System

Abstract

To provide a technique of suitably transmitting or receiving a sophisticated digital broadcast service.SOLUTION: A system comprises: a tuner which receives a transmission wave storing information on an injection level; and a control unit. The control unit identifies that re-scanning processing that is setting processing of broadcast reception by the tuner is required, by using the information on the injection level included in the transmission wave received by the tuner.SELECTED DRAWING: Figure 2A

Description

Technical Field

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

Background Art

[0002] Instead of conventional analog broadcast services, digital broadcast services have been started in various countries since the late 1990s. Digital broadcast services have realized improvements in broadcast quality using error correction technology, multi-channeling and HD (High Definition) using compression encoding technology, multimedia of services using BML (Broadcast Markup Language) and HTML5 (Hyper Text Markup Language version 5), and the like.

[0003] In recent years, for the purpose of further improving frequency use efficiency, higher resolution, and higher functionality, in each country, studies on advanced digital broadcast systems have been underway.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] More than 10 years have passed since the start of the current digital broadcast service, and broadcast reception devices capable of receiving the current digital broadcast service have been sufficiently popularized. Therefore, when starting the advanced digital broadcast service currently under consideration, it is necessary to consider compatibility with the current digital broadcast service. That is, it is preferable to realize UHD (Ultra High Definition) of video signals while maintaining the viewing environment of the current digital broadcast service.

[0006] As a technology for realizing UHD broadcasting in a digital broadcasting service, there is a system described in Patent Document 1. However, the system described in Patent Document 1 is for replacing the current digital broadcasting and does not consider maintaining the viewing environment of the current digital broadcasting service.

[0007] An object of the present invention is to provide a technology for more suitably transmitting or receiving a higher-functional advanced digital broadcasting service in consideration of compatibility with the current digital broadcasting service.

Means for Solving the Problem

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

[0009] For example, a system including a transmission device that transmits a transmission wave of digital broadcasting via a radio tower and a reception device that receives the transmission wave of the digital broadcasting, wherein the transmission device transmits a transmission wave in which information regarding an injection level is stored via the radio tower, and the reception device includes a tuner that receives the transmission wave in which the information regarding the injection level is stored, the information regarding the injection level is information based on a change in a difference in signal levels of a plurality of transmission waves having different signal levels transmitted at the same frequency, and a control unit, and the control unit detects that the information regarding the injection level included in the transmission wave received by the tuner has been changed in a direction in which the level becomes smaller, thereby identifying that a rescan process, which is a broadcast reception setting process by the tuner, is necessary, and when the channel identified as requiring the rescan process does not exist in the service list, the rescan process is executed, and when the channel identified as requiring the rescan process exists in the service list, control is performed so as not to execute the rescan process.

Effects of the Invention

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

Brief Description of the Drawings

[0011]

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Embodiments for Carrying Out the Invention

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

[0013] (Example 1) [System Configuration] FIG. 1 is a system configuration diagram showing an example of the configuration of a broadcast system.

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

[0015] The broadcast receiving apparatus 100 is a television receiver having a reception function for advanced digital broadcast services. The broadcast receiving apparatus 100 may further have a reception function for existing digital broadcast services. Furthermore, it is possible to support a broadcast communication cooperation system that combines functions using a broadband network with digital broadcast services (existing digital broadcast services or advanced digital broadcast services), such as obtaining additional content via the broadband network, performing arithmetic processing in a server device, and presentation processing through cooperation with a portable terminal device, in combination with the digital broadcast services. The broadcast receiving apparatus 100 receives digital broadcast waves transmitted from a radio tower 300 via an antenna 200. The digital broadcast waves may be directly transmitted from the radio tower 300 to the antenna 200, or may be transmitted via a broadcast satellite, a communication satellite, etc. (not shown). The broadcast receiving apparatus 100 may receive a broadcast signal retransmitted by a cable television station via a cable line or the like. Also, the broadcast receiving apparatus 100 can be connected to the Internet 800 via a router device 800R, and can transmit and receive data through communication with each server device on the Internet 800.

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

[0017] The radio tower 300 is broadcast equipment of a broadcasting station, and transmits digital broadcast waves including various control information related to digital broadcast services and content data (such as video content and audio content) of broadcast programs. The broadcasting station also has a broadcasting station server 400. The broadcasting station server 400 stores content data of broadcast programs and metadata such as program titles, program IDs, program summaries, performers, and broadcast dates of each broadcast program. The broadcasting station server 400 provides the content data and metadata to service providers based on contracts. The provision of content data and metadata to service providers is carried out through an API (Application Programming Interface) provided by the broadcasting station server 400.

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

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

[0020] [Hardware Configuration of Broadcast Receiving Device] FIG. 2A is a block diagram showing an example of the internal configuration of the broadcast receiving device 100.

[0021] The broadcast receiving device 100 includes 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, a voice selection unit 194, a speaker unit 195, and a voice output unit 196.

[0022] The main control unit 101 is a microprocessor unit that controls the entire broadcast receiving device 100 according to 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 that stores basic operation programs such as an operating system and other operation programs. For example, a rewritable ROM such as an EEPROM (Electrically Erasable Programmable ROM) or a flash ROM is used. Further, the ROM 103 stores operation setting values and the like necessary for the operation of the broadcast receiving apparatus 100. The RAM (Random Access Memory) 104 serves as a work area when executing basic operation programs and other operation programs. The ROM 103 and the RAM 104 may be integrally configured with the main control unit 101. Further, the ROM 103 may use a partial storage area in the storage (accumulation) unit 110 instead of having an independent configuration as shown in FIG. 2A.

[0024] The storage (accumulation) unit 110 stores operation programs, operation setting values, personal information of users of the broadcast receiving apparatus 100, and the like of the broadcast receiving apparatus 100. Further, it is possible to store operation programs downloaded via the Internet 800 and various data created by the operation programs. Further, it is also possible to store contents such as moving images, still images, and audio obtained from a broadcast wave or downloaded via the Internet 800. A partial area of the storage (accumulation) unit 110 may replace all or part of the functions of the ROM 103. Further, the storage (accumulation) unit 110 needs to retain the stored information even when no external power is supplied to the broadcast receiving apparatus 100. Therefore, for example, semiconductor element memories such as flash ROMs and SSDs (Solid State Drives), magnetic disk drives such as HDDs (Hard Disc Drives), and the like are used.

[0025] Note that the respective operation programs stored in the ROM 103 and the storage (accumulation) unit 110 can be added, updated, and functionally expanded by download processing from each server device on the Internet 800 or from a broadcast wave.

[0026] The LAN communication unit 121 is connected to the Internet 800 via the router device 800R and transmits and receives data with each server device and other communication devices on the Internet 800. It also acquires content data (or a part thereof) of a program 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. Further, the broadcast receiving device 100 may further include other communication units such as a Bluetooth (registered trademark) communication unit, an NFC communication unit, and an infrared communication unit.

[0027] The first tuner / demodulator unit 130C, the second tuner / demodulator unit 130T, the third tuner / demodulator unit 130L, and the fourth tuner / demodulator unit 130B each perform a channel selection process (channel selection) by receiving a broadcast wave of a digital broadcast service and tuning to a channel of a predetermined service based on the control of the main control unit 101. Further, it performs demodulation processing of the modulated wave of the received signal, waveform shaping processing, etc., as well as reconstruction processing of the frame structure and hierarchical structure, energy despreading processing, error correction decoding processing, etc., to reproduce a packet stream. It also extracts and decodes a transmission TMCC (Transmission Multiplexing Configuration Control) signal from the received signal.

[0028] Note that the first tuner / demodulator unit 130C can receive the digital broadcast wave of the current terrestrial digital broadcast service received by the antenna 200C, which is an antenna for receiving the current terrestrial digital broadcast. Also, the first tuner / demodulator unit 130C can input a broadcast signal of one of the horizontal (H) polarization signal and the vertical (V) polarization signal of the polarization - dual terrestrial digital broadcast described later, and demodulate a segment of the layer that adopts the same modulation method as the current terrestrial digital broadcast service. Further, the first tuner / demodulator unit 130C can input a broadcast signal of the hierarchical division multiplex terrestrial digital broadcast described later, and demodulate a layer that adopts the same modulation method as the current terrestrial digital broadcast service. The second tuner / demodulator unit 130T inputs the digital broadcast wave of the advanced terrestrial digital broadcast service received by the antenna 200T, which is an antenna for receiving the polarization - dual terrestrial digital broadcast, via the conversion unit 201T. The third tuner / demodulator unit 130L inputs the digital broadcast wave of the advanced terrestrial digital broadcast service received by the antenna 200L, which is an antenna for receiving the hierarchical division multiplex terrestrial digital broadcast, via the conversion unit 201L. The fourth tuner / demodulator unit 130B inputs the digital broadcast wave of the advanced BS (Broadcasting Satellite) digital broadcast service or the advanced CS (Communication Satellite) digital broadcast service received by the antenna 200B, which is an antenna for BS / CS shared reception, via the conversion unit 201B.

[0029] Note that the expression "tuner / demodulator unit" means a component having a tuner function and a demodulator function.

[0030] Also, the antenna 200C, the antenna 200T, the antenna 200L, the antenna 200B, the conversion unit 201T, the conversion unit 201L, and the conversion unit 201B do not constitute a part of the broadcast receiving apparatus 100, but belong to the equipment side such as the building where the broadcast receiving apparatus 100 is installed.

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

[0032] In addition, although the details of dual-polarization terrestrial digital broadcasting (advanced terrestrial digital broadcasting adopting the dual-polarization transmission method) will be described later, it is a broadcast signal of a terrestrial digital broadcasting service capable of transmitting video with a pixel count exceeding 1920 horizontal pixels × 1080 vertical pixels as the maximum resolution. Dual-polarization terrestrial digital broadcasting is terrestrial digital broadcasting that uses a plurality of polarizations, namely horizontal (H) polarization and vertical (V) polarization. In both polarizations of the plurality of polarizations, in a part of the segmented segments, it transmits a terrestrial digital broadcasting service capable of transmitting video with a pixel count exceeding 1920 horizontal pixels × 1080 vertical pixels as the maximum resolution.

[0033] In the description of each embodiment of the present invention, when the expression "a plurality of polarizations" is used for dual-polarization terrestrial digital broadcasting, unless otherwise specified, it means two polarizations, namely horizontal (H) polarization and vertical (V) polarization. Also, when simply using the expression "polarization", it means "polarization signal". Also, in one or both of the plurality of polarizations, in a part of the segmented segments, the above-mentioned current terrestrial digital broadcasting that transmits video with 1920 horizontal pixels × 1080 vertical pixels as the maximum resolution can be transmitted in the same modulation method. That is, in dual-polarization terrestrial digital broadcasting, in different segments of the plurality of polarizations of each embodiment of the present invention, the current terrestrial digital broadcasting service that transmits video with 1920 horizontal pixels × 1080 vertical pixels as the maximum resolution and the terrestrial digital broadcasting service capable of transmitting video with a pixel count exceeding 1920 horizontal pixels × 1080 vertical pixels as the maximum resolution can be transmitted simultaneously.

[0034] Also, although the details of hierarchical division multiplex terrestrial digital broadcasting (advanced terrestrial digital broadcasting adopting the hierarchical division multiplex transmission method) will be described later, it is a broadcast signal of a terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels × 1080 vertical pixels. Hierarchical division multiplex terrestrial digital broadcasting multiplexes a plurality of digital broadcast signals with different signal levels. Note that digital broadcast signals with different signal levels mean that the transmission power of the digital broadcast signals is different. The hierarchical division multiplex terrestrial digital broadcasting of each embodiment of the present invention uses, as the plurality of digital broadcast signals with different signal levels, the broadcast signal of the current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels × 1080 vertical pixels and the broadcast signal of a terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels × 1080 vertical pixels, and can be transmitted by hierarchical multiplexing in the frequency band of the same physical channel. That is, in the hierarchical division multiplex terrestrial digital broadcasting of each embodiment of the present invention, the current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels × 1080 vertical pixels and a terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels × 1080 vertical pixels can be transmitted simultaneously in a plurality of hierarchical levels with different signal levels.

[0035] Note that the broadcast receiving apparatus in each embodiment of the present invention only needs to be configured to be able to preferably receive advanced digital broadcasting, and it is not essential 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. Also, in order to realize more advanced functions, in addition to one of the second tuner / demodulation unit 130T or the third tuner / demodulation unit 130L, one or more of the above four tuner / demodulation units may be provided together.

[0036] Also, the antenna 200C, the antenna 200T, and the antenna 200L may be used interchangeably as appropriate. Also, among the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, and the third tuner / demodulation unit 130L, a plurality of tuner / demodulation units may be used interchangeably (or integrated) as appropriate.

[0037] The first decoder unit 140S and the second decoder unit 140U each input a packet stream output from the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, the third tuner / demodulation unit 130L, or the fourth tuner / demodulation unit 130B, or a packet stream acquired from each server device on the Internet 800 via the LAN communication unit 121. The packet streams input by the first decoder unit 140S and the second decoder unit 140U may be packet streams in formats such as MPEG (Moving Picture Experts Group)-2 TS (Transport Stream), MPEG-2 PS (Program Stream), TLV (Type Length Value), MMT (MPEG Media Transport), and the like.

[0038] The first decoder unit 140S and the second decoder unit 140U each perform conditional access (CA) processing, multiplex separation processing for separating and extracting video data, audio data, various information data, etc. from the packet stream based on various control information included in the packet stream, decoding processing of video data and audio data, acquisition of program information and EPG (Electronic Program Guide) generation processing, reproduction processing of data broadcast screens and multimedia data, and the like. Also, a process of superimposing the generated EPG and the reproduced multimedia data on 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 processes such as appropriate selection and / or superimposition based on the control of the main control unit 101. Also, the video selection unit 191 appropriately performs scaling processing, superimposition processing of OSD (On Screen Display) data, and the like. The monitor unit 192 is a display device such as a liquid crystal panel, for example, 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 apparatus 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 processes such as appropriate selection and / or mixing based on 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 to provide it to the user of the broadcast receiving apparatus 100. The audio output unit 196 is an audio output interface that outputs the audio data selected and / or mixed by the audio selection unit 194 to the outside.

[0041] The digital interface unit 125 is an interface that outputs or inputs a packet stream including encoded digital video data and / or digital audio data. The digital interface unit 125 can directly output the packet streams input from the first tuner / demodulator unit 130C, the second tuner / demodulator unit 130T, the third tuner / demodulator unit 130L, and the fourth tuner / demodulator unit 130B by the first decoder unit 140S and the second decoder unit 140U. Also, it may be controlled to input the packet stream input from the outside via the digital interface unit 125 to the first decoder unit 140S and the second decoder unit 140U, or store it in the storage (accumulation) unit 110. Alternatively, it may output the video data and audio data separated and extracted by the first decoder unit 140S and the second decoder unit 140U. Also, it may be controlled to input the video data and audio data input from the outside via the digital interface unit 125 to the first decoder unit 140S and the second decoder unit 140U, or store it in the storage (accumulation) unit 110.

[0042] The extended interface unit 124 is a group of interfaces for expanding the functions of the broadcast receiving apparatus 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 performs input of an analog video signal / audio signal from an external video / audio output device, output of an analog video signal / audio signal to an external video / audio input device, etc. The USB interface connects to a PC or the like to perform data transmission and reception. It may connect an HDD to record broadcast programs and other content data. Also, it may connect a keyboard and other USB devices. The memory interface connects a memory card and other memory media to perform data transmission and reception.

[0043] The operation input unit 180 is an instruction input unit that inputs operation instructions for the broadcast receiving apparatus 100, and includes a remote control receiver that receives commands transmitted from a remote controller (not shown) and operation keys arranged with button switches. Either one of them may be used. Further, the operation input unit 180 can be replaced with a touch panel or the like disposed over the monitor unit 192. It may also be replaced with a keyboard or the like connected to the extension interface unit 124. The remote controller can be replaced with a portable information terminal 700 having a remote control command transmission function.

[0044] Note that when the broadcast receiving apparatus 100 is a television receiver or the like, the video output unit 193 and the audio output unit 196 are not essential components. Further, the broadcast receiving apparatus 100 may be an optical disk drive recorder such as a DVD (Digital Versatile Disc) recorder, a magnetic disk drive recorder such as an HDD recorder, an STB (Set Top Box), or the like. It may also be a PC (Personal Computer), a tablet terminal, or the like having a reception function for digital broadcast services. When the broadcast receiving apparatus 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 operations as those of a television receiver or the like become possible.

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

[0046] The channel selection / detection unit 131C inputs the current digital broadcast wave received by the antenna 200C and performs channel selection based on a 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 for the control of each subsequent process. 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 and performs demodulation processing including frequency deinterleaving, time deinterleaving, carrier demapping processing, etc. The demodulation unit 133C may be further capable of supporting a modulation method different from the above-described modulation methods.

[0048] The stream playback unit 134C performs hierarchical division processing, inner code error correction processing such as Viterbi decoding, energy despreading processing, stream playback processing, outer code error correction processing such as RS (Reed Solomon) decoding, etc. Note that as the error correction processing, those different from the above-described methods may be used. Also, the packet stream reproduced and output by the stream playback unit 134C is, for example, MPEG-2 TS or the like. It may be a packet stream of other formats.

[0049] Figure 2C is a block diagram showing an example of the detailed configuration of the second tuner / demodulation unit 130T.

[0050] The channel selection / detection unit 131H receives the horizontal (H) polarization signal of the digital broadcast wave received by the antenna 200T and performs channel selection based on the channel selection control signal. The channel selection / detection unit 131V receives the vertical (V) polarization signal of the digital broadcast wave received by the antenna 200T and performs channel selection based on the 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. That is, it is also possible to control the channel selection / detection unit 131H and the channel selection / detection unit 131V as one channel selection / detection unit to select one channel of the digital broadcast service transmitted using both horizontal and vertical polarizations. It is also possible to control the channel selection / detection unit 131H and the channel selection / detection unit 131V as two independent channel selection / detection units to select two different channels of the digital broadcast service transmitted using only the horizontal polarization (or only the vertical polarization) respectively.

[0051] Note that the horizontal (H) polarization signal and the vertical (V) polarization signal received by the second tuner / demodulation unit 130T of the broadcast receiving apparatus in each embodiment of the present invention may be polarization signals from broadcast waves with polarization directions that are approximately 90 degrees different, and the configurations related to the horizontal (H) polarization signal, the vertical (V) polarization signal, and their reception described below may be reversed.

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

[0053] The demodulation unit 133H and the demodulation unit 133V each receive 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 or the like, and perform demodulation processing including frequency deinterleaving, time deinterleaving, carrier demapping processing, etc. The demodulation unit 133H and the demodulation unit 133V may be further compatible with modulation methods different from the above-described respective modulation methods.

[0054] The stream playback units 134H and 134V each perform hierarchical division processing, inner code error correction processing such as Viterbi decoding or LDPC (Low Density Parity Check) decoding, energy despreading processing, stream playback processing, outer code error correction processing such as RS decoding or BCH decoding, etc. Note that, as the error correction processing, those different from the above-described respective methods may be used. Also, the packet stream reproduced and output by the stream playback unit 134H is, for example, MPEG-2 TS or the like. The packet stream reproduced and output by the stream playback unit 134V is, for example, TLV including MPEG-2 TS or MMT packet stream. Each may be a packet stream of other formats.

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

[0056] The channel selection / detection unit 131L receives the digital broadcast wave subjected to Layered Division Multiplexing (LDM) processing from the antenna 200L, and performs channel selection based on the channel selection control signal. The digital broadcast wave subjected to the layered division multiplexing process may be used for transmitting modulated waves of the upper layer (UL) and modulated waves of the lower layer (LL) for different digital broadcast services (or different channels of the same broadcast service). Further, the modulated wave of the upper layer is output to the demodulation unit 133S, and the modulated wave of the lower layer is output to the demodulation unit 133L, respectively.

[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 channel selection / detection unit 131L, extracts the TMCC signal, and acquires various TMCC information. The signal input to the TMCC decoding unit 132L may be only one of the modulated wave of the upper layer and the modulated wave of the lower layer.

[0058] Since the demodulation unit 133S and the demodulation unit 133L perform the same operations as the demodulation unit 133H and the demodulation unit 133V, detailed descriptions thereof are omitted. Further, since the stream playback unit 134S and the stream playback unit 134L perform the same operations as the stream playback unit 134H and the stream playback unit 134V, respectively, detailed descriptions thereof are omitted.

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

[0060] The channel selection / detection unit 131B receives the digital broadcast wave of the high-definition BS digital broadcast service or the high-definition CS digital broadcast service received by the antenna 200B, and performs channel selection based on the channel selection control signal. Since other operations are the same as those of the channel selection / detection unit 131H and the channel selection / detection unit 131V, detailed descriptions thereof are omitted. Further, the TMCC decoding unit 132B, the demodulation unit 133B, and the stream playback unit 134B also perform the same operations as the TMCC decoding unit 132H, the TMCC decoding unit 132V, the demodulation unit 133H, the demodulation unit 133V, and the stream playback unit 134V, respectively, and thus detailed descriptions thereof are omitted.

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

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

[0063] The multiplex separation unit 143S is a stream decoder, and separates and extracts video data, audio data, character super data, subtitle data, program information data, etc. based on various control information included in the input packet stream. The separated and extracted video data is distributed to the video decoder 145S, the separated and extracted audio data is distributed to the audio decoder 146S, and the separated and extracted character super data, subtitle data, program information data, etc. are distributed to the data decoder 144S. A packet stream (for example, MPEG-2 PS or the like) acquired from a server device on the Internet 800 via the LAN communication unit 121 may be input to the multiplex separation unit 143S. Further, the multiplex separation unit 143S can output the packet stream input from the first tuner / demodulator unit 130C, the second tuner / demodulator unit 130T, or the third tuner / demodulator unit 130L to the outside via the digital interface 125, and can input the packet stream acquired from the outside via the digital interface 125.

[0064] The video decoder 145S performs processes such as decoding of video information subjected to compression encoding, colorimetry conversion processing, dynamic range conversion processing, etc. on the video data input from the multiplex separation unit 143S. Further, it performs processes such as resolution conversion (up / down conversion) based on the control of the main control unit 101, and outputs video data at resolutions such as UHD (3840 horizontal pixels × 2160 vertical pixels), HD (1920 horizontal pixels × 1080 vertical pixels), SD (720 horizontal pixels × 480 vertical pixels), etc. as appropriate. Video data output at other resolutions may also be performed. The audio decoder 146S performs processes such as decoding of audio information subjected to compression encoding. Further, it performs processes such as downmix processing based on the control of the main control unit 101, and outputs audio data with the number of channels such as 22.2ch, 7.1ch, 5.1ch, 2ch, etc. Note that a plurality of video decoders 145S and audio decoders 146S may be provided in order to perform a plurality of decoding processes of video data and audio data simultaneously.

[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, controlling a cooperation application based on a broadcast communication cooperation function, etc. The data decoder 144S has a BML browser function for executing a BML document, and the data broadcast screen generation process is executed by the BML browser function. Further, the data decoder 144S performs processes such as decoding character super data to generate character super information, decoding subtitle data to generate subtitle information, etc.

[0066] The overlapping section 147S, the overlapping section 148S, and the overlapping section 149S each perform an overlapping process of video data output from the video decoder 145S and EPG, data broadcast screens, etc. output from the data decoder 144S. The synthesizing section 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 selection section 150S performs resolution selection of video data based on the control of the main control section 101. Note that the functions of the overlapping section 147S, the overlapping section 148S, the overlapping section 149S, and the selection section 150S may be integrated with the video selection section 191. The function of the synthesizing section 151S may be integrated with the audio selection section 194.

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

[0068] The selection section 141U selects and outputs one from the packet stream input from the second tuner / demodulator section 130T, the packet stream input from the third tuner / demodulator section 130L, and the packet stream input from the fourth tuner / demodulator section 130B based on the control of the main control section 101. The packet streams input from the second tuner / demodulator section 130T, the third tuner / demodulator section 130L, and the fourth tuner / demodulator section 130B are, for example, MMT packet streams or TLVs including MMT packet streams. A packet stream in MPEG-2 TS format adopting HEVC (High Efficiency Video Coding) or the like for the video compression method may also be used. The CA descrambler 142U performs a process of releasing the encryption algorithm of a predetermined scrambling method based on various control information related to conditional access superimposed on the packet stream.

[0069] The multi-separator 143U is a stream decoder that separates and extracts video data, audio data, character super data, subtitle data, program information data, etc. based on various control information contained in the input packet stream. The separated and extracted video data is distributed to the video decoder 145U, the separated and extracted audio data is distributed to the audio decoder 146U, and the separated and extracted character super data, subtitle data, program information data, etc. are distributed to the multimedia decoder 144U. A packet stream (e.g., MPEG-2 PS, MMT packet stream, etc.) obtained from a server device on the Internet 800 via the LAN communication unit 121 may be input to the multi-separator 143U. Also, the multi-separator 143U can output the packet stream input from the second tuner / demodulator 130T, the third tuner / demodulator 130L, or the fourth tuner / demodulator 130B to the outside via the digital interface 125, and can input a packet stream obtained from the outside via the digital interface 125.

[0070] The multimedia decoder 144U performs processes such as generating an EPG based on program information data, generating a multimedia screen based on multimedia data, and controlling a cooperation application based on a broadcast communication cooperation function. The multimedia decoder 144U has an HTML browser function for executing HTML documents, and the multimedia screen generation process is executed by the HTML browser function.

[0071] The video decoder 145U, the audio decoder 146U, the superimposing unit 147U, the superimposing unit 148U, the superimposing unit 149U, the synthesizing unit 151U, and the selecting unit 150U are each components having the same functions as the video decoder 145S, the audio decoder 146S, the superimposing unit 147S, the superimposing unit 148S, the superimposing unit 149S, the synthesizing unit 151S, and the selecting unit 150S. If the S at the end of the reference numerals in the description of the video decoder 145S, the audio decoder 146S, the superimposing unit 147S, the superimposing unit 148S, the superimposing unit 149S, the synthesizing unit 151S, and the selecting unit 150S in FIG. 2F is replaced with U, it becomes the description of each of the video decoder 145U, the audio decoder 146U, the superimposing unit 147U, the superimposing unit 148U, the superimposing unit 149U, the synthesizing unit 151U, and the selecting unit 150S in FIG. 2G, so a separate detailed description is omitted.

[0072] [Software Configuration of Broadcast Receiver] FIG. 2H is a software configuration diagram of the broadcast receiver 100, showing an example of the software configuration in the storage (accumulation) unit 110 (or ROM 103, the same applies hereinafter) and the RAM 104. The storage (accumulation) unit 110 stores a basic operation program 1001, a reception function program 1002, a browser program 1003, a content management program 1004, and other operation programs 1009. Further, the storage (accumulation) unit 110 is assumed to include 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 and cooperating with external portable terminal devices, server devices, etc., and various information storage areas 1019 for storing various other information.

[0073] The basic operation program 1001 stored in the storage (accumulation) unit 110 is expanded in the RAM 104, and further, the main control unit 101 executes the expanded basic operation program, thereby constituting the basic operation control unit 1101. Also, the reception function program 1002, the browser program 1003, and the content management program 1004 stored in the storage (accumulation) unit 110 are each expanded in the RAM 104, and further, the main control unit 101 executes each of the expanded operation programs, thereby constituting the reception function control unit 1102, the browser engine 1103, and the content management unit 1104. Also, the RAM 104 is provided with a temporary storage area 1200 that temporarily holds the data created when each operation program is executed, as needed.

[0074] Note that hereinafter, for the sake of simplicity of explanation, the process of the main control unit 101 expanding and executing the basic operation program 1001 stored in the storage (accumulation) unit 110 in the RAM 104 to control each operation block will be described as if the basic operation control unit 1101 controls each operation block. The same description will be made for 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 reception apparatus 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 hierarchical 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 multiplex separation processing (stream decoding processing), video data decoding processing, audio data decoding processing, etc. in the first decoder unit 140S, the second decoder unit 140H, etc. The multimedia (MM) data playback unit 1102d mainly controls BML data playback processing, character super data decoding processing, subtitle data decoding processing, control processing of communication cooperation applications, etc. in the first decoder unit 140S, HTML data playback processing, multimedia screen generation processing, control processing of communication cooperation applications, etc. in the second decoder unit 140H, etc. The EPG generation unit 1102e mainly controls EPG generation processing and display processing of the generated EPG in the first decoder unit 140S and the second decoder unit 140H. The presentation processing unit 1102f controls colorimetry conversion processing, dynamic range conversion processing, resolution conversion processing, audio downmixing processing, etc. in the first decoder unit 140S and the second decoder unit 140H, and also controls the video selection unit 191, the audio selection unit 194, etc.

[0076] The BML browser 1103a and the HTML browser 1103b of the browser engine 1103 interpret BML documents and HTML documents during the aforementioned BML data playback processing and HTML data playback processing, and perform data broadcast screen generation processing and multimedia screen generation processing.

[0077] The content management unit 1104 performs time schedule management and execution control when making recording reservations and viewing reservations for broadcast programs, and also performs expiration date management of the linked applications obtained based on copyright management and broadcast communication cooperation functions when outputting broadcast programs, recorded programs, etc. from the digital I / F 125, LAN communication unit 121, etc.

[0078] Each of the above operation programs may be stored in advance in the storage (accumulation) unit 110 and / or ROM 103 at the time of product shipment. It may also be obtained from a server device on the Internet 800 via the LAN communication unit 121, etc. after product shipment. Further, each of the above operation programs stored in a memory card, optical disk, etc. may be obtained via the expansion interface unit 124, etc. It may also be newly obtained or updated via a broadcast wave.

[0079] [Configuration of Broadcast Station Server] Figure 3A shows an example of the internal configuration of the broadcast station server 400. The broadcast station server 400 is composed 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 according to 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 the basic operation program 4001, the content management / delivery program 4002, and the content transmission program 4003, and further includes a content data storage area 4011 and a metadata storage area 4012. The content data storage area 4011 stores the content data of each broadcast program broadcast by the broadcast station. The metadata storage area 4012 stores metadata such as the program title, program ID, program summary, cast, broadcast date and time, etc. of each of the above broadcast programs.

[0082] Also, the basic operation program 4001, content management / delivery program 4002, and content delivery program 4003 stored in the storage unit 410 are respectively expanded in the RAM 404, and further, the main control unit 401 executes the expanded basic operation program, content management / delivery program, and content delivery program, thereby constituting the basic operation control unit 4101, content management / delivery control unit 4102, and content delivery control unit 4103.

[0083] In the following, for the sake of simplicity, the process in which the main control unit 401 expands and executes the basic operation program 4001 stored in the storage unit 410 in the RAM 404 to control each operation block will be described as if the basic operation control unit 4101 controls each operation block. The same description will be made for other operation programs.

[0084] The content management / delivery control unit 4102 controls the management of content data, metadata, etc. stored in the content data storage area 4011 and metadata storage area 4012, and the control when providing the content data, metadata, etc. to a service provider based on a contract. Further, when providing content data, metadata, etc. to the service provider, the content management / delivery control unit 4102 also performs authentication processing, etc. of the service provider server 500 as necessary.

[0085] The content delivery control unit 4103 performs time schedule management, etc. when sending out a stream including content data of a broadcast program stored in the content data storage area 4011, program title of the broadcast program, program ID, copy control information of the program content, etc. stored in the metadata storage area 4012 via the digital broadcast signal sending unit 460.

[0086] The LAN communication unit 421 is connected to the Internet 800 and communicates with the service provider server 500 on the Internet 800 and other communication devices. The LAN communication unit 421 includes an encoding circuit, a decoding circuit, and the like. The digital broadcast signal transmission unit 460 performs processing such as modulation on a stream composed of content data of each broadcast program, program information data, etc. stored in the content data storage area 4011, and transmits it as a digital broadcast wave via the radio tower 300.

[0087] [Configuration of Service Provider Server] Figure 3B shows an example of the internal configuration of the service provider server 500. The service provider server 500 is composed of a main control unit 501, a system bus 502, a RAM 504, and 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 according to 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 broadcasting station server 400, or content produced by the service provider and metadata related to the content. The application storage area 5013 stores applications (operation programs and / or various data, etc.) required for realizing each service of the broadcast communication cooperation system for distribution in response to requests from each television receiver.

[0090] Also, the basic operation program 5001, content management / delivery program 5002, and application management / distribution program 5003 stored in the storage unit 510 are each expanded in the RAM 504, and further, the main control unit 501 executes the expanded basic operation program, content management / delivery program, and application management / distribution program, thereby constituting a basic operation control unit 5101, a content management / delivery control unit 5102, and an application management / distribution control unit 5103.

[0091] Note that hereinafter, for the sake of simplicity, the process of the main control unit 501 expanding and executing the basic operation program 5001 stored in the storage unit 510 in the RAM 504 to control each operation block will be described as if the basic operation control unit 5101 controls each operation block. The same description will be made for other operation programs.

[0092] The content management / delivery control unit 5102 performs acquisition of content data, metadata, etc. from the broadcasting station server 400, management of content data, metadata, etc. stored in the content data storage area 5011 and the metadata storage area 5012, and control of distribution of the content data, metadata, etc. to each television receiver. Also, the application management / distribution control unit 5103 performs management of each application stored in the application storage area 5013 and control when distributing each application in response to requests from each television receiver. Further, when distributing each application to each television receiver, the application management / distribution control unit 5103 also performs authentication processing, etc. of the television receiver as necessary.

[0093] The LAN communication unit 521 is connected to the Internet 800 and communicates with the broadcasting station server 400 and other communication devices on the Internet 800. It also communicates with the broadcast receiving device 100 and the portable information terminal 700 via the router device 800R. The LAN communication unit 521 includes a coding circuit, a decoding circuit, etc.

[0094] [Broadcast Wave of Digital Broadcasting] Here, an example of the broadcast wave of digital broadcasting received by the broadcast receiving apparatus according to an embodiment of the present invention will be described.

[0095] The broadcast receiving apparatus 100 is capable of receiving a terrestrial digital broadcast service that shares at least some specifications with the ISDB-T (Integrated Services Digital Broadcasting for Terrestrial Television Broadcasting) system. Specifically, the polarization-duplex terrestrial digital broadcast that can be received by the second tuner / demodulator unit 130T is an advanced terrestrial digital broadcast that shares some specifications with the ISDB-T system. Also, the hierarchical division multiplex terrestrial digital broadcast that can be received by the third tuner / demodulator unit 130L is an advanced terrestrial digital broadcast that shares some specifications with the ISDB-T system. Note that the current terrestrial digital broadcast that can be received by the first tuner / demodulator unit 130C is a terrestrial digital broadcast of the ISDB-T system. Also, the advanced BS digital broadcast and the advanced CS digital broadcast that can be received by the fourth tuner / demodulator unit 130B are digital broadcasts different from the ISDB-T system.

[0096] Here, the polarization-duplex terrestrial digital broadcast and the hierarchical division multiplex terrestrial digital broadcast according to the present embodiment, like the ISDB-T system, adopt OFDM (Orthogonal Frequency Division Multiplexing), which is one of the multi-carrier systems, as the transmission system. Since OFDM is a multi-carrier system, the symbol length is long, and it is effective to add a redundant portion in the time axis direction called a guard interval, and it is possible to reduce the influence of multi-path within the range of the guard interval. For this reason, it is possible to realize an SFN (Single Frequency Network), and effective use of frequency becomes possible.

[0097] The polarization - dual - use terrestrial digital broadcast and the hierarchical division multiplex terrestrial digital broadcast according to this embodiment divide the OFDM carriers into groups called segments, similar to the ISDB - T system. As shown in Fig. 4A, one channel bandwidth of the digital broadcast service is composed of 13 segments. The center of the bandwidth is set as the position of segment 0, and segment numbers (0 - 12) are sequentially assigned above and below this. The channel coding of the polarization - dual - use terrestrial digital broadcast and the hierarchical division multiplex terrestrial digital broadcast according to this embodiment is performed in units of OFDM segments. Therefore, it is possible to define hierarchical transmission. For example, within the bandwidth of one television channel, some OFDM segments can be assigned to fixed - reception services and the 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. Note that the number of layers can be arbitrarily set. For example, it can be set up to a maximum of 3 layers. Fig. 4B shows an example of the hierarchical assignment of OFDM segments when the number of layers is 3 or 2. In the example of Fig. 4B(1), the number of layers is 3. Layer A is composed of 1 segment (segment 0), layer B is composed of 7 segments (segments 1 - 7), and layer C is composed of 5 segments (segments 8 - 12). In the example of Fig. 4B(2), the number of layers is 3. Layer A is composed of 1 segment (segment 0), layer B is composed of 5 segments (segments 1 - 5), and layer C is composed of 7 segments (segments 6 - 12). In the example of Fig. 4B(3), the number of layers is 2. Layer A is composed of 1 segment (segment 0), and layer B is composed of 12 segments (segments 1 - 12). The number of OFDM segments and channel coding parameters of each layer are determined according to the programming information and transmitted by the TMCC signal, which is control information for assisting the operation of the receiver.

[0098] Note that as an example of the usage examples of the segment - layer assignments in Fig. 4B(1), (2), and (3), for example, the following examples may exist.

[0099] For example, the hierarchical assignment in Fig. 4B(1) can be used in the polarization - dual - mode terrestrial digital broadcast according to this embodiment. For both the horizontal polarization and the vertical polarization, the same segment hierarchical assignment can be used. Specifically, as the A - layer, the mobile - receiving service of the current terrestrial digital broadcast can be transmitted in the above - mentioned 1 segment of the horizontal polarization. (Note that the mobile - receiving service of the current terrestrial digital broadcast may also be transmitted in the above - mentioned 1 segment of the vertical polarization. In this case, it is also treated as the A - layer.) Also, as the B - layer, in the above - mentioned 7 segments of the horizontal polarization, a terrestrial digital broadcast service that transmits a video with a maximum resolution of the current terrestrial digital broadcast of horizontal 1920 pixels × vertical 1080 pixels can be transmitted. (Note that the terrestrial digital broadcast service that transmits a video with a maximum resolution of horizontal 1920 pixels × vertical 1080 pixels may also be transmitted in the above - mentioned 7 segments of the vertical polarization. In this case, it is also treated as the B - layer.) Furthermore, as the C - layer, it may be configured to transmit an advanced terrestrial digital broadcast service that can transmit a video with a pixel number exceeding horizontal 1920 pixels × vertical 1080 pixels as the maximum resolution in the above - mentioned 5 segments of both the horizontal polarization and the vertical polarization, a total of 10 segments. The details of the transmission will be described later. The transmission wave of the segment hierarchical assignment can be received, for example, by the second tuner / demodulation unit 130T of the broadcast receiving apparatus 100.

[0100] For example, the hierarchical assignment in FIG. 4B(2) can be used as another example different from FIG. 4B(1) in the polarization-duplex terrestrial digital broadcast according to this embodiment. The same segment hierarchical assignment can be used for both the horizontal polarization and the vertical polarization. Specifically, the mobile reception service of the current terrestrial digital broadcast may be transmitted in the above-mentioned one segment of the horizontal polarization as the A layer. (Note that the mobile reception service of the current terrestrial digital broadcast may also be transmitted in the above-mentioned one segment of the vertical polarization. In this case, this is also treated as the A layer.) Further, as the B layer, an advanced terrestrial digital broadcast service capable of transmitting a video with a maximum resolution of more than 1920 horizontal pixels × 1080 vertical pixels may be configured to be transmitted in the above-mentioned five segments of both the horizontal polarization and the vertical polarization, a total of ten segments. Also, as the C layer, the terrestrial digital broadcast service that transmits a video with a maximum resolution of 1920 horizontal pixels × 1080 vertical pixels, which is the current terrestrial digital broadcast, may be transmitted in the above-mentioned seven segments of the horizontal polarization. (Note that the terrestrial digital broadcast service that transmits a video with a maximum resolution of 1920 horizontal pixels × 1080 vertical pixels may also be transmitted in the above-mentioned seven segments of the vertical polarization. In this case, this is also treated as the C layer.) Details of the transmission will be described later. The transmission wave of the segment hierarchical assignment can be received, for example, by the second tuner / demodulation unit 130T of the broadcast receiving apparatus 100 of this embodiment.

[0101] For example, the hierarchical assignment in FIG. 4B(3) can be used in the hierarchical division multiplex terrestrial digital broadcast or the current terrestrial digital broadcast according to this embodiment. Specifically, when used in the hierarchical division multiplex terrestrial digital broadcast, the mobile reception service of the current terrestrial digital broadcast may be transmitted in one segment in the figure as the A layer. Further, as the B layer, a high-level terrestrial digital broadcast service capable of transmitting a video with a pixel number exceeding 1920 horizontal pixels × 1080 vertical pixels as the maximum resolution may be transmitted in 12 segments in the figure. The transmission wave of the segment hierarchical assignment can be received, for example, by the third tuner / demodulation unit 130L of the broadcast receiving apparatus 100 of this embodiment. When used in the current terrestrial digital broadcast, the mobile reception service of the current terrestrial digital broadcast may be transmitted in one segment in the figure as the A layer, and the terrestrial digital broadcast service for transmitting a video with 1920 horizontal pixels × 1080 vertical pixels as the maximum resolution, which is the current terrestrial digital broadcast, may be transmitted in 12 segments in the figure as the B layer. The transmission wave of the segment hierarchical assignment can be received, for example, by the first tuner / demodulation unit 130C of the broadcast receiving apparatus 100 of this embodiment.

[0102] Fig. 4C shows an example of a system on the broadcasting station side that realizes the generation process of an OFDM transmission wave, which is a digital broadcast wave for polarization - dual - use terrestrial digital broadcasting and hierarchical division multiplex terrestrial digital broadcasting according to this embodiment. The information source encoding unit 411 encodes video / audio / various data, etc. respectively. The multiplexing unit / limited reception processing unit 415 multiplexes the video / audio / various data, etc. encoded by the information source encoding unit 411 respectively, and further appropriately executes processing corresponding to limited reception, and outputs it as a packet stream. A plurality of information source encoding units 411 and multiplexing units / limited reception processing units 415 can exist in parallel, and generate a plurality of packet streams. In the transmission path encoding unit 416, the plurality of packet streams are remultiplexed into one packet stream, and transmission path encoding processing is performed, and it is output as an OFDM transmission wave. The configuration shown in Fig. 4C is common to the ISDB - T system as a configuration for realizing the generation process of the OFDM transmission wave, although the details of the information source encoding and transmission path encoding methods are different. Therefore, among the plurality of information source encoding units 411 and multiplexing units / limited reception processing units 415, a part can be configured for terrestrial digital broadcast services of the ISDB - T system, and a part can be configured for advanced terrestrial digital broadcast services, and the packet streams of a plurality of different terrestrial digital broadcast services can be multiplexed by the transmission path encoding unit 416. When the multiplexing unit / limited reception processing unit 415 is configured for terrestrial digital broadcast services of the ISDB - T system, MPEG - 2TS, which is a stream of TSP (Transport Stream Packet) defined in the MPEG - 2 systems, may be generated. When the multiplexing unit / limited reception processing unit 415 is configured for advanced terrestrial digital broadcast services, an MMT packet stream or a TLV stream including MMT packets, or a stream of TSP defined in other systems may be generated. Naturally, all of the plurality of information source encoding units 411 and multiplexing units / limited reception processing units 415 can be configured for advanced terrestrial digital broadcast services, and all the packet streams multiplexed by the transmission path encoding unit 416 can be packet streams for advanced terrestrial digital broadcast services.

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

[0104] First, FIG. 4D(1) will be described. FIG. 4D(1) shows the configuration of the transmission path encoding unit 416 when generating only the OFDM transmission wave of the current terrestrial digital broadcast service. The OFDM transmission wave transmitted in this configuration has, for example, the segment configuration of FIG. 4B(3). The packet stream input from the multiplexing unit / limiting reception processing unit 415 and subjected to remultiplexing processing has error correction redundancy added thereto, and various interleaving processes such as byte interleaving, bit interleaving, time interleaving, and frequency interleaving are performed. Thereafter, processing by IFFT (Inverse Fast Fourier Transform) is performed together with the pilot signal, TMCC signal, and AC signal, and after adding a guard interval, it becomes an OFDM transmission wave through quadrature modulation. Note that the outer code processing, power spreading processing, byte interleaving, inner code processing, and mapping processing are configured to be able to be processed separately for each layer such as layer A and layer B. (In the current terrestrial digital broadcast service, although there are two operational layers, transmission up to three layers is possible. Therefore, FIG. 4D(1) shows an example of three layers.) The mapping processing is the modulation processing of the carrier. Also, the packet stream input from the multiplexing unit / limiting reception processing unit 415 may have information such as TMCC information, mode, and guard interval ratio multiplexed. Note that the packet stream input to the transmission path encoding unit 416 may be a TSP stream defined in the MPEG-2 systems as described above. The OFDM transmission wave generated with the configuration of FIG. 4D(1) can be received, for example, by the first tuner / demodulation unit 130C of the broadcast receiving apparatus 100 of the present embodiment.

[0105] Next, FIG. 4D(2) will be described. FIG. 4D(2) shows the configuration of the transmission path encoding unit 416 when generating an OFDM transmission wave for polarization - multiplexed terrestrial digital broadcasting according to this embodiment. The OFDM transmission wave transmitted with this configuration has, for example, the segment configuration of FIG. 4B(1) or (2). Also in FIG. 4D(2), the packet stream input from the multiplexing unit / limited reception processing unit 415 and subjected to remultiplexing processing has error - correction redundancy added thereto, and various interleaving processes such as byte interleaving, bit interleaving, time interleaving, and frequency interleaving are performed. Thereafter, processing by IFFT is performed together with the pilot signal, TMCC signal, and AC signal, and after guard interval addition processing, it becomes an OFDM transmission wave through quadrature modulation.

[0106] In the configuration example of FIG. 4D(2), the outer code processing, power spreading processing, byte interleaving, inner code processing, mapping processing, and time interleaving are configured to be able to be processed separately for each layer such as layer A, layer B, and layer C. However, the configuration example of FIG. 4D(2) generates not only the OFDM transmission wave of the horizontal polarization (H) but also the OFDM transmission wave of the vertical polarization (V), and the processing flow branches into two systems. When branching from the processing system of the horizontal polarization (H) to the processing system of the vertical polarization (V), whether to branch the same data as the processing system of the horizontal polarization (H) to the processing system of the vertical polarization (V), whether to branch different data from the processing system of the horizontal polarization (H) to the processing system of the vertical polarization (V), or whether not to branch data to the processing system of the vertical polarization (V) can be made different for each layer corresponding to the segment configuration described in FIG. 4B(1) or (2).

[0107] For the processing such as outer code, inner code, and mapping shown in the configuration of FIG. 4D(2), in addition to the processing compatible with the configuration of FIG. 4D(1), more advanced processing not adopted in each processing of the configuration of FIG. 4D(1) can be used. Specifically, among the configurations of FIG. 4D(2), for the parts where processing is performed for each layer, in the layer where the current terrestrial digital broadcast mobile reception service or the current terrestrial digital broadcast service that transmits video with a maximum resolution of horizontal 1920 pixels × vertical 1080 pixels is transmitted, for the processing such as outer code, inner code, and mapping, processing compatible with the configuration of FIG. 4D(1) is performed. On the contrary, among the configurations of FIG. 4D(2), for the parts where processing is performed for each layer, for the layer that transmits an advanced terrestrial digital broadcast service capable of transmitting video with a pixel number exceeding horizontal 1920 pixels × vertical 1080 pixels as the maximum resolution, for the processing such as outer code, inner code, and mapping, it may be configured to use more advanced processing not adopted in each processing of the configuration of FIG. 4D(1).

[0108] Note that in the polarization-duplex terrestrial digital broadcast according to this embodiment, since the allocation of the layer and the terrestrial digital broadcast service to be transmitted can be switched by the TMCC information described later, it is desirable to configure the processing such as outer code, inner code, and mapping applied to each layer to be switchable by the TMCC information.

[0109] Note that for the layer that transmits an advanced terrestrial digital broadcast service capable of transmitting video with a pixel number exceeding horizontal 1920 pixels × vertical 1080 pixels as the maximum resolution, byte interleaving, bit interleaving, and time interleaving may perform processing compatible with the current terrestrial digital broadcast service, or may perform more advanced different processing. Or for the layer that transmits an advanced terrestrial digital broadcast service, some interleaving may be omitted.

[0110] In the configuration of FIG. 4D(2), the input stream serving as the source of the layer in which the current terrestrial digital broadcast mobile reception service or the current terrestrial digital broadcast service for transmitting video with a maximum resolution of horizontal 1920 pixels × vertical 1080 pixels is transmitted may be the stream of TSP defined in the MPEG-2 systems adopted in the current terrestrial digital broadcast among the packet streams input to the transmission path encoding unit 416. The input stream serving as the source of the layer for transmitting the advanced terrestrial digital broadcast service in the configuration of FIG. 4D(2) may be a stream defined by a system other than the stream of TSP defined in the MPEG-2 systems, such as an MMT packet stream or a TLV including an MMT packet, among the packet streams input to the transmission path encoding unit 416. However, a stream of TSP defined in the MPEG-2 systems may be adopted for the advanced terrestrial digital broadcast service.

[0111] In the configuration of FIG. 4D(2) described above, until the OFDM transmission wave is generated from the input stream, in the layer in which the current terrestrial digital broadcast mobile reception service or the current terrestrial digital broadcast service for transmitting video with a maximum resolution of horizontal 1920 pixels × vertical 1080 pixels is transmitted, a stream format and processing compatible with the current terrestrial digital broadcast are maintained. As a result, when one of the OFDM transmission waves of horizontal polarization or vertical polarization generated in the configuration of FIG. 4D(2) is received by a receiving device of the existing current terrestrial digital broadcast service, for the layer in which the current terrestrial digital broadcast mobile reception service or the current terrestrial digital broadcast service for transmitting video with a maximum resolution of horizontal 1920 pixels × vertical 1080 pixels is transmitted, it becomes possible to correctly receive and demodulate the broadcast signal of the terrestrial digital broadcast service.

[0112] In addition, in the configuration of FIG. 4D(2), in the layer using both the segments of the horizontally polarized OFDM transmission wave and the vertically polarized OFDM transmission wave, it is possible to transmit an advanced terrestrial digital broadcast service capable of transmitting a video with a pixel count exceeding 1920 horizontal pixels × 1080 vertical pixels as the maximum resolution, and the broadcast signal of the advanced terrestrial digital broadcast service can be received and demodulated by the broadcast receiving apparatus 100 according to an embodiment of the present invention.

[0113] That is, in the configuration of FIG. 4D(2), in a broadcast receiving apparatus corresponding to an advanced terrestrial digital broadcast service and also in a receiving apparatus for an existing current terrestrial digital broadcast service, it is possible to generate a digital broadcast wave that can preferably receive and demodulate digital broadcasts.

[0114] Next, FIG. 4D(3) will be described. FIG. 4D(3) shows the configuration of the transmission path encoding unit 416 when generating the OFDM transmission wave of the hierarchical division multiplex terrestrial digital broadcast according to the present embodiment. Also in FIG. 4D(3), the packet stream input from the multiplexing unit / limited reception processing unit 415 and subjected to remultiplexing processing has error correction redundancy added thereto, and various interleaving processes such as byte interleaving, bit interleaving, time interleaving, and frequency interleaving are performed. Thereafter, processing by IFFT is performed together with the pilot signal, TMCC signal, and AC signal, and after adding a guard interval, it becomes an OFDM transmission wave through quadrature modulation.

[0115] However, in the configuration of FIG. 4D(3), modulated waves transmitted in the upper layer and modulated waves transmitted in the lower layer are generated respectively, multiplexed, and then an OFDM transmission wave which is a digital broadcast wave is generated. The processing system shown above the configuration of FIG. 4D(3) is a processing system for generating a modulated wave transmitted in the upper layer, and the processing system shown below is a processing system for generating a modulated wave transmitted in the lower layer. The data transmitted by the processing system for generating the modulated wave transmitted in the upper layer of FIG. 4D(3) is the mobile reception service of current terrestrial digital broadcast and the current terrestrial digital broadcast service for transmitting video with a maximum resolution of horizontal 1920 pixels × vertical 1080 pixels. 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 of 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) similar to the transmission wave of FIG. 4D(1). Therefore, the modulated wave transmitted in the upper layer of FIG. 4D(3) is a digital broadcast wave compatible with the mobile reception service of current terrestrial digital broadcast and the current terrestrial digital broadcast service for transmitting video with a maximum resolution of horizontal 1920 pixels × vertical 1080 pixels. On the other hand, the data transmitted by the processing system for generating the modulated wave transmitted in the lower layer of FIG. 4D(3) is an advanced terrestrial digital broadcast service capable of transmitting video with a pixel number exceeding horizontal 1920 pixels × vertical 1080 pixels as the maximum resolution. For example, for processes such as outer code, inner code, and mapping, it may be configured to use more advanced processes not adopted in each process of the configuration of FIG. 4D(1).

[0116] The modulated wave transmitted in the lower layer of FIG. 4D(3) may be assigned to, for example, an advanced terrestrial digital broadcast service capable of transmitting a video with a maximum resolution of more than 1920 horizontal pixels × 1080 vertical pixels with all 13 segments as the A layer. Alternatively, it may have the segment configuration of FIG. 4B(3), transmit the mobile reception service of the current terrestrial digital broadcast in the A layer of 1 segment, and transmit an advanced terrestrial digital broadcast service capable of transmitting a video with a maximum resolution of more than 1920 horizontal pixels × 1080 vertical pixels in the B layer of 12 segments. In the latter case, similar to FIG. 4D(2), it may be configured so that the processing can be switched for each layer such as the A layer and the B layer from the outer code processing to the time interleaving processing. Regarding the point that it is necessary to maintain the processing compatible with the current terrestrial digital broadcast in the layer that transmits the mobile reception service of the current terrestrial digital broadcast, it is the same as the explanation of FIG. 4D(2).

[0117] In the configuration of FIG. 4D(3), an OFDM transmission wave, which is a terrestrial digital broadcast wave obtained by multiplexing the modulated wave transmitted in the upper layer and the modulated wave transmitted in the lower layer, is generated. Since the technology for separating the modulated wave transmitted in the upper layer from the OFDM transmission wave is also installed in the receiving devices of the existing current terrestrial digital broadcast services, the broadcast signals of the mobile reception service of the current terrestrial digital broadcast and the current terrestrial digital broadcast service for transmitting a video with a maximum resolution of 1920 horizontal pixels × 1080 vertical pixels included in the modulated wave transmitted in the upper layer can be correctly received and demodulated by the receiving devices of the existing current terrestrial digital broadcast services. On the other hand, the broadcast signals of the advanced terrestrial digital broadcast service capable of transmitting a video with a maximum resolution of more than 1920 horizontal pixels × 1080 vertical pixels included in the modulated wave transmitted in the lower layer can be received and demodulated by the broadcast receiving device 100 according to the embodiment of the present invention.

[0118] That is, in the configuration of FIG. 4D(3), a digital broadcast wave that can be preferably received and demodulated can be generated in a broadcast receiving apparatus corresponding to an advanced terrestrial digital broadcast service, as well as in an existing receiving apparatus for the current terrestrial digital broadcast service. Further, in the configuration of FIG. 4D(3), unlike the configuration of FIG. 4D(2), it is not necessary to use a plurality of polarization waves, and an OFDM transmission wave that can be received more simply can be generated.

[0119] In the OFDM transmission wave generation process according to FIGS. 4D(1), 4D(2), and 4D(3) of this embodiment, three types of modes with different numbers of carriers are prepared in consideration of the compatibility with the station spacing of the SFN and the resistance to the Doppler shift in mobile reception. Note that additional different modes with different numbers of carriers may be prepared. In a mode with a large number of carriers, the effective symbol length becomes long, and if the same guard interval ratio (guard interval length / effective symbol length) is used, the guard interval length becomes long, making it possible to have resistance to multipaths with a long delay time difference. On the other hand, in the case of a mode with a small number of carriers, the carrier interval becomes wide, making it possible to reduce the influence of carrier interference due to the Doppler shift that occurs in the case of mobile reception or the like.

[0120] In the OFDM transmission wave generation process according to FIGS. 4D(1), 4D(2), and 4D(3) of this embodiment, parameters such as the carrier modulation method, the coding rate of the inner code, and the time interleaving length can be set for each layer composed of one or more OFDM segments. FIG. 4E shows an example of the transmission parameters per segment of the OFDM segment identified in 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 noise resistance is more important than the amount of information, a modulation method is adopted in which mapping is performed to a constellation with a small number of states (BPSK or DBPSK, i.e., 2 states), which has fewer states than the modulation method of the 'data' carrier (all of which are QPSK or higher, i.e., 4 states or more), to enhance the noise resistance.

[0121] In addition, each numerical value of the number of carriers is such that the value on the left side of the diagonal line is the value when QPSK, 16QAM, 64QAM, etc. are set as the carrier modulation method, and the value on the right side of the diagonal line is the value when DQPSK is set as the carrier modulation method. In the figure, the parameters with underlines are parameters that are not compatible with the current mobile reception service of terrestrial digital broadcasting. Specifically, 256QAM, 1024QAM, and 4096QAM, which are the modulation methods of the 'Data' carrier, are not adopted in the current terrestrial digital broadcasting service. Therefore, in the processing of the layer that requires compatibility with the current terrestrial digital broadcasting service in the OFDM broadcast wave generation process according to FIGS. 4D(1), 4D(2), and 4D(3) of this embodiment, 256QAM, 1024QAM, and 4096QAM, which are the modulation methods of the 'Data' carrier, are not used. For the 'Data' carrier transmitted in the layer corresponding to the advanced terrestrial digital broadcasting service, in addition to modulation methods such as QPSK (number of states 4), 16QAM (number of states 16), and 64QAM (number of states 64) that are compatible with the current terrestrial digital broadcasting service, more multi-value modulation methods such as 256QAM (number of states 256), 1024QAM (number of states 1024), and 4096QAM (number of states 4096) may be applied. Also, modulation methods different from these may be adopted.

[0122] Note that for the modulation method of the pilot symbol (SP or CP) carrier, BPSK (number of states 2) that is compatible with the current terrestrial digital broadcasting service may be used. For the modulation methods of the AC carrier and the TMCC carrier, DBPSK (number of states 2) that is compatible with the current terrestrial digital broadcasting service may be used.

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

[0124] Also, FIG. 4F shows an example of the transmission signal parameters per physical channel (6 MHz bandwidth) of the OFDM broadcast wave generation processing according to FIGS. 4D(1), 4D(2), and 4D(3) of this embodiment. In the OFDM broadcast wave generation processing according to FIGS. 4D(1), 4D(2), and 4D(3) of this embodiment, basically, for compatibility with current terrestrial digital broadcast services, parameters that are compatible with current terrestrial digital broadcast services are adopted as a principle in the parameters of FIG. 4F. 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 current terrestrial digital broadcast services in that 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) serving as demodulation references, and carriers for transmitting TMCC signals which are information such as the modulation format and convolutional coding rate of the carriers. For these transmissions, a number of carriers corresponding to 1 / 9 of the number of carriers per segment are used. Also, concatenated codes are adopted for error correction, a shortened Reed-Solomon (204,188) code is used for 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 used for the inner code. Different coding may be used for both the outer code and the inner code. The information rate varies depending on parameters such as the carrier modulation format, convolutional coding rate, and guard interval ratio.

[0126] Also, 204 symbols are taken as one frame, and an integer number of TSPs are included within one frame. The switching of transmission parameters is performed at the boundary of this frame.

[0127] Pilot signals serving as demodulation references include SP (Scattered Pilot), CP (Continual Pilot), AC (Auxiliary Channel) 1, and AC2. FIGS. 4G show an example of the arrangement image within a segment of pilot signals and the like in the case of synchronous modulation (QPSK, 16QAM, 64QAM, 256QAM, 1024QAM, 4096QAM, etc.). SP is inserted into the 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 reference for synchronous demodulation. FIGS. 4H show an example of the arrangement image within a segment of pilot signals and the like in the case of differential modulation (DQPSK, etc.). CP is a continuous signal inserted at the left end of the segment of differential modulation and is used for demodulation.

[0128] AC1 and AC2 carry information for the CP and are used not only for the pilot signal but also for transmitting information for broadcasters. They may also be used for transmitting other information.

[0129] Note that the layout images shown in FIGS. 4G and 4H are examples for Mode 3, and the carrier numbers range from 0 to 431. However, for Mode 1 and Mode 2, they range from 0 to 107 and 0 to 215 respectively. Also, the carriers for transmitting AC1, AC2, and TMCC may be determined in advance for each segment. The carriers for transmitting AC1, AC2, and TMCC shall be arranged randomly in the frequency direction in order to reduce the influence 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 segment. The TMCC signal is transmitted on the carriers specified for TMCC transmission within each segment. FIG. 5A shows an example of the bit assignment 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 for identifying the segment format and identify whether each segment is a differential modulation section or a synchronization modulation section. B20 to B121 contain the TMCC information. B122 to B203 are parity bits.

[0131] The TMCC information of the OFDM transmission wave according to this embodiment may be configured to include information for assisting the demodulation and decoding operations of the receiver, such as, for example, system identification, transmission parameter switching indicator, startup control signal (startup flag for emergency warning broadcast), current information, next information, frequency conversion process identification, physical channel number identification, main signal identification, 4K signal transmission layer identification, additional layer transmission identification, etc. 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 switching of the transmission parameters is performed on a frame-by-frame basis. FIG. 5B shows an example of the bit assignment of the TMCC information. Also, FIG. 5C shows an example of the configuration of the transmission parameter information included in the current information / next information. Note that the concatenated transmission phase correction amount is control information used when the transmission method is a common terrestrial digital audio broadcast ISDB-TSB (ISDB for Terrestrial Sound Broadcasting), etc., and the detailed description thereof is omitted here.

[0132] FIG. 5D shows an example of the bit assignment of the system identification. Two bits are assigned to the signal for system identification. In the case of the current terrestrial digital television broadcast system, '00' is set. In the case of a common terrestrial digital audio broadcast system with the same transmission method, '01' is set. Also, in the case of an advanced terrestrial digital television broadcast system such as the polarization-duplex terrestrial digital broadcast or the hierarchical division multiplex terrestrial digital broadcast according to this embodiment, '10' is set. In the advanced terrestrial digital television broadcast system, by transmitting broadcast waves by the polarization-duplex transmission method or the hierarchical division multiplex method, it is possible to simultaneously transmit 2K broadcast programs (broadcast programs of images with 1920 horizontal pixels × 1080 vertical pixels, and broadcast programs of images with lower resolutions may also be included) and 4K broadcast programs (broadcast programs of images exceeding 1920 horizontal pixels × 1080 vertical pixels) within the same service.

[0133] The transmission parameter switching indicator is used to notify the receiver of the switching timing by counting down when switching the transmission parameters. This indicator usually has a value of '1111', and when switching the transmission parameters, it is decremented by 1 for each frame starting from 15 frames before the switch. The switching timing is set to the next frame synchronization that sends '0000'. The value of the indicator returns to '1111' after '0000'. When switching any one or more of the parameters such as the system identification of the TMCC information shown in Fig. 5B, the current information / next information, the transmission parameter, the frequency conversion processing identification, the main signal identification, the 4K signal transmission layer identification, and the additional layer transmission identification, etc., a countdown is performed. When only switching the start control signal of the TMCC information, no countdown is performed.

[0134] The start control signal (emergency warning broadcast start flag) is set to '1' when start control to the receiver is being performed in an emergency warning broadcast, and '0' when start control is not being performed.

[0135] The partial reception flag for each current information / next information is set to '1' when the segment in the center of the transmission band is set for partial reception, and '0' otherwise. When segment 0 is set for partial reception, the layer is defined as layer A. When there is no next information, the partial reception flag is set to '1'.

[0136] FIG. 5E shows an example of bit allocation for a carrier modulation mapping method (modulation method of data carriers) in each hierarchical transmission parameter for current information / next information. When this parameter is "000", it indicates that the modulation method is DQPSK. When it is "001", it indicates that the modulation method is QPSK. When it is "010", it indicates that the modulation method is 16QAM. When it is "011", it indicates that the modulation method is 64QAM. When it is "100", it indicates that the modulation method is 256QAM. When it is "101", it indicates that the modulation method is 1024QAM. When it is "110", it indicates that the modulation method is 4096QAM. When there is no unused hierarchy or next information, "111" is set for this parameter.

[0137] Settings such as the coding rate and the length of time interleaving may be set for each parameter according to the composition information of each hierarchy for current information / next information. The number of segments indicates the number of segments of each hierarchy as a 4-bit value. When there is no unused hierarchy or next information, "1111" is set. Note that since settings such as the mode and the guard interval ratio are detected independently on the receiver side, transmission in TMCC information may not be performed.

[0138] FIG. 5F shows an example of bit assignment for frequency conversion process identification. For frequency conversion process identification, in the conversion units 201T and 201L in FIG. 2A, when a frequency conversion process (in the case of the polarization multiplexing transmission system) or a frequency conversion amplification process (in the case of the hierarchical division multiplexing transmission system) described later is performed, '0' is set. When no frequency conversion process or frequency conversion amplification process is performed, '1' is set. This parameter is set to '1' when being sent from a broadcasting station, for example, and may be configured to rewrite it to '0' in the conversion units 201T and 201L when the frequency conversion process or frequency conversion amplification process is executed in the conversion units 201T and 201L. In this way, when received by the second tuner / demodulation unit 130T or the third tuner / demodulation unit 130L of the broadcast receiving apparatus 100, if the bit of the frequency conversion process identification is '0', it can be identified that the frequency conversion process or the like has been performed after the OFDM transmission wave is sent from the broadcasting station.

[0139] In the polarization multiplexing terrestrial digital broadcast according to this embodiment, for each of a plurality of polarizations, the setting and rewriting of the frequency conversion process identification bit may be performed. For example, if neither of the two polarizations among the plurality of polarizations is frequency-converted by the conversion unit 201T in FIG. 2A, the frequency conversion process identification bits included in the OFDM transmission waves of both polarizations may be left as '1'. Also, if only one of the polarizations among the plurality of polarizations 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. Further, if both of the polarizations among the plurality of polarizations are frequency-converted by the conversion unit 201T, the frequency conversion process identification bits included in the OFDM transmission waves of the two frequency-converted polarizations may be rewritten to '0' in the conversion unit 201T. In this way, in the broadcast receiving apparatus 100, it is possible to identify the presence or absence of frequency conversion for each polarization among the plurality of polarizations.

[0140] Note that since the frequency conversion process identification bit is not defined in the current terrestrial digital broadcast, it will be ignored by terrestrial digital broadcast receivers that are already in use by users. However, this bit may be introduced into a new terrestrial digital broadcast service that transmits video with a maximum resolution of 1920 pixels horizontally × 1080 pixels vertically, which is an improvement over the current terrestrial digital broadcast. In this case, the first tuner / demodulator unit 130C of the broadcast receiver 100 according to the embodiment of the present invention may also be configured as a first tuner / demodulator unit corresponding to the new terrestrial digital broadcast service.

[0141] As a modification, it may be set to '0' in advance when being sent from the broadcast station on the premise that the frequency conversion process or the frequency conversion amplification process is performed on the OFDM transmission wave by the conversion unit 201T or the conversion unit 201L in FIG. 2A. Note that when the received broadcast wave is not an advanced terrestrial digital broadcast service, this parameter may be configured to be set to '1'.

[0142] FIG. 5G shows an example of bit allocation for physical channel number identification. The physical channel number identification is composed of a 6-bit code and identifies the physical channel number (channels 13 to 52) of the received broadcast wave. When the received broadcast wave is not an advanced terrestrial digital broadcast service, this parameter is set to '111111'. The bits of the physical channel number identification are not defined in the current terrestrial digital broadcast, and in the receiving apparatus of the current terrestrial digital broadcast, the physical channel number of the broadcast wave designated by the broadcasting station side cannot be obtained from a TMCC signal, an AC signal, or the like. In the broadcast receiving apparatus 100 according to an embodiment of the present invention, by using the bits of the physical channel number identification of the received OFDM transmission wave, the physical channel number set by the broadcasting station side for the OFDM transmission wave can be grasped without demodulating carriers other than the TMCC signal and the AC signal. Note that the physical channels from 13ch to 52ch are pre-allocated to the frequency band of 470 to 710 MHz with a bandwidth of 6 MHz per channel. Therefore, being able to grasp the physical channel number of the OFDM transmission wave based on the bits of the physical channel number identification in the broadcast receiving apparatus 100 means that the frequency band in which the OFDM transmission wave was transmitted in the air as a terrestrial digital broadcast wave can be grasped.

[0143] In the polarization - multiplexed terrestrial digital broadcast according to this embodiment, in the generation process of the OFDM transmission wave on the broadcast station side, the physical channel number identification bits may be arranged for each of a plurality of polarization pairs in the bandwidth originally constituting one physical channel, and the same physical number may be assigned. Here, depending on the installation environment of the broadcast receiving apparatus 100, in the conversion unit 201T of FIG. 2A, only the frequency of one of the plurality of polarizations may be converted. As a result, when the frequencies of each of the plurality of polarization pairs received by the broadcast receiving apparatus 100 are different from each other, if the broadcast receiving apparatus side cannot grasp in some way that the plurality of polarizations with different frequencies were originally a pair, the advanced terrestrial digital broadcast using both polarizations of the polarization - multiplexed terrestrial digital broadcast cannot be demodulated. Even in such a case, by using the above - mentioned physical channel number identification bits, when there are transmission waves with the same value of the physical channel number identification bit at a plurality of different frequencies in the broadcast receiving apparatus 100, it can be identified that they are the transmission waves originally transmitted as a polarization pair constituting one physical channel on the broadcast station side. Thereby, it becomes possible to realize the demodulation of the advanced terrestrial digital broadcast of the polarization - multiplexed terrestrial digital broadcast by using the plurality of transmission waves indicating the same value.

[0144] FIG. 5H shows an example of the bit assignment for the main signal identification. This example is an example in which the bit for the main signal identification is arranged at bit B117.

[0145] When the transmitted OFDM transmission wave is the transmission wave of the polarization - multiplexed terrestrial digital broadcast, in the TMCC information of the transmission wave transmitted by the main polarization, this parameter is set to '1'. In the TMCC information of the transmission wave transmitted by the sub - polarization, it is set to '0'. Note that the transmission wave transmitted by the main polarization refers to the polarization signal in the same polarization direction as the polarization direction used for the transmission of the current terrestrial digital broadcast service among the vertical polarization signal and the horizontal polarization signal. That is, in an area where the current terrestrial digital broadcast service uses horizontal polarization for transmission, in the polarization - multiplexed terrestrial digital broadcast service, the horizontal polarization is the main polarization and the vertical polarization is the sub - polarization. Also, in an area where the current terrestrial digital broadcast service uses vertical polarization for transmission, in the polarization - multiplexed terrestrial digital broadcast service, the vertical polarization is the main polarization and the horizontal polarization is the sub - polarization.

[0146] In the broadcast receiving apparatus 100 that receives the transmission wave of the polarization - multiplexed terrestrial digital broadcast according to the embodiment of the present invention, by using the bit for the main signal identification, it is possible to identify whether the received transmission wave was transmitted by the main polarization or the sub - polarization during transmission. For example, by using the identification process for the main polarization and the sub - polarization, during the initial scan described later, it is possible to perform the initial scan on the transmission wave transmitted by the main polarization first, and after the completion of the initial scan of the transmission wave transmitted by the main polarization, perform the initial scan of the transmission wave transmitted by the sub - polarization.

[0147] Details of the configuration example of the layers, segments, and digital broadcast services to be transmitted in the polarization - dual - use terrestrial digital broadcast according to this embodiment will be described later. However, when transmitting the current terrestrial digital broadcast service using a layer composed of segments included only in the main polarization, and transmitting an advanced terrestrial digital broadcast service using a layer including segments included in both the main polarization and the sub - polarization, it is possible to first perform an initial scan of the transmission wave transmitted in the main polarization, complete the initial scan of the current terrestrial digital broadcast service, and then perform an initial scan of the transmission wave transmitted in the sub - polarization to perform an initial scan of the advanced terrestrial digital broadcast service. In this way, the initial scan of the advanced terrestrial digital broadcast service can be performed after the completion of the initial scan of the current terrestrial digital broadcast service, and the settings by the initial scan of the current terrestrial digital broadcast service can be reflected in the settings by the initial scan of the advanced terrestrial digital broadcast service, which is preferable. Note that the definitions of the meanings of '1' and '0' of the bits for main signal identification may be reversed from the above - described explanation.

[0148] Also, instead of the bits for main signal identification, polarization - direction identification bits may be used as a parameter of the TMCC information. Specifically, for a transmission wave transmitted in the horizontal polarization, the polarization - direction identification bit may be set to '1' on the broadcast - station side, and for a transmission wave transmitted in the vertical polarization, the polarization - direction identification bit may be set to '0' on the broadcast - station side. In the broadcast receiving apparatus 100 that receives the transmission wave of the polarization - dual - use terrestrial digital broadcast according to the embodiment of the present invention, by using the polarization - direction identification bits, it is possible to identify in which polarization direction the received transmission wave was transmitted during transmission. For example, by using the identification process of the polarization direction, during the initial scan described later, it is possible to perform an initial scan of the transmission wave transmitted in the horizontal polarization first, and after the completion of the initial scan of the transmission wave transmitted in the horizontal polarization, perform an initial scan of the transmission wave transmitted in the vertical polarization. Since the explanation of the effect of the process is the same as that of the part related to the initial scan in the explanation of the bits for main signal identification above, where'main polarization' is read as 'horizontal polarization' and'sub - polarization' is read as'vertical polarization', the repeated explanation is omitted.

[0149] Note that the definitions of the meanings of '1' and '0' of the polarization direction identification bit may be reversed from the above description.

[0150] Alternatively, instead of the bits for main signal identification described above, the first signal second signal identification bit may be used as a parameter of the TMCC information. Specifically, one of the horizontal polarization and the vertical polarization is defined as the first polarization, the broadcast signal of the transmission wave transmitted with the first polarization is 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 is defined as the second polarization, the broadcast signal of the transmission wave transmitted with the second polarization is 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 apparatus 100 that receives the transmission wave of the polarization - dual - use terrestrial digital broadcast according to the embodiment of the present invention, by using the first signal second signal identification bit, it is possible to identify in which polarization direction the received transmission wave was transmitted at the time of transmission. Note that the first signal second signal identification bit is only the concept of'main polarization' and'sub - polarization' replaced by 'first polarization' and'second polarization' from the definition of the bits for main signal identification described above. For the processing and effects in the broadcast receiving apparatus 100, the part related to the processing of the broadcast receiving apparatus 100 in the description of the bits for main signal identification above, just read'main polarization' as 'first polarization' and'sub - polarization' as'second polarization', so the repeated description is omitted.

[0151] Note that the definitions of the meanings of '1' and '0' of the first signal second signal identification bit may be reversed from the above description.

[0152] Next, in the transmission wave of the hierarchical division multiplex terrestrial digital broadcast according to the present embodiment, instead of the bits for main signal identification described above, the upper - lower layer identification bit may be used as a parameter of the TMCC information. Specifically, in the TMCC information of the modulated wave transmitted in the upper layer, the upper - lower layer identification bit may be set to '1', and in the TMCC information of the transmission wave transmitted in the lower layer, the upper - lower layer identification bit may be set to '0'. Also, when the received broadcast wave is not an advanced terrestrial digital broadcast service, this parameter may be set to '1'.

[0153] In the hierarchical division multiplex terrestrial digital broadcast according to this embodiment, here, in the generation process of the OFDM transmission wave on the broadcast station side, among the plurality of modulated waves that were originally transmitted in the upper layer and the lower layer of one physical channel, for the lower layer, depending on the installation environment of the broadcast receiving apparatus 100, frequency conversion and signal amplification may be performed by the conversion unit 201L in FIG. 2A. When the broadcast receiving apparatus 100 receives the transmission wave of the hierarchical division multiplex terrestrial digital broadcast, based on the above-described upper and lower layer identification bits, it is possible to identify whether it was a modulated wave originally transmitted in the upper layer or a modulated wave originally transmitted in the lower layer. For example, by the identification process, the initial scan of the advanced terrestrial digital broadcast service transmitted in the lower layer can be performed after the completion of the initial scan of the current terrestrial digital broadcast service transmitted in the upper layer, and the settings by the initial scan of the current terrestrial digital broadcast service can be reflected in the settings by the initial scan of the advanced terrestrial digital broadcast service. Also, in the third tuner / demodulation unit 130L of the broadcast receiving apparatus 100, it can also be used to switch the processing between the demodulation unit 133S and the demodulation unit 133L based on the identification result.

[0154] In the description of the polarization - dual transmission method in each of the following embodiments, unless otherwise specified, as an example, an example will be described in which the horizontal polarization is the main polarization and the vertical polarization is the sub - polarization. However, the main - sub relationship between the horizontal polarization and the vertical polarization may be reversed. FIG. 5I shows an example of the bit assignment for 4K signal transmission layer identification.

[0155] When the broadcast wave to be transmitted is the broadcast wave of the polarization - dual - use terrestrial digital broadcast service according to this embodiment, the bit for identifying the 4K signal transmission layer may indicate whether to use both the horizontally polarized signal and the vertically polarized signal to transmit the 4K broadcast program for each of the B - layer and the C - layer. Allocate 1 bit to each of the B - layer setting and the C - layer setting. For example, in the B - layer and the C - layer, when the bit for identifying the 4K signal transmission layer for each layer is '0', it may be set to indicate that the 4K broadcast program is transmitted using both the horizontally polarized signal and the vertically polarized signal in that layer. In the B - layer and the C - layer, when the bit for identifying the 4K signal transmission layer for each layer is '1', it may be set to indicate that the 4K broadcast program using both the horizontally polarized signal and the vertically polarized signal is not transmitted in that layer. In this way, in the broadcast receiving apparatus 100, using the bit for identifying the 4K signal transmission layer, it is possible to identify whether to use both the horizontally polarized signal and the vertically polarized signal to transmit the 4K broadcast program in each of the B - layer and the C - layer.

[0156] Also, when the broadcast wave to be transmitted is the broadcast wave of the hierarchical division multiplex terrestrial digital broadcast service of this embodiment, the bit for identifying the 4K signal transmission layer may indicate whether to transmit the 4K broadcast program in the lower layer. When the B119 of this parameter is '0', the 4K broadcast program is transmitted in the lower layer. When the B119 of this parameter is '1', the 4K broadcast program is not transmitted in the lower layer. In this way, in the broadcast receiving apparatus 100, using the bit for identifying the 4K signal transmission layer, it is possible to identify whether to transmit the 4K broadcast program in the lower layer.

[0157] Note that when this parameter is '0', as the carrier modulation mapping method, in addition to the basic modulation method shown in FIG. 5C, it is possible to adopt the NUC (Non - Uniform Constellation) modulation method. In this case, it is possible to transmit the current / next information of the transmission parameter additional information regarding the B - layer / C - layer using AC1 or the like.

[0158] Also, when the broadcast wave to be transmitted is not the Advanced Terrestrial Digital Broadcasting Service, these parameters may each be set to '1'.

[0159] Note that the definitions of '0' and '1' for the bits of the 4K signal transmission layer identification described above may be reversed from the above description.

[0160] Fig. 5J shows an example of the bit assignment of the additional layer transmission identification. The bits of the additional layer transmission identification may indicate whether to use each of the B layer and the C layer of the transmission wave transmitted by the secondary polarization as the virtual D layer or the virtual E layer when the broadcast wave to be transmitted is the polarization - dual terrestrial digital broadcasting service of this embodiment.

[0161] For example, in the example of the figure, the bit arranged at B120 is the D - layer transmission identification bit. When this parameter is '0', the B layer transmitted by the secondary polarization is used as the virtual D layer. To express this accurately, among the segments transmitted by the secondary polarization, a group of segments having the same segment number as the segments belonging to the B layer transmitted by the main polarization is treated as a D layer, which is a layer different from the B layer transmitted by the main polarization. When this parameter is '1', the B layer transmitted by the secondary polarization is not used as the virtual D layer but is used as the B layer.

[0162] Also, for example, the bit arranged at B121 is the E - layer transmission identification bit. When this parameter is '0', the C layer transmitted by the secondary polarization is used as the virtual E layer. To express this accurately, among the segments transmitted by the secondary polarization, a group of segments having the same segment number as the segments belonging to the C layer transmitted by the main polarization is treated as an E layer, which is a layer different from the C layer transmitted by the main polarization. When this parameter is '1', the C layer transmitted by the secondary polarization is not used as the virtual E layer but is used as the C layer.

[0163] In this way, in the broadcast receiving apparatus 100, it is possible to identify the presence or absence of the D layer and the E layer transmitted in the secondary polarization using the additional layer transmission identification bits (D layer transmission identification bits and / or E layer transmission identification bits). That is, in the terrestrial digital broadcast according to the present embodiment, by using the parameters of the additional layer transmission identification shown in FIG. 5J, it is possible to operate new layers (D layer and E layer in the example of FIG. 5J) beyond the number of layers limited to three layers of A layer, B layer, and C layer in the current terrestrial digital broadcast.

[0164] When 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 the virtual D layer / virtual E layer and the B layer / C layer. In this case, if the current / next information of the parameters such as the carrier modulation mapping method, convolutional coding rate, and time interleaving length regarding the virtual D layer / virtual E layer is transmitted using AC information (for example, AC1), the broadcast receiving apparatus 100 side can grasp the parameters such as the carrier modulation mapping method, convolutional coding rate, and time interleaving length regarding the virtual D layer / virtual E layer.

[0165] In addition, as a modification example, when the bits for additional layer transmission identification (D layer transmission identification bit and / or E layer transmission identification bit) are '0', the transmission parameters of the B layer and / or C layer of the current information / next information of the TMCC information transmitted in the secondary polarization may be configured to be switched to the meaning of the transmission parameters of the virtual D layer and / or virtual E layer. In this case, when the virtual D layer and / or virtual E layer are used, in the main polarization, the A layer, B layer, and C layer are used, and the transmission parameters of these layers may be transmitted by the current information / next information of the TMCC information transmitted in the main polarization. Also, in the secondary polarization, the A layer, D layer, and E layer are used, and the transmission parameters of these layers may be transmitted by the current information / next information of the TMCC information transmitted in the secondary polarization. Even in this case, on the broadcast receiving apparatus 100 side, parameters such as the carrier modulation mapping method, convolutional coding rate, and length of time interleaving related to the virtual D layer / virtual E layer can be grasped.

[0166] Also, when the broadcast wave to be transmitted is not an advanced terrestrial digital broadcast service, or even if it is an advanced terrestrial digital broadcast service but is a hierarchical division multiplexing transmission method, these parameters may be configured to be set to '1' respectively.

[0167] Note that the parameters for additional layer transmission identification may be stored in both the TMCC information of the main polarization and the TMCC information of the secondary polarization. However, as long as they are stored in at least the TMCC information of the secondary polarization, all of the above-described processes can be realized.

[0168] Also, the definitions of '0' and '1' of the bits for additional layer transmission identification described above may be reversed from the above description.

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

[0170] Also, in the broadcast wave to be transmitted, the above-mentioned bits for identifying the frequency conversion process, the physical channel number, the main signal, the 4K signal transmission, the additional layer transmission, etc. may be set to '1' for all bits as a principle when the above-mentioned system identification parameter is not '10'. Even if the system identification parameter is not '10', but exceptionally due to some problem, if the bits for identifying the frequency conversion process, the physical channel number, the main signal, the 4K signal transmission, or the additional layer transmission are not '1', the broadcast receiving apparatus 100 may be configured to ignore the bits that are not '1' and determine that all these bits are '1'.

[0171] FIG. 5K shows an example of the assignment of the "coding rate" bits shown in FIG. 5C, that is, the bits for identifying the coding rate of error correction.

[0172] Here, in the current terrestrial digital broadcast system for 2K broadcasts, identification bits for transmitting the coding rate dedicated to the "convolutional code" are transmitted. However, in the digital broadcast according to this embodiment, the advanced terrestrial digital broadcast service for 4K broadcasts can be broadcast in a mixed manner with the terrestrial digital broadcast service for 2K broadcasts. And as already explained, in the advanced terrestrial digital broadcast service for 4K broadcasts, LDPC codes can be used as inner codes.

[0173] Therefore, unlike the convolutional code dedicated coding rate identification bits in the current 2K broadcast terrestrial digital broadcast system, the coding rate identification bits for error correction according to this embodiment shown in FIG. 5K are configured to support LDPC codes as well.

[0174] Here, whether the inner code of the target terrestrial digital broadcast service is a convolutional code or an LDPC code, by setting the bits arranged in the common range as the identification bits for coding rate transmission, bit number savings can be achieved. Furthermore, even for the same identification bits, by independently setting the coding rate when the inner code of the target terrestrial digital broadcast service is a convolutional code and when it is an LDPC code, as a digital broadcast system, a selection group of coding rates suitable for each coding method can be adopted.

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

[0176] Note that the identification of whether the inner code of the target terrestrial digital broadcast service is a convolutional code or an LDPC code may be performed using the result of identifying whether the terrestrial digital broadcast service is a current terrestrial digital broadcast service or an advanced terrestrial digital broadcast service. This identification may be performed using the identification bits described in FIG. 5D or FIG. 5I. Here, if it is identified that the inner code is a convolutional code when the target terrestrial digital broadcast service is a current terrestrial digital broadcast service. Also, if it is identified that the inner code is an LDPC code when the target terrestrial digital broadcast service is an advanced terrestrial digital broadcast service.

[0177] Also, as another example of the identification of whether the inner code of the target terrestrial digital broadcast service is a convolutional code or an LDPC code, it may be identified based on the identification bits of the error correction method, which will be described later with reference to FIG. 6I.

[0178] According to the bits of the error correction coding rate identification shown in FIG. 5K described above, it is possible to prevent an increase in the number of bits of the identification bits while corresponding to a plurality of inner code schemes, which is preferable.

[0179] Also, in the advanced terrestrial digital broadcast service of the polarization multiplexing transmission method, the TMCC information of the transmission wave transmitted in the horizontal polarization and the TMCC information of the transmission wave transmitted in the vertical polarization may be the same or different. Similarly, in the advanced terrestrial digital broadcast service of the hierarchical division multiplexing transmission method, the TMCC information of the transmission wave transmitted in the upper layer and the TMCC information of the transmission wave transmitted in the lower layer may be the same or different. Also, the above-described parameters for frequency conversion processing identification, main signal identification, additional layer transmission identification, etc. may be described only in the TMCC information of the transmission wave transmitted in the secondary polarization or the transmission wave transmitted in the lower layer.

[0180] In the above description, an example where the parameters for frequency conversion process identification, main signal identification, polarization direction identification, first signal and second signal identification, upper and lower layer identification, 4K signal transmission layer identification, and additional layer transmission identification are included in the TMCC signal (TMCC carrier) and transmitted has been described. However, these parameters may be included in the AC signal (AC carrier) and transmitted. That is, these parameters may be transmitted by a signal of a carrier (such as TMCC carrier, AC carrier) 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, such as additional information related to the transmission control of the modulated wave or earthquake warning information. Note that the earthquake warning information is transmitted using the AC carrier of segment 0. On the other hand, the additional information related to the transmission control of the modulated wave can be transmitted using any AC carrier. FIG. 6A shows an example of the bit assignment of the 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 for transmitting additional information related to the transmission control of the modulated wave or earthquake warning information.

[0182] FIG. 6B shows an example of bit assignment for identifying the configuration of an 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 configuration identification parameter ('001' or '110') when transmitting earthquake motion warning information has the same code as the first 3 bits (B1 to B3) of the synchronization signal of the TMCC signal, and is alternately sent frame by 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 regarding the transmission control of the modulated wave is being transmitted using B4 to B203 of the AC signal. It is also possible to transmit additional information regarding the transmission control of the modulated wave using B4 to B203 of the AC signal. In this case, the configuration identification parameter of the AC signal alternately sends '000' and '111', or '010' and '101', or '011' and '100', frame by frame.

[0183] B4 to B203 of the AC signal are used for transmitting additional information regarding the transmission control of the modulated wave or for transmitting earthquake motion warning information.

[0184] The transmission of additional information regarding the transmission control of the modulated wave may be performed with various bit configurations. For example, frequency conversion process identification, physical channel number identification, main signal identification, 4K signal transmission layer identification, additional layer transmission identification, etc., as described in the explanation of the TMCC signal, may have bits assigned to the additional information regarding the transmission control of the modulated wave of the AC signal instead of or in addition to the TMCC signal for transmission. In this way, in the broadcast receiving apparatus 100, various identification processes already described in the explanation of the TMCC signal can be performed using these parameters. Also, transmission parameter additional information regarding the transmission layer of the 4K broadcast program when any parameter of the 4K signal transmission layer identification is '0', or current / next information of the transmission parameters regarding the virtual D layer / virtual E layer when any parameter of the additional layer transmission identification is '0' may be assigned. In this way, in the broadcast receiving apparatus 100, the transmission parameters of each layer can be obtained using these parameters, and the demodulation process of each layer can be controlled.

[0185] The transmission of seismic motion warning information may be performed according to the bit allocation shown in FIG. 6C. The seismic motion warning information is composed of a synchronization signal, a start / end flag, an update flag, signal identification, detailed seismic motion warning information, CRC, parity bit, etc. The synchronization signal is composed of a 13-bit code and is the same as the 13-bit (B4 to B16) code of the synchronization signal of the TMCC signal except for the first 3 bits of the synchronization signal. When the configuration identification of the AC signal indicates that the seismic motion warning information is transmitted, the 16-bit code combining the configuration identification and the synchronization signal becomes the same 16-bit synchronization word as the synchronization signal of the TMCC. The start / end flag is a flag for the start timing / end timing of the seismic motion warning information and is composed of a 2-bit code. The start / end flag is changed from '11' to '00' at the start of the transmission of the seismic motion warning information and is changed from '00' to '11' at the end of the transmission of the seismic motion warning information. The update flag is composed of a 2-bit code and is incremented by 1 with '00' as the initial value each time the content of a series of detailed seismic motion warning information transmitted when the start / end flag is '00' changes. It is assumed that it returns to '00' after '11'. When the start / end flag is '11', the update flag is also '11'.

[0186] FIG. 6D shows an example of the bit allocation of the signal identification. The signal identification is composed of a 3-bit code and is used to identify the type of the detailed seismic motion warning information. When this parameter is '000', it means 'detailed seismic motion warning information (with the affected area)'. When this parameter is '001', it means 'detailed seismic motion warning information (without the affected area)'. When this parameter is '010', it means 'test signal of the detailed seismic motion warning information (with the affected area)'. When this parameter is '011', it means 'test signal of the detailed seismic motion warning information (without the affected area)'. When this parameter is '111', it means 'no detailed seismic motion warning information'. Note that when the start / end flag is '00', the signal identification is '000' or '001' or '010' or '011'. When the start / end flag is '11', the signal identification is '111'.

[0187] The earthquake motion warning detailed information is composed of an 88-bit code. When the signal identification is '000', '001', '010', or '011', the earthquake motion warning detailed information transmits information regarding the current time when the earthquake motion warning information is sent, information indicating the area targeted by the earthquake motion warning, information such as the latitude / longitude / seismic intensity of the epicenter of the earthquake targeted by the earthquake motion warning, etc. An example of the bit assignment of the earthquake motion warning detailed information when the signal identification is '000', '001', '010', or '011' is shown in FIG. 6E. Also, when the signal identification is '111', it is possible to transmit a code for identifying a broadcaster, etc., using the bits of the earthquake motion warning detailed information. An example of the bit assignment of the earthquake motion warning detailed information when the signal identification is '111' is shown in FIG. 6F.

[0188] The CRC is a code generated using a predetermined generating polynomial for B21 to B111 among the earthquake motion warning information. The parity bit is a code generated by a shortened code (187, 105) of a difference set cyclic code (273, 191) for B17 to B121 among the earthquake motion warning information.

[0189] In the broadcast receiving device 100, it is possible to perform various controls for coping with an emergency using the parameters related to the earthquake motion warning described in FIGS. 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 the display content with a low priority to the display related to the earthquake motion warning, control for ending the display of an application and switching to the display related to the earthquake motion warning or the broadcast program video, etc.

[0190] Fig. 6G shows an example of bit allocation of additional information related to the transmission control of a modulated wave. The additional information related to the transmission control of a modulated wave is composed of a synchronization signal, current information, next information, parity bits, etc. The synchronization signal is composed of a 13-bit code, which is the same as the 13 bits (B4 to B16) excluding the first 3 bits of the synchronization signal of the TMCC signal. When it is indicated that the configuration identification of the AC signal transmits the additional information related to the transmission control of the modulated wave, the 16-bit code combining the configuration identification and the synchronization signal becomes a 16-bit synchronization word conforming to the synchronization signal of the TMCC. The current information indicates the current information of the transmission parameter additional information when transmitting a 4K broadcast program in the B layer or the C layer, or the transmission parameters related to the virtual D layer or the virtual E layer. The next information indicates the information after switching of the transmission parameter additional information when transmitting a 4K broadcast program in the B layer or the C layer, or the transmission parameters related to the virtual D layer or the virtual E layer.

[0191] In the example of Fig. 6G, B18 to B30 of the current information are the current information of the B layer transmission parameter additional information, indicating the current information of the transmission parameter additional information when transmitting a 4K broadcast program in the B layer. Also, B31 to B43 of the current information are the current information of the C layer transmission parameter additional information, indicating the current information of the transmission parameter additional information when transmitting a 4K broadcast program in the C layer. Also, B70 to B82 of the next information are the information after switching of the transmission parameters of the B layer transmission parameter additional information, indicating the information after switching of the transmission parameters of the transmission parameter additional information when transmitting a 4K broadcast program in the B layer. Also, B83 to B95 of the next information are the information after switching of the transmission parameters of the C layer transmission parameter additional information, indicating the information after switching of the transmission parameters of the transmission parameter additional information when transmitting a 4K broadcast program in the C layer. Here, the transmission parameter additional information is the transmission parameter related to modulation, which expands the specification by adding to the transmission parameters of the TMCC information shown in Fig. 5C. The specific content of the transmission parameter additional information will be described later.

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

[0193] The virtual D layer and the virtual E layer are layers that do not exist in the current terrestrial digital broadcast. Since the TMCC information in FIG. 5B needs to maintain compatibility with the current terrestrial digital broadcast, it is not easy to increase the number of bits. Therefore, in the embodiment of the present invention, the transmission parameters for the virtual D layer and the virtual E layer are stored in the AC information as shown in FIG. 6G instead of the TMCC information.

[0194] Thereby, it becomes possible to transmit information regarding modulation for the new virtual D layer and virtual E layer to the receiving apparatus while maintaining the compatibility of the TMCC information with the current terrestrial digital broadcast. Thereby, in the broadcast wave of the polarization - dual terrestrial digital broadcast service according to the present embodiment, when the B - layer / C - layer of the transmission wave transmitted on the secondary polarization is used as the virtual D layer / virtual E layer, it becomes possible to set the transmission parameters of the virtual D layer / virtual E layer of the transmission wave transmitted on the secondary polarization to be different from the transmission parameters of the B - layer / C - layer of the transmission wave transmitted on the main polarization.

[0195] In the case where the virtual D layer or the virtual E layer is not used, the broadcast receiving apparatus 100 may ignore the information on the transmission parameters for the unused layer without any problem. For example, for the virtual D layer or the virtual E layer, when the parameter of the additional layer transmission identification of the TMCC information in FIG. 5J indicates '1' (indicating that the virtual D layer / virtual E layer is not used), the broadcast receiving apparatus 100 may be configured to ignore any value in the transmission parameters shown in FIG. 6G for the unused virtual D layer or virtual E layer.

[0196] Next, the details of the transmission parameter addition information described with reference to FIG. 6G will be described.

[0197] FIG. 6H shows a specific example of the transmission parameter addition information. The transmission parameter addition information may include parameters such as an error correction method parameter and a constellation format parameter.

[0198] The error correction method indicates what kind of coding method is used as the error correction method for the inner code and the outer code when transmitting a 4K broadcast program (advanced terrestrial digital broadcast service) in the B layer or the C layer. FIG. 6I shows an example of the bit assignment of the error correction method. When this parameter is '000', when transmitting a 4K broadcast program in the B layer or the C layer, a convolutional code is used as the inner code and a shortened RS code is used as the outer code. When this parameter is '001', when transmitting a 4K broadcast program in the B layer and the C layer, an LDPC code is used as the inner code and a BCH code is used as the outer code. Other combinations may be set and selected as well.

[0199] Also, when transmitting 4K broadcast programs in the B layer and C layer, it is possible to adopt not only a uniform constellation but also a non-uniform constellation (Non Uniform Constellation: NUC) as the carrier modulation mapping method. Fig. 6J shows an example of bit allocation in the constellation format. When this parameter is '000', the carrier modulation mapping method selected by the transmission parameters of the TMCC information is applied with a uniform constellation. When this parameter is any one of '001' to '111', the carrier modulation mapping method selected by the transmission parameters of the TMCC information is applied with a non-uniform constellation. Note that when applying a non-uniform constellation, the optimal value of the non-uniform constellation differs according to the type of error correction method and its coding rate, etc. Therefore, when the parameter of the constellation format is any one of '001' to '111', the broadcast receiving apparatus 100 of this embodiment may determine the non-uniform constellation used in the demodulation process based on the parameters of the carrier modulation mapping method, the parameters of the error correction method, and the coding rate parameters. This determination may be made by referring to a predetermined table pre-stored in the broadcast receiving apparatus 100, etc.

[0200] [Transmission Method 1 of Advanced Terrestrial Digital Broadcasting Service] In order to realize 4K (horizontal 3840 pixels × vertical 2160 pixels) broadcasting while maintaining the viewing environment of the current terrestrial digital broadcasting service, as an example of the transmission method of the advanced terrestrial digital broadcasting service according to an embodiment of the present invention, a polarization - dual transmission method will be described. The polarization - dual 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 bandwidth of approximately 6 MHz corresponding to one physical channel are divided. Among them, 7 segments are used for transmitting 2K (horizontal 1920 pixels × vertical 1080 pixels) broadcast programs, 5 segments are used for transmitting 4K broadcast programs, and 1 segment is used for mobile reception (so - called one - segment broadcast). Further, for the 5 segments for 4K broadcasting, not only horizontal - polarized signals but also vertical - polarized signals are used, and a total transmission capacity of 10 segments is ensured by MIMO (Multiple - Input Multiple - Output) technology. Note that for 2K broadcast programs, image quality is maintained by optimizing the latest MPEG - 2 Video compression technology, etc., so that they can be received by current TV receivers. For 4K broadcast programs, image quality is ensured by optimizing the more efficient HEVC compression technology than MPEG - 2 Video and increasing the modulation level, etc. Note that the number of segments allocated for each broadcast may be different from that described above.

[0201] FIG. 7A shows an example of the polarization - dual transmission method in the advanced terrestrial digital broadcasting service according to an embodiment of the present invention. A frequency band of 470 - 710 MHz is used for transmitting the broadcast wave of the terrestrial digital broadcasting service. The number of physical channels in the said frequency band is 40 channels from 13 to 52ch, and each physical channel has a bandwidth of 6 MHz. In the polarization - dual transmission method according to an embodiment of the present invention, both horizontal - polarized signals and vertical - polarized signals are used within one physical channel.

[0202] FIG. 7A shows two examples, (1) and (2), of the 13-segment allocation. In the example of (1), the segments 1 to 7 (B layer) of the horizontally polarized signal are used to transmit a 2K broadcast program. A total of 10 segments, including the segments 8 to 12 (C layer) of the horizontally polarized signal and the segments 8 to 12 (C layer) of the vertically polarized signal, are used to transmit a 4K broadcast program. The segments 1 to 7 (B layer) of the vertically polarized signal may be used to transmit the same broadcast program as the 2K broadcast program transmitted by the segments 1 to 7 (B layer) of the horizontally polarized signal. Alternatively, the segments 1 to 7 (B layer) of the vertically polarized signal may be used to transmit a broadcast program different from the 2K broadcast program transmitted by the segments 1 to 7 (B layer) of the horizontally polarized signal. Alternatively, the segments 1 to 7 (B layer) of the vertically polarized signal may be used for other data transmission or may not be used. The identification information on how to use the segments 1 to 7 (B layer) of the vertically polarized signal can be transmitted to the receiving device side by the parameters such as the 4K signal transmission layer identification of the TMCC signal and the additional layer transmission identification described above. In the broadcast receiving device 100, these parameters can be used to identify the handling of the segments 1 to 7 (B layer) of the vertically polarized signal. Also, the 2K broadcast program transmitted using the B layer of the horizontally polarized signal and the 4K broadcast program transmitted using the C layer of the horizontally / vertically polarized signals may be simulcast that transmits the same content broadcast program at different resolutions, or may transmit different content broadcast programs. The segment 0 of the horizontally / vertically polarized signals is used to transmit the same one-segment broadcast program.

[0203] The example of (2) in Fig. 7A is a variant different from (1). In the example of (2), a 4K broadcast program is transmitted using a total of 10 segments, namely segments 1 to 5 (B layer) of the horizontally polarized signal and segments 1 to 5 (B layer) of the vertically polarized signal. A 2K broadcast program is transmitted using segments 6 to 12 (C layer) of the horizontally polarized signal. Also in the example of (2), segments 6 to 12 (C layer) of the vertically polarized signal may be used for transmitting the same broadcast program as the 2K broadcast program transmitted by segments 6 to 12 (C layer) of the horizontally polarized signal, or may be used for transmitting a different broadcast program from the 2K broadcast program transmitted by segments 6 to 12 (C layer) of the horizontally polarized signal. Further, segments 6 to 12 (C layer) of the vertically polarized signal may be used for other data transmission or may not be used. Since these identification information is the same as that in the example of (1), the description will not be repeated.

[0204] Note that both the examples of (1) and (2) in Fig. 7A illustrate the cases where the horizontal polarization is the main polarization. However, depending on the operation, the horizontal polarization and the vertical polarization may be reversed.

[0205] Fig. 7B shows an example of the configuration of a broadcast system for an advanced terrestrial digital broadcast service using the polarization-duplex transmission method according to an embodiment of the present invention. This shows both the transmission-side system and the reception-side system of the advanced terrestrial digital broadcast service using the polarization-duplex transmission method. The configuration of the broadcast system for the advanced terrestrial digital broadcast service using the polarization-duplex transmission method is basically the same as the configuration of the broadcast system shown in Fig. 1, but the radio tower 300T, which is equipment of the broadcast station, becomes a polarization-sharing transmission antenna capable of simultaneously sending a horizontally polarized signal and a vertically polarized signal. Also in the example of Fig. 7B, only the station selection / detection unit 131H and the station selection / detection unit 131V of the second tuner / demodulation unit 130T of the broadcast receiving device 100 are excerpted and described, and the description of other operation units is omitted.

[0206] The horizontally polarized signal transmitted from the radio tower 300T is received by the horizontally polarized receiving element of the antenna 200T, which is a polarization-sharing receiving antenna, and is input from the connector part 100F1 to the station selection / detection part 131H via the coaxial cable 202T1. On the other hand, the vertically polarized signal transmitted from the radio tower 300T is received by the vertically polarized receiving element of the antenna 200T and is input from the connector part 100F2 to the station selection / detection part 131V via the coaxial cable 202T2. It is common to use F-type connectors for the connector parts that connect the antenna (coaxial cable) and the TV receiver.

[0207] Here, there is also a possibility that the user may accidentally connect the coaxial cable 202T1 to the connector part 100F2 and the coaxial cable 202T2 to the connector part 100F1. In this case, problems such as the station selection / detection part 131H and the station selection / detection part 131V being unable to identify whether the input broadcast signal is a horizontally polarized signal or a vertically polarized signal may occur. In order to prevent the above problems, one of the connector parts that connect the antenna (coaxial cable) and the TV receiver, for example, the coaxial cable 202T2 that transmits the vertically polarized signal and the connector part of the connector part 100F2, may be made into a connector part with a shape different from the F-type connector of the coaxial cable 202T1 that transmits the horizontally polarized signal and the connector part of the connector part 100F1. Alternatively, the station selection / detection part 131H and the station selection / detection part 131V may be controlled to operate by identifying whether the input broadcast signal is a horizontally polarized signal or a vertically polarized signal by referring to the main signal identification of the TMCC information of each input signal.

[0208] FIG. 7C shows an example of a configuration different from the above-described configuration of a broadcast system for an advanced terrestrial digital broadcast service using the polarization - dual - use transmission method according to an embodiment of the present invention. In the configuration shown in FIG. 7B, where the broadcast receiving apparatus 100 is provided with two broadcast signal input connectors and two coaxial cables are used for the connection between the antenna 200T and the broadcast receiving apparatus 100, this configuration may not always be suitable in terms of equipment cost and handling during cable wiring. Therefore, in the configuration shown in FIG. 7C, the horizontal polarization signal received by the horizontal polarization receiving element of the antenna 200T and the vertical polarization signal received by the vertical polarization receiving element of the antenna 200T are input to a conversion unit (converter) 201T, and the connection between the conversion unit 201T and the broadcast receiving apparatus 100 is made with a single coaxial cable 202T3. The broadcast signal input from the connector unit 100F3 is split and input to the station selection / detection unit 131H and the station selection / detection unit 131V. The connector unit 100F3 may have a function of supplying operating power to the conversion unit 201T.

[0209] The conversion unit 201T may belong to the equipment in the environment (such as an apartment house, etc.) where the broadcast receiving apparatus 100 is installed. Or, it may be configured as a device integrated with the antenna 200T and installed in a house or the like. The conversion unit 201T performs frequency conversion processing on either the horizontal polarization signal received by the horizontal polarization receiving element of the antenna 200T or the vertical polarization signal received by the vertical polarization receiving element of the antenna 200T. By this processing, the horizontal polarization signal and the vertical polarization signal transmitted from the radio tower 300T to the antenna 200T using the horizontal polarization and vertical polarization in the same frequency band are separated into different frequency bands from each other, and can be simultaneously transmitted to the broadcast receiving apparatus 100 through a single coaxial cable 202T3. Note that, if necessary, frequency conversion processing may be performed on both the horizontal polarization signal and the vertical polarization signal, but in this case, the frequency bands of the two after frequency conversion must also be different from each other. Also, the broadcast receiving apparatus 100 only needs to be provided with 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 the vertically polarized signal. Specifically, among the horizontally polarized signal and the vertically polarized signal transmitted in the frequency band of 470 to 710 MHz (the band corresponding to channels 13 to 52 of UHF), the frequency band of the vertically polarized signal is converted from the frequency band of 470 to 710 MHz to the frequency band of 770 to 1010 MHz. By this processing, signals transmitted using horizontally polarized waves and vertically polarized waves in the same frequency band can be simultaneously transmitted to the broadcast receiving apparatus 100 through a single coaxial cable 202T3 without interfering with each other. Note that frequency conversion processing may be performed on the horizontally polarized signal.

[0211] Further, it is preferable that the frequency conversion processing is performed on the signal transmitted in the secondary polarization according to 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 main polarization is more likely to be transmitted including the current terrestrial digital broadcast service than the signal transmitted in the secondary polarization. Therefore, in order to more suitably maintain compatibility with the current terrestrial digital broadcast service, it can be said that it is preferable to perform frequency conversion on the signal transmitted in the secondary polarization without performing frequency conversion on the signal transmitted in the main polarization.

[0212] Also, when performing frequency conversion on the signal transmitted in the secondary polarization, it is desirable to set the frequency band of the signal transmitted in the secondary polarization higher than the frequency band of the signal transmitted in the main polarization in the converted signal. Thereby, in the initial scan of the broadcast receiving apparatus 100, if the scan starts from the low frequency side and proceeds to the high frequency side, the initial scan can be performed on the signal transmitted in the main polarization earlier than the signal transmitted in the secondary polarization. Thereby, processing for reflecting the setting by the initial scan of the current terrestrial digital broadcast service in the setting by the initial scan of the advanced terrestrial digital broadcast service can be performed more suitably.

[0213] Also, the frequency conversion process may be performed for all physical channels used in the advanced terrestrial digital broadcast service, or may be performed only for physical channels using signal transmission by the polarization multiplexing transmission method.

[0214] Note that the frequency band after conversion by the frequency conversion process is preferably between 710 and 1032 MHz. That is, when attempting to receive the terrestrial digital broadcast service and the BS / CS digital broadcast service simultaneously, it is conceivable to mix the broadcast signal of the terrestrial digital broadcast service received by the antenna 200T and the broadcast signal of the BS / CS digital broadcast service received by the antenna 200B and transmit them to the broadcast receiving apparatus 100 via a single 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 conversion by the frequency conversion process is set to be between 710 and 1032 MHz, it is possible to avoid interference between the horizontal polarization signal and the vertical polarization signal, and also avoid interference between the broadcast signal of the terrestrial digital broadcast service and the broadcast signal of the BS / CS digital broadcast service. Further, considering the reception of retransmission broadcast signals by a cable television (Community Antenna TV or Cable TV: CATV) station, etc., since a frequency band of 770 MHz or less (a band corresponding to channel 62 or less of UHF) is used in the television broadcast distribution by the cable television station, it is more preferable to set the frequency band after conversion by the frequency conversion process to be between 770 and 1032 MHz, which exceeds the band corresponding to channel 62 of UHF.

[0215] Also, the bandwidth of the region (part a in the figure) between the frequency band before conversion and the frequency band after conversion by the frequency conversion process is preferably set to be an integer multiple of the bandwidth (6 MHz) of one physical channel. By doing so, in the broadcast receiving apparatus 100, there are advantages such as facilitating frequency setting control when performing a frequency scan collectively for the broadcast signal in the frequency band before conversion and the broadcast signal in the frequency band after conversion by the frequency conversion process.

[0216] Note that, as described above, in the polarization - dual transmission method according to the embodiment of the present invention, both a horizontal polarization signal and a vertical polarization signal are used for transmitting a 4K broadcast program. Therefore, in order to correctly reproduce a 4K broadcast program, on the receiving side, it is necessary 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 frequency conversion processing is performed and the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization for the same physical channel are input to the receiving device as signals in different frequency bands, in the broadcast receiving device 100 of the present embodiment, by appropriately referring to the parameters of the TMCC information shown in FIGS. 5F to 5J (for example, main signal identification and physical channel number identification), it is possible to correctly grasp the combination of the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization for the same physical channel. Thereby, the broadcast receiving device 100 of the present embodiment can suitably receive, demodulate, and reproduce a 4K broadcast program.

[0217] Note that, in the examples of FIGS. 7B, 7C, and 7D, all of them have described the examples when the horizontal polarization is the main polarization. However, depending on the operation, the horizontal polarization and the vertical polarization may be reversed.

[0218] Note that the broadcast wave of the terrestrial digital broadcast transmitted by the polarization - dual transmission method described above can be received and reproduced by the second tuner / demodulation unit 130T of the broadcast receiving device 100 as described above, but can also be received by the first tuner / demodulation unit 130C of the broadcast receiving device 100. When the broadcast wave of the terrestrial digital broadcast is received by the first tuner / demodulation unit 130C, among the broadcast signals of the broadcast wave of the terrestrial digital broadcast, the broadcast signals transmitted in the layer of the advanced terrestrial digital broadcast service are ignored, but the broadcast signals transmitted in the layer of the current terrestrial digital broadcast service are reproduced.

[0219] <Pass - through Transmission Method of Advanced Terrestrial Digital Broadcast Service> The broadcast receiving apparatus 100 is capable of receiving a signal transmitted by a pass-through transmission method. The pass-through transmission method is a method in which a broadcast signal received by a cable TV station or the like is transmitted to a CATV distribution system in the same signal format, at the same frequency or after frequency conversion.

[0220] The pass-through method includes: (1) a method in which the transmission signal band of each terrestrial digital broadcast signal output from a terrestrial wave receiving antenna is extracted and level-adjusted, and then transmitted to a CATV facility at the same frequency as the transmission signal frequency; and (2) a method in which the transmission signal band of each terrestrial digital broadcast signal output from a terrestrial wave receiving antenna is extracted and level-adjusted, and then transmitted to a CATV facility at a frequency in the VHF band, MID band, SHB band, or UHF band set by the CATV facility administrator. The device constituting the receiving amplifier for performing the signal processing of the first method or the devices constituting the receiving amplifier and frequency converter for performing the signal processing of the second method are OFDM signal processors (OFDM Signal Processor: OFDM-SP).

[0221] FIG. 7E shows an example of a system configuration when the first method of the pass-through transmission method is applied to the advanced terrestrial digital broadcast service of the polarization multiplexing transmission method. FIG. 7E shows the head-end facility 400C of a cable TV station and the broadcast receiving apparatus 100. Further, FIG. 7F shows an example of the frequency conversion process at that time. The notation (H·V) in FIG. 7F indicates a state of a broadcast signal in which both the broadcast signal transmitted in the horizontal polarization and the broadcast signal transmitted in the vertical polarization exist in the same frequency band, the notation (H) indicates the broadcast signal transmitted in the horizontal polarization, and the notation (V) indicates the broadcast signal transmitted in the vertical polarization. The notations in FIGS. 7H and 7I hereinafter have the same meaning.

[0222] When applying the pass - through transmission of the first method to the polarization - multiplexed transmission method of the terrestrial digital broadcasting service in the embodiment of the present invention, for the broadcast signal transmitted in the horizontal polarization, signal band extraction and level adjustment are performed in the head - end facility 400C of the cable TV station, and transmission is performed at the same frequency as the transmission signal frequency. On the other hand, for the broadcast signal transmitted in the vertical polarization, signal band extraction and level adjustment are performed in the head - end facility 400C of the cable TV station, and after performing frequency conversion processing similar to the description in FIG. 7D (processing for converting the broadcast signal transmitted in the vertical polarization to a frequency band higher than the frequency band of 470 - 770 MHz corresponding to channels 13 - 62 of UHF), transmission is performed. By this processing, the frequency bands of the broadcast signal transmitted in the horizontal polarization and the broadcast signal transmitted in the vertical polarization do not overlap, so signal transmission with a single coaxial cable (or optical fiber cable) becomes possible. The transmitted signal can be received by the broadcast receiving apparatus 100 of the present embodiment. In the broadcast receiving apparatus 100 of the present embodiment, the process of receiving and demodulating the broadcast signal transmitted in the horizontal polarization and the broadcast signal transmitted in the vertical polarization included in the signal is the same as the description in FIG. 7D, so the description will be omitted again.

[0223] FIG. 7G shows an example of the system configuration when applying the second method of the pass - through transmission method to the terrestrial digital broadcasting service of the polarization - multiplexed transmission method. FIG. 7G shows the head - end facility 400C of the cable TV station and the broadcast receiving apparatus 100. Also, FIG. 7H shows an example of the frequency conversion processing at that time.

[0224] When applying the pass - through transmission of the second method to the high - definition terrestrial digital broadcast service of the polarization - dual - use transmission method according to an embodiment of the present invention, for the broadcast signal transmitted in the horizontal polarization, signal band extraction and level adjustment are performed in the head - end facility 400C of the cable TV station, and after performing frequency conversion processing to the frequency set by the CATV facility manager, it is sent out. On the other hand, for the broadcast signal transmitted in the vertical polarization, signal band extraction and level adjustment are performed in the head - end facility 400C of the cable TV station, and frequency conversion processing similar to the description of FIG. 7D (processing of converting the broadcast signal transmitted in the vertical polarization to a frequency band higher than the frequency band of 470 - 770 MHz, which is the band of UHF channels 13 - 62) is performed, and then it is sent out. The frequency conversion processing shown in FIG. 7H, different from FIG. 7F, is such that the broadcast signal transmitted in the horizontal polarization does not stay within the frequency band of 470 - 770 MHz, which is the band of UHF channels 13 - 62, but the frequency conversion is performed so as to expand the range to a lower frequency band and rearrange it in the range of 90 - 770 MHz. By this processing, the frequency bands of the broadcast signal transmitted in the horizontal polarization and the broadcast signal transmitted in the vertical polarization do not overlap, so that signal transmission with a single coaxial cable (or optical fiber cable) becomes possible. The transmitted signal can be received by the broadcast receiving apparatus 100 of the present embodiment. In the broadcast receiving apparatus 100 of the present embodiment, the process of receiving and demodulating the broadcast signal transmitted in the horizontal polarization and the broadcast signal transmitted in the vertical polarization included in the signal is the same as the description of FIG. 7D, so the description is omitted again.

[0225] Also, as another modification example of the frequency conversion process of the head - end equipment 400C of the cable TV station in FIG. 7G, the broadcast signal at the time of pass - through output after frequency conversion may be changed to the state shown in FIGS. 7H to 7I. In this case, for both the broadcast signal transmitted in horizontal polarization and the broadcast signal transmitted in vertical polarization, signal band extraction and level adjustment are performed, and after performing the frequency conversion process to the frequency set by the CATV facility manager, transmission may be carried out. In the example of FIG. 7I, frequency conversion is performed so as to rearrange both the broadcast signal transmitted in horizontal polarization and the broadcast signal transmitted in vertical polarization in the range of 90 to 770 MHz (the range from VHF1ch to UHF62ch). Since the frequency band beyond UHF62ch is not used, the frequency band utilization efficiency of the broadcast signal is higher than that in FIG. 7H.

[0226] Also, since the band for rearranging the broadcast signal is wider than the frequency band of 470 to 710 MHz, which is the band of UHF channels 13ch to 52ch at the time of antenna reception, as shown in the example of FIG. 7I, it is also possible to alternately rearrange the broadcast signal transmitted in horizontal polarization and the broadcast signal transmitted in vertical polarization. At this time, as shown in the example of FIG. 7I, if the pairs of the broadcast signal transmitted in horizontal polarization and the broadcast signal transmitted in vertical polarization, which were the same physical channel at the time of antenna reception, are alternately rearranged in the order of the physical channels at the time of antenna reception, when the broadcast receiving apparatus 100 of this embodiment performs an initial scan from the low - frequency side, the pairs of the broadcast signal transmitted in horizontal polarization and the broadcast signal transmitted in vertical polarization, which were originally the same physical channel, can be initially set in order in the unit of the same physical channel, and the initial scan can be performed efficiently.

[0227] Note that the examples of FIGS. 7E, 7F, 7G, 7H, and 7I all illustrate examples when the horizontal polarization is the main polarization. However, depending on the operation, the horizontal polarization and the vertical polarization may be reversed.

[0228] Regarding the broadcast wave of the polarization - multiplexed transmission system using the pass - through transmission system described above, as described above, it can be received and played back by the second tuner / demodulation unit 130T of the broadcast receiving apparatus 100, but it can also be received by the first tuner / demodulation unit 130C of the broadcast receiving apparatus 100. When the broadcast wave of the terrestrial digital broadcast is received by the first tuner / demodulation unit 130C, among the broadcast signals of the broadcast wave of the terrestrial digital broadcast, the broadcast signals transmitted in the layer of the advanced terrestrial digital broadcast service are ignored, but the broadcast signals transmitted in the layer of the current terrestrial digital broadcast service are played back.

[0229] [Transmission method 2 of advanced terrestrial digital broadcast service] In order to realize 4K broadcast while maintaining the viewing environment of the current terrestrial digital broadcast service, as an example different from the above - mentioned transmission method of the advanced terrestrial digital broadcast service according to the embodiments of the present invention, a hierarchical division multiplexing transmission method will be described. The hierarchical division multiplexing transmission method according to the embodiments of the present invention is a method that has some specifications in common with the current terrestrial digital broadcast method. For example, the broadcast wave of the 4K broadcast service with a low signal level is multiplexed and transmitted on the same channel as the broadcast wave of the current 2K broadcast service. Note that the 2K broadcast suppresses the reception level of the 4K broadcast below the required C / N and performs reception as before. For the 4K broadcast, while expanding the transmission capacity by modulation multileveling, etc., a reception technology corresponding to the LDM (hierarchical division multiplexing) technology is used to cancel the 2K broadcast wave and perform reception with the remaining 4K broadcast wave.

[0230] Fig. 8A shows an example of a hierarchical division multiplex transmission method in an advanced terrestrial digital broadcast service according to an embodiment of the present invention. The upper layer is composed of modulated waves of current 2K broadcasts, the lower layer is composed of modulated waves of 4K broadcasts, the upper layer and the lower layer are multiplexed, and output as a composite wave in the same frequency band. For example, 64QAM or the like may be used as the modulation method in the upper layer, and 256QAM or the like may be used as the modulation method in the lower layer. Note that the 2K broadcast program transmitted using the upper layer and the 4K broadcast program transmitted using the lower layer may be simulcast that transmits broadcast programs of the same content at different resolutions, or may transmit broadcast programs of different content. Here, the upper layer is transmitted at high power, and the lower layer is transmitted at low power. Note that the difference (power difference) between the modulation wave levels of the upper layer and the lower layer is called the injection level (IL: Injection Level), which is a value set on the broadcast station side. The injection level is generally expressed as a relative ratio (dB) in logarithmic form of the difference (power difference) between the modulation wave levels.

[0231] Fig. 8B shows an example of the configuration of a broadcast system for an advanced terrestrial digital broadcast service using the hierarchical division multiplex transmission method according to an embodiment of the present invention. The configuration of the broadcast system for the advanced terrestrial digital broadcast service using the hierarchical division multiplex transmission method is basically the same as the configuration of the broadcast system shown in Fig. 1, but the radio tower 300L, which is equipment of the broadcast station, is a transmission antenna that transmits a broadcast signal multiplexing the 2K broadcast of the upper layer and the 4K broadcast of the lower layer. Also, in the example of Fig. 8B, the broadcast receiving apparatus 100 describes only the channel selection / detection unit 131L of the third tuner / demodulation unit 130L, and omits the description of other operation units.

[0232] The broadcast signal received by the antenna 200L is input from the connector section 100F4 to the channel selection / detection section 131L via the conversion section (converter) 201L and the coaxial cable 202L. Here, with the above configuration, when a broadcast signal is transmitted from the antenna 200L to the broadcast receiving apparatus 100, as shown in FIG. 8C, frequency conversion amplification processing may be performed on the broadcast signal in the conversion section 201L. That is, when the antenna 200L is installed on the rooftop of an apartment building or the like and the broadcast signal is transmitted to the broadcast receiving apparatus 100 in each room by the coaxial cable 202L with a long cable length, the broadcast signal may be attenuated, and there is a possibility that the 4K broadcast wave in the lower floors cannot be correctly received particularly in the channel selection / detection section 131L.

[0233] Therefore, in order to prevent the above problems, the conversion section 201L performs frequency conversion amplification processing on the 4K broadcast signal in the lower floors. The frequency conversion amplification processing converts the frequency band of the 4K broadcast signal in the lower floors from the frequency band of 470 to 710 MHz (the band corresponding to channels 13 to 52 of UHF) to, for example, the frequency band of 770 to 1010 MHz exceeding the band corresponding to channel 62 of UHF. Further, processing is performed to amplify the 4K broadcast signal in the lower floors to a signal level at which the influence of attenuation in the cable is not a problem. By performing such processing, it is possible to avoid interference between the 2K broadcast signal and the 4K broadcast signal and also avoid the influence of attenuation of the broadcast signal during transmission through the coaxial cable. When the cable length of the coaxial cable 202L is short or the like and the influence of attenuation is not a problem, the conversion section 201L and the frequency conversion amplification processing may be unnecessary.

[0234] Also, the frequency band after conversion by frequency conversion amplification processing is preferably between 710 and 1032 MHz, which exceeds the band corresponding to channel 52 of UHF, or between 770 and 1032 MHz, which exceeds the band corresponding to channel 62 of UHF (in the case of retransmission by a cable TV station, etc.). The bandwidth of the region between the frequency band before conversion and the frequency band after conversion by frequency conversion amplification processing is preferably set to be an integer multiple of the bandwidth of one physical channel (6 MHz). The frequency conversion amplification processing may be performed only on the physical channels using signal transmission by the hierarchical division multiplexing method. Since all of these are the same as the description of the present embodiment related to frequency conversion already described, repeated description is omitted.

[0235] Note that the broadcast receiving apparatus 100 of the present embodiment can identify whether the received broadcast signal is a broadcast signal transmitted in the lower layer or a broadcast signal transmitted in the upper layer using the upper and lower layer identification bits of the TMCC information described in FIG. 5H. Also, the broadcast receiving apparatus 100 of the present embodiment can identify whether the received broadcast signal has been frequency-converted after antenna reception using the frequency conversion processing identification bits of the TMCC information described in FIG. 5F. Further, the broadcast receiving apparatus 100 of the present embodiment can identify whether the received broadcast signal is transmitting a 4K program in the lower layer using the 4K signal transmission layer identification bits of the TMCC information described in FIG. 5I. Although it is not impossible to perform these identification processes by demodulating the data carrier and referring to the control information included in the stream, demodulation of the data carrier is required and the process becomes complicated. Since it is simpler and faster to perform the identification by referring to the parameters of the above-described TMCC information, for example, the initial scan of the broadcast receiving apparatus 100 can be made faster.

[0236] Note that the channel selection / detection unit 131L of the third tuner / demodulation unit 130L of the broadcast receiving apparatus 100 according to the embodiment of the present invention has a reception function corresponding to the LDM (hierarchical division multiplexing) technology as already described. Therefore, the conversion unit 201L shown in FIG. 8C is not necessarily required between the antenna 200L and the broadcast receiving apparatus 100.

[0237] Note that the broadcast wave of terrestrial digital broadcasting transmitted by the hierarchical division multiplex transmission method described above can be received and played back by the third tuner / demodulator unit 130L of the broadcast receiving apparatus 100, but can also be received by the first tuner / demodulator unit 130C of the broadcast receiving apparatus 100. When the broadcast wave of the terrestrial digital broadcasting is received by the first tuner / demodulator unit 130C, among the broadcast signals of the broadcast wave of the terrestrial digital broadcasting, the broadcast signals transmitted in the layer of the advanced terrestrial digital broadcasting service are ignored, but the broadcast signals transmitted in the layer of the current terrestrial digital broadcasting service are played back.

[0238] [MPEG-2 TS method] The broadcast system of this embodiment is compatible with MPEG-2 TS adopted in current terrestrial digital broadcasting services and the like as a media transport method for transmitting data such as video and audio. Specifically, the format of the stream transmitted by the OFDM transmission wave in Fig. 4D(1) is MPEG-2 TS. Among the OFDM transmission waves in Fig. 4D(2) and Fig. 4D(3), the format of the stream transmitted in the layer where the current terrestrial digital broadcasting service is transmitted is MPEG-2 TS. Also, the format of the stream obtained by demodulating the transmission wave by the first tuner / demodulator unit 130C of the broadcast receiving apparatus 100 in Fig. 2 is MPEG-2 TS. Among the streams obtained by demodulating the transmission wave by the second tuner / demodulator unit 130T, the format of the stream corresponding to the layer where the current terrestrial digital broadcasting service is transmitted is MPEG-2 TS. Similarly, among the streams obtained by demodulating the transmission wave by the third tuner / demodulator unit 130L, the format of the stream corresponding to the layer where the current terrestrial digital broadcasting service is transmitted is MPEG-2 TS.

[0239] The MPEG-2 TS is characterized by multiplexing components such as video and audio that make up a program, together with control signals and a clock, into a single packet stream. Since it is treated as a single packet stream including the clock, it is suitable for transmitting one content over one transmission path with ensured transmission quality and is adopted in many current digital broadcast systems. Also, it is possible to realize two-way communication via a two-way network such as a fixed network / mobile network, and it is compatible with a broadcast communication cooperation system that combines functions using a broadband network with a digital broadcast service, such as acquiring additional content via the broadband network, performing arithmetic processing in a server device, and presenting processing in cooperation with a mobile terminal device, in combination with the digital broadcast service.

[0240] FIG. 9A shows an example of the protocol stack of a transmission signal in a broadcast system using MPEG-2 TS. In MPEG-2 TS, PSI, SI, and other control signals are transmitted in section format.

[0241] [Control Signals of a Broadcast System Using the MPEG-2 TS Method] As control information of the MPEG-2 TS method, there are mainly tables used for program arrangement information and tables used other than program arrangement information. The tables are transmitted in section format, and descriptors are arranged within the tables.

[0242] [Tables Used for Program Arrangement Information] FIG. 9B shows a list of tables used for program arrangement information in a broadcast system of the MPEG-2 TS method. In this embodiment, the following tables are used as tables for program arrangement information.

[0243] (1) PAT (Program Association Table) (2) CAT (Conditional Access Table) (3) PMT (Program Map Table) (4) NIT (Network Information Table) (5) SDT (Service Description Table) (6) BAT (Bouquet Association Table) (7) EIT (Event Information Table) (8) RST (Running Status Table) (9) TDT (Time and Date Table) (10) TOT (Time Offset Table)

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

[0245] <Tables used in digital broadcasting> Figure 9C shows a list of tables used other than the program arrangement information of the MPEG-2 TS system broadcast system. In this embodiment, the following tables are used as tables used other than the program arrangement information.

[0246] (1) ECM (Entitlement Control Message) (2) EMM (Entitlement Management Message) (3) DCT (Download Control Table) (4) DLT (DownLoad Table) (5) DIT (Discontinuity Information Table) (6) SIT (Selection Information Table) (7) SDTT (Software Download Trigger Table) (8) CDT (Common Data Table) (9) DSM-CC section (10) AIT (Application Information Table) (11) DCM (Download Control Message) (12) DMM (Download Management Message) (13) Tables set by the operator

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

[0248] (1) Conditional Access Descriptor (2) Copyright Descriptor (3) Network Name Descriptor (4) Service List Descriptor (5) Stuffing Descriptor (6) Satellite Delivery System Descriptor (7) Terrestrial Delivery System Descriptor (8) Bouquet Name Descriptor (9) Service Descriptor (10) Country Availability Descriptor

[0249] (11) Linkage Descriptor (12) NVOD Reference Descriptor (13) Time Shifted Service Descriptor (14) Short Event Descriptor (15) Extended Event Descriptor (16) Time Shifted Event Descriptor (17) Component Descriptor (18) Mosaic Descriptor (19) Stream Identifier Descriptor (20) CA Identifier Descriptor

[0250] (21) Content Descriptor (22) Parental Rating Descriptor (23) Hierarchical Transmission Descriptor (24) Digital Copy Control Descriptor (25) Emergency Information Descriptor (26) Data Component Descriptor (27) System Management Descriptor (28) Local Time Offset Descriptor (29) Audio Component Descriptor (30) Target Region Descriptor

[0251] (31) Hyperlink Descriptor (32) Data Content Descriptor (33) Video Decode Control Descriptor (34) Basic Local Event Descriptor (35) Reference Descriptor (36) Node Relation Descriptor (37) Short Node Information Descriptor (38) STC Reference Descriptor (39) Partial Reception Descriptor (40) Series Descriptor

[0252] (41) Event Group Descriptor (42) SI Transmission Parameter Descriptor (43) Broadcaster Name Descriptor (44) Component Group Descriptor (45) SI Prime TS Descriptor (46) Board Information Descriptor (47) LDT Linkage Descriptor (48) Connected Transmission Descriptor (49) TS Information Descriptor (50) Extended Broadcaster Descriptor

[0253] (51) Logo Transmission Descriptor (52) Content Availability Descriptor (53) Carousel Compatible Composite Descriptor (54) Conditional Playback Descriptor (55) AVC Video Descriptor (56) AVC Timing and HRD Descriptor (57) Service Group Descriptor (58) MPEG-4 Audio Descriptor (59) MPEG-4 Audio Extension Descriptor (60) Registration Descriptor

[0254] (61) Data Broadcast Id Descriptor (62) Access Control Descriptor (63) Area Broadcasting Information Descriptor (64) Material Information Descriptor (65) HEVC Video Descriptor (66) Hierarchy Descriptor (67) Hybrid Information Descriptor (68) Scrambler Descriptor (69) Descriptor Set by Operator

[0255] <Descriptor Used in Digital Broadcasting> Figure 9G shows a list of descriptors used other than the program arrangement information of the MPEG-2 TS system broadcast system. In this embodiment, the following are used as descriptors used other than the program arrangement 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 an 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 broadcast system. In this embodiment, the following descriptors are used as descriptors 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 Playback Application Location Descriptor (Simple Playback Application Location Descriptor) (11) Application Expiration Descriptor (12) Descriptor Set by the Operator

[0261] [MMT System] The broadcast system of this embodiment can also support the MMT system as a media transport system for transmitting data such as video and audio. Specifically, among the OFDM transmission waves in FIGS. 4D(2) and 4D(3), the stream system transmitted in the layer where advanced terrestrial digital broadcast services are transmitted is generally the MMT system. Also, among the streams obtained by demodulating the transmission wave by the second tuner / demodulation unit 130T of the broadcast receiver 100 in FIG. 2, the stream system corresponding to the layer where advanced terrestrial digital broadcast services are transmitted is generally MMT. Similarly, among the streams obtained by demodulating the transmission wave by the third tuner / demodulation unit 130L, the stream system corresponding to the layer where advanced terrestrial digital broadcast services are transmitted is generally MMT. As a modification, an MPEG-2 TS stream may be used for advanced terrestrial digital broadcast services. Also, the stream system obtained by demodulating the transmission wave by the fourth tuner / demodulation unit 130B is MMT.

[0262] The MMT method is a newly formulated media transport method because the functions of the MPEG-2 TS method have limitations in the face of environmental changes related to content distribution in recent years, such as the diversification of content, the diversification of devices for using content, the diversification of transmission paths for distributing content, the diversification of content storage environments, etc.

[0263] The codes of the video signal and audio signal of a broadcast program are MFU (Media Fragment Unit) / MPU (Media Processing Unit), which are carried on the MMTP (MMT Protocol) payload, packetized into MMTP packets, and transmitted by IP packets. Also, for data content and subtitle signals related to the broadcast program, they are in the form of MFU / MPU, carried on the MMTP payload, packetized into MMTP packets, and transmitted by IP packets.

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

[0265] Figure 10A shows the protocol stack of MMT in the broadcast transmission path. Also, Figure 10B shows the protocol stack of MMT in the communication line. In the MMT method, a mechanism for transmitting two types of control information, MMT-SI and TLV-SI, is prepared. MMT-SI is control information indicating the composition of a broadcast program, etc. It is in the form of an MMT control message, carried on the MMTP payload, packetized into MMTP packets, and transmitted by IP packets. TLV-SI is control information related to the multiplexing of IP packets, and provides information for channel selection and the correspondence information between IP addresses and services.

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

[0267] [Tables Used in TLV-SI] Fig. 10C shows a list of tables used in the TLV-SI of the MMT-based broadcasting system. In this embodiment, the following tables are used as the 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 the TLV-SI of the MMT-based broadcasting system. In this embodiment, the following descriptors are used as the 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] <Messages 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) Messages set by the operator

[0273] <Tables used in MMT - SI> 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) MH-Application Boundary and Permission 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-Playback Application Descriptor (MH-Playback Application Descriptor) (66) MH-Simple Playback Application Location Descriptor (MH-Simple Playback Application Location Descriptor) (67) MH-Application Expiration Descriptor (MH-Application Expiration Descriptor) (68) Related Broadcaster Descriptor (69) Multimedia Service Descriptor (70) Descriptor Set by Operator

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

[0285] In the MMT 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-SIs 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 the MPT (MMT Package Table) stored in the 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 the MPT (2) Data multiplexed in the IPv4 data flow (3) Data multiplexed in the IPv6 data flow (4) Data multiplexed in the broadcast MPEG2-TS (5) Data multiplexed in the MPEG2-TS format within the IP data flow (6) Data at the specified URL It is possible to specify various types of data transmitted through various transmission paths, such as the above.

[0287] In the MMT-based broadcast system, there is further a concept of an event. An event is a so-called program concept handled by the MH-EIT included and sent in the M2 section message. Specifically, in the package indicated by the event package descriptor stored in the MH-EIT, a series of data included in the period of the duration from the disclosure time stored in the MH-EIT is the data included in the concept of the event. The MH-EIT can be used in the broadcast receiver 100 for various processes in units of the event (for example, program guide generation process, control of recording reservation and viewing reservation, copyright management processes such as temporary storage, etc.).

[0288] [Channel Setting Process of Broadcast Receiver] <Initial Scan> In the current terrestrial digital broadcasting, the network ID is different for each transmission master unit, and it is common that information about other stations is not described in the NIT. Therefore, the broadcast receiving apparatus 100 according to an embodiment of the present invention, which has compatibility with the current terrestrial digital broadcasting, for the terrestrial digital broadcasting according to an embodiment of the present invention (advanced terrestrial digital broadcasting, or terrestrial digital broadcasting in which advanced terrestrial digital broadcasting and the current terrestrial digital broadcasting are simultaneously transmitted in separate layers), needs to have a function of searching (scanning) all receivable channels at the receiving point and creating a service list (receivable frequency table) based on the service ID. Note that in an area where the same network ID can be received on different physical channels by an MFN (Multi Frequency Network), it is basically sufficient to operate so as to select a channel with good received C / N or BER (Bit Error Rate) and store it in the service list.

[0289] Note that for the advanced BS digital broadcasting or the advanced CS digital broadcasting received by the fourth tuner / demodulation unit 130B of the broadcast receiving apparatus 100 according to an embodiment of the present invention, the broadcast receiving apparatus 100 may acquire and store the service list stored in the TLV-NIT, and there is no need to create the service list. Therefore, for the advanced BS digital broadcasting or the advanced CS digital broadcasting received by the fourth tuner / demodulation unit 130B, the initial scan and the rescan described later are unnecessary.

[0290] <Rescan> The broadcast receiving apparatus 100 according to an embodiment of the present invention has a rescan function for cases such as a new station opening, a new relay station installation, or a change in the receiving point of a television receiver. When changing the preset information, the broadcast receiving apparatus 100 can notify the user to that effect.

[0291] <Operation example during initial / rescan> FIG. 11A shows an example of an operation sequence of channel setting processing (initial / re-scanning) of the broadcast receiving apparatus 100 according to an embodiment of the present invention. Note that in the figure, an example in the case of adopting MPEG-2 TS as the media transport method is shown, but the same processing basically applies also in the case of adopting the MMT method.

[0292] In the channel setting process, first, the receiver function control unit 1102 performs setting of the residential area (selection of the area where the broadcast receiving apparatus 100 is installed) based on a user's instruction (S101). At this time, instead of the user's instruction, the setting of the residential area may be automatically performed based on the installation position information of the broadcast receiving apparatus 100 obtained by a predetermined process. As an example of the acquisition process of the installation position information, information may be acquired from a network to which the LAN communication unit 121 is connected, or information regarding the installation position 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 the tuner / demodulation unit (when not distinguishing the first tuner / demodulation unit 130C, the second tuner / demodulation unit 130T, and the third tuner / demodulation unit 130L, it is described like this. The same applies hereinafter.) is instructed to perform tuning to the set frequency (S102).

[0293] The tuner / demodulation unit executes tuning based on the instruction (S103), and when successful in locking to the set frequency (S103: Yes), the process proceeds to the process of S104. When not successful in locking (S103: No), the process proceeds to the process of S111. In the process of S104, C / N is confirmed (S104), and when a C / N equal to or higher than a predetermined value is obtained (S104: Yes), the process proceeds to the process of S105 to perform reception confirmation processing. When a C / N equal to or higher than a predetermined value is not obtained (S104: No), the process proceeds to the process 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, by acquiring and collating the NIT, it is confirmed whether the NIT is valid data (S106). If the NIT acquired in the process of S106 is valid data, the reception function control unit 1102 acquires information such as the transport stream ID and the original network ID from the NIT. Also, distribution system information regarding the physical conditions of the broadcast transmission path corresponding to each transport stream ID / original network ID is acquired from the terrestrial distribution system descriptor. Also, a list of service IDs is acquired from the service list descriptor.

[0295] Next, the reception function control unit 1102 checks the service list stored in the receiving apparatus to confirm whether the transport stream ID acquired in the process of S106 has already been acquired (S107). If the transport stream ID acquired in the process of S106 has not been acquired yet (S107: No), 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 at the time of acquiring the transport stream ID already described in the service list (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] Also, in the above-described service list creation (addition / update) process, the remote control key ID may be acquired from the TS information descriptor, and the association between the representative service for each transport stream and the remote control key may be performed. By this process, one-touch channel selection described later becomes possible.

[0297] After completing the reception confirmation process, the receiver 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 / demodulation unit is incremented (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 the result of the channel setting process (S113). Also, if there are duplicates of remote control keys or the like, the user may be notified to that effect, and the user may be prompted to change the remote control key settings or the like (S114). The service list created / updated in the above process is stored in a non-volatile memory such as the ROM 103 or the storage (accumulation) unit 110 of the broadcast receiving apparatus 100.

[0299] FIG. 11B shows an example of the data structure of the NIT. In the figure, 'transpotrt_stream_id' corresponds to the above-mentioned transport stream ID, and 'original_network_id' corresponds to the original network ID. Also, FIG. 11C shows an example of the data structure of the terrestrial distribution system descriptor. In the figure, 'guard_interval', 'transmission_mode', 'frequency', etc. correspond to the above-mentioned distribution system information. FIG. 11D shows an example of the data structure of the service list descriptor. In the figure,'service_id' corresponds to the above-mentioned service ID. FIG. 11E shows an example of the data structure of the TS information descriptor. In the figure,'remote_control_key_id' corresponds to the above-mentioned remote control key ID.

[0300] Note that in the broadcast receiving apparatus 100, the above-described frequency range to be scanned may be appropriately changed under control according to the broadcast service to be received. For example, when the broadcast receiving apparatus 100 is receiving a broadcast wave of the current terrestrial digital broadcast service, it is controlled to scan a frequency range of 470 to 770 MHz (corresponding to channels 13 to 62 of the physical channel). 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 in the process of S112, control is performed to perform a frequency value up of +6 MHz.

[0301] Also, when the broadcast receiving apparatus 100 is receiving a broadcast wave including the advanced terrestrial digital broadcast service, it 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 and the frequency conversion amplification process shown in FIG. 8C are being 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 in the process of S112, control is performed to perform a frequency value up of +6 MHz. Note that even when the broadcast receiving apparatus 100 is receiving the advanced terrestrial digital broadcast service, if it is determined that the above-described frequency conversion process and frequency conversion amplification process are not being performed, control may be performed to scan only the frequency range of 470 to 770 MHz. The selection control of the frequency range to be scanned can be performed by the broadcast receiving apparatus 100 based on system identification of TMCC information, frequency conversion process identification, and the like.

[0302] In addition, when the broadcast system according to an embodiment of the present invention has the configuration shown in FIG. 7C, for example, and the broadcast receiving apparatus 100 is receiving an advanced terrestrial digital broadcast service using a polarization multiplexing transmission system, one of the channel selection / detection unit 131H and the channel selection / 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 frequency conversion processing is performed on the transmission wave with the polarization detected by the other channel selection / detection unit). By controlling in this way based on the system identification and frequency conversion processing identification of the TMCC information, it becomes possible to omit scanning in an unnecessary frequency range, and it becomes possible to reduce the time required for channel setting. Further, in this case, the operation sequences of FIG. 11A may be advanced in parallel by both the channel selection / detection unit 131H and the channel selection / detection unit 131V, and the loops of the frequency up S112 in the operation sequence of FIG. 11A may be synchronized. At this time, for a pair of a horizontal polarization signal and a vertical polarization signal transmitted on the same physical channel in the loop of the frequency up in the operation sequence of FIG. 11A, if they are configured to be received in parallel respectively, control information and the like inside the packet stream of the advanced terrestrial digital service transmitted by the pair of the horizontal polarization signal and the vertical polarization signal can be decoded and acquired during the loop process. Thereby, since scanning and service list creation proceed efficiently, it is suitable.

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

[0304] As described with reference to FIGS. 8A, 8B, and 8C, the terrestrial digital broadcast service transmitted in either the upper layer or the lower layer in the configuration shown in FIG. 8B is the current terrestrial digital broadcast service. Therefore, for example, among the frequency ranges of 470 to 770 MHz and 770 to 1010 MHz, the first tuner / demodulator 130C may scan the frequency range in which the current terrestrial digital broadcast service is transmitted, and the third tuner / demodulator 130L may scan the other frequency range in parallel. Also in this case, similar to the parallel scan by the double tuner of the third tuner / demodulator 130L described above, it is possible to reduce the time required for channel setting. Whether the current terrestrial digital broadcast service or the advanced terrestrial digital broadcast service is transmitted in either the frequency range of 470 to 770 MHz or the frequency range of 770 to 1010 MHz can be identified by receiving at two points, one point at a time for each frequency range, for a total of two points, for example, 470 to 476 MHz (center frequency 473 MHz) and 770 to 776 MHz (center frequency 773 MHz), with the third tuner / demodulator 130L before starting the operation sequence of the initial scan / re-scan, and obtaining the TMCC information transmitted at each frequency and referring to the parameters (for example, system identification parameters) stored in the TMCC information.

[0305] In the case of a high-definition terrestrial digital broadcast service using a polarization-duplex transmission system, for example, in the case of a channel having a broadcast program that uses both a horizontal polarization signal and a vertical polarization signal, such as the 4K broadcast program in the hierarchical division example (1) of FIG. 7A, the same transport ID is detected in scans of both the frequency range of 470 to 770 MHz and the frequency range of 770 to 1010 MHz, and this is described in the service list as one channel. Also, in the case of the 2K broadcast program in the B layer shown in the figure, when the same broadcast program is transmitted in the B layer of the horizontal polarization signal and the B layer of the vertical polarization signal, the same transport ID may be detected and stored in the service list as one channel. That is, when the same broadcast program is transmitted in the same layer transmitted with different polarizations, it is recognized as merged into one channel and not recognized as separate channels. By doing so, in the channel selection process using the service list, it is possible to avoid confusion of the user due to the existence of exactly the same broadcast program on different channels.

[0306] On the other hand, in the case of a high-definition terrestrial digital broadcast service using a polarization-duplex transmission system, when different broadcast programs are transmitted in the B layer of the horizontal polarization signal and the B layer of the vertical polarization signal (when the B layer of the vertical polarization signal is treated as a virtual D layer), they are stored in the service list as different channels. Whether the same broadcast program is transmitted in the B layer of the horizontal polarization signal and the B layer of the vertical polarization signal can be identified by referring to additional layer transmission identification parameters of TMCC information or the like in the broadcast receiving apparatus 100.

[0307] [Channel Selection Process of Broadcast Receiving Apparatus] The broadcast receiver 100 according to an embodiment of the present invention has functions as a program channel selection, such as one-touch channel selection using a one-touch key on a remote control, channel up / down selection using channel up / down keys on the remote control, and direct selection by directly inputting a three-digit number using the numeric keypad on the remote control. Any of these channel selection functions may be performed using the information stored in the service list generated by the initial scan / rescan described above. Also, after channel selection, information on the selected channel (the three-digit number used for direct selection, sub-channel number, TS name, service name, logo, video resolution information (such as the 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 banner display or the like. In this way, the user can visually obtain information on the channel after channel selection and confirm whether the desired channel has been selected. Hereinafter, an example of the processing in each channel selection method will be described.

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

[0309] <Example of up / down channel selection processing using channel up / down buttons> (1) By pressing the channel up / down keys on the remote control, perform channel selection in ascending order of the three-digit number used for direct selection. (1-1) When the up key is pressed, select the service adjacent to the upper side of the three-digit number. However, when the current value of the three-digit number is the maximum value in the service list, select the service with the minimum number. (1-2) When the down key is pressed, select the service adjacent to the lower side of the three-digit number. However, when the current value of the three-digit number is the minimum value in the service list, select the service with the maximum number. (2) Set the last mode and perform channel information display after channel selection.

[0310] <Example of Direct Channel Selection Processing> (1) When direct channel selection is selected, it enters a state waiting for the input of a three - digit number. (2 - 1) If the input of the three - digit number is not completed within a predetermined time (about 5 seconds), it returns to the normal mode and displays the channel information of the currently selected service. (2 - 2) When the input of the three - digit number is completed, it determines whether the channel exists in the service list of the receivable frequency table. If not, it displays a message such as "This channel does not exist". (3) When the channel exists, it performs the channel selection process, sets the last mode, and displays the channel information after channel selection.

[0311] Note that the channel selection operation is based on SI. When it is determined that the broadcast is suspended, it may also have a function to display that fact and notify the user.

[0312] <Remote Controller of Broadcast Receiver> FIG. 12A shows an example of the external view of a remote controller (remote control) used for inputting operation instructions to the broadcast receiver 100 according to an embodiment of the present invention.

[0313] The remote controller 180R includes a power key 180R1 for turning on / off the power (standby on / off) of the broadcast receiver 100, cursor keys (up, down, left, right) 180R2 for moving the cursor up, down, left, and right, a decision key 180R3 for determining the item at the cursor position as a selected item, and a return key 180R4.

[0314] In addition, the remote controller 180R is provided with a network switching key (High-VHF digital, VHF digital, High-BS, BS, CS) 180R5 for switching the broadcast network received by the broadcast receiving apparatus 100. The remote controller 180R is also provided with one-touch keys (1 to 12) 180R6 for one-touch channel selection, a channel up / down key 180R7 for channel up / down selection, and a numeric keypad used for inputting a three-digit number during direct channel selection. In the example shown in the figure, the numeric keypad is shared with the one-touch keys 180R6, and during direct channel selection, a three-digit number can be input by operating the one-touch keys 180R6 after pressing the direct key 180R8.

[0315] In addition, the remote controller 180R is provided with an EPG key 180R9 for displaying the program guide and a menu key 180RA for displaying the system menu. The program guide and the system menu can be operated in detail using the cursor key 180R2, the enter key 180R3, and the return key 180R4.

[0316] The remote controller 180R is also provided with a d key 180RB used for data broadcast services, multimedia services, etc., a cooperation key 180RC for displaying a list of broadcast communication cooperation services and their corresponding applications, etc., and color keys (blue, red, green, yellow) 180RD. In data broadcast services, multimedia services, broadcast communication cooperation services, etc., detailed operations can be performed using the cursor key 180R2, the enter key 180R3, the return key 180R4, and the color keys 180RD.

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

[0318] <Example of Network Switching Process by Highly Digital Keys> The remote control 180R of the broadcast receiving apparatus 100 according to an embodiment of the present invention includes, as network switching keys 180R5, a "Highly Digital Key", a "Digital Key", a "Highly BS Key", a "BS Key", and a "CS Key". Here, in the highly digital terrestrial broadcast service, for example, when simulcast of 4K broadcast programs and 2K broadcast programs is performed in different layers, when the "Highly Digital Key" is pressed, selection of 4K broadcast programs is prioritized when selecting a channel, and when the "Digital Key" is pressed, selection of 2K broadcast programs may be 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 reception of a 4K broadcast program is possible, by pressing the "Digital Key", control such as forcibly selecting a 2K broadcast program becomes possible.

[0319] <Example of Screen Display at Channel Selection> As described above, when the broadcast receiving apparatus 100 according to an embodiment of the present invention executes channel selection by one-touch channel selection, channel up / down selection, direct channel selection, etc., it has a function of displaying information on the selected channel by means of a banner display or the like.

[0320] FIG. 12B shows an example of a banner display at channel selection. The banner display 192A1 is an example of a banner display displayed when a 2K broadcast program is selected. For example, the program name, the start time / end time of the program, the network type, the number of the direct channel selection key of the remote control, the service logo, and a three-digit number may be displayed. The banner display 192A2 is an example of a banner display displayed when a 4K broadcast program is selected. For example, in addition to each piece of information similar to the above-mentioned banner display 192A1, a mark symbolizing "High Definition" indicating that the received program is a 4K broadcast program is further displayed. Also, when resolution conversion processing, downmixing processing, etc. are performed, a display indicating that fact may be made. In the example of the banner display 192A2, as an example, it is displayed that down-conversion processing from UHD resolution to HD resolution and downmixing processing from 22.2ch to 5.1ch have been performed.

[0321] In the broadcast receiving apparatus 100, by performing these displays, when the same content is simultaneously broadcast as broadcast programs of different qualities such as a 2K broadcast program and a 4K broadcast program by simulcast or the like, the user can suitably grasp which broadcast program is being displayed.

[0322] According to the system of the advanced digital broadcast 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 technology and a reception technology for a higher-functional advanced digital broadcast service in consideration of compatibility with the current digital broadcast service. That is, it is possible to provide a technology for more suitably transmitting or receiving the advanced digital broadcast service.

[0323] (Embodiment 2) Embodiment 2 of the present invention will be described. Embodiment 2 of the present invention is configured to be able to change the injection level in the digital broadcast system according to Embodiment 1. Hereinafter, the differences from Embodiment 1 will be described. Other configurations, processes, and operations other than those described below are the same as those in Embodiment 1, and thus the description thereof will be omitted.

[0324] In Example 1, as an example of a transmission method for realizing 4K broadcast while maintaining the viewing environment of the current terrestrial digital broadcast service, the hierarchical division multiplex transmission method shown in FIG. 8A was described. As described above, the difference between the modulation wave levels of the upper layer and the lower layer (the difference in transmission power) is called the injection level (IL: Injection Level), which is a value defined on the broadcast station side. As described above, the injection level generally indicates the difference in modulation wave levels (power difference) as a relative ratio (dB) in logarithmic expression. The reception range of the lower layer modulation wave varies according to the modulation wave level of the upper layer modulation wave and the injection level, and it is known that reducing the injection level expands the reception range of the lower layer modulation wave. Details of the relationship between the injection level and the modulation wave level will be described later. Note that the change in the injection level can also be expressed as a change in the transmission power difference between the upper layer modulation wave and the lower layer modulation wave.

[0325] FIG. 13 shows an example of the reception range of an advanced terrestrial digital broadcast service using the hierarchical division multiplex transmission method according to this embodiment. In FIG. 13(1), a transmission wave of the hierarchical division multiplex method is transmitted from a radio tower 30300, and broadcast receiving apparatuses 30101, 30102, 30103, and 30104 having the same configuration as the broadcast receiving apparatus 100 are installed. Inside the upper layer reception range 30910, an upper layer modulated wave can be received and a broadcast program can be displayed. Similarly, inside the lower layer reception range 30900, a lower layer modulated wave can be received and a broadcast program can be displayed. Since the inside of the lower layer reception range 30900 is included in the upper layer reception range 30910, the upper layer modulated wave can also be received and a broadcast program can be displayed. When a 2K broadcast program is transmitted in the upper layer and a 4K broadcast program is transmitted in the lower layer, the broadcast receiving apparatus 30101 can receive the lower layer modulated wave and display the 4K broadcast program. Also, the broadcast receiving apparatus 30101 can receive the upper layer modulated wave and display the 2K broadcast program. However, the broadcast receiving apparatuses 30102 and 30103 can only receive the upper layer modulated wave and cannot correctly receive the lower layer modulated wave. Therefore, only the 2K broadcast program can be displayed and the 4K broadcast program cannot be displayed. Also, the broadcast receiving apparatus 30104 is outside the reception range of both the upper layer and the lower layer, and the 2K broadcast program in the upper layer cannot be received, nor can the 4K broadcast program in the lower layer be received.

[0326] FIG. 13(2) shows an example of the reception range when the injection level is slightly changed. When the injection level is decreased, the lower layer reception range 30900 expands to the changed lower layer reception range 30901. Therefore, the broadcast receiving apparatus 30102 can newly receive the 4K broadcast program transmitted by the lower layer modulated wave. On the other hand, the reception states of the receiving apparatuses 30101, 30103, and 30104 do not change. At this time, in order for the broadcast receiving apparatus 30102 to display the 4K broadcast program, it is necessary to perform a rescan, which is a setting process of the reception setting, to newly acquire control information regarding the reception of the 4K broadcast program and store it in the memory of the receiving apparatus or the like.

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

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

[0329] FIG. 14(3) shows an example of a modulated wave received by the broadcast receiving apparatus 30101. The position of the broadcast receiving apparatus 30101 is at a position far from the radio tower 30300. Therefore, the modulated wave transmitted from the radio tower 30300 is attenuated and becomes the upper-layer modulated wave 30310 and the lower-layer modulated wave 30320. The injection level 30112, the required C / N 30111 of the upper-layer modulated wave, and the required C / N 30121 of the lower-layer modulated wave are the same as those in FIG. 14(1). Due to the attenuation, the modulation wave level of the lower-layer modulated wave 30320 is lower than the modulation wave level of the lower-layer modulated wave 30120 in FIG. 14(1). Similarly, the lower-layer modulated wave C / N 30322 becomes smaller than the lower-layer modulated wave C / N 30122 in FIG. 14(2). However, since the injection level 30112 is larger than the required C / N 30111 of the upper-layer modulated wave, the broadcast receiving apparatus 30101 can receive and display a 2K broadcast program transmitted by the upper-layer modulated wave 30310. Also, although the lower-layer modulated wave C / N 30322 is attenuated, it is still larger than the required C / N 30121 of the lower-layer modulated wave, so the broadcast receiving apparatus 30101 can receive and display a 4K broadcast program transmitted by the lower-layer modulated wave 30320.

[0330] FIG. 14(5) shows an example of a modulated wave received by the broadcast receiving apparatus 30102. The position of the broadcast receiving apparatus 30102 is further away from the radio tower 30300 than the position of the broadcast receiving apparatus 30101. Therefore, the modulated wave transmitted from the radio tower 30300 is attenuated and becomes the upper layer modulated wave 30510 and the lower layer modulated wave 30520. The injection level 30112, the required C / N 30111 for the upper layer modulated wave, and the required C / N 30121 for the lower layer modulated wave are the same as those in FIG. 14(1). Due to the attenuation, the modulated wave level of the lower layer modulation 30520 is lower than the modulated wave level of the lower layer modulated wave 30320 in FIG. 14(3). Similarly, the C / N 30522 of the lower layer modulated wave becomes even smaller than the C / N 30322 of the lower layer modulated wave. Here, since the injection level 30112 is larger than the required C / N 30111 for the upper layer modulated wave, the broadcast receiving apparatus 30102 can receive and display a 2K broadcast program transmitted by the upper layer modulated wave 30310. However, as a result of the above attenuation of the modulated wave level of the lower layer modulation 30520, the C / N 30522 of the lower layer modulated wave becomes smaller than the required C / N 30121 for the lower layer modulated wave. Therefore, the broadcast receiving apparatus 30102 cannot receive and display a 4K broadcast program transmitted by the lower layer modulated wave 30520.

[0331] Next, FIG. 14(2) shows an example of a modulated wave transmitted from the radio tower 30300 when the injection level is changed on the broadcast station side. When changing the injection level shown in FIG. 14, the modulated wave level of the upper layer modulated wave 30210 is the same as that of the upper layer modulated wave 30110 in FIG. 14(1) before the change of the injection level, but the modulation parameter of the modulated wave is changed so that the required C / N 30211 for the upper layer modulated wave becomes smaller than the required C / N 30111 for the upper layer modulated wave in FIG. 14(1) before the change of the injection level. Also, the C / N 30222 of the lower layer modulated wave is set to be larger than the C / N 30122 of the lower layer modulated wave. Further, the injection level 30212 is set to be smaller than the injection level 30112.

[0332] Fig. 14(4) shows an example of the modulated wave received by the broadcast receiver 30101 when the modulated wave of Fig. 14(2) is transmitted. The position of the broadcast receiver 30101 is at a position far from the radio tower 30300. Therefore, the modulated wave transmitted from the radio tower 30300 is attenuated and becomes the upper layer modulated wave 30410 and the lower layer modulated wave 30420. Here, since the injection level 30212 is larger than the required C / N 30211 of the upper layer modulated wave, the broadcast receiver 30101 can receive and display the 2K broadcast program transmitted by the upper layer modulated wave 30410. Also, although the C / N 30422 of the lower layer modulated wave is attenuated, it is still larger than the required C / N 30221 of the lower layer modulated wave. Therefore, the broadcast receiver 30101 can receive and display the 4K broadcast program transmitted by the lower layer modulated wave 30420.

[0333] FIG. 14(6) shows an example of the modulated wave received by the broadcast receiving apparatus 30102 when the modulated wave of FIG. 14(2) is transmitted. The position of the broadcast receiving apparatus 30102 is farther from the radio tower 30300 than the position of the broadcast receiving apparatus 30101. Therefore, the modulated wave transmitted from the radio tower 30300 is attenuated and becomes the upper layer modulated wave 30610 and the lower layer modulated wave 30620. Here, since the injection level 30212 is larger than the required C / N 30211 of the upper layer modulated wave, the broadcast receiving apparatus 30102 can receive and display the 2K broadcast program transmitted by the upper layer modulated wave 30610. Also, the C / N 30622 of the lower layer modulated wave becomes even smaller than the C / N 30422 of the lower layer modulated wave in FIG. 14(4). However, in the example of FIG. 14(6), unlike FIG. 14(5) before the injection level change, the C / N 30222 of the lower layer modulated wave of the modulated wave transmitted from the radio tower 30300 is higher than the C / N 30122 of the lower layer modulated wave before the injection level change. For this reason, the C / N 30622 of the lower layer modulated wave remains larger than the required C / N 30221 of the lower layer modulated wave. That is, the broadcast receiving apparatus 30102 has shifted from a state where it could not receive and display the 4K broadcast program transmitted by the lower layer modulated wave 30520 to a state where it can receive and display the 4K broadcast program transmitted by the lower layer modulated wave 30620 due to the above-described injection level change. Therefore, the broadcast receiving apparatus 30102 can newly display the 4K broadcast program by performing a rescan.

[0334] As described above with reference to FIGS. 13 and 14, by changing the injection level, it is possible to expand the installation range of the receiving apparatus that can receive the broadcast program transmitted by the lower layer modulated wave. Also, considering the receiving apparatus installed at a predetermined position, by changing the injection level, it is possible to transition from a state where the broadcast program transmitted by the lower layer modulated wave could not be received and displayed to a state where the broadcast program transmitted by the lower layer modulated wave can be received and displayed.

[0335] <Transmission of Injection Level Identification> Next, a technique for more suitably performing the transition of the reception state of a broadcast program in the receiving apparatus due to the above injection level change will be described. First, the transmission of injection level identification will be described.

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

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

[0338] Next, FIGS. 16A and 16B show examples of bit assignments for injection level state identification. Both FIGS. 16A and 16B identify which state among a plurality of different states the injection level state is in. However, in the example of FIG. 16A and the example of FIG. 16B, examples in which each state of the injection level is defined differently from each other are shown.

[0339] First, the example of FIG. 16A will be described. When this parameter is '000', hierarchical division multiplex transmission is not applied. When this parameter is any one of '001' to '111', hierarchical division multiplex transmission is applied, and it shows which state among the first state to the seventh state the injection level state is in. The unit of the injection level itself is represented in dB. In the example of FIG. 16A, the injection level identification bit is set and transmitted according to which range in the range shown in the figure the injection level of the target transmission wave is included in. The broadcast receiving apparatus can acquire the injection level state identification bit of FIG. 16A and grasp in which range the injection level of the target transmission wave is based on this.

[0340] Next, the example of FIG. 16B will be described. When this parameter is '000', hierarchical division multiplex transmission is not applied. When this parameter is any one of '001' to '111', hierarchical division multiplex transmission is applied, and it indicates which state among the first state to the seventh state the injection level state is in. Here, in the example of FIG. 16B, different from the example of FIG. 16A, the injection levels indicated by the first state to the seventh state are not in the range indicated in dB but each indicate a predetermined dB level. In this case, although the injection level of the transmission wave that can be set by the broadcasting station side is limited to these multiple options, the accuracy of the value of the injection level indicated by the identification bit in FIG. 16B is increased. The broadcast receiving apparatus can acquire the injection level state identification bit and, based on this, grasp what value the injection level of the target transmission wave is.

[0341] Note that in both the example of FIG. 16A and the example of FIG. 16B, the meanings of the first state to the seventh state of the injection level state do not necessarily mean that the first state transitions one state at a time. For example, when starting a digital broadcast service of a 4K broadcast program by a lower layer modulated wave, it is not necessarily required to start from the first state of the injection level state. For example, it may start from the second state. Also, the change of the injection level state may be changed one state at a time, but it may also be changed from the first state to the third state, the fifth state, etc. These may be set according to the policy of the broadcasting station side. However, changes such as changing from the fifth state to the fourth state, which increase the injection level, should be avoided. This is because it is a change that narrows the reception range of the 4K broadcast program transmitted by the lower layer modulated wave, which may cause disadvantages to the user. That is, the first state to the seventh state, which are the injection level states shown in the examples of FIG. 16A and FIG. 16B, can be said to be states that irreversibly transition in the digital broadcast system.

[0342] In the examples of FIGS. 16A and 16B, considering the bit efficiency, the injection level was expressed with a resolution of about 7 states. On the other hand, as another modification example of the identification bits for the injection level states, the number of bits of the identification bits may be increased to express the injection level as a value in dB units indicating the direct modulation wave level difference. In this case, the number of options for the injection level of the transmission wave that can be set by the broadcasting station side can be increased, and the accuracy of the value of the injection level that can be grasped by the broadcast receiving apparatus side is increased.

[0343] Further, as still another modification example of the identification bits for the injection level states, a method of calculating the modulation wave level difference using a prescribed calculation formula with the value of the transmitted bit as a variable may be used.

[0344] Also, the identification bits for the injection level states may be included in the TMCC information and transmitted.

[0345] By using the identification bits for the injection level states described above, the change in the injection level can be suitably transmitted from the broadcasting station side to the broadcast receiving apparatus side.

[0346] <Rescan> The broadcast receiving apparatus 100 according to the second embodiment of the present invention has a new rescan function in order to suitably respond to the change in the injection level. This will be described below.

[0347] In the following description, all points described as "injection level" may be read as "injection level state". The reason is as follows. As already described in the explanation of the identification bit of the injection level state in FIG. 16, in the broadcast receiving apparatus 100, there are cases where the value of the injection level can be directly identified, and cases where state identification is possible with a certain value range. In the latter case, even if the injection level is changed, as long as it is within a certain range, the state of the injection level is determined to be "unchanged". Therefore, in the broadcast receiving apparatus 100, when the value of the injection level can be directly identified, in the following description, "change of injection level" may be considered as the same expression. Also, in the broadcast receiving apparatus 100, when the change of the injection level is to identify the change in units of "state" with a certain range, in the following description, "injection level" shall be read as "injection level state".

[0348] FIG. 17 shows an example of the operation sequence of the rescan of the broadcast receiving apparatus 100 according to Embodiment 2 of the present invention. Note that in the figure, an example in the case of adopting MPEG-2 TS as the media transport method is shown, but basically the same processing is performed in the case of adopting the MMT method.

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

[0350] The broadcast receiving device 100 acquires AC information in the tuner / demodulation unit (S30001). Next, it compares the injection level stored in the non-volatile memory of the ROM 103 or the various information storage area 1019 (the injection level stored at the time of the initial scan or the latest rescan) with the injection level included in the acquired AC information, detects whether there is a change, and determines the necessity of a rescan (S30002). If the injection levels are the same, since there is no change in the injection level, the process ends. If it is detected that the injection level has been changed to a lower level, it means that the reception range of the lower layer has expanded. In this case, since there is a possibility of transitioning to a state where a broadcast program transmitted by a lower layer modulated wave can be received, it is determined that a rescan is necessary, and the process proceeds to the process of S30003.

[0351] In the process of S30003, it is confirmed whether a service list for 4K broadcast already exists on the received channel. If it exists, it indicates that the broadcast receiving device 100 has been able to receive the lower layer modulated wave since before the expansion of the lower layer reception range, and since a rescan is unnecessary, the process ends. If the 4K broadcast service list does not exist, since there is a possibility that the broadcast receiving device 100 is newly included in the lower layer reception range, the process proceeds to the process of S30004. Note that the order of the processes of S30002 and S30003 may be interchanged. Note that the branch determination process by the process of S30003 has the effect of reducing the frequency of rescan based on the change in the injection level by omitting a new rescan when the 4K broadcast service list already exists. However, without using the process of S30003, when there is a change in the injection level, even when the 4K broadcast service list already exists, it may be configured to perform a rescan every time. In this case, there is an effect that the current reception status of 4K broadcast can be more accurately reflected in the service list.

[0352] Next, in the process of S30004, it waits until it becomes possible to perform a rescan. Specifically, for the third tuner / demodulator unit 130L, if the user is watching or the tuner / demodulator unit is operating in the recording state, a rescan is not performed. When the tuner / demodulator unit shifts to a state where it is not operating, for example, the standby state, the process proceeds to S30005. If there are multiple third tuner / demodulator units 130L in the broadcast receiving apparatus 100, even if there is a tuner / demodulator unit that is operating, such as when the user is watching or in the recording state, if the other tuner / demodulator units are not operating and are in the standby state, a rescan can be performed using the tuner / demodulator unit in the standby state. Next, in the process of S30005, a scan of the 4K broadcast service transmitted by the lower layer modulation wave is performed using the third tuner / demodulator unit 130L. Note that the time for performing the scan may be specified in advance by the broadcast receiving apparatus 100, or the user may be able to set the scan time.

[0353] Subsequently, it is confirmed whether a new 4K broadcast service list has been added as a result of the scan (S30006). If the service list has not been added (if no new 4K broadcast service has been added), it means that the broadcast receiving apparatus 100 is not included in the new reception range even after the reception range of the lower layer is expanded by changing the injection level. Therefore, the process ends. If the service list has been added, the added service list as a result of the rescan is presented to the user (S30007). If a scan is executed during the standby state and the service list has been added, when the user turns it on, it may first display that 4K broadcast service reception has become possible, and further display the additional service list. Note that since reception of 4K broadcast is possible if a service list for 4K broadcast can be created, the process of S30007 is not necessarily required.

[0354] According to the example described with reference to FIG. 17, the broadcast receiving apparatus 100 can detect a change in the injection level and use this as a trigger to start a rescan. This makes it possible to start a rescan more suitably. Note that, in the expression "trigger to start a rescan", "start a rescan" may mean starting a rescan by the process of S30005, or may mean starting to wait until the rescan becomes possible in the process of S30004. This is the same in all of the explanations of the modified examples of the "trigger to start a rescan" described below. Also, in either the example of FIG. 17 or any of the other examples described hereinafter, the situation in which a "trigger to start a rescan" occurs has the same meaning as the broadcast receiving apparatus 100 recognizing or identifying that "rescan" is necessary. Therefore, in any of the explanations of the example of FIG. 17 or the other examples described hereinafter, in the situation where a "trigger to start a rescan" has occurred, the broadcast receiving apparatus 100 recognizes or identifies that "rescan" is necessary.

[0355] <Rescan by Detection of Upper Layer Modulation Parameter Change> In the description of FIG. 17 above, in process S30002, a change in the injection level was detected, and based on this, a rescan was started. On the other hand, as another modification example, instead of detecting a change in the injection level as the trigger for starting the rescan, it may be possible to detect a change in the modulation parameter of the upper layer modulation wave. This is because when changing the injection level, it is necessary to change the required C / N of the upper layer modulation wave as well. For example, in the examples of FIGS. 14(1) and 14(2), in order to change the injection level from injection level 30112 to level 30212, the required C / N of the upper layer modulation wave is changed from required C / N 30111 of the upper layer modulation wave to 30211. When detecting a change in the modulation parameter of the upper layer modulation wave as the trigger for starting the rescan, the modulation parameter of the upper layer modulation wave is obtained from the TMCC information and / or AC information during the initial scan or rescan, and is stored in the non-volatile memory of ROM 103 or the various information storage areas 1019 of the storage unit 110. Then, the modulation parameter of the upper layer modulation wave newly obtained from the newly received TMCC information and / or AC information is compared with the modulation parameter of the upper layer modulation wave stored in the non-volatile memory of ROM 103 or the various information storage areas 1019 of the storage unit 110, and the presence or absence of a change is detected. As a result of this detection process, if there is a change in the modulation parameter of the upper layer modulation wave, a rescan may be started.

[0356] As described above, the broadcast receiving apparatus 100 can detect a change in the modulation parameter of the upper layer modulation wave and use this as a trigger for starting a rescan. Thereby, it becomes possible to start the rescan more suitably.

[0357] <Rescan by Detection of Increase in Modulation Wave Level> In the description of FIG. 17 above, in process S30002, a change in the injection level was detected, and based on this, a rescan was started. In contrast, as another variation of the "trigger for starting a rescan," the broadcast receiving apparatus 100 may determine the necessity for a rescan by detecting an increase in the modulated wave level that it receives. The modulated wave received by the broadcast receiving apparatus 100 increases when the modulated wave level output transmitted from the radio tower 30300 is raised. Alternatively, it may increase when the transmission environment between the radio tower 30300 and the broadcast receiving apparatus 100 is improved.

[0358] FIG. 18 shows an example of the modulated wave before and after an increase in the modulated wave level. FIG. 18(1) shows the same modulated wave as FIG. 14(1). FIG. 18(2) shows the modulated wave when only the modulated wave level is increased without changing the modulation parameters or the injection level. The upper layer modulated wave 30110 has increased in modulated wave level to become the upper layer modulated wave 30710. The lower layer modulated wave 30120 has increased in modulated wave level to become the lower layer modulated wave 30720. Also, the C / N of the lower layer modulated wave 30122 has increased to become the C / N of the lower layer modulated wave 30722. On the other hand, the required C / N of the upper layer modulated wave 30111 and the required C / N of the lower layer modulated wave 30121 do not change. The injection level 30112, which is a value indicating the difference in signal level in relative ratio (dB), also does not change in principle.

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

[0360] FIG. 18(4) shows the modulated wave received by the broadcast receiving apparatus 30102 when transmitting the modulated wave of FIG. 18(2) with an increased modulation wave level. The upper layer modulated wave 30810 and the lower layer modulated wave 30820 have a higher modulation wave level than the upper layer modulated wave 30510 and the lower layer modulated wave 30520 of FIG. 18(3), respectively. Also, the injection level 30112 does not change in principle, but the lower layer modulated wave C / N 30822 increases compared to the lower layer modulated wave C / N 30522 of FIG. 18(3). In the example of FIG. 18(4), the lower layer modulated wave C / N 30822 is greater than the required C / N 30121 of the lower layer modulated wave. That is, in the example of FIG. 18(4), it shows that the broadcast receiving apparatus 30102 has transitioned from a state where it could not receive and display a 4K broadcast program transmitted by the lower layer modulated wave 30520 to a state where it can receive and display a 4K broadcast program transmitted by the lower layer modulated wave 30820. In this state, the broadcast receiving apparatus 30102 can newly display a 4K broadcast program by performing a rescan. Therefore, detecting this state transition and using it as a trigger to start a rescan is sufficient.

[0361] Specifically, instead of detecting a change in the injection level in the process S30002 of FIG. 17, it is sufficient to detect that the lower layer modulated wave C / N 30822 has become greater than the required C / N 30121 of the lower layer modulated wave and use it as a trigger to start a rescan. In order to perform such detection, the broadcast receiving apparatus 100 needs to grasp both the lower layer modulated wave C / N 30822 and the required C / N 30121 of the lower layer modulated wave.

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

[0363] Next, the required C / N 30121 of the lower-layer modulation wave cannot be directly obtained. Therefore, for example, the required C / N 30121 of the lower-layer modulation wave necessary for transmitting a 4K broadcast program may be assumed in advance and stored in the non-volatile memory of the ROM 103 or various information storage areas 1019 in the broadcast receiver 100.

[0364] As another example of obtaining the required C / N 30121 of the lower-layer modulation wave, the value of the required C / N 30121 of the lower-layer modulation wave may be transmitted using the TMCC signal, AC signal, or free area in the packet stream of the upper-layer modulation wave, and the broadcast receiver 100 may obtain this. At this time, instead of directly transmitting the required C / N 30121 of the lower-layer modulation wave, the modulation parameter of the lower-layer modulation wave may be transmitted, and the required C / N 30121 of the lower-layer modulation wave may be derived based on the modulation parameter obtained in the broadcast receiver 100. In this case, in the broadcast receiver 100, the required C / N 30121 of the lower-layer modulation wave may be derived using the arithmetic formula or look-up table provided in advance and the obtained modulation parameter.

[0365] Then, the required C / N 30121 of the lower layer modulation wave obtained in this way or stored in advance in the non-volatile memory of the ROM 103 or the various information storage areas 1019 is compared with the C / N 30822 of the lower layer modulation wave calculated by the above-described calculation process, and it is only necessary to detect that the C / N 30822 of the lower layer modulation wave has become larger than the required C / N 30121 of the lower layer modulation wave.

[0366] According to the example described with reference to FIG. 18, it is possible to detect an increase in the modulation wave level received by the broadcast receiving apparatus 100 and use this as a trigger for starting a rescan. As a result, it becomes possible to start a rescan more suitably.

[0367] <Rescan by Detection of 4K Broadcast> Also, as another modification of the determination method in the process S30002 of FIG. 17, regardless of whether or not the injection level is changed, when there is no 4K service list, the third tuner / demodulator 130L intermittently repeats the reception process of the lower layer modulation wave, and the necessity of a rescan may be determined based on whether or not the lower layer modulation wave can be received. When the reception of the lower layer modulation wave is confirmed, it is determined that the broadcast receiving apparatus 100 is newly included within the receivable range, and the process proceeds to S30004, and it may be waited until it becomes possible to perform a rescan. The reception process of the lower layer modulation wave that is intermittently repeated may be performed periodically, such as once a day, or may be performed under aperiodic conditions.

[0368] <Rescan Based on Change Date Information or Change Time Information> As another modification example of the determination method in the process S30002 of FIG. 17, the broadcast receiving apparatus 100 may acquire an injection level change date (or an injection level change time including the injection level change date), and perform a rescan when the injection level change date (or the injection level change time) is reached. This is also another modification example of the "trigger for starting rescan". First, store and transmit the injection level change date in the TMCC information and / or the AC information. For example, the injection level change date information (or the injection level change time information including the injection level change date information) may be transmitted using the undefined area of the transmission parameter addition information shown in FIG. 15. The transmitted information is acquired by the third tuner / demodulator 130L of the broadcast receiving apparatus 100. The broadcast receiving apparatus 100 may determine that a rescan is necessary when the current date (or the current time) managed by the current time information or the like reaches the injection level change date (or the injection level change time). When it is determined that a rescan is necessary by the said process, the process S30004 may be started.

[0369] As described above, by comparing the injection level change date acquired by the broadcast receiving apparatus 100 with the current date, it is possible to use the fact that the current date has reached the injection level change date as a trigger for starting a rescan. Or by comparing the injection level change time acquired by the broadcast receiving apparatus 100 with the current time, it is possible to use the fact that the current time has reached the injection level change time as a trigger for starting a rescan. Thereby, it becomes possible to start a rescan more suitably.

[0370] Note that the broadcast receiving apparatus 100 may acquire the current date and the current time from MH-TOT or the like transmitted by a broadcast wave.

[0371] In this way, the injection level change date or the injection level change time can be used as a trigger for starting the rescan. As a result, the broadcast receiving apparatus 100 can grasp the injection level change date or the injection level change time in advance, and can more preferably start the rescan.

[0372] <Inquiry display to the user about whether to start the rescan> As a modification of the process S30004 in FIG. 17, it is also possible to change to a process of immediately notifying the user of the necessity of rescan without waiting for the rescan possible state. Specifically, instead of entering the standby state in the process S30004, a display explaining the possibility of receiving a 4K broadcast program and the necessity of rescan is performed. Thus, the user may be configured to select whether to start the rescan. When the user selects to start the rescan, the rescan process may be immediately started, and when the user does not select to start, the process may return to the rescan possible state standby process S30004.

[0373] In this way, the selection result of the user with respect to the inquiry about whether to start the rescan presented to the user can be used as a trigger for starting the rescan. As a result, it is possible to more preferably start the rescan reflecting the convenience of the user.

[0374] As described above, the examples of the embodiments of the present invention have been described using Examples 1 and 2. However, the configuration for realizing the technology of the present invention is not limited to the above-described examples, and various modifications are conceivable. For example, a part of the configuration of one example can be replaced with the configuration of another example, and the configuration of another example can be added to the configuration of one example. All of these belong to the scope of the present invention. Also, the numerical values, messages, etc. appearing in the text and the drawings are merely examples, and using different ones will not impair the effects of the present invention.

[0375] The functions and the like of the present invention described above may be realized in hardware by designing a part or all of them, for example, in an integrated circuit. Alternatively, they may be realized in software by a microprocessor unit or the like interpreting and executing an operation program that realizes each function and the like. It is also possible to use both hardware and software in combination.

[0376] Note that the software for controlling the broadcast receiving apparatus 100 may be stored in advance in the ROM 103 and / or the storage unit 110 of the broadcast receiving apparatus 100 at the time of product shipment. It may be acquired from another application server 500 or the like on the Internet 200 via the LAN communication unit 121 after product shipment. Further, the software stored in a memory card, an optical disk, or the like may be acquired via the expansion interface unit 124 or the like. Similarly, the software for controlling the portable information terminal 700 may be stored in advance in the ROM 703 and / or the storage unit 710 of the portable information terminal 700 at the time of product shipment. It may be acquired from another application server 500 or the like on the Internet 200 via the LAN communication unit 721 or the mobile phone network communication unit 722 after product shipment. Further, the software stored in a memory card, an optical disk, or the like may be acquired via the expansion interface unit 724 or the like.

[0377] Also, the control lines and information lines shown in the drawings indicate those considered necessary for explanation, and do not necessarily show all the control lines and information lines on the product. In reality, it may be considered that almost all components are interconnected.

Explanation of Reference Numerals

[0378] 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, 194: Audio selection unit, 195: Speaker unit, 196: Audio output unit, 180R: Remote controller, 200, 200T, 200L, 200B: Antenna, 300, 300T, 300L: Radio tower, 400C: Headend of cable TV station, 400: Broadcast station server, 500: Service provider server, 600: Mobile phone communication server, 600B: Base station, 700: Portable information terminal, 800: Internet, 800R: Router device.

Claims

【Claim 1】 A system including a transmitting device that transmits a transmission wave of digital broadcasting via a radio tower and a receiving device that receives the transmission wave of the digital broadcasting, wherein the transmitting device transmits a transmission wave in which information regarding an injection level is stored via the radio tower, and the receiving device includes a tuner that receives the transmission wave in which the information regarding the injection level is stored, wherein the information regarding the injection level is information based on a change in a difference between signal levels of a plurality of transmission waves having different signal levels transmitted at the same frequency, and a control unit, wherein the control unit detects that the information regarding the injection level included in the transmission wave received by the tuner has been changed in a direction in which the level decreases, thereby identifying that a rescan process, which is a broadcast reception setting process by the tuner, is necessary. When a channel identified as requiring the rescan process does not exist in a service list, the control unit executes the rescan process, and when a channel identified as requiring the rescan process exists in the service list, the control unit controls not to execute the rescan process, a system.

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