily holding data created when each operation program is executed as necessary.

[0074] In the following, 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 as the basic operation control unit 1101 controlling each operation block. 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 the demultiplexing process (stream decoding process), the video data decoding process, the audio data decoding process, etc. in the first decoder unit 140S and the second decoder unit 140H. The multimedia (MM) data reproducing unit 1102d mainly controls the BML data reproducing process, the superimposed text data decoding process, the subtitle data decoding process, the control process of the communication linkage application in the first decoder unit 140S, the HTML data reproducing process, the multimedia screen generating process, the control process of the communication linkage application in the second decoder unit 140H, etc. The EPG generating unit 1102e mainly controls the EPG generating process and the display process of the generated EPG in the first decoder unit 140S and the second decoder unit 140H. The presentation processing unit 1102f controls the colorimetry conversion process, the dynamic range conversion process, the resolution conversion process, the audio downmix process, etc. in the first decoder unit 140S and the second decoder unit 140H, and controls the video selection unit 191, the audio selection unit 194, etc.

[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 making 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 of 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 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. Moreover, the operation programs stored in 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 be newly acquired or updated via broadcast waves.

[0079] [Broadcasting 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 in 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] In the following, for ease of explanation, the process in which the main control unit 401 loads the basic operation program 4001 stored in the storage unit 410 into the RAM 404 and executes it to control each operation block will be described as being performed by the basic operation control unit 4101. 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 transmission control unit 4103 performs time schedule management, etc., when transmitting streams including content data of broadcast programs stored in the content data memory area 4011 and program titles, program IDs, and copy control information of program content of broadcast programs stored in the metadata memory area 4012 via the digital broadcast signal transmission 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 sending unit 460 performs processing such as modulation on a stream composed of content data of each broadcast program and program information data stored in the content data storage area 4011, and sends it out 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 (operation programs and / or various data, etc.) required to realize each service of the broadcasting / communication cooperation system, which are to be 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] In the following, for ease of explanation, the process in which the main control unit 501 loads the basic operation program 5001 stored in the storage unit 510 into the RAM 504 and executes it to control each operation block will be described 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, the application management / distribution control unit 5103 also performs authentication processing of the television receiver as necessary when distributing each application to each television receiver.

[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 a router device 800R. The LAN communication unit 521 includes an encoding circuit, a decoding circuit, and the like.

[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] The broadcast receiving device 100 can receive a terrestrial digital broadcasting service that shares at least some specifications with the ISDB-T (Integrated Services Digital Broadcasting for Terrestrial Television Broadcasting) system. Specifically, the dual-polarized terrestrial digital broadcasting that the second tuner / demodulator 130T can receive is an advanced terrestrial digital broadcasting that shares some specifications with the ISDB-T system. Moreover, the hierarchical division multiplexing terrestrial digital broadcasting that the third tuner / demodulator 130L can receive is an advanced terrestrial digital broadcasting that shares some specifications with the ISDB-T system. The current terrestrial digital broadcasting that the first tuner / demodulator 130C can receive is terrestrial digital broadcasting of the ISDB-T system. Moreover, the advanced BS digital broadcasting and advanced CS digital broadcasting that the fourth tuner / demodulator 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 adopts OFDM (Orthogonal Frequency Division Multiplexing), which is one of the multi-carrier methods, as the transmission method, similar to the ISDB-T method. Since OFDM is a multi-carrier method, the symbol length is long, and it is effective to add a redundant part in the time axis direction called a guard interval, and it is possible to reduce the influence of multipath within the range of the guard interval. Therefore, it is possible to realize a SFN (Single Frequency Network), and it is possible to effectively use frequencies.

[0097] In the dual-polarized terrestrial digital broadcasting and hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment, the OFDM carrier is divided into groups called segments, as in the ISDB-T system, and as shown in FIG. 4A, one channel bandwidth of a digital broadcasting service is composed of 13 segments. The center of the band is the position of segment 0, and segment numbers (0 to 12) are assigned sequentially above and below this. The transmission path coding of the dual-polarized terrestrial digital broadcasting and hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment is performed in units of OFDM segments. For this reason, it is possible to define hierarchical transmission, and for example, within the bandwidth of one television channel, some OFDM segments can be assigned to fixed reception services and the rest to mobile reception services. In hierarchical transmission, each layer is composed of one or more OFDM segments, and parameters such as the carrier modulation method, the coding rate of the inner code, and the time interleaving length can be set for each layer. The number of layers can be set arbitrarily, for example, up to a maximum of 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 and transmission line coding parameters of each layer are determined according to organization information and are transmitted by a TMCC signal, which is control information for assisting the operation of the receiver.

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

[0099] For example, the hierarchical allocation in Fig. 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 and vertically polarized waves. Specifically, the above one segment of horizontal polarization can be used to transmit the current mobile reception service of terrestrial digital broadcasting as hierarchical layer A. (Note that the same service of the current mobile reception service of terrestrial digital broadcasting may be transmitted by the above one segment of vertical polarization. In this case, this is also treated as hierarchical layer A.) Also, the above seven segments of horizontal polarization can be used to transmit the terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontally x 1080 pixels vertically, which is the current terrestrial digital broadcasting, 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 capable of transmitting video with a maximum resolution of more than 1920 pixels horizontally by 1080 pixels vertically using the above 5 segments of both horizontal and vertical polarization, for a total of 10 segments, 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 second tuner / demodulator unit 130T of broadcast receiving device 100.

[0100] For example, the hierarchical allocation in FIG. 4B(2) can be used as an example different from 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 horizontal and vertical polarization. Specifically, the above one segment of horizontal polarization can be used to transmit the current mobile reception service of terrestrial digital broadcasting as hierarchical A. (Note that the same service of the current mobile reception service of terrestrial digital broadcasting may be transmitted by the above one segment of vertical polarization. In this case, this is also treated as hierarchical A.) Furthermore, the above five segments of both horizontal and vertical polarization, totaling 10 segments, may be used to transmit an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 pixels horizontally by 1080 pixels vertically as hierarchical B. In addition, the above seven segments of horizontal polarization can be used to transmit the terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically, which is the current terrestrial digital broadcasting. (Note that a terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontal by 1080 pixels vertical may transmit the same service using the above seven segments of vertical polarization. In this case, this is also treated as layer C.) Details of this transmission will be described later. The transmission wave with the segment 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 the current terrestrial digital broadcasting. Specifically, when used in the hierarchical division multiplexing terrestrial digital broadcasting, a mobile reception service of the current terrestrial digital broadcasting may be transmitted in one segment in the figure as the A hierarchical layer. Furthermore, the 12 segments in the figure may be configured to transmit an advanced terrestrial digital broadcasting service capable of transmitting a video having a maximum resolution of more than 1920 pixels horizontally by 1080 pixels vertically as the B hierarchical layer. The transmission wave of the 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 the current terrestrial digital broadcasting, a mobile reception service of the current terrestrial digital broadcasting may be transmitted in one segment in the figure as the A hierarchical layer, and a terrestrial digital broadcasting service that transmits a video having a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically, which is the current terrestrial digital broadcasting, may be transmitted in the 12 segments in the figure as the B hierarchical layer. 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 system on the broadcasting station side that realizes the generation process of the OFDM transmission wave, which is the digital broadcast wave of the dual-polarized terrestrial digital broadcasting and the hierarchical division multiplexing terrestrial digital broadcasting according to the present embodiment. The information source coding unit 411 respectively codes the video / audio / various data. The multiplexing unit / limited reception processing unit 415 multiplexes the video / audio / various data respectively coded by the information source coding unit 411, and further performs processing corresponding to limited reception as appropriate, and outputs it as a packet stream. The information source coding unit 411 and the multiplexing unit / limited reception processing unit 415 can exist in parallel in a plurality of units, and generate a plurality of packet streams. The transmission line coding unit 416 re-multiplexes the plurality of packet streams into one packet stream, performs transmission line coding processing, and outputs it as an OFDM transmission wave. The configuration shown in FIG. 4C is common to the ISDB-T system as a configuration that realizes the generation process of the OFDM transmission wave, although the details of the information source coding and transmission line coding methods are different. Therefore, among the multiple information source coding units 411 and the multiplexing unit / conditional access processing unit 415, some may be configured for ISDB-T terrestrial digital broadcasting services and some may be configured for advanced terrestrial digital broadcasting services, and packet streams of multiple different terrestrial digital broadcasting services may be multiplexed in the transmission path coding unit 416. When the multiplexing unit / conditional access processing unit 415 is configured for ISDB-T terrestrial digital broadcasting services, it is sufficient to generate MPEG-2TS, which is a stream of TSP (Transport Stream Packet) defined in MPEG-2 Systems. Also, when the multiplexing unit / conditional access processing unit 415 is configured for advanced terrestrial digital broadcasting services, it is sufficient to generate an MMT packet stream or a TLV stream including MMT packets, or a stream of TSP defined in other systems. Naturally, it is also possible to configure all of the multiple information source coding units 411 and the multiplexing unit / conditional access processing unit 415 for advanced terrestrial digital broadcasting services, and to make all packet streams multiplexed in the transmission path coding unit 416 packet streams for advanced terrestrial digital broadcasting services.

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

[0104] First, FIG. 4D(1) will be described. FIG. 4D(1) shows the configuration of the transmission line coding unit 416 when only OFDM transmission waves of digital broadcasting of the current terrestrial digital broadcasting service are generated. The OFDM transmission waves transmitted in this configuration have, for example, the segment configuration of FIG. 4B(3). The packet stream input from the multiplexing unit / conditional reception processing unit 415 and subjected to re-multiplexing processing is added with redundancy for error correction, and various interleaving processes such as byte interleaving, bit interleaving, time interleaving, and frequency interleaving are performed. Then, processing by IFFT (Inverse Fast Fourier Transform) is performed 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 code processing, power dispersal processing, byte interleaving, inner code processing, and mapping processing are configured to be able to be processed separately for each layer such as A layer and B layer. (Note that while the current digital broadcasting service for terrestrial digital broadcasting has two layers for operational purposes, up to three layers can be transmitted, so an example of three layers is shown in FIG. 4D(1).) The mapping process is a carrier modulation process. The packet stream input from the multiplexing unit / limited reception processing unit 415 may be multiplexed with information such as TMCC information, mode, and guard interval ratio. The packet stream input to the transmission path coding unit 416 may be a TSP stream defined by MPEG-2 Systems, as described above. The OFDM transmission wave generated by the configuration of FIG. 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 line coding unit 416 when generating the OFDM transmission wave of the dual-polarized terrestrial digital broadcasting according to this embodiment. The OFDM transmission wave transmitted in this configuration has, 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 / limited reception 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 signal is processed by IFFT together with the pilot signal, TMCC signal, and AC signal, and is subjected to guard interval addition processing, followed by orthogonal modulation to become an OFDM transmission wave.

[0106] In the configuration example of FIG. 4D(2), the outer code processing, power dispersal processing, byte interleaving, inner code processing, mapping processing, and time interleaving are configured to 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 the OFDM transmission wave of horizontal polarization (H) but also the OFDM transmission wave of vertical polarization (V) is generated, and the processing flow branches into two systems. When branching from the processing system of horizontal polarization (H) to the processing system of vertical polarization (V), whether the same data as the processing system of horizontal polarization (H) is branched to the processing system of vertical polarization (V), data different from the processing system of horizontal polarization (H) is branched to the processing system of vertical polarization (V), or no data is branched to the processing system of vertical polarization (V) can be made different for each layer according to the segment configuration described in FIG. 4B(1) or (2).

[0107] The processing of the outer code, inner code, mapping, etc. shown in the configuration of FIG. 4D(2) can use processing compatible with the configuration of FIG. 4D(1) as well as more advanced processing not adopted in each processing of the configuration of FIG. 4D(1). Specifically, in the configuration of FIG. 4D(2), in the part where processing is performed for each layer, in the layer where the current terrestrial digital broadcasting mobile reception service and the current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically are transmitted, processing of the outer code, inner code, mapping, etc. is performed compatible with the configuration of FIG. 4D(1). On the other hand, in the configuration of FIG. 4D(2), in the part where processing is performed for each layer, in the layer where the advanced terrestrial digital broadcasting service that can transmit video with a maximum resolution of more than 1920 pixels horizontally by 1080 pixels vertically is transmitted, processing of the outer code, inner code, mapping, etc. may be configured to use more advanced processing not adopted in each processing of the configuration of FIG. 4D(1).

[0108] In addition, in the dual-polarized terrestrial digital broadcasting according to this embodiment, the allocation of the hierarchical layers and the terrestrial digital broadcasting services to be transmitted can be switched by TMCC information, which will be described later. Therefore, it is desirable to configure the processing such as the outer code, inner code, mapping, etc., applied to each layer to be switchable by 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 the current terrestrial digital broadcasting services, or more advanced different processing may be performed. Also, for layers transmitting advanced terrestrial digital broadcasting services, some interleaving may be omitted.

[0110] In addition, in the configuration of Fig. 4D(2), the input stream serving as the source of the layer in which the current terrestrial digital broadcasting mobile reception service and the current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels are transmitted may be a TSP stream defined by MPEG-2 Systems, which is adopted in the current terrestrial digital broadcasting, among the packet streams input to the transmission line coding unit 416. The input stream serving as the source of the layer in which the advanced terrestrial digital broadcasting service is transmitted in the configuration of Fig. 4D(2) may be a stream defined by a system other than the TSP stream defined by MPEG-2 Systems, such as an MMT packet stream or a TLV including an MMT packet, among the packet streams input to the transmission line coding unit 416. However, the TSP stream defined by MPEG-2 Systems may be adopted in 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 the current terrestrial digital broadcasting are maintained in a layer in which the current terrestrial digital broadcasting mobile reception service and the current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels x 1080 vertical pixels are transmitted. As a result, even if a receiver for an existing terrestrial digital broadcasting service receives either the horizontally polarized OFDM transmission wave or the 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 a layer in which the current terrestrial digital broadcasting mobile reception service and the current terrestrial digital broadcasting service that transmits 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 by 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 appropriately 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 / limited reception 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. After that, the signal is processed by IFFT 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 FIG. 4D(3), the modulated wave transmitted in the upper layer and the modulated wave transmitted in the lower layer are generated, and then multiplexed to generate an OFDM transmission wave, which is a digital broadcast wave. The processing system shown on the upper side of the configuration of FIG. 4D(3) is a processing system for generating the modulated wave transmitted in the upper layer, and the processing system shown on the lower side is a processing system for generating the modulated wave transmitted in the lower layer. Data transmitted through the processing system for generating the modulated wave transmitted in the upper layer of FIG. 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, and various processes in the processing system for generating the modulated wave transmitted in the upper layer of FIG. 4D(3) are the same as or compatible with the various processes in FIG. 4D(1). The modulated wave transmitted in the upper layer of FIG. 4D(3) has, for example, the segment configuration of FIG. 4B(3) like the transmission wave in FIG. 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 horizontal x 1080 pixels vertical. 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 horizontal x 1080 pixels vertical, and for example, the processing of the outer code, inner code, mapping, etc. may be configured to use more advanced processing not adopted in the processing of the configuration of Fig. 4D(1).

[0116] The modulated wave transmitted in the lower layer of FIG. 4D(3) may be, for example, assigned to an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 pixels horizontally and 1080 pixels vertically, with all 13 segments as layer A. Alternatively, the segment configuration of FIG. 4B(3) may be used to transmit the current terrestrial digital broadcasting mobile reception service in 1-segment layer A, and the advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 pixels horizontally and 1080 pixels vertically in 12-segment layer B. In the latter case, as in FIG. 4D(2), it is sufficient to configure the configuration so that processing can be switched for each layer, such as layer A and layer B, from outer coding processing to time interleaving processing. As in the explanation of FIG. 4D(2), in the layer transmitting the current terrestrial digital broadcasting mobile reception service, processing compatible with the current terrestrial digital broadcasting must be maintained.

[0117] In the configuration of FIG. 4D(3), an OFDM transmission wave is generated, which is a terrestrial digital broadcast wave that is multiplexed with a modulated wave transmitted in an upper layer and a modulated wave transmitted in a lower layer. The technology for separating the modulated wave transmitted in an upper layer from the OFDM transmission wave is also installed in the receiver of the current terrestrial digital broadcast service, so that the broadcast signal of 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 horizontal x 1080 pixels vertical, which are included in the modulated wave transmitted in the upper layer, can be correctly received and demodulated by the receiver of the current terrestrial digital broadcast service. On the other hand, the broadcast signal of the advanced terrestrial digital broadcast service that can transmit video with a maximum resolution of more than 1920 pixels horizontal x 1080 pixels vertical, which is included in the modulated wave transmitted in the lower layer, can be received and demodulated by the broadcast receiver 100 according to the embodiment of the present invention.

[0118] That is, in the configuration of Fig. 4D(3), it is possible to generate digital broadcast waves that can be suitably received and demodulated by broadcast receiving devices compatible with advanced terrestrial digital broadcast services, as well as by receiving devices for existing terrestrial digital broadcast services. Also, unlike the configuration of Fig. 4D(2), the configuration of Fig. 4D(3) does not require the use of multiple polarized waves, and can generate OFDM transmission waves that can be received more easily.

[0119] In the OFDM transmission wave generation process according to FIG. 4D(1), FIG. 4D(2), and FIG. 4D(3) of this embodiment, three modes with different numbers of carriers are prepared in consideration of compatibility with the distance between SFN stations and resistance to Doppler shift in mobile reception. It is also possible to prepare another mode with different numbers of carriers. In a mode with a large number of carriers, the effective symbol length becomes longer, and if the guard interval ratio (guard interval length / effective symbol length) is the same, the guard interval length becomes longer, and it is possible to provide resistance to multipath with a long delay time difference. On the other hand, in a mode with a small number of carriers, the carrier interval becomes wider, and it is possible to reduce the influence of inter-carrier interference caused by Doppler shift occurring in mobile reception, etc.

[0120] In the OFDM transmission wave generation process according to FIG. 4D(1), FIG. 4D(2), and FIG. 4D(3) of this embodiment, parameters such as the carrier modulation method, the coding rate of the inner code, and the time interleave length can be set for each layer consisting of one or more OFDM segments. FIG. 4E shows an example of transmission parameters for each OFDM segment identified by the mode of the system according to this embodiment. Note that the carrier modulation method in the figure refers to the modulation method of the "data" carrier. The SP signal, CP signal, TMCC signal, and AC signal adopt a modulation method different from the modulation method of the "data" carrier. Since these signals are signals for which resistance to noise is more important than the amount of information, a modulation method is adopted in which mapping is performed on a small-value constellation (BPSK or DBPSK, i.e., 2 states) with fewer states than the modulation method of the "data" carrier (both QPSK or more, i.e., 4 states or more), thereby improving resistance to noise.

[0121] In addition, the numerical values ​​of the carrier numbers are values ​​when QPSK, 16QAM, 64QAM, etc. are set as the carrier modulation method on the left side of the diagonal line, and values ​​when DQPSK is set as the carrier modulation method on the right side of the diagonal line. In the figure, the underlined parameters are parameters that are not compatible with the current terrestrial digital broadcasting mobile reception service. Specifically, the modulation methods of the "data" carriers, 256QAM, 1024QAM, and 4096QAM, are not adopted in the current terrestrial digital broadcasting service. Therefore, in the processing at the layer that requires compatibility with the current terrestrial digital broadcasting service in the OFDM broadcast wave generation processing related to Figures 4D(1), 4D(2), and 4D(3) of this embodiment, the modulation methods of the "data" carriers, 256QAM, 1024QAM, and 4096QAM are not used. For "data" carriers transmitted at a level 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, more multi-value modulation methods such as 256QAM (256 states), 1024QAM (1024 states), and 4096QAM (4096 states) may be applied. Also, modulation methods different from these may be adopted.

[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] In addition, the LDPC code is not adopted as an inner code processing method in the current terrestrial digital broadcasting service. Therefore, in the OFDM broadcast wave generation processing according to FIG. 4D(1), FIG. 4D(2), and FIG. 4D(3) of this embodiment, in the processing in the layer that needs to be compatible with the current terrestrial digital broadcasting service, the LDPC code is not used. For data transmitted in the layer corresponding to the advanced terrestrial digital broadcasting service, the LDPC code may be applied as an inner code. In addition, the BCH code is not adopted as an outer code processing method in the current terrestrial digital broadcasting service. Therefore, in the OFDM broadcast wave generation processing according to FIG. 4D(1), FIG. 4D(2), and FIG. 4D(3) of this embodiment, in the processing in the layer that needs to be compatible with the current terrestrial digital broadcasting service, the BCH code is not used. For data transmitted in the layer corresponding to the advanced terrestrial digital broadcasting service, the BCH code may be applied as an outer code.

[0124] FIG. 4F shows an example of transmission signal parameters for one physical channel (6 MHz bandwidth) in the OFDM broadcast wave generation process according to FIG. 4D(1), FIG. 4D(2), and FIG. 4D(3) of this embodiment. In the OFDM broadcast wave generation process according to FIG. 4D(1), FIG. 4D(2), and FIG. 4D(3) of this embodiment, parameters compatible with the current terrestrial digital broadcast service are basically adopted as parameters in FIG. 4F for compatibility with the current terrestrial digital broadcast service. However, when all segments are assigned to an advanced terrestrial digital broadcast service in the modulated wave transmitted in the lower layer of FIG. 4D(3), 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 are demodulation standards, and carriers for transmitting TMCC signals, which are 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. In addition, a concatenated code is adopted for error correction, and a shortened Reed-Solomon (204,188) code is adopted 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 is adopted as the inner code. Both the outer code and the inner code may use coding different from the above. The information rate differs depending on parameters such as the carrier modulation format, the convolutional coding rate, and the guard interval ratio.

[0126] Moreover, one frame consists of 204 symbols, and one frame contains an integer number of TSPs. Transmission parameters are switched at the boundaries of these frames.

[0127] Pilot signals that serve as the basis for demodulation include SP (Scattered Pilot), CP (Continual Pilot), AC (Auxiliary Channel) 1, and AC2. Figure 4G shows an example of an arrangement image of pilot signals, etc., in a segment in the case of synchronous modulation (QPSK, 16QAM, 64QAM, 256QAM, 1024QAM, 4096QAM, etc.). SP is inserted into a segment of synchronous modulation and is transmitted once every 12 carriers in the carrier number (frequency axis) direction and once every 4 symbols in the OFDM symbol number (time axis) direction. Since the amplitude and phase of SP are known, it can be used as a basis for synchronous demodulation. Figure 4H shows an example of an arrangement image of pilot signals, etc., in a segment in the case of differential modulation (DQPSK, etc.). CP is a continuous signal inserted at the left end of a segment of differential modulation and is 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 layout images shown in Figures 4G and 4H are examples for mode 3, with carrier numbers ranging from 0 to 431, but in mode 1 and mode 2, they are ranging from 0 to 107 and 0 to 215, respectively. Carriers transmitting AC1, AC2, and TMCC may be determined in advance for each segment. Carriers transmitting AC1, AC2, and TMCC are randomly laid out 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 demodulation operation of the receiver, such as the hierarchical structure and transmission parameters of the OFDM segments. The TMCC signal is transmitted by a carrier for TMCC transmission defined in each segment. FIG. 5A shows an example of bit allocation of the TMCC carrier. The TMCC carrier is composed 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, and are composed of 16-bit words. Two types of synchronization signals, w0 and w1, are defined, and w0 and w1 are sent alternately for each 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 describe TMCC information. B122 to B203 are parity bits.

[0131] The TMCC information of the OFDM transmission wave according to the present embodiment may be configured to include information for assisting the demodulation and decoding operation of the receiver, such as, for example, a system identification, a transmission parameter switching index, a start control signal (start flag for emergency warning broadcast), current information, next information, a frequency conversion processing 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. The transmission parameters are switched on a frame-by-frame basis. FIG. 5B shows an example of bit allocation of the TMCC information. FIG. 5C shows an example of the configuration of the transmission parameter information included in the current information / next information. The connected transmission phase correction amount is control information used in the case of a common transmission method such as terrestrial digital sound broadcasting ISDB-TSB (ISDB for Terrestrial Sound Broadcasting), and a 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 using a common transmission method, "01" is set. 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 the advanced terrestrial digital television broadcasting system, broadcast wave transmission using the dual-polarized transmission method or the hierarchical division multiplexing method makes it possible to simultaneously transmit 2K broadcast programs (broadcast programs with images of 1920 pixels horizontal x 1080 pixels vertical, and may include broadcast programs with images of lower resolution) and 4K broadcast programs (broadcast programs with images exceeding 1920 pixels horizontal x 1080 pixels vertical) within the same service.

[0133] The transmission parameter switching index is used to notify the receiver of the switching timing by counting down when switching transmission parameters. This index is normally set to the 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 the frame synchronization next to the frame in which "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 Fig. 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. When 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] FIG. 5E shows an example of bit allocation for the carrier modulation mapping method (data carrier modulation method) in each hierarchical transmission parameter for each current information / next information. When this parameter is "000", it indicates that the modulation method is DQPSK. When this parameter is "001", it indicates that the modulation method is QPSK. When this parameter is "010", it indicates that the modulation method is 16QAM. When this parameter is "011", it indicates that the modulation method is 64QAM. When this parameter is "100", it indicates that the modulation method is 256QAM. When this parameter is "101", it indicates that the modulation method is 1024QAM. When this parameter is "110", it indicates that the modulation method is 4096QAM. When there is no unused hierarchical layer or next information, this parameter is set to "111".

[0137] The coding rate, time interleaving length, and other settings 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 in 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 of the frequency conversion process identification. The frequency conversion process identification is set to "0" when the conversion unit 201T or the conversion unit 201L in FIG. 2A performs a frequency conversion process (in the case of a dual-polarized transmission method) or a frequency conversion amplification process (in the case of a hierarchical division multiplexing transmission method) described later. When the frequency conversion process or the frequency conversion amplification process is not performed, the frequency conversion process identification is set to "1". For example, this parameter may be configured to be set to "1" when transmitted from a broadcast station, and to be rewritten to "0" in the conversion unit 201T or the conversion unit 201L when the frequency conversion process or the frequency conversion amplification process is performed in the conversion unit 201T or the conversion unit 201L. In this way, when the second tuner / demodulation unit 130T or the third tuner / demodulation unit 130L of the broadcast receiving device 100 receives the OFDM transmission wave, if the bit of the frequency conversion process identification is "0", it is possible to identify that the frequency conversion process or the like was performed after the OFDM transmission wave was transmitted from the broadcast station.

[0139] In the dual-polarized terrestrial digital broadcasting according to the present embodiment, the frequency conversion process identification bit may be set or rewritten for each of the multiple polarized waves. For example, if both of the multiple polarized waves are not frequency-converted by the conversion unit 201T in FIG. 2A, the frequency conversion process identification bit included in both OFDM transmission waves may be left as "1". If only one of the multiple polarized waves is frequency-converted by the conversion unit 201T, the frequency conversion process identification bit included in the OFDM transmission wave of the frequency-converted polarization may be rewritten to "0" in the conversion unit 201T. If both of the multiple polarized waves are frequency-converted by the conversion unit 201T, the frequency conversion process identification bit included in the OFDM transmission wave of both of the frequency-converted polarization may be rewritten to "0" in the conversion unit 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 the frequency conversion process identification bit is not defined in the current terrestrial digital broadcasting, it will be ignored by terrestrial digital broadcasting receiving devices already used by users. However, the 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 the 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" in advance when sent from a broadcasting station, on the assumption that the OFDM transmission wave is subjected to frequency conversion processing or frequency conversion amplification processing in the conversion unit 201T or conversion unit 201L in Fig. 2A. If the received broadcast wave 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 of the physical channel number identification. The physical channel number identification is composed of a 6-bit code and identifies the physical channel number (13 to 52ch) 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 the current terrestrial digital broadcasting, and the current terrestrial digital broadcasting receiving device cannot obtain the physical channel number of the broadcast wave specified by the broadcast station from the TMCC signal, AC signal, etc. In the broadcast receiving device 100 according to the embodiment of the present invention, the physical channel number set by the broadcast station for the OFDM transmission wave can be grasped by using the physical channel number identification bits of the received OFDM transmission wave without demodulating carriers other than the TMCC signal and AC signal. The physical channels 13ch to 52ch are pre-allocated to the frequency band of 470 to 710MHz with a bandwidth of 6MHz per channel. Therefore, the fact that broadcast receiving device 100 can determine the physical channel number of an 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 polarized terrestrial digital broadcasting according to the present embodiment, in the generation process of the OFDM transmission wave on the broadcasting station side, the physical channel number identification bit is placed on each of a plurality of pairs of polarized waves in a bandwidth that originally constitutes one physical channel, and the same physical number is assigned to each pair. Here, depending on the installation environment of the broadcasting receiving device 100, the conversion unit 201T in FIG. 2A may convert only the frequency of one of the plurality of polarized waves. As a result, if the frequencies of the plurality of polarized pairs are different when received by the broadcasting receiving device 100, the broadcasting receiving device cannot demodulate the advanced terrestrial digital broadcasting using both polarized waves of the polarized terrestrial digital broadcasting unless it can somehow grasp that the plurality of polarized waves with different frequencies were originally a pair. Even in such a case, if the above-mentioned physical channel number identification bit is used, when transmission waves with the same value of the physical channel number identification bit exist at a plurality of different frequencies in the broadcasting receiving device 100, the broadcasting 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 indicate the same value.

[0144] An example of bit allocation for the main signal identification is shown in Fig. 5H. In this example, the bit for the main signal identification is allocated to bit B117.

[0145] If the OFDM transmission wave is a dual-polarized terrestrial digital broadcasting transmission wave, this parameter is set to "1" in the TMCC information of the transmission wave transmitted with the primary polarization. It is set to "0" in the TMCC information of the transmission wave transmitted with the secondary polarization. Note that a transmission wave transmitted with the primary polarization refers to a polarized signal, either a vertically polarized signal or a horizontally polarized signal, that has the same polarization direction as that used for the transmission of the current terrestrial digital broadcasting service. That is, 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 receiving the transmission wave of the dual-polarized terrestrial digital broadcasting according to the embodiment of the present invention, it is possible to use the main signal identification bit to identify whether the received transmission wave was transmitted in the main polarization or in the secondary polarization at the time of transmission. For example, by using the process of identifying the main polarization and the secondary polarization, it is possible to perform an initial scan of the transmission wave transmitted in the main polarization first during the initial scan described below, and after the initial scan of the transmission wave transmitted in the main polarization is completed, to perform an initial scan of the transmission wave transmitted in the secondary polarization.

[0147] A detailed configuration example of the hierarchical layers and segments of the dual-polarized terrestrial digital broadcasting according to this embodiment and the digital broadcasting service to be transmitted will be described later, but when a current terrestrial digital broadcasting service is transmitted using a hierarchical layer composed of segments included only in the primary polarization and an advanced terrestrial digital broadcasting service is transmitted using a hierarchical layer including segments included in both the primary polarization and the secondary polarization, an initial scan of the transmission wave transmitted in the primary polarization may be performed first to complete the initial scan of the current terrestrial digital broadcasting service, and then an initial scan of the transmission wave transmitted in the secondary polarization may be performed to perform an initial scan of the advanced terrestrial digital broadcasting service. In this way, an initial scan of the advanced terrestrial digital broadcasting service can be performed after the completion of the initial scan of the current terrestrial digital broadcasting service, and the settings obtained by the initial scan of the current terrestrial digital broadcasting service can be reflected in the settings obtained by the initial scan of the advanced terrestrial digital broadcasting service, which is preferable. In addition, the definition of the meaning of the main signal identification bits "1" and "0" may be reversed from that explained above.

[0148] Also, instead of the main signal identification bit, a polarization direction identification bit may be used as one parameter of the TMCC information. Specifically, the polarization direction identification bit may be set to "1" on the broadcasting station side for a transmission wave transmitted by horizontal polarization, and set to "0" on the broadcasting station side for a transmission wave transmitted by vertical polarization. In the broadcasting receiving device 100 that receives a transmission wave of a dual-polarized terrestrial digital broadcasting according to the embodiment of the present invention, the polarization direction identification bit may be used to identify the polarization direction in which the transmission wave being received was transmitted. For example, by using the polarization direction identification process, it becomes possible to perform an initial scan of a transmission wave transmitted by horizontal polarization first during an initial scan described later, and then perform an initial scan of a transmission wave transmitted by vertical polarization after the initial scan of the transmission wave transmitted by horizontal polarization is completed. The effect of this processing can be explained by replacing "primary polarization" with "horizontal polarization" and "secondary polarization" with "vertical polarization" in the 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 the polarization direction identification bits "1" and "0" may be reversed from those explained above.

[0150] Also, instead of the above-mentioned main signal identification bit, the first signal / second signal identification bit may be used as one parameter of the TMCC information. Specifically, one of the horizontally polarized wave and the vertically polarized wave may be defined as the first polarization, the broadcast signal of the transmission wave transmitted in the first polarization may be defined as the first signal, and the first signal / second signal identification bit may be set to "1" on the broadcast station side. Also, the other polarization may be defined as the second polarization, the broadcast signal of the transmission wave transmitted in the second polarization may be defined as the second signal, and the first signal / second signal identification bit may be set to "0" on the broadcast station side. In the broadcast receiving device 100 that receives the transmission wave of the dual-polarized terrestrial digital broadcasting according to the embodiment of the present invention, the first signal / second signal identification bit may be used to identify in which polarization direction the transmission wave being received was transmitted at the time of transmission. Note that this first signal second signal identification bit simply changes the concepts of "primary polarization" and "secondary polarization" from the definition of the main signal identification bit described above to "first polarization" and "secondary polarization", and the processing and effects in broadcast receiving device 100 can be understood by simply replacing "primary polarization" with "first polarization" and "secondary polarization" with "secondary 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 meanings of "1" and "0" in the first and second signal identification bits may be reversed from those explained above.

[0152] Next, in the transmission wave of the hierarchical division multiplexing terrestrial digital broadcasting according to this embodiment, the upper and lower layer identification bits may be used as one parameter of the TMCC information instead of the main signal identification bit described above. Specifically, in the TMCC information of the modulated wave transmitted in the upper layer, the upper and lower layer identification bits may be set to "1", and in the TMCC information of the transmission wave transmitted in the lower layer, the upper and lower layer identification bits may be set to "0". Also, if the broadcast wave to be 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 the present embodiment, in the generation process of the OFDM transmission wave on the broadcasting station side, the conversion unit 201L in FIG. 2A may perform frequency conversion and signal amplification for the lower layer of the multiple modulated waves originally transmitted in the upper and lower layers of one physical channel, depending on the installation environment of the broadcast receiving device 100. When the broadcast receiving device 100 receives a transmission wave of the hierarchical division multiplexing terrestrial digital broadcasting, it is possible to identify whether the modulated wave was originally transmitted in the upper layer or the lower layer based on the above-mentioned upper and lower layer identification bits. For example, this identification process makes it possible to perform an initial scan of an advanced terrestrial digital broadcasting service transmitted in the lower layer after the completion of an initial scan of a current terrestrial digital broadcasting service transmitted in the upper layer, and it becomes possible to reflect the setting by the initial scan of the current terrestrial digital broadcasting service in the setting by the initial scan of the advanced terrestrial digital broadcasting service. Moreover, in the third tuner / demodulation unit 130L of the broadcast receiving device 100, the discrimination 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-polarized transmission system in each embodiment, unless otherwise specified, an example will be described in which the horizontal polarization is the primary polarization and the vertical polarization is the secondary polarization. However, the primary and secondary relationship between the horizontal polarization and the vertical polarization may be reversed. FIG. 5I shows an example of bit allocation for 4K signal transmission hierarchy identification.

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

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

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

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

[0159] It should be noted that the definitions of the bits "0" and "1" of the 4K signal transmission hierarchy identification described above may be reversed.

[0160] An example of bit allocation of the additional layer transmission identification is shown in Fig. 5J. The additional layer transmission identification bit may indicate whether the broadcast wave to be transmitted is the dual-polarized terrestrial digital broadcasting service of this embodiment, and whether the layers B and C of the transmission wave transmitted by the secondary polarization are used as virtual layers D and E, respectively.

[0161] For example, in the example shown in the figure, the bit placed in B120 is the hierarchical layer D transmission identification bit, and when this parameter is "0", hierarchical layer B transmitted with the secondary polarization is used as virtual hierarchical layer D. 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 hierarchical layer B transmitted with the primary polarization are treated as hierarchical layer D, which is a different layer from hierarchical layer B transmitted with the primary polarization. When this parameter is "1", hierarchical layer B transmitted with the secondary polarization is not used as virtual hierarchical layer D, but is used as hierarchical layer B.

[0162] Also, for example, the bit placed in B121 is the hierarchical layer E transmission identification bit, and when this parameter is "0", hierarchical layer C transmitted with the secondary polarization is used as virtual hierarchical 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 hierarchical layer C transmitted with the primary polarization is treated as hierarchical layer E, which is a different layer from hierarchical layer C transmitted with the primary polarization. When this parameter is "1", hierarchical layer C transmitted with the secondary polarization is not used as virtual hierarchical layer E, but is used as hierarchical 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 the current terrestrial digital broadcasting.

[0164] If this parameter is "0", it is possible to make the parameters such as the carrier modulation mapping method, coding rate, and time interleaving length shown in Fig. 5C different between virtual layer D / virtual layer E and layers B / C. In this case, if current / next information of 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 grasp 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 bit of the additional layer transmission identification (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 in the secondary polarization may be switched to the transmission parameters of the virtual layer D and / or virtual layer E. In this case, when the virtual layer D and / or virtual layer E are used, layers A, B, and C are used in the primary polarization, and the transmission parameters of these layers may be transmitted in the current information / next information of the TMCC information transmitted in the primary polarization. In addition, layers A, D, and E are used in the secondary polarization, and the transmission parameters of these layers may be transmitted in the current information / next information of the TMCC information transmitted in the secondary polarization. Even in this case, the broadcast receiving device 100 can grasp parameters such as the carrier modulation mapping method, convolutional coding rate, and time interleaving length related to the virtual layer D / virtual layer E.

[0166] In addition, if the broadcast wave to be transmitted is not an advanced terrestrial digital broadcasting service, or if the advanced terrestrial digital broadcasting service uses a hierarchical division multiplexing transmission method, these parameters may be configured to be set to "1".

[0167] In addition, the parameters for the 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 that explained above.

[0169] In addition, when 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 D layer transmission identification bit indicates that layer B is to be used as the virtual D layer, the broadcast receiving device 100 may be configured to ignore the D layer transmission identification bit. Similarly, when the above-mentioned 4K signal transmission layer identification parameter indicates that a 4K broadcast program is to be transmitted on layer C, even if the E layer transmission identification bit indicates that layer C is to be used as the virtual E layer, the broadcast receiving device 100 may be configured to ignore the E layer transmission identification bit. By clarifying the priority order of the bits used in the judgment process in this way, it is possible to prevent conflicts in the judgment process in the broadcast receiving device 100.

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

[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] Here, in the current terrestrial digital broadcasting system of 2K broadcasting, an identification bit that transmits a coding rate dedicated to "convolutional code" is transmitted. However, in the digital broadcasting according to the present embodiment, the advanced terrestrial digital broadcasting service of 4K broadcasting can be broadcasted together with the terrestrial digital broadcasting service of 2K broadcasting. And, as already explained, in the advanced terrestrial digital broadcasting service of 4K broadcasting, the LDPC code can be used as the inner code.

[0173] Therefore, unlike the current 2K terrestrial digital broadcasting system, the error correction coding rate identification bits in this embodiment shown in FIG. 5K are configured to be compatible with LDPC codes instead of coding rate identification bits dedicated to convolutional codes.

[0174] Here, whether the inner code of the target terrestrial digital broadcasting service is a convolutional code or an LDPC code, the number of bits is saved by using the bits arranged in a common range as the identification bits for the coding rate transmission. Furthermore, even if the identification bits are the same, by setting the coding rate independently for the case where the inner code of the target terrestrial digital broadcasting service is a convolutional code and the case where the inner code is an LDPC code, the digital broadcasting system can adopt a selection group of coding rates suitable for each coding method.

[0175] Specifically, in the example of FIG. 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, and that the coding rate is 14 / 16 if it is an LDPC code. If there is no unused layer or next information, this parameter is set to "111".

[0176] In addition, 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. The identification may 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, it is sufficient to identify the inner code as a convolutional code. Also, if the target terrestrial digital broadcasting service is an advanced terrestrial digital broadcasting service, it is sufficient to identify the inner code as an LDPC code.

[0177] As another example of identifying whether the inner code of the target digital terrestrial broadcasting service is a convolutional code or an LDPC code, the identification may be made based on an identification bit of an error correction method, which will be described later with reference to FIG. 6I.

[0178] According to the error correction coding rate identification bits shown in FIG. 5K 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] In addition, in an advanced terrestrial digital broadcasting service using a dual-polarized transmission method, the TMCC information of a transmission wave transmitted with horizontal polarization and the TMCC information of a transmission wave transmitted with vertical polarization may be the same or different. Similarly, in an advanced terrestrial digital broadcasting service using a hierarchical division multiplexing transmission method, 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. In addition, 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 with a secondary polarization or a transmission wave transmitted in a lower layer.

[0180] In the above description, an example has been described in which the frequency conversion process identification parameter, the main signal identification parameter, the polarization direction identification parameter, the first signal / second signal identification parameter, the upper and lower layer identification parameter, the 4K signal transmission layer identification parameter, and the additional layer transmission identification parameter are included in a TMCC signal (TMCC carrier) and transmitted. However, these parameters may also be included in an AC signal (AC carrier) and transmitted. That is, these parameters may be transmitted by a carrier (such as a TMCC carrier or AC carrier) that is modulated by a modulation method that performs mapping with a smaller number of 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 motion warning information. The earthquake motion warning information is transmitted using the AC carrier of segment 0. On the other hand, the additional information related to the transmission control of modulated waves can be transmitted using any AC carrier. FIG. 6A shows an example of bit allocation of an AC signal. The AC signal is composed of 204 bits (B0 to B203). B0 is a demodulation reference signal for the AC symbol, and has a predetermined amplitude and phase reference. 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 motion warning information.

[0182] FIG. 6B shows an example of bit allocation for identifying the configuration of the AC signal. When transmitting earthquake motion warning information using B4 to B203 of the AC signal, this parameter is set to "001" or "110". The parameter for identifying the configuration when transmitting earthquake motion warning information ("001" or "110") is the same code as the first three bits (B1 to B3) of the synchronization signal of the TMCC signal, and is sent alternately for each frame at the same timing as the TMCC signal. Also, when this parameter has a value other than the above, it indicates that additional information related to the transmission control of the modulated wave is transmitted using B4 to B203 of the AC signal. Additional information related to the transmission control of the modulated wave may be transmitted using B4 to B203 of the AC signal. In this case, the parameter for identifying the configuration of the AC signal is sent alternately between "000" and "111", or "010" and "101", or "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 motion warning information.

[0184] The transmission of the additional information related to the transmission control of the modulated wave may be performed by 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 the additional information related to the transmission control of the modulated wave of the AC signal instead of or in addition to the TMCC signal. In this way, the broadcast receiving device 100 can perform various identification processes already described in the description of the TMCC signal using these parameters. In addition, the transmission parameter additional information related to the transmission layer of the 4K broadcast program when any parameter of the 4K signal transmission layer identification is "0", or the current / next information of the transmission parameters related to the virtual D layer / virtual E layer when any parameter of the additional layer transmission identification is "0" may be allocated. 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] The earthquake motion warning information may be transmitted according to the bit allocation shown in FIG. 6C. The earthquake motion warning information is composed of a synchronization signal, a start / end flag, an update flag, a signal identification, earthquake motion warning detail information, CRC, a parity bit, and the like. 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. When the configuration identification of the AC signal indicates that earthquake motion warning information is to be transmitted, the 16-bit code combining the configuration identification and the synchronization signal becomes a 16-bit synchronization word that is the same as the synchronization signal of the TMCC. The start / end flag is composed of a 2-bit code as a flag for the start timing / end timing of the earthquake motion warning information. The start / end flag is changed from "11" to "00" at the start of transmission of the earthquake motion warning information, and is changed from "00" to "11" at the end of transmission of the earthquake motion warning information. The update flag is composed of a 2-bit code, and 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", the initial value is "00" and is incremented by "1". After "11", it returns to "00". If the start / end flag is "11", the update flag will also be "11".

[0186] FIG. 6D shows an example of bit allocation for signal identification. 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 (relevant area exists)". When this parameter is "001", it means "earthquake motion warning detail information (no relevant area)". When this parameter is "010", it means "test signal for earthquake motion warning detail information (relevant area exists)". When this parameter is "011", it means "test signal for earthquake motion warning detail information (no relevant area)". When this parameter is "111", it means "no earthquake motion warning detail information". 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 is composed of an 88-bit code. When the signal identification is "000", "001", "010", or "011", the earthquake motion warning detail information transmits information on the current time when the earthquake motion warning information is sent, information indicating the area that is the subject of the earthquake motion warning, and information such as the latitude / longitude / seismic intensity of the epicenter of the earthquake that is the subject of the earthquake motion warning. An example of bit allocation of the earthquake motion warning detail information when the signal identification is "000", "001", "010", or "011" is shown in Figure 6E. Also, when the signal identification is "111", it is possible to transmit a code for identifying a broadcasting company using the bits of the earthquake motion warning detail information. An example of bit allocation of the earthquake motion warning detail information when the signal identification is "111" is shown in Figure 6F.

[0188] The CRC is a code generated by 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] In the broadcast receiving device 100, it is possible to perform various controls for dealing 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 for presenting information related to the earthquake motion warning, control for switching low-priority display content to a display related to the earthquake motion warning, control for terminating the display of an application and switching to a display related to the earthquake motion warning or broadcast program video, and the like.

[0190] FIG. 6G shows an example of bit allocation of additional information related to transmission control of modulated waves. The additional information related to transmission control of modulated waves 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. When the configuration identification of the AC signal indicates that additional information related to transmission control of modulated waves is transmitted, the 16-bit code combining the configuration identification and the synchronization signal becomes a 16-bit synchronization word conforming to the synchronization signal of TMCC. The current information indicates the current information of the transmission parameter additional information when transmitting a 4K broadcast program on the B or C layer, and the transmission parameters related to the virtual D or E layer. The next information indicates the transmission parameter additional information when transmitting a 4K broadcast program on the B or C layer, and the transmission parameters related to the virtual D or E layer after switching.

[0191] In the example of FIG. 6G, B18 to B30 of the current information are current information of the B layer transmission parameter additional information, and indicate the current information of the transmission parameter additional information when transmitting a 4K broadcast program on the B layer. Moreover, B31 to B43 of the current information are current information of the C layer transmission parameter additional information, and indicate the current information of the transmission parameter additional information when transmitting a 4K broadcast program on the C layer. Moreover, B70 to B82 of the next information are information after switching of the transmission parameters of the B layer transmission parameter additional information, and indicate the information after switching of the transmission parameters of the transmission parameter additional information when transmitting a 4K broadcast program on the B layer. Moreover, B83 to B95 of the next information are information after switching of the transmission parameters of the C layer transmission parameter additional information, and indicate the information after switching of the transmission parameters of the transmission parameter additional information when transmitting a 4K broadcast program on the C layer. Here, the transmission parameter additional information is a transmission parameter related to modulation that is added to the transmission parameters of the TMCC information shown in FIG. 5C to expand the specifications. The specific contents 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. Since the TMCC information in Fig. 5B needs to maintain compatibility with current terrestrial digital broadcasting, it is not easy to increase the number of bits. 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, instead of the TMCC information.

[0194] This makes it possible to transmit to the receiving device modulation information for the new virtual hierarchical layers D and E while maintaining compatibility of the TMCC information with the current terrestrial digital broadcasting. This makes it possible, when the hierarchical layers B / C of the transmission wave transmitted in the secondary polarization of the broadcast wave of the dual-polarized terrestrial digital broadcasting service according to this embodiment are used as the virtual hierarchical layers D / E, to set the transmission parameters of the virtual hierarchical layers D / E of the transmission wave transmitted in the secondary polarization differently from the transmission parameters of the hierarchical layers B / C of the transmission wave transmitted in the primary polarization.

[0195] Note that, when the virtual D layer or virtual E layer is not used, the transmission parameter information for the unused layers can be ignored by broadcast receiving device 100. For example, when the additional layer transmission identification parameter in the TMCC information in Fig. 5J for the virtual D layer or virtual E layer indicates "1" (indicating that the virtual D layer / virtual E layer is not used), broadcast receiving device 100 can be configured to ignore any value entered in the transmission parameter shown in Fig. 6G for the unused virtual D layer or virtual E layer.

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

[0197] A specific example of the transmission parameter additional information is shown in Fig. 6H. The transmission parameter additional information can include parameters of an error correction method, parameters of a constellation format, and the like.

[0198] The error correction method indicates the setting of what coding method is 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 layer C. Figure 6I shows an example of bit allocation for the error correction method. When this parameter is "000", a convolutional code is used as the inner code and a shortened RS code is used as the outer code when transmitting 4K broadcast programs on layer B or layer C. When this parameter is "001", an LDPC code is used as the inner code and a BCH code is used as the outer code when transmitting 4K broadcast programs on layers B and C. Other combinations may also be set and selected.

[0199] In addition, when transmitting a 4K broadcast program in the B and C layers, it is possible to adopt not only a uniform constellation but also a non-uniform constellation (NUC) as the carrier modulation mapping method. FIG. 6J shows an example of bit allocation of the constellation format. When this parameter is "000", the carrier modulation mapping method selected by the transmission parameters of the TMCC information is applied in a uniform constellation. When this parameter is any of "001" to "111", the carrier modulation mapping method selected by the transmission parameters of the TMCC information is applied in a non-uniform constellation. When applying a non-uniform constellation, the optimal value of the non-uniform constellation differs depending on the type of error correction method and its coding rate. Therefore, when the parameter of the constellation format is any of "001" to "111", the broadcast receiving device 100 of this embodiment may determine the non-uniform constellation to be used in the demodulation process based on the parameters of the carrier modulation mapping method, the parameters of the error correction method, and the parameters of the 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 for advanced terrestrial digital broadcasting services 1] In order to realize 4K (3840 pixels horizontal × 2160 pixels vertical) broadcasting while maintaining the viewing environment of the current terrestrial digital broadcasting service, a dual-polarized transmission method will be described as an example of a transmission method for advanced terrestrial digital broadcasting services according to an embodiment of the present invention. The dual-polarized transmission method according to an embodiment of the present invention is a method that shares some specifications with the current terrestrial digital broadcasting method. For example, 13 segments within a band of about 6 MHz equivalent to one physical channel are divided, and seven segments are assigned to the transmission of 2K (1920 pixels horizontal × 1080 pixels vertical) broadcast programs, five segments to the transmission of 4K broadcast programs, and one segment 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, and a transmission capacity of a total of 10 segments is secured by MIMO (Multiple-Input Multiple-Output) technology. In addition, 2K broadcast programs maintain image quality by optimizing the latest MPEG-2 Video compression technology, etc., so that they can be received by 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. In addition, the number of segments assigned to each broadcast may differ from the above.

[0201] FIG. 7A shows an example of a dual-polarized transmission system in 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 the 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 a horizontally polarized signal and a vertically polarized signal are used within one physical channel.

[0202] FIG. 7A shows two examples of allocation of 13 segments, (1) and (2). In the example (1), a 2K broadcast program is transmitted using segments 1 to 7 (layer B) of the horizontally polarized signal. A 4K broadcast program is transmitted using a total of 10 segments, segments 8 to 12 (layer C) of the horizontally polarized signal and segments 8 to 12 (layer C) of the vertically polarized signal. Segments 1 to 7 (layer B) of the vertically polarized signal may be used to transmit the same broadcast program as 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 a broadcast program different 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 on how to use segments 1 to 7 (layer B) of the vertically polarized signal can be transmitted to the receiving device side using the already-described TMCC signal 4K signal transmission layer identification parameter, additional layer transmission identification parameter, etc. 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 both horizontally and vertically polarized signals may be simulcasts that transmit broadcast programs of the same content at different resolutions, or may transmit broadcast programs of different content. Segment 0 of both horizontally and vertically polarized signals transmits the same One Seg broadcast program.

[0203] The example of (2) in FIG. 7A is a modified example different from (1). In the example of (2), a 4K broadcast program is transmitted using a total of 10 segments, which are 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 the example of (2), segments 6 to 12 (layer C) of the vertically polarized signal may be used to transmit the same broadcast program as the 2K broadcast program transmitted by segments 6 to 12 (layer C) of the horizontally polarized signal. Segments 6 to 12 (layer C) of the vertically polarized signal may be used to transmit a broadcast program different from the 2K broadcast program transmitted by segments 6 to 12 (layer C) of the horizontally polarized signal. Segments 6 to 12 (layer C) of the vertically polarized signal may be used to transmit other data transmissions or may be unused. These identification information are also similar to those in the example of (1), so a repeated explanation will be omitted.

[0204] In both of the examples of (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 a transmitting system and a receiving system for an advanced terrestrial digital broadcasting service using a dual-polarized transmission method. The configuration of the broadcasting system for an advanced terrestrial digital broadcasting service using a dual-polarized transmission method is basically the same as the configuration of the broadcasting system shown in FIG. 1, but the radio tower 300T, which is a facility of the broadcasting station, is a dual-polarized transmitting antenna that can simultaneously transmit a horizontally polarized signal and a vertically polarized signal. In the example of FIG. 7B, only the tuning / detecting unit 131H and the tuning / detecting unit 131V of the second tuner / demodulator 130T of the broadcasting receiving device 100 are excerpted and illustrated, and other operating units are omitted.

[0206] The horizontally polarized signal sent from radio tower 300T is received by the horizontally polarized receiving element of antenna 200T, which is a dual-polarized receiving antenna, and is input from connector 100F1 to channel selection / detection unit 131H via coaxial cable 202T1. Meanwhile, the vertically polarized signal sent from radio tower 300T is received by the vertically polarized receiving element of antenna 200T, and is input from connector 100F2 to channel selection / detection unit 131V via coaxial cable 202T2. An F-type connector is generally used for the connector that connects the antenna (coaxial cable) to the television receiver.

[0207] Here, there is a possibility that the user mistakenly connects the coaxial cable 202T1 to the connector unit 100F2 and the coaxial cable 202T2 to the connector unit 100F1. In this case, there is a possibility that a malfunction such as being unable to identify whether the input broadcast signal is a horizontally polarized signal or a vertically polarized signal may occur in the channel selection / detection unit 131H and the channel selection / detection unit 131V. In order to prevent the above-mentioned malfunction, it is possible to use a connector unit with a different shape from the F-type connector of the connector unit of the coaxial cable 202T1 and the connector unit 100F1 that transmits a horizontally polarized signal, for example, one of the connector units that connect the antenna (coaxial cable) and the television receiver. Alternatively, it is only necessary to control the channel selection / detection unit 131H and the channel selection / detection unit 131V to identify whether the input broadcast signal is a horizontally polarized signal or a vertically polarized signal and operate by referring to the main signal identification of the TMCC information of each input signal.

[0208] FIG. 7C shows an example of a configuration example of a broadcasting system for advanced terrestrial digital broadcasting services using a dual-polarized transmission method according to an embodiment of the present invention, which is different from the above. The configuration shown in FIG. 7B, in which the broadcasting receiving device 100 has two connectors for inputting broadcasting signals and two coaxial cables are used to connect the antenna 200T and the broadcasting receiving device 100, may not necessarily be suitable in terms of equipment costs and handling during cable wiring. Therefore, in the configuration shown in FIG. 7C, the horizontally polarized signal received by the horizontally polarized receiving element of the antenna 200T and the vertically polarized signal received by the vertically polarized receiving element of the antenna 200T are input to a converter 201T, and the converter 201T and the broadcasting receiving device 100 are connected by a single coaxial cable 202T3. The broadcasting signal input from the connector 100F3 is split and input to the tuning / detecting unit 131H and the tuning / detecting unit 131V. The connector unit 100F3 may have the function of supplying operating power to the conversion unit 201T.

[0209] The conversion unit 201T may belong to the equipment of the environment in which the broadcast receiving device 100 is installed (for example, an apartment building, etc.). Alternatively, the conversion unit 201T may be configured as an integrated device with the antenna 200T and installed in a house, etc. The conversion unit 201T performs a frequency conversion process 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 process makes it possible to separate 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 into different frequency bands and transmit them to the broadcast receiving device 100 simultaneously through a single coaxial cable 202T3. If necessary, the frequency conversion process may be performed on both the horizontally polarized signal and the vertically polarized signal, but in this case, the frequency bands of the two signals after frequency conversion must be different from each other. In addition, the broadcast receiving device 100 may be provided with only one 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 the vertically polarized signal transmitted in the frequency band of 470-710 MHz (corresponding to UHF channels 13-52), the frequency band of the vertically polarized signal is converted from the frequency band of 470-710 MHz to the frequency band of 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 or the like. Note that frequency conversion processing may also be performed on the horizontally polarized signal.

[0211] In addition, it is preferable that the frequency conversion process is performed on the signal transmitted in the secondary polarization depending on the result of referring to the main signal identification of the TMCC information. As described with reference to Fig. 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 in the secondary polarization is frequency-converted, it is desirable to make the frequency band of the signal transmitted in the secondary polarization higher than that of the signal transmitted in the primary polarization in the converted signal. This allows the initial scan of the broadcast receiving device 100 to be performed before the initial scan of the signal transmitted in the primary polarization, by starting from the low frequency side and proceeding to the high frequency side. This makes it possible to more suitably perform a process of reflecting the settings by the initial scan of the current terrestrial digital broadcasting service in the settings 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, but may also be performed only on physical channels using signal transmission according to a dual-polarized transmission method.

[0214] The frequency band after the frequency conversion process is preferably between 710 and 1032 MHz. That is, when receiving terrestrial digital broadcasting service and BS / CS digital broadcasting service simultaneously, it is possible to mix 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 mixed signal to broadcast receiving device 100 via one coaxial cable. In this case, since the BS / CS-IF signal uses a frequency band of about 1032 to 2150 MHz, if the frequency band after the frequency conversion process is set to be between 710 and 1032 MHz, it is possible to avoid interference between the horizontally polarized signal and the vertically polarized signal, and also to avoid 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 and below) is used for television broadcast distribution by cable television stations, it is more preferable to set the frequency band after the frequency conversion process to between 770 and 1032 MHz, which is above the band equivalent to UHF channel 62.

[0215] In addition, it is preferable to set the bandwidth of the region (part a in the figure) between the frequency band before and after conversion by the frequency conversion process to be an integer multiple of the bandwidth of one physical channel (6 MHz). This has the advantage that frequency setting control is easier when, for example, the broadcast receiving device 100 performs frequency scanning of the broadcast signal of the frequency band before and after conversion by the frequency conversion process all at once.

[0216] As described above, in the dual-polarized transmission method according to the embodiment of the present invention, both horizontally polarized and vertically polarized signals are used to transmit a 4K broadcast program. Therefore, in order to correctly play back a 4K broadcast program, it is necessary for the receiving side to correctly grasp the combination of the physical channels of the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization. Even when a frequency conversion process is performed and a broadcast signal transmitted with horizontal polarization and a broadcast signal transmitted with vertical polarization for the same physical channel are input to the receiving device as signals of different frequency bands, the broadcast receiving device 100 of this embodiment can correctly grasp the combination of the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization of the same physical channel by appropriately referring to the parameters (e.g., main signal identification and physical channel number identification) of the TMCC information shown in Figures 5F to 5J. As a result, the broadcast receiving device 100 of this embodiment can appropriately receive, demodulate, and play back a 4K broadcast program.

[0217] In addition, although the examples of Figs. 7B, 7C, and 7D have all been described with reference to cases in which horizontal polarization is the main polarization, the horizontal polarization and vertical polarization may be reversed depending on the application.

[0218] As described 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 / demodulator 130T of the broadcast receiving device 100, but can also be received by the first tuner / demodulator 130C of the broadcast receiving device 100. When the terrestrial digital broadcasting waves are received by the first tuner / demodulator 130C, the broadcasting signals of the terrestrial digital broadcasting waves that are transmitted in the hierarchy of the advanced terrestrial digital broadcasting service are ignored, but the broadcasting signals that are transmitted in the hierarchy 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 sent to a CATV distribution system in the same frequency as the signal received, or the signal is converted in frequency.

[0220] The pass-through method includes (1) a method of extracting the transmission signal band and adjusting the level of each terrestrial digital broadcasting signal output from a terrestrial receiving antenna, and transmitting the signal to a CATV facility at the same frequency as the transmission signal frequency, and (2) a method of extracting the transmission signal band and adjusting the level of each terrestrial digital broadcasting signal output from a terrestrial receiving antenna, and transmitting the signal to a CATV facility at a frequency of the VHF band, MID band, SHB band, or UHF band set by the CATV facility manager. The equipment constituting the receiving amplifier for performing the signal processing of the first method, or the equipment constituting the receiving amplifier and frequency converter for performing the signal processing of the second method, is an OFDM signal processor (OFDM Signal Processor: OFDM-SP).

[0221] FIG. 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-polarized transmission method. FIG. 7E shows a cable television station's head-end facility 400C and a broadcast receiving device 100. FIG. 7F shows an example of a frequency conversion process in this case. The notation (H·V) in FIG. 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, the notation (H) indicates a broadcast signal transmitted with horizontal polarization, and the notation (V) indicates a broadcast signal transmitted with vertical polarization. The notations in the following FIG. 7H and FIG. 7I have the same meaning.

[0222] When the pass-through transmission of the first method is applied to the advanced terrestrial digital broadcasting service of the dual-polarized transmission method of the embodiment of the present invention, the broadcast signal transmitted by the horizontal polarization is subjected to signal band extraction and level adjustment in the cable television station head-end equipment 400C, and is sent out at the same frequency as the transmission signal frequency. On the other hand, the broadcast signal transmitted by the vertical polarization is subjected to signal band extraction and level adjustment in the cable television station head-end equipment 400C, and is sent out after frequency conversion processing similar to that described in FIG. 7D (processing of converting the broadcast signal transmitted by the vertical polarization to a frequency band higher than the frequency band of 470 to 770 MHz, which is the band corresponding to UHF 13ch to 62ch). This processing prevents the frequency bands of the broadcast signal transmitted by the horizontal polarization and the broadcast signal transmitted by the vertical polarization from overlapping, making it possible to transmit the signal through one 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-polarized transmission method. Fig. 7G shows a cable television station's head-end equipment 400C and a broadcast receiving device 100. Fig. 7H shows an example of the frequency conversion process in this case.

[0224] When the pass-through transmission of the second method is applied to the advanced terrestrial digital broadcasting service of the dual-polarized transmission method of the embodiment of the present invention, the broadcast signal transmitted by the horizontal polarization is subjected to signal band extraction and level adjustment in the cable television station head-end equipment 400C, and is then sent out after frequency conversion processing to a frequency set by the CATV facility manager. On the other hand, the broadcast signal transmitted by the vertical polarization is subjected to signal band extraction and level adjustment in the cable television station head-end equipment 400C, and is then sent out after frequency conversion processing similar to that described in FIG. 7D (processing of converting the broadcast signal transmitted by the vertical polarization to a frequency band higher than the frequency band of 470 to 770 MHz, which is the frequency band of UHF 13ch to 62ch). The frequency conversion processing shown in FIG. 7H is different from that in FIG. 7F, in that the broadcast signal transmitted by the horizontal polarization is not limited to the frequency band of 470 to 770 MHz, which is the frequency band of UHF 13ch to 62ch, but is expanded to a lower frequency band and rearranged in the range of 90 to 770 MHz. This process prevents the frequency bands of the broadcast signals transmitted with horizontal polarization and those transmitted with vertical polarization from overlapping, making it possible to transmit signals using a single coaxial cable (or optical fiber cable). The transmitted signals can be received by the broadcast receiving device 100 of this embodiment. The process of receiving and demodulating the broadcast signals transmitted with horizontal polarization and those transmitted with vertical polarization contained in the signal in the broadcast receiving device 100 of this embodiment is the same as that described in Fig. 7D, and therefore will not be described again.

[0225] As another modification of the frequency conversion process of the head-end equipment 400C of the cable television station 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, the signal band extraction and level adjustment may be performed on both the broadcast signal transmitted by the horizontal polarization and the broadcast signal transmitted by the vertical polarization, and the frequency conversion process to the frequency set by the CATV facility manager may be performed before transmission. In the example of FIG. 7I, the frequency conversion is performed so that both the broadcast signal transmitted by the horizontal polarization and the broadcast signal transmitted by the vertical polarization are rearranged in the range of 90 to 770 MHz (range of VHF1ch to UHF62ch), and the frequency band beyond UHF62ch is not used, so the frequency band utilization efficiency of the broadcast signal is higher than that of FIG. 7H.

[0226] In addition, since the band in which the broadcast signals are rearranged is wider than the frequency band of 470 to 710 MHz, which is the band of UHF 13ch to 52ch during antenna reception, it is also possible to alternately rearrange the broadcast signals transmitted with horizontal polarization and the 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, which were on the same physical channel during antenna reception, are rearranged alternately in the order of physical channels during antenna reception, when the broadcast receiving device 100 of this embodiment performs an initial scan from the low frequency side, the pairs of broadcast signals transmitted with horizontal polarization and broadcast signals transmitted with vertical polarization, which were originally on the same physical channel, can be initialized in order in units of the originally same physical channel, and the initial scan can be performed efficiently.

[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 / demodulator 130T of the broadcast receiving device 100, but can also be received by the first tuner / demodulator 130C of the broadcast receiving device 100. When the terrestrial digital broadcasting waves are received by the first tuner / demodulator 130C, the broadcasting signals of the terrestrial digital broadcasting waves that are transmitted in the hierarchy of the advanced terrestrial digital broadcasting service are ignored, but the broadcasting signals that are transmitted in the hierarchy of the current terrestrial digital broadcasting service are played back.

[0229] [Transmission method for advanced terrestrial digital broadcasting services 2] 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 that is different from the above. The hierarchical division multiplexing transmission method according to an embodiment of the present invention is a method that shares some specifications with the current terrestrial digital broadcasting method. For example, the broadcast waves of a 4K broadcasting service, which has a low signal level, are multiplexed and transmitted on the same channel as the broadcast waves of a current 2K broadcasting service. Note that the reception level of the 4K broadcasting is suppressed to a required C / N or less, and the 2K broadcasting is received as usual. For 4K broadcasting, the transmission capacity is expanded by modulation multi-value, etc., and the 2K broadcasting waves are canceled using a reception technology compatible with LDM (hierarchical division multiplexing) technology, and reception is performed with the remaining 4K broadcasting waves.

[0230] FIG. 8A shows an example of a hierarchical division multiplexing transmission method in an advanced terrestrial digital broadcasting service according to an embodiment of the present invention. The upper layer is composed of modulated waves of the current 2K broadcasting, and the lower layer is composed of modulated waves of the 4K broadcasting. The upper layer and the lower layer are multiplexed and output as a composite wave in the same frequency band. For example, the upper layer may use 64QAM or the like as a modulation method, and the lower layer may use 256QAM or the like as a modulation method. Note that the 2K broadcast program transmitted using the upper layer and the 4K broadcast program transmitted using the lower layer may be simulcasts that transmit broadcast programs of the same content at different resolutions, or may transmit broadcast programs of different content. Here, the upper layer is transmitted with high power, and the lower layer is transmitted with 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 levels (difference in power).

[0231] Fig. 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, but the radio tower 300L, which is a facility of the broadcasting station, is a transmitting antenna that transmits a broadcasting signal in which 2K broadcasting in an upper layer and 4K broadcasting in a lower layer are multiplexed. 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 excerpted and illustrated, 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, when 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 the long coaxial cable 202L, the broadcast signal may be attenuated, and the channel selection / detection unit 131L may not be able to properly receive the 4K broadcast wave, particularly in the lower hierarchical layers.

[0233] Therefore, in order to prevent the above-mentioned problems, the conversion unit 201L performs a frequency conversion and amplification process on the 4K broadcast signal of the lower layer. The frequency conversion and amplification process converts the frequency band of the 4K broadcast signal of the lower layer from a frequency band of 470 to 710 MHz (a band corresponding to UHF ch13 to ch52) to, for example, a frequency band of 770 to 1010 MHz, which exceeds the band corresponding to UHF ch62. Furthermore, a process is performed to amplify the 4K broadcast signal of the lower layer to a signal level at which the influence of attenuation in the cable is not a problem. By performing such a process, it is possible to avoid the influence of attenuation of the broadcast signal during transmission through the coaxial cable while avoiding interference between the 2K broadcast signal and the 4K broadcast signal. Note that when the influence of attenuation is not a problem, such as when the length of the coaxial cable 202L is short, the conversion unit 201L and the frequency conversion and amplification process may be unnecessary.

[0234] In addition, the frequency band after conversion by the frequency conversion amplification process is preferably between 710 and 1032 MHz, which exceeds the band corresponding to UHF ch 52, or between 770 and 1032 MHz, which exceeds the band corresponding to UHF ch 62 (in the case of retransmission by a cable television station, etc.), the bandwidth of the area between the frequency band before conversion by the frequency conversion amplification process and the frequency band after conversion is preferably 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 similar to the explanation of this embodiment related to frequency conversion already explained, so repeated explanation will be omitted.

[0235] The broadcast receiving device 100 of this embodiment can identify whether the received broadcast signal is a broadcast signal transmitted in 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 identify whether the received broadcast signal is a broadcast signal that has been frequency converted after antenna reception by using the frequency conversion processing identification bit of the TMCC information described in FIG. 5F. The broadcast receiving device 100 of this embodiment can identify whether the received broadcast signal transmits a 4K program in a lower layer by using the 4K signal transmission layer identification bit of the TMCC information described in FIG. 5I. These identification processes can be performed by demodulating the data carrier and referring to the control information included in the stream, but demodulation of the data carrier is required, which makes the process complicated. Since the identification process is simpler and faster by referring to the parameters of the TMCC information described above, it is possible to speed up the initial scan of the broadcast receiving device 100, for example.

[0236] As already explained, the channel selection / 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 (hierarchical 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 described 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 / demodulator 130L of the broadcast receiving device 100, but can also be received by the first tuner / demodulator 130C of the broadcast receiving device 100. When the terrestrial digital broadcasting waves are received by the first tuner / demodulator 130C, the broadcasting 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 broadcasting 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 adopted in the current terrestrial digital broadcasting service, etc., as a media transport method for transmitting data such as video and audio. Specifically, the method of the stream transmitted by the OFDM transmission wave in FIG. 4D(1) is MPEG-2 TS, and the method of the stream transmitted in the hierarchical layer in which the current terrestrial digital broadcasting service is transmitted among the OFDM transmission waves in FIG. 4D(2) and FIG. 4D(3) is MPEG-2 TS. Moreover, the method of the stream obtained by demodulating the transmission wave in the first tuner / demodulator 130C of the broadcast receiving device 100 in FIG. 2 is MPEG-2 TS. Moreover, the method of the stream corresponding to the hierarchical layer in which the current terrestrial digital broadcasting service is transmitted among the stream obtained by demodulating the transmission wave in the second tuner / demodulator 130T 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 hierarchical level at 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 one packet stream. As the clock is also treated as one packet stream, it is suitable for transmitting one piece of content over one transmission path with guaranteed transmission quality, and is therefore adopted in many current digital broadcasting systems. In addition, it is possible to realize two-way communication via two-way networks such as fixed and mobile networks, and it is compatible with broadcasting and communication linkage systems that link digital broadcasting services with functions that utilize broadband networks, and combine digital broadcasting services with acquisition of additional content via broadband networks, arithmetic processing in server devices, and presentation processing in linkage with mobile terminal devices.

[0240] An example of a protocol stack for a transmission signal in a broadcasting system using MPEG-2 TS is shown in Fig. 9A. 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 mainly 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 sequence information> 9B shows a list of tables used in the program sequence information of the MPEG-2 TS broadcasting system. In this embodiment, the following tables are used as the program sequence information.

[0243] (1) PAT (Program Association Table) (2)CAT(Conditional Access Table) (3) Program Map Table (PMT) (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) Time and Date Table (TDT) (10) Time Offset Table (TOT)

[0244] (11)LIT(Local Event Information Table) (12) Event Relation Table (ERT) (13)ITT(Index Transmission Table) (14)PCAT(Partial Content Announcement Table) (15) ST (Stuffing Table) (16)BIT(Broadcaster Information Table) (17)NBIT(Network Board Information Table) (18)LDT(Linked Description Table) (19) AMT (Address Map Table) (20)INT(IP / MAC Notification Table) (21) Tables set by operators

[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) Common Data Table (CDT) (9) DSM-CC Section (10)AIT(Application Information Table) (11)DCM(Download Control Message) (12)DMM(Download Management Message) (13) Tables set by operators

[0247] <Descriptors used in program service information> 9D, 9E, and 9F show a list of descriptors used in program service information of the 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 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) Descriptor set by the operator

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

[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 an MPEG-2 TS-based broadcast system. In this embodiment, the following descriptors are used as 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 the 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 carriers

[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 in FIG. 4D(2) and FIG. 4D(3), the method of the stream transmitted in the layer in which the advanced terrestrial digital broadcasting service is transmitted is the MMT method in principle. Also, among the streams obtained by demodulating the transmission wave in the second tuner / demodulator 130T of the broadcast receiving device 100 in FIG. 2, the method of the stream corresponding to the layer in which the advanced terrestrial digital broadcasting service is transmitted is the MMT method in principle. Similarly, among the streams obtained by demodulating the transmission wave in the third tuner / demodulator 130L, the method of the stream corresponding to the layer in which the advanced terrestrial digital broadcasting service is transmitted is the MMT method in principle. As a modified example, an MPEG-2 TS stream may be used in the advanced terrestrial digital broadcasting service. Also, the method of the stream obtained by demodulating the transmission wave in 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 delivering content, and the diversification of content storage environments.

[0263] The video and audio signals of the broadcast program are encoded in MFU (Media Fragment Unit) / MPU (Media Processing Unit), loaded on the MMTP (MMT Protocol) payload, packetized as 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, loaded on the MMTP payload, packetized as MMTP packets, and transmitted in IP packets.

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

[0265] Figure 10A shows the MMT protocol stack on a broadcast transmission path, and 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 in the form of an MMT control message, placed on 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 a three-layer structure including 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-based 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-based 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) MH-Application Descriptor (45) MH-Transport Protocol Descriptor (46)MH-Simple Application Location Descriptor (MH-Simple Application Location Descriptor) (47) Application Boundary Authority 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 representative tables in the MMT - based broadcast system.

[0285] In the MMT - based broadcast system, data can be transmitted 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 containing a series of video MPUs and an audio asset containing a series of audio MPUs. Furthermore, a subtitle asset containing a series of subtitle MPUs, a character super asset containing a series of character super MPUs, a data asset containing 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 flows (3) Data multiplexed in IPv6 data flows (4) Data multiplexed into the 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 the above.

[0287] MMT broadcasting systems further have the concept of an event. An event is a concept indicating a so-called program handled by the MH-EIT sent in an M2 section message. Specifically, a series of data included in a period of time from the start time stored in the MH-EIT in a package indicated by an event package descriptor stored in the MH-EIT is data included in the concept of the event. The MH-EIT can be used in broadcast receiving device 100 for various processes on an event basis (for example, program guide generation process, control of recording and viewing reservations, copyright management process such as temporary storage, etc.).

[0288] [Channel setting process for broadcast receiving device] <Initial scan> In the current terrestrial digital broadcasting, the network ID is different for each sending master, and the NIT generally does not include information on other stations. Therefore, the broadcast receiving device 100 of the embodiment of the present invention, which has compatibility with the current terrestrial digital broadcasting, needs to have a function of 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 in different layers), and creating a service list (receivable frequency table) based on the service ID. In areas where the same network ID can be received on different physical channels by 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, in the 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 the 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 rescan function in preparation for cases where a new station opens, a new relay station is installed, the receiving point of a television receiver is changed, etc. When changing existing information, the broadcast receiving device 100 can notify the user of this.

[0291] <Example of operation during initial / rescan> Fig. 11A shows an example of an operation sequence of a channel setting process (initial / rescan) of the broadcast receiving device 100 according to the embodiment of the present invention. Note that Fig. 11A shows an example in which MPEG-2 TS is used as the media transport method, but 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). At this time, instead of the user instruction, the residential area may be automatically set based on installation location information of the broadcast receiving device 100 acquired by a predetermined process. As an example of the installation location information acquisition process, information may be acquired from a network to which the LAN communication unit 121 is connected, or information on the installation location may be acquired from an external device to which the digital I / F unit 125 is connected. Next, an initial value of the frequency range to be scanned is set, and an instruction is given to the tuner / demodulator (when the first tuner / demodulator 130C, the second tuner / demodulator 130T, and the third tuner / demodulator 130L are not distinguished, this is described as such. 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 of S104. If it does not succeed in locking (S103: No), it proceeds to processing of S111. In processing of 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 of 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 of 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 or not (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 whether the transport stream ID acquired in the process of S106 has already been acquired by checking the service list stored in the receiving device (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 associated with the transport stream ID and added to the service list (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 already listed in the service list was acquired (S109). As a result, 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] In addition, when creating (adding / updating) the service list, a remote control key ID may be obtained from the TS information descriptor, and a representative service for each transport stream may be associated with a remote control key. This process enables one-touch channel selection, which will be described later.

[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 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). 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 the broadcast receiving device 100.

[0299] FIG. 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. FIG. 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. FIG. 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. FIG. 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 appropriately change the frequency range to be scanned according to the broadcast service to be received. For example, when the broadcast receiving device 100 is receiving the broadcast waves of the current terrestrial digital broadcast service, the device is controlled to scan a frequency range of 470 to 770 MHz (corresponding to physical channels 13ch to 62ch). 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] Also, when the broadcast receiving device 100 is receiving a broadcast wave including an advanced terrestrial digital broadcasting service, the device is controlled to scan a frequency range of 470 to 1010 MHz (because there is a possibility that the frequency conversion process shown in FIG. 7D or the frequency conversion and amplification process shown in FIG. 8C has 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 frequency value is increased by +6 MHz in the process of S112. Even if the broadcast receiving device 100 is receiving an advanced terrestrial digital broadcasting service, if it is determined that the above-mentioned frequency conversion process or frequency conversion and amplification process has not been performed, the device may be controlled to scan only a 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] In addition, when the broadcasting system according to the embodiment of the present invention has the configuration shown in FIG. 7C, for example, and the broadcast receiving device 100 receives an advanced terrestrial digital broadcasting service using a dual-polarized transmission method, one of the tuning / detection unit 131H and the tuning / detection unit 131V may scan a frequency range of 470 to 770 MHz, and the other may scan a frequency range of 770 to 1010 MHz (when a frequency conversion process is performed on the transmission wave with the polarized wave detected by the other tuning / detection unit). By controlling in this way based on the system identification and frequency conversion process identification of the TMCC information, it is possible to omit scanning in unnecessary frequency ranges, and it is possible to reduce the time required for channel setting. Furthermore, in this case, the operation sequence of FIG. 11A may be performed in parallel in both the tuning / detection unit 131H and the tuning / detection unit 131V, and the loop of frequency up S112 in the operation sequence of FIG. 11A may be synchronized. At this time, if a configuration is made such that pairs of horizontally polarized and vertically polarized signals transmitted on the same physical channel are received in parallel in the frequency-up loop at the same timing in the operational sequence of Figure 11A, control information and the like within the packet stream of the advanced terrestrial digital service transmitted by the pair of horizontally polarized and vertically polarized signals can be decoded and acquired during the loop processing. This is preferable because it allows for efficient scanning and service list creation.

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

[0304] As described in Fig. 8A, Fig. 8B, and Fig. 8C, the terrestrial digital broadcasting service transmitted on either the upper layer or the lower layer in the configuration shown in Fig. 8B 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, between the frequency range of 470 to 770 MHz and the frequency range of 770 to 1010 MHz, and the third tuner / demodulator 130L may scan the other frequency range in parallel. In this case, it is possible to reduce the time required for channel setting, as in the parallel scanning by the double tuners of the third tuner / demodulator 130L described above. 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 two points in total, one point for each frequency range, for example, 470 to 476 MHz (center frequency 473 MHz) and 770 to 776 MHz (center frequency 773 MHz), using the third tuner / demodulator unit 130L before starting the initial scan / rescan operation sequence, obtaining the TMCC information transmitted at each frequency, and referring to parameters (for example, system identification parameters) stored in the TMCC information.

[0305] In the case of an advanced terrestrial digital broadcasting service using a dual-polarized transmission system, for example, in the case of a channel having a broadcast program that transmits using both horizontally polarized signals and vertically polarized signals, such as a 4K broadcast program on layer C shown in layer division example (1) of FIG. 7A, the same transport ID is detected by scanning both the frequency range of 470 to 770 MHz and the frequency range of 770 to 1010 MHz, but this is recorded in the service list as one channel. In the case of a 2K broadcast program on layer B shown in FIG. 7A, if the same broadcast program is transmitted on layer B of a horizontally polarized signal and layer B of a vertically polarized signal, even if the same transport ID is detected, it is sufficient to store it in the service list as one channel. In other words, if the same broadcast program is transmitted on the same layer transmitted with different polarizations, it is recognized as being merged into one channel and not recognized as separate channels. In this way, it is possible to avoid user confusion, etc., caused by the existence of the exact same broadcast program on different channels in a channel selection process using a service list.

[0306] In contrast, in an advanced terrestrial digital broadcasting service using a dual-polarized transmission system, when different broadcast programs are transmitted on layer B of the horizontally polarized signal and layer B of the vertically polarized signal (when layer B of the vertically polarized signal is treated as a virtual layer D), they are stored in the service list as different channels. Whether the same broadcast program is transmitted on layer B of the horizontally polarized signal and layer B of the vertically polarized signal can be identified by referring to an additional layer transmission identification parameter in the TMCC information, etc., in broadcast receiving device 100.

[0307] [Channel selection process for broadcast receiving devices] The broadcast receiving device 100 according to the embodiment of the present invention has a program selection function such as one-touch channel selection using a one-touch key on a remote control, channel up / down channel selection using a channel up / down key on a remote control, and direct channel selection by directly inputting a three-digit number using a numeric keypad on a remote control. Any of the channel selection functions may be performed using information stored in the service list generated by the above-mentioned initial scan / rescan. After channel selection, information on the selected channel (three-digit number used for direct channel selection, branch number, TS name, service name, logo, video resolution information (such as distinction between UHD, HD, and SD), presence or absence of video resolution up / down conversion, number of audio channels, presence or absence of audio downmix, etc.) is displayed by a banner display or the like. In this way, the user can visually obtain information on the channel after selection and can check whether the desired channel has been selected. An example of processing in each channel selection method is described below.

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

[0309] <Example of up-down channel selection using the channel up-down buttons> (1) By pressing the channel up / down keys on the remote control, channels are 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 minimum 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 in the service list, the service with the largest number is selected. (2) Set the last mode and display channel information after channel selection.

[0310] <Example of direct channel selection processing> (1) When direct channel selection is selected, the device 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 mode returns to normal and channel information of the currently selected service is displayed. (2-2) When the entry of the three-digit number is completed, a check is made to see if the channel exists in the service list of the receivable frequency table. 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 out of service, 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 control 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] The remote control 180R also includes a network switching key (advanced digital terrestrial broadcasting, digital terrestrial broadcasting, advanced BS broadcasting, BS, CS broadcasting) 180R5 for switching the broadcast network received by the broadcast receiving device 100. The remote control 180R also includes one-touch keys (1-12) 180R6 used for one-touch channel selection, channel up / down keys 180R7 used for channel up / down channel selection, and a 10 key used for inputting a 3-digit number when selecting a channel directly. In the example shown in FIG. 12A, the 10 key also serves as the one-touch key 180R6, and when selecting a channel directly, a 3-digit number can be input by operating the one-touch key 180R6 after pressing the 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] Remote control 180R also includes d key 180RB used for data broadcasting services, multimedia services, etc., link key 180RC for displaying broadcasting and communication linkage services and a list of corresponding applications, etc., and color keys (blue, red, green, yellow) 180RD. For data broadcasting services, multimedia services, broadcasting and communication linkage services, etc., detailed operations are possible using cursor keys 180R2, decision key 180R3, back key 180R4, and color keys 180RD.

[0317] The remote control 180R also includes a video key 180RE for selecting a related video, an audio key 180RF for switching between audio ES and two languages, and a subtitle key 180RG for switching subtitles on / off and switching the subtitle language. The remote control 180R also includes 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 advanced digital terrestrial key> The remote control 180R of the broadcast receiving device 100 according to the embodiment of the present invention includes an "advanced terrestrial digital key", a "terrestrial digital key", an "advanced BS key", a "BS key", and a "CS key" as the network switching key 180R5. Here, the "advanced terrestrial digital key" and the "terrestrial digital key" may be configured so that, for example, in the case where simulcast of 4K broadcast programs and 2K broadcast programs is carried out in different layers in an advanced terrestrial digital broadcasting service, when the "advanced terrestrial digital key" is pressed, the selection of a 4K broadcast program is prioritized when selecting a channel, and when the "terrestrial digital key" is pressed, the selection of a 2K broadcast program is prioritized when selecting a channel. By controlling in this way, for example, when there are many errors in the transmission wave of a 4K broadcast program in a situation where a 4K broadcast program can be received, it is possible to perform control such as forcibly selecting a 2K broadcast program by pressing the "terrestrial digital key".

[0319] <Screen display example when selecting a station> As described above, the broadcast receiving device 100 of an embodiment of the present invention has a function of displaying information about the selected channel by displaying a banner, etc., when a channel is selected by one-touch channel selection, channel up / down selection, direct channel selection, etc.

[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, and may display, for example, the program name, the program start time / end time, the network type, the number of the direct channel selection key on the remote control, the 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, and may further display, for example, a mark symbolizing "advanced" indicating that the program being received is a 4K broadcast program, in addition to the various information similar to that of banner display 192A1 described above. In addition, when resolution conversion processing, downmix processing, etc. are performed, a display indicating that may be performed may be displayed. In the example of banner display 192A2, as an example, it is displayed that downconversion processing from UHD resolution to HD resolution and downmix processing from 22.2ch to 5.1ch have been performed.

[0321] By performing these displays 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 simulcast or the like, the user can easily understand which broadcast program is being displayed.

[0322] According to the system for an advanced digital broadcasting service having some or all of the functions according to the embodiments of the present invention described above, it is possible to provide a transmission technique and a reception technique for an advanced digital broadcasting service with higher functionality that also takes into consideration compatibility with the current digital broadcasting service. In other words, it is possible to provide a technique for more suitably transmitting or receiving the advanced digital broadcasting service.

[0323] Example 2 [System configuration for clock synchronization / presentation synchronization of broadcast receiving devices] In this embodiment, an example of a simulcast presentation switching process and clock synchronization / presentation synchronization in the advanced digital broadcasting service system described in embodiment 1 will be described. For simplicity of explanation, only the differences from embodiment 1 will be described below. Points not mentioned in this embodiment are the same as embodiment 1, so repeated explanations will be omitted.

[0324] In the MPEG2-TS method, synchronization control is performed using a time stamp based on time information called PCR (Program Clock Reference). The protocol stack of the MPEG2-TS method is shown in Figure 9A. This PCR-based time system consists of a high-order 33-bit counter that operates at 90 kHz and a low-order 9-bit counter that operates at 27 MHz. A count of 300 in the low-order 9 bits corresponds to one count in the high-order 90 kHz. This high-order 33-bit counter completes one cycle in approximately 26.5 hours, and the counter returns to 0. On the other hand, in the MMT method, synchronization control is performed using a time stamp based on time information called NTP (Network Time Protocol). The protocol stack of the MMT method is shown in Figures 10A and 10B. This clock synchronized with NTP consists of high-order 32 bits (second units) and low-order 32 bits (decimal part). Therefore, the NTP-based clock can express a period of approximately 136 years, and is completely different from the PCR system as a time expression system.

[0325] 13 shows an example of a system clock unit 40000 used for clock synchronization / presentation synchronization by the broadcast receiving device 100 of this embodiment. It has an NTP clock counter 40001 based on NTP and a PCR clock counter 40002 based on PCR.

[0326] The PCR time information is transmitted in the extension part (adaptation field) of the TS packet header (Figure 14). It consists of 33 upper bits, 9 lower bits, and 6 reserved bits.

[0327] An example of the configuration of time information transmitted by NTP is shown in Fig. 15A. Also, an example of the data structure of the MPU timestamp descriptor is shown in Fig. 15B. NTP is transmitted in this data format, but it can also be consistent with the NTP included in a signal received on a communication line path (for example, a communication line that can be received by the LAN communication unit 121 in Fig. 2A) as shown in Fig. 10B.

[0328] In the broadcasting system handling the MMT content of this embodiment, UTC is transmitted from the broadcast transmission system to the receiver (such as the broadcast receiving device 100 of this embodiment) in a 64-bit NTP timestamp format. In the NTP timestamp format, "seconds or more" of UTC are represented by 32 bits, and "less than a second" is represented by 32 bits. However, in reality, it is difficult to reproduce one second with 32-bit accuracy. For this reason, as an NTP system clock for synchronizing MMT content or an NTP system clock for operating an NTP format clock, for example, an NTP clock counter 40001 using a frequency of "2 to the power of 24" Hz (approximately 16.8 MHz) as shown in FIG. 13 may be used. Note that, considering that the PCR system clock in the broadcasting system handling MPEG2-TS content was 27 MHz and that the hardware configuration of the receiver can be easily constructed, it is desirable to adopt a frequency of a power of 2, such as "2 to the power of 24" to "2 to the power of 28", as the NTP system clock.

[0329] In addition, when the NTP system clock is set to a frequency of a power of 2 such as "2 to the power of 24" to "2 to the power of 28" on the broadcast transmission system side or the receiver side that handles MMT contents as described above, the lower 8 to 4 bits in the NTP timestamp format transmitted from the broadcast transmission system side to the receiver side, which are not referenced by the NTP system clock or the PLL (Phase Locked Loop) system for regenerating the NTP format clock, may be fixed to "0" or "1". In other words, if the NTP system clock is "2 to the power of n" Hz (n=24 in the example of FIG. 13), the lower "32-n" bits of the NTP timestamp format may be fixed to "0" or "1". Alternatively, the receiver side may process the lower "32-n" bits of the NTP timestamp format to be ignored.

[0330] When the broadcast transmission system receives time information in NTP format from an external source, it configures a PLL system with a 32+n-bit counter using a 2n-Hz VCO (Voltage Controlled Oscillator) to realize a transmission system clock that synchronizes with the externally provided time information. It also operates the entire signal processing system in synchronization with the 2n-Hz NTP system clock. Furthermore, it periodically transmits the output of the transmission system clock to the receiver side via the broadcast transmission path as time information in NTP long format.

[0331] The receiver receives the time information in the NTP long format via the broadcast transmission path, and regenerates the receiving system clock by a PLL system based on a VCO of "2 to the power of n" Hz, just like the broadcast transmission system. This makes the receiving system clock synchronized with the broadcast transmission system. In addition, by operating the signal processing system of the receiver in synchronization with the NTP system clock of "2 to the power of n" Hz, clock synchronization between the broadcast transmission system and the receiver is realized, enabling stable signal reproduction. In addition, the decoding time and presentation time for each presentation unit of the video / audio signal are set on the broadcast transmission system side based on the time information in the NTP format. Here, the MPT stored in the PA message transmitted by the broadcast signal stores the MPU timestamp descriptor shown in FIG. 15B described above. The "mpu_sequence_number (MPU sequence number)" parameter in the MPU timestamp descriptor in FIG. 15B indicates the sequence number of the MPU that describes the timestamp, and the "mpu_presentation_time (MPU presentation time)" parameter indicates the presentation time of the MPU in 64-bit NTP timestamp format. Therefore, the receiver can refer to the MPU timestamp descriptor stored in the MPT and control the presentation (display, output, etc.) timing of video signals, audio signals, subtitles, superimposed text, etc. for each MPU.

[0332] In addition, when focusing on the control of the decoding timing and presentation timing for each presentation unit of the above-mentioned video / audio signals, the synchronization of the video / audio signals can be ensured even with a clock of about 2 to the power of 16 Hz (approximately 65.5 KHz), and in this case, it is not necessary to refer to the lower 16 bits of the NTP timestamp format described in the MPU timestamp descriptor, etc. In other words, if a clock of 2 to the power of m Hz generated by dividing the NTP system clock, etc. is used to control the decoding timing and presentation timing, it is not necessary to refer to the lower 32-m bits of the NTP timestamp format described in the MPU timestamp descriptor, etc. Therefore, the lower 32-m bits of the NTP timestamp format described in the MPU timestamp descriptor, etc. may be fixed to 0 or 1.

[0333] <Simul broadcast switching> In this method, as described in the first embodiment, it is also possible to simulcast 4K and 2K broadcasts on the same physical channel. If it becomes difficult to receive, demodulate, or display 4K broadcasts for some reason (for example, a problem with the control information of the 4K broadcast), it is possible to automatically or manually switch to 2K simulcast as a backup. Furthermore, if the situation improves and it becomes possible to receive 4K broadcasts, it is possible to automatically or manually switch to 4K simulcast. If it is within the same physical channel, the switching is performed smoothly. Simulcast may also be IP simulcast (Internet broadcast) via a network (communication transmission path). In the case of Internet broadcasting, when it becomes possible to receive broadcasts via radio waves, it is desirable to quickly switch to radio wave reception in order to reduce network traffic congestion.

[0334] When there are multiple options for simulcast as backup, the switching may be performed automatically according to a predetermined priority. For example, when it becomes difficult to receive 4K broadcast while watching 4K broadcast transmitted through a broadcast transmission path for some reason, the first priority may be given to switching to simulcast of 2K broadcast transmitted through the same physical channel of the broadcast transmission path, and the second priority may be given to switching to simulcast via a communication network. In general, broadcast reception through a broadcast transmission path can be switched to faster than IP broadcast reception through a communication transmission path, so it is preferable to give a higher priority to switching to simulcast on the broadcast transmission path and a lower priority to switching to simulcast on a communication transmission path. In addition, as another example of processing for switching to simulcast when there are multiple options for simulcast as backup, the user may be shown the options and allowed to manually select. In addition, the backup may be VOD (Video On Demand) content. When switching to VOD, it is desirable to play back the VOD content from the middle so that the viewing content can be continued. Fig. 16 shows an example in which a banner display 40020 is displayed as an option for switching to a simulcast (alternative broadcast) when the reception state of a 4K broadcast deteriorates. Fig. 16 shows an example in which pressing the blue button on the remote control switches to a simulcast of terrestrial digital 2K broadcast on the same physical channel, and pressing the red button switches to an Internet broadcast of the same content. Presentation of these content switching options and their selection may be performed by a mobile information terminal 700 running an application linked to the broadcast receiving device 100 (Fig. 17). Note that in any of the above cases, the presentation of content switching options may be limited to options available at that time.

[0335] Also, if the reception of a 4K broadcast becomes poor while recording, you can switch to a 2K broadcast via simulcast and continue recording. If you want to start recording a 2K broadcast as a backup, you can upconvert the 2K video to 4K video to keep the video format continuous.

[0336] Simulcasting on the same physical channel in this way makes it easier to switch programs when reception conditions change. Also, combining it with Internet broadcasting expands the number of backup options.

[0337] <Emergency broadcast> In an advanced digital broadcasting service system, when 4K and 2K broadcasts are being simulcast, in the event of an emergency, the transmitting side may switch the 4K and 2K broadcasts being simulcast to emergency broadcasts. Also, the transmitting side may switch only the 2K broadcast to emergency broadcast. Note that when the transmitting side switches the 4K and 2K broadcasts being simulcast to emergency broadcasts, or when the transmitting side switches only the 2K broadcast to emergency broadcast, the broadcast receiving device may forcibly switch to viewing (receiving and displaying) the 2K broadcast screen (emergency broadcast program) even while viewing (receiving and displaying) a 4K broadcast program. This switching process may be performed based on emergency alert information received via the 4K broadcast. The 2K broadcast, which is technically easier than the technically advanced 4K broadcast, is more likely to be a stable broadcast, and priority is given to receiving and displaying the 2K broadcast in an emergency to more reliably convey emergency information to the viewer. Also, after switching to emergency broadcast in the broadcast receiving device, the viewer may be able to switch to a non-emergency 4K broadcast at his / her discretion. Furthermore, during an emergency broadcast in either the 4K broadcast or the 2K broadcast that are simulcast together, switching to the other broadcast that is not an emergency broadcast may be prohibited.

[0338] Furthermore, if the user has switched to viewing an Internet broadcast, which is a communication transmission path, the user may be forced to view the broadcast that has been switched to the emergency broadcast among the broadcasts transmitted via radio waves, which are broadcast transmission paths, at the same time as the emergency broadcast starts. In particular, if the emergency broadcast is transmitted in a number of different transport stream formats, the user may be forced to view the emergency broadcast in the MPEG2-TS format, which can be received more stably.

[0339] By forcibly switching to emergency broadcasting as described above, emergency information can be reliably conveyed to viewers.

[0340] <Waiting for synchronization> As described above, when content is switched depending on the reception status of broadcasts, a different simulcast is switched to when the reception status deteriorates, and the original simulcast is restored when the reception status improves. In this case, if the 4K broadcast is MMT format and the 2K broadcast is MPEG2-TS format, the switching between simulcasts is between MMT format and MPEG2-TS format. Switching between simulcasts is different from normal channel selection, and since the programs have the same content, it is desirable that the interruption during switching is as short as possible. For this reason, when a program is displayed or recording is started (not displayed), the clock counter (40001 or 40002) of the corresponding format may be synchronized for the simulcast that is not currently being viewed (displayed) between the 4K broadcast in MMT format and the 2K broadcast in MPEG2-TS format so that display, recording, etc. can be performed quickly (standby synchronization). In this way, the interruption time of the video can be shortened or the interruption can be eliminated compared to when standby synchronization is not performed. If standby synchronization is not performed, synchronization of the internal clock is started or resumed at the start of display, recording, etc. that uses the corresponding internal clock (40001 or 40002). In this case, it takes time to establish synchronization of the internal clock counter (40001 or 40002).

[0341] Furthermore, standby synchronization may be performed all the time when time information of NTP used in the MMT method or PCR used in the MPEG2-TS method can be received, or may be performed when switching is predicted. For example, when the reception condition of 4K broadcasting is deteriorated during reception and it is predicted that it will be difficult to continue reception, standby synchronization of PCR clock counter 40002 may be started using the PCR of the corresponding 2K simulcast broadcast. Furthermore, when the deteriorated reception condition of 4K broadcasting is recovered and it is predicted that it will be possible to resume reception, standby synchronization of NTP clock counter 40001 may be started using the NTP of the 4K broadcast that the user wishes to resume viewing.

[0342] If viewing of 4K broadcasting becomes difficult due to deterioration of reception conditions and the reception conditions of 4K broadcasting are restored after switching to 2K simulcast, if in standby synchronization mode, synchronization of the NTP clock counter 40001 is quickly restored and a return to 4K broadcasting can be achieved quickly. A return to 4K broadcasting may be performed automatically when the reception conditions improve, or the viewer may be informed that a return to 4K broadcasting is possible after synchronization of the NTP clock counter is restored while viewing the backup 2K broadcast, and an instruction to return may be awaited.

[0343] If you are recording a 4K broadcast and the 4K reception deteriorates and you switch to a simulcast 2K broadcast to continue recording, by keeping the camera in standby synchronization mode, the internal clock counter (40001 or 40002) will be synchronized before switching to the 2K broadcast, or when you return to recording the 4K broadcast as the 4K reception improves, so the interruption of the video can be shortened or eliminated.

[0344] In this way, by performing standby synchronization of the system clock, it is possible to improve the viewing environment when switching between transmission methods.

[0345] <Adjustment of leap seconds> Unlike PCR, the time system based on NTP is an absolute time and leap second adjustments are required. Leap second adjustments can be made either by inserting a leap second into the NTP time on the broadcasting side or by deleting the leap second from the NTP time on the broadcasting side. When a leap second is inserted, 8:59:59 continues for two seconds, and when a leap second is deleted, one second after 8:59:58 becomes 9:00:00.

[0346] In the broadcast receiving device 100, when the NTP system clock in the receiver (NTP clock counter 40001 in FIG. 13) is being used for display or recording (referred to as viewing in this embodiment), one of two methods is used to reflect leap second adjustments in the NTP system clock.

[0347] (1) Adjustment operation 1 The receiver synchronizes with the received NTP time and reflects the leap second adjustment on the broadcasting side in the NTP system clock in the receiver. In other words, when the leap second adjustment is made, if a leap second is added, 8:59:59 will continue for 2 seconds, and if a leap second is deleted, 8:59:59 will not exist.

[0348] (2) Adjustment operation 2 Adjustment operation 2 is different from adjustment operation 1. In adjustment operation 2, even if the leap second adjustment is performed on the broadcasting side, the NTP system clock in the receiver continues to advance the time by one second independently without reflecting the leap second adjustment. This prevents time overlaps and time discontinuities from occurring in the receiver at the moment of leap second adjustment. Therefore, after the leap second adjustment on the broadcasting side, a one-second difference occurs between the NTP time transmitted by the broadcast wave and the NTP system clock in the receiver. This state continues until a specified operation such as channel selection or simulcast switching is performed, during which the NTP time and the NTP system clock in the receiver remain one second apart and the leap second adjustment on the broadcasting side is not reflected. In this state, the NTP system clock in the receiver may be in a so-called free-running state in which it is not synchronized with the NTP time.

[0349] Also, the NTP time and the NTP system clock in the receiver may be left in a state where they are out of sync by one second in units of seconds, and may continue to be synchronized in units of less than one second. After that, when the above-mentioned predetermined operation is executed, the leap second adjustment of the NTP time may be reflected in the NTP system clock in the receiver (eliminating the one-second lag). In this way, overlaps and discontinuities in the NTP system clock time in the receiver are not generated while the user is watching, and it is possible to prevent the user from being presented with image disturbances based on these. The above-mentioned predetermined operation may include an operation of switching to a full-screen EPG display. The same effect can be obtained by including other operations, such as switching from the video decode screen of the MMT that uses the NTP system clock in the receiver to another screen, in the above-mentioned predetermined operation. Note that, if the NTP system clock in the receiver is no longer used after channel selection or simulcast switching and the above-mentioned standby synchronization is not performed, it is not necessary to synchronize the NTP time and the NTP system clock in the receiver in the first place.

[0350] Next, a leap second adjustment of the NTP system clock in the receiver will be described when the NTP system clock in the receiver is not being used (referred to as standby in this embodiment). In this case, the above-mentioned standby synchronization is being performed in preparation for the start of displaying or recording MMT content. In this case, since it is desirable to always be synchronized with the NTP time in preparation for the start of use of the NTP system clock in the receiver, the above-mentioned adjustment operation 1 is performed.

[0351] The broadcast transmission system transmits information for leap second adjustment (information indicating the type of leap second adjustment process) as the descriptor "time_leap_indicator" together with the information to be presented, and the broadcast receiving device 100 adjusts the NTP system clock in the receiver based on that information for leap second adjustment. The value set in "time_leap_indicator" indicates 1 when leap second adjustment is performed on the system clock of the transmission system if the presentation time of the information to be presented is from 9:00:00 AM on the day before the leap second insertion date to 8:59:59 AM for the first leap second insertion date, Japan time, 2 if the presentation time is from 9:00:00 AM on the day before the leap second removal date to 8:59:58 AM on the leap second removal date, and 0 in other cases.

[0352] Depending on the value of this leap second adjustment descriptor and the value of the NTP system clock in the receiver, the leap second correction state can be classified into several states as follows. a: Leap second correction within 24 hours (descriptor value is 1 or 2) b: No leap second correction within 24 hours (descriptor value is 0) c: Leap second adjustment of the NTP system clock in the receiver is complete (synchronized state) d: 8:59:59, the second second after adding time e: Asynchronous state (advance) f: Asynchronous state (delay)

[0353] Here, states c to f are states immediately after leap second correction, and since leap second correction does not usually occur frequently, they are also state b. Figures 18A and 18B show the operation of leap second adjustment in the NTP system clock in the receiver, including these states. Figure 18A shows the case of adding time, and Figure 18B shows the case of deleting time. The figures show the cases where leap second adjustment is performed while watching and while waiting. Note that "channel selection, etc." refers to predetermined events such as channel selection, switching to simulcast, processing to change the service being watched by turning the power on, and switching to full-screen EPG display, and the states thereafter are shown assuming that clock synchronization operation is being performed. Furthermore, the times and durations of "channel selection, etc." are merely examples.

[0354] As shown in FIG. 18A and FIG. 18B, not only adjustment operation 1 but also adjustment operation 2 may be adopted during viewing. When adjustment operation 2 is performed, a discrepancy occurs between the NTP time of the transmission system and the time of the NTP system clock in the receiver. Since the MPU for video, etc. has the "mpu_presentation_time" descriptor set as the presentation time based on the time of the transmission system, the value of this descriptor is corrected in the broadcast receiving device 100 to match the time of the NTP system clock in the receiver. In contrast, during standby, there is no need to consider the impact on the user's viewing, so adjustment operation 1 may be adopted. Therefore, in the broadcast receiving device 100 that adopts adjustment operation 2 as the adjustment operation during viewing, when the leap second adjustment is performed on the broadcast station side, if the broadcast receiving device 100 is in a state in which a program reproduced using the NTP system clock in the receiver is being viewed, adjustment operation 2 is performed, and if the program reproduced using the NTP system clock in the receiver is in a standby state and not being viewed, adjustment operation 1 is performed. In this way, leap second adjustment can be performed quickly while suitably reducing the impact on the user's viewing.

[0355] <Handling cases where there are multiple types of leap second adjustment descriptors> In the above, there is only one type of leap second adjustment descriptor, "time_leap_indicator", but multiple types of descriptors may be provided according to the type of information to be presented. For example, two types may be provided: one type ("reference_start_time_leap_indicator") for displaying subtitles, and one type ("mpu_presentation_time_leap_indicator") for presenting video and audio.

[0356] When using different NTP system clocks in the receiver for each content display, leap second adjustment is performed on the NTP system clock in the receiver using the corresponding leap second adjustment descriptor. For example, one type of NTP system clock in the receiver can be configured for video and audio presentation, and another type of NTP system clock in the receiver for subtitle display. In this case, in principle, the NTP system clock in the receiver for video and audio presentation should use "mpu_presentation_time_leap_indicator" as the leap second adjustment descriptor. Also, in principle, the NTP system clock in the receiver for subtitle display presentation should use "reference_start_time_leap_indicator" as the leap second adjustment descriptor.

[0357] Alternatively, the NTP system clock in the receiver may be made into a single common clock. Since the value of the leap second adjustment descriptor should be the same regardless of the type of information to be presented, any leap second adjustment descriptor may be used to perform leap second adjustment of the NTP system clock in the receiver.

[0358] However, since the types are separated, there is a possibility that some malfunction in the sending system may cause the values ​​of these leap second adjustment descriptors to differ depending on the type. In that case, one method is for the broadcast receiving device to follow the leap second adjustment descriptor value corresponding to the information that requires more accurate presentation synchronization. In this case, priority is given to "mpu_presentation_time_leap_indicator", which is for video and audio presentation, and this descriptor may be used for subtitle display, which is a presentation process other than video and audio.

[0359] Also, considering the complexity of the processing on the sending system side, it is less likely that the leap second adjustment descriptor corresponding to simpler information will result in an incorrect value, so it is also a method to follow that descriptor. In this case, the "reference_start_time_leap_indicator" takes precedence.

[0360] Furthermore, the leap second adjustment descriptor information only needs to be obtained after it has been decided that a leap second correction will be performed and before the leap second correction is actually performed, and if the information is accurate, once it has reached a value indicating that a leap second correction will be performed, that value will not change until the leap second correction is actually performed. Therefore, it is also effective to monitor the value of the leap second adjustment descriptor regardless of its type, and treat the monitored value that appears most frequently as the accurate value.

[0361] The time management method described above enables quick display switching and accurate display control.

[0362] Example 3 [Time management method for content management] In this embodiment, an example of a method of time management used for generating a program guide, controlling recording and viewing reservations, and copyright management such as temporary storage will be described. For simplicity, only the differences from the first embodiment will be described below. Points not mentioned in this embodiment are the same as those in the first embodiment, and therefore will not be described again.

[0363] The broadcast receiving device of this embodiment has two types of time management functions. The first time management function is a time management function based on NTP or PCR, and is used for controlling content decoding and presentation synchronization as described in the above embodiment. The second time management function is the time managed by the "Time_Offset_Table", and is used for generating a program guide, controlling recording and viewing reservations, and copyright management processing such as temporary storage. The time information in the "Time_Offset_Table" is transmitted by TOT shown in FIG. 9B in the MPEG2-TS method, and by MH-TOT (MH-Time_Offset_Table) shown in FIG. 10F in the MMT method. Since both transmit the same information, when no distinction is required, TOT in the MPEG2-TS method and MH-TOT in the MMT method are collectively referred to as TOT in the following embodiments.

[0364] As described in the previous embodiment, NTP and PCR are used for synchronizing the presentation of content, and therefore can manage time in units of less than a second. However, the information transmitted by TOT is as follows. The broadcast receiving device 100 is assumed to be able to obtain the current date and Japan Standard Time from the TOT. FIG. 19A shows an example of the data structure of the TOT. The broadcast receiving device 100 is assumed to be able to obtain the current date and the current time from the "JST_time" parameter of the TOT. As shown in FIG. 19B, the "JST_time" parameter is assumed to include the lower 16 bits of the coded data of the current date based on the Modified Julian Date (MJD) and 24 bits of information that expresses Japan Standard Time (JST) in six 4-bit binary-coded decimal (BCD) numbers. The current date can be calculated by performing a predetermined calculation on the 16-bit coded data of the MJD. The six 4-bit binary coded decimal numbers consist of two 4-bit binary coded decimal numbers that represent the hour in two decimal digits, the next two 4-bit binary coded decimal numbers that represent the minutes in two decimal digits, and the last two 4-bit binary coded decimal numbers that represent the seconds in two decimal digits.

[0365] In the broadcast receiving device 100 of this embodiment, a time management function based on "JST_time" including 24-bit information expressed by six 4-bit binary-coded decimal numbers of this TOT is used for the process of presenting the current time to the user or each process that handles the event information table. The event information table is transmitted by EIT shown in FIG. 9B in the MPEG2-TS method, and by MH-EIT (MH-Event_Information_Table) shown in FIG. 10F in the MMT method. Since both transmit information with the same structure, the EIT in the MPEG2-TS method and the MH-EIT in the MMT method are collectively referred to as EIT in the following in this embodiment unless a distinction is required. An example of the data structure of this EIT is shown in FIG. 20. "start_time" in FIG. 20 is the start time of the event, and is stored in the same format as FIG. 19B. Furthermore, "duration_time" in Figure 20 is the duration of the event, and is stored in the form of 24 bits of information represented by six 4-bit binary-coded decimal numbers, each with two decimal digits for "hours," "minutes," and "seconds."

[0366] Generally, in the process of presenting the current time to a user in a broadcast receiving device, accuracy of less than a second is rarely required. In addition, each piece of time information described in the EIT is compatible with the format of the time information in the TOT as described above. Specifically, processes using the EIT include the process of generating a program guide, control of recording and viewing reservations, copyright management processes such as temporary storage, etc. Accuracy of less than a second is rarely required for any of the processes, and accuracy of one second is sufficient. In this way, considering the required accuracy of time management and the data format, using a time management function based on the TOT for the process of presenting the current time and each process using the EIT will eliminate wasteful processing and reduce costs.

[0367] Here, in the broadcast receiving device 100 of this embodiment, both MPEG2-TS and MMT programs may be received on one physical channel. In this case, the TOT can receive both MPEG2-TS and MMT MH-TOT, but the TOT of the program being viewed is used.

[0368] <Modification Example of Time Management by TOT> However, considering that a 2K program in the MPEG2-TS format and a 4K program in the MMT format are simulcast, and there may be a situation where the reception status of the 4K program deteriorates and it may be switched to the 2K program as a backup, regardless of which program is being viewed, the time management of the broadcast receiver 100 may be performed using the TOT transmitted in the more stable MPEG2-TS format.

[0369] Furthermore, when switching to viewing VOD content via the Internet as backup content, since the deterioration of the reception status of the 4K program is the cause in the first place, it is advisable to use the TOT transmitted in the MPEG2-TS format as the TOT for time management of the broadcast receiver 100. During the viewing of the 4K program, time management is performed using the MH-TOT transmitted in the MMT format, and after switching to the viewing of the backup VOD content, it is also possible to switch to time management using the TOT transmitted in the MPEG2-TS format.

[0370] As described above, by using the TOT transmitted by the MPEG2-TS format that can be received more stably on the physical channel during reception for the time management of the broadcast receiving apparatus 100, more stable time management can be realized.

[0371] According to the system of the advanced digital broadcast service having some or all of the functions of each function according to the embodiment of the present invention described above, it is possible to provide a transmission technology and a reception technology of a more highly functional advanced digital broadcast service considering compatibility with the current digital broadcast service. That is, it is possible to provide a technology for more suitably transmitting or receiving an advanced digital broadcast service.

[0372] Although the embodiment of the present invention has been described above using Examples 1 to 3, the configuration for realizing the technology of the present invention is not limited to the above examples, and various modified examples are possible. For example, it is possible to replace a part of the configuration of one example with the configuration of another example, and it is also possible to add the configuration of another example to the configuration of one example. All of these belong to the scope of the present invention. Furthermore, the numerical values, messages, etc. appearing in the text and figures are merely examples, and the effect of the present invention is not impaired even if different ones are used.

[0373] The functions of the present invention described above may be realized in part or in whole by hardware, for example by designing them as integrated circuits. They may also be realized by software, with a microprocessor unit or the like interpreting and executing an operating program that realizes each function. Hardware and software may also be used in combination.

[0374] The software for controlling the broadcast receiving device 100 may be stored in the ROM 103 and / or the storage unit 110 of the broadcast receiving device 100 beforehand at the time of product shipment. The software may be acquired from another application server 500 on the Internet 200 via the LAN communication unit 121 after product shipment. The software stored in a memory card, optical disk, etc. may be acquired via the extended interface unit 124. Similarly, the software for controlling the mobile information terminal 700 may be stored in the ROM 703 and / or the storage unit 710 of the mobile information terminal 700 beforehand at the time of product shipment. The software may be acquired from another application server 500 on the Internet 200 via the LAN communication unit 721 or the mobile telephone network communication unit 722 after product shipment. The software stored in a memory card, optical disk, etc. may be acquired via the extended interface unit 724.

[0375] In addition, the control lines and information lines shown in the diagram are those considered necessary for explanation, and do not necessarily show all the control lines and information lines on the product. In reality, it can be considered that almost all components are connected to each other. [Explanation of symbols]

[0376] 100: broadcast receiving device, 101: main control unit, 102: system bus, 103: ROM, 104: RAM, 110: storage (accumulation) unit, 121: LAN communication unit, 124: expansion interface unit, 125: digital interface unit, 130C, 130T, 130L, 130B: tuner / demodulation unit, 140S, 140U: decoder unit, 180: operation input unit, 191: video selection unit, 192: monitor unit, 193: video output unit, 19 4: audio selection unit, 195: speaker unit, 196: audio output unit, 180R: remote controller, 200, 200T, 200L, 200B: antennas, 300, 300T, 300L: radio tower, 400C: cable television station head end, 400: broadcasting station server, 500: service provider server, 600: mobile telephone communication server, 600B: base station, 700: mobile information terminal, 800: Internet, 800R: router device.

Claims

[Claim 1] A broadcast receiving device that performs time management using an NTP included in a broadcast wave transmitted from a broadcast transmission system, A receiving unit for receiving the broadcast wave; a first NTP system clock for synchronizing video and audio presentation; a second NTP system clock for synchronizing the display of subtitles; Equipped with the receiving unit receives a first descriptor indicating a type of leap second adjustment processing for the time used for presenting video and audio, and a second descriptor indicating a type of leap second adjustment processing for the time used for displaying subtitles, and when the value of the first descriptor and the value of the second descriptor indicate different values, performs, for leap second adjustment in the first NTP system clock, leap second adjustment processing indicated by the value of the second descriptor rather than leap second adjustment processing indicated by the value of the first descriptor; Broadcast receiving equipment.

Images