JP6355263B2 - Receiving apparatus, receiving method, and program - Google Patents

Description

  The present invention relates to a receiving device, a receiving method, and a program.

As a next-generation television broadcasting service, test broadcasting of 4K (3840 × 2160 or 4060 × 2160) ultra-high-definition television broadcasting (UHDTV: Ultra High Definition Television, hereinafter referred to as 4K broadcasting) has been started. Furthermore, research and development relating to 8K (7680 × 4320) ultra-high-definition television broadcasting (hereinafter referred to as 8K broadcasting) is underway.
On the roadmap (see Non-Patent Document 1) announced by the Ministry of Internal Affairs and Communications in September 9, 2014, practical broadcasting of 4K ultra-high definition television broadcasting (UHDTV: Ultra High Definition Television) started in 2015 in Japan. In addition, practical broadcasting of 8K ultra-high-definition television broadcasting has started. In this road map, 4K and 8K broadcasts are scheduled to be distributed by satellite broadcasts, cable television broadcast networks, IPTV, and the like. Further, according to this road map, it is proposed that experimental broadcasting of 8K broadcasting will be started from 2016, and that broadcasting by satellite broadcasts 4K broadcasting and 8K broadcasting in a time division manner.

  It takes time to disseminate display devices compatible with 4K / 8K broadcasting. For this reason, even if the experimental broadcasting of 8K broadcasting is started, it is conceivable that a television that supports only 4K broadcasting is sold at a lower price than a television that supports 8K broadcasting. As a result, even if the experimental broadcast of 8K broadcast starts, it is considered that there are not a few viewers who purchase a television that supports only 4K broadcast.

“Outline of Follow-up Meeting on 4K / 8K Roadmap Interim Report”, September 9, 2014, [online], Ministry of Internal Affairs and Communications, [March 3, 2015 search], Internet, <URL: http: // www.soumu.go.jp/main_content/000312825.pdf>

  However, since a television that supports only 4K broadcasting cannot display 8K broadcasting, nothing is displayed on the screen, sound is silent, and the viewer may misunderstand that this is a malfunction of the receiver.

  The present invention has been made in view of the above points, and even when a broadcast with a resolution higher than the resolution supported by the receiving device is received, the situation in which the receiving device is receiving is notified to the viewer. An object of the present invention is to provide a receiving device, a receiving method, and a program.

(1) The present invention has been made to solve the above-described problem, and a receiving apparatus according to one embodiment of the present invention receives a broadcast wave including program data and configuration data including information related to the program. Whether or not the resolution of the video data included in the program data is a resolution that can be displayed on the display unit based on information indicating the resolution of the video included in the configuration data received by the reception unit and the reception unit. When the comparison unit determines that the resolution of the video data cannot be displayed on the display unit by the comparison unit, it is determined whether there is a sub-audio different from the main audio, and the sub-audio is present In this case, only the audio is decoded from the broadcast wave, and the resolution of the video data can be displayed on the display unit by the audio switching unit that outputs the sub audio out of the decoded audio and the comparison unit. When the Most is determined, and a notification unit for notifying the information indicating that receives the video data and outputs the sub-audio.

(2) In the reception method of one aspect of the present invention, the reception unit receives a broadcast wave including program data and configuration data including information related to the program, and the comparison unit includes the reception procedure. A comparison procedure for determining whether the resolution of the video data included in the program data is a resolution that can be displayed on the display unit based on the information indicating the resolution of the video included in the configuration data received by When the audio switching unit determines that the resolution of the video data cannot be displayed on the display unit by the comparison procedure, a determination procedure for determining whether there is sub audio different from the main audio, and a decoding unit A decoding procedure for decoding only the audio from the broadcast wave, and an audio switching unit demodulated by the decoding procedure when it is determined by the determination procedure that the sub-audio is present When the voice switching procedure for outputting the sub-audio in the voice and the notification unit determine that the resolution of the video data cannot be displayed on the display unit by the comparison procedure, the video data is received and the sub-audio is received. A notification procedure for reporting information indicating that the information is output.

(3) In addition, the program according to one embodiment of the present invention is received by the computer of the reception apparatus by a reception procedure for receiving broadcast waves including program data and configuration data including information related to the program, and the reception procedure. A comparison procedure for determining whether or not the resolution of the video data included in the program data is a resolution that can be displayed on a display unit based on information indicating the resolution of the video included in the configuration data; and the comparison procedure When it is determined that the resolution of the video data cannot be displayed on the display unit, a determination procedure for determining whether there is a sub-audio different from the main sound, and a determination that the sub-audio is present by the determination procedure A decoding procedure for decoding only the audio from the broadcast wave, and outputting the sub-audio among the audio decoded by the decoding procedure. Notification for notifying information indicating that the video data is received and the secondary audio is output when it is determined by the voice switching procedure and the comparison procedure that the resolution of the video data cannot be displayed on the display unit And execute the procedure.

  ADVANTAGE OF THE INVENTION According to this invention, even when it is a case where the broadcast of the resolution higher than the resolution which the receiving apparatus respond | corresponds, the condition which the receiving apparatus is receiving can be alert | reported to a viewer.

It is a block diagram which shows the structure of the digital broadcasting system which concerns on embodiment. It is a block diagram which shows the structure of the transmitter which concerns on embodiment. It is a figure explaining the example of the structure of the protocol stack used for the broadcasting system which concerns on embodiment. It is the schematic which shows the data structure of MPT which concerns on embodiment. It is a figure which shows the example of the video component descriptor which concerns on embodiment. It is a figure which shows the example of the information described by the video signal resolution which concerns on embodiment. It is a figure which shows the example of the MH-voice component descriptor which concerns on embodiment. It is a figure which shows the example of the information described by the component classification which concerns on embodiment. It is a block diagram which shows the structure of the receiver which concerns on embodiment. It is a figure which shows the example of a display of the caution message at the time of 8K broadcast reception which concerns on embodiment. It is a flowchart which shows the procedure of the display process and alerting | reporting process which concern on embodiment.

  This embodiment will be described with reference to the drawings. In the following description, the digital broadcast video reproduction apparatus of the present invention is simply referred to as a “reception apparatus”. Further, the receiving device includes a display unit.

  FIG. 1 is a block diagram showing a configuration of a digital broadcast system 1 according to the present embodiment. As shown in FIG. 1, the digital broadcasting system 1 includes a receiving device 10, a transmitting device 20, and a broadcasting satellite 41. The transmission device 20 constitutes broadcasting equipment possessed by a broadcasting company. In the digital broadcasting system 1, the number of receiving devices 10 and transmitting devices 20 is generally plural, but in the following description, in order to facilitate the explanation, the receiving device 10 and the transmitting device A case of the digital broadcasting system 1 in which the number of units 20 is one will be described.

  Further, in the following description, as a media transport system of digital broadcasting in the digital broadcasting system 1, for example, ARIB (Association of Radio Industries and Businesses) MMT (MPEG Media Media) described in the STD-60 standard A case where the (Transport) method is adopted will be described. In the present embodiment, a case where the broadcast wave to be transmitted is only 4K broadcast or 8K broadcast according to the program will be described as an example.

  The transmission device 20 is, for example, a transmission device provided in a broadcasting company such as a broadcasting station. The transmission device 20 transmits the program data i1 to the broadcast satellite 41. The program data is content data of a program including at least one of video data and audio data. In the following description, it is assumed that the program data is video content including both video data and audio data. Note that each of the video data and the audio data included in the program data is data encoded by a predetermined encoding method. For example, the video data is H.264. H.265, data encoded by an encoding method such as HEVC (High Efficiency Video Coding). Further, for example, the audio data is data encoded by an encoding method such as ISO / IEC 14496 Part 3, so-called MPEG-4 audio.

  The broadcast satellite 41 receives the program data i1 transmitted from the transmission device 20, and modulates the received program data i1. The broadcast satellite 41 transmits the modulated program data radio wave toward the ground. The broadcasting satellite 41 is at least one of a satellite broadcasting satellite (BS) and a communication satellite (CS). The broadcast wave transmitted from the transmission device 20 is transmitted to the reception device 10 via a ground wave, a wired transmission line such as a cable, or a broadcast satellite. In the example illustrated in FIG. 1, a case where a broadcast wave is transmitted via the broadcast satellite 41 is illustrated.

  The receiving device 10 receives program data broadcast via the broadcast satellite 41. In the following description, it is assumed that the receiving device 10 is a television receiver (television, TV) that can display 4K broadcast and cannot display 8K broadcast. That is, the receiving device 10 receives the broadcast wave transmitted from the transmitting device 20, and when the resolution of the program data that is the video content included in the received broadcast wave is higher than the resolution of the receiving device 10, only the audio signal is received. The information is decoded and displayed on the display unit 112 (see FIG. 9), indicating that the broadcast is received but only the sound is output. The configuration of the receiving device 10 will be described later.

<Configuration of Transmitting Device 20>
Next, the configuration of the transmission device 20 according to the present embodiment will be described.
FIG. 2 is a block diagram illustrating a configuration of the transmission device 20 according to the present embodiment. As illustrated in FIG. 2, the transmission device 20 includes a program data generation unit 201, a configuration information generation unit 202, a multiplexing unit 203, an encryption unit 204, and a transmission unit 205.

The program data generation unit 201 acquires video data indicating video configuring a broadcast program and audio data indicating audio configuring the broadcast program.
The program data generation unit 201 encodes the acquired video data using a predetermined video encoding method. The predetermined video encoding method is, for example, ISO / IEC 23008 HEVC (International Organization for Standardization / International Electronic Commission 230308 Part2 High Efficiency Video Standard), which is simply called “High Coding C”.
The program data generation unit 201 encodes the acquired audio data using a predetermined video encoding method. The predetermined audio encoding method is, for example, an audio encoding method defined by ISO / IEC 14496 Part 3 (also simply referred to as MPEG-4 audio. MPEG is an abbreviation for Moving Picture Experts Group). is there.

  The program data generation unit 201 generates program data in a predetermined format from the encoded video data, audio data, and MMT-SI (MMT-System Information), and outputs the generated program data to the multiplexing unit 203. In addition, the MMT-SI includes a message, a table, and a descriptor set by a broadcaster described later. MMT-SI will be described later. Program data in a predetermined format is, for example, MPU (Media Processing Unit) defined by ISO / IEC 23008 Part1 MMT (MPEG Media Transport, also simply referred to as MMT). Each MPU includes video data, audio data, and MMT-SI of a unit that can perform video and audio decoding processing.

The configuration information generation unit 202 acquires component element information that is information for configuring a broadcast program and a service provided along with the broadcast. The component information includes a list of assets that are components of broadcast programs and services, that is, video, audio, and the like, and information indicating their requirements.
For example, in the case of transmitting a plurality of broadcast videos at the same time, such as when broadcasting by a hierarchical transmission method, the above component information includes information on the resolution of each video and information on the priority with which each video is displayed. Etc. are also included in the component information.
The configuration information generation unit 202 generates configuration information in a predetermined format from the acquired component element information, and outputs the generated configuration information to the multiplexing unit 203. The configuration data in the predetermined format is, for example, an MPT (MMT Package Table) that configures MMT-SI (MMT-System Information). An example of MPT will be described later.

  The multiplexing unit 203 multiplexes the program data output from the program data generation unit 201 and the configuration information output from the configuration information generation unit 202 to multiplex a predetermined format (for example, a TLV (Type Length Value) packet). Generate data. The multiplexing unit 203 outputs the generated multiplexed data to the encryption unit 204.

  The encryption unit 204 encrypts the multiplexed data output from the multiplexing unit 203 by using a predetermined encryption method (for example, AES (Advanced Encryption Standard) or MULTI2). The encryption unit 204 outputs the encrypted multiplexed data to the transmission unit 205. The multiplexed data output to the transmission unit 205 includes video data, main audio data, audio explanation for visually impaired persons (hereinafter also referred to as explanation audio), and structure information.

  The transmission unit 205 transmits the multiplexed data output from the encryption unit 204 to the reception device 10 via the broadcast satellite 41 that is a broadcast transmission path. Here, the transmission unit 205 modulates a carrier wave having a predetermined carrier frequency with multiplexed data that is a baseband signal, and transmits a radio wave (broadcast wave) in a channel band corresponding to the carrier frequency by an antenna (not shown). Radiate.

<Structure of protocol stack of system using MMT>
Next, an example of the structure of the protocol stack of the system using the MMT will be described.
FIG. 3 is a diagram for explaining an example of the structure of the protocol stack used in the broadcast system according to the present embodiment. As shown in FIG. 3, the protocol stack used in the broadcasting system includes TMCC (Transmission and Multiplexing Configuration Control), time information, encoded video data, encoded audio data, encoded subtitle data, MMT- It is configured to include applications described in SI and HTML5 standards (also simply referred to as applications), EPG (electronic program guide), content download data, and the like. The code | symbol of the video signal and audio | voice signal of a broadcast program is MFU (Media Fragment Unit) / MPU. Then, the MFU / MPU is put on the MMTP payload, converted into an MMTP packet by the transmission device 20, and transmitted by the transmission device 20 as an IP packet. In the transmission of data content, the data is converted into MMTP packets by the transmission device 20 and transmitted by the transmission device 20 as IP packets. The IP packet configured as described above is transmitted by the transmission device 20 in the form of a TLV packet when broadcast using the broadcast transmission path. One IP packet or one header-compressed IP packet is transmitted as one TLV packet by the transmitter 20 (see ARIB STD-B32 and STD-B60).

  Further, in the protocol stack used for the broadcasting system, two types of control information, MMT-SI and TLV-SI, are provided. MMT-SI is control information indicating the configuration of a broadcast program. In MMT-SI, an MMT control message format is used, which is carried on the MMTP payload by the transmission device 20 to form an MMTP packet, and is transmitted by the transmission device 20 as an IP packet. TLV-SI is control information related to multiplexing of IP packets, and provides information for channel selection and correspondence information between IP addresses and services.

  TMCC is control information that is inserted into a transmission frame and transmitted in a hierarchical modulation scheme that specifies a modulation scheme and an error correction scheme for each unit (slot) of a signal on a transmission path. HEVC (High Efficiency Video Coding) is a technique for encoding a video signal. AAC (Advanced Audio Coding) and ALS (Audio Lossless Coding) are methods for encoding audio signals. UDP / IP (User Datagram Protocol / Internet Protocol) is one of the protocols used for communication. TLV (TYPE LENGTH VALUE) is one of data multiplexing techniques. TLV is composed of three types of data encoding: data type (Type), length (Length), and value (Value).

<Program information, MMT-SI>
Next, an example of program information will be described.
Specifically, the program information is MMT-SI (transmission control signal). The MMT-SI includes a message, a table, and a descriptor.
First, the MMT-SI message will be described.
The message includes a Package Access (PA) message, an M2 section message, a CA message, an M2 short section message, a data transmission message, and a message set by the operator.

The PA message is control information for transmitting an MMT-SI table as an MMT-SI entry point.
The M2 section message is control information for transmitting a section extension format of MPEG-2 Systems.
The CA message is control information for transmitting information related to the conditional access system. The broadcast received by limited reception is a broadcast that cannot be viewed on the receiving device 10 unless the broadcaster and the viewer have a viewing contract.

The M2 short section message is control information for transmitting a section short format of MPEG-2 Systems.
The data transmission message is control information for transmitting a table related to data transmission.
The message set by the broadcaster is control information set by the broadcaster.

  Next, of the MMT-SI tables, tables used in the present embodiment will be described. The digital broadcasting system 1 can handle all tables related to the MMT system. The tables are MPT (MMT Package Table, MMT Package Table), MH-EIT (MH-Event Information Table, MH-Event Information Table), MH-BIT (MH-Broadcaster Information Table, MH-Broadcaster Information Table), MH. -Includes various tables such as SDT (MH-Service Description Table, MH-Service Description Table).

The MH-EIT is a table for transmitting information related to a program such as a program name, broadcast date and time, and description of broadcast contents.
The MH-BIT is a table used for presenting broadcaster information existing on the network.

<Data structure of MPT>
Next, MPT will be described.
FIG. 4 is a schematic diagram showing a data structure of MPT used in the broadcasting system according to the present embodiment. As shown in FIG. 4, MPT (MMT_Package_Table ()) includes an MPT descriptor area (MPT_descriptors_byte). The MPT descriptor area (MPT_descriptors_byte) is an area in which an MPT descriptor is described. When the program is a multi-view program, the MH-component group descriptor (MH-Component_Group_Descriptor ()) is included in the MPT descriptor area. On the other hand, when the program is not a multi-view program, the MH-component group descriptor is not included in the descriptor area of the MPT.
In addition, the MPT includes an asset type (asset_type) for each asset. In the asset type, a code indicating the type of asset is described. In the asset type, for example, hcv1 indicating video data encoded by HEVC and mp4a indicating audio data encoded by MPEG-4 audio are described.

<Description of data structure of video component descriptor>
Next, an example of a video component descriptor (Video_Component_Descriptor ()) will be described.
FIG. 5 is a diagram illustrating an example of a video component descriptor according to the present embodiment. As shown in FIG. 5, the video component descriptor includes a descriptor tag (descriptor_tag), a descriptor length (descriptor_length), a video signal resolution (video_resolution), a video signal aspect ratio (video_aspect_ratio), a video scan flag (video_scan_flag), and a video scan flag (video_scan_flag). It includes a signal frame rate (video_frame_rate), a component tag (component_tag), and a language code (ISO_639_language_code).

As shown in FIG. 5, the descriptor tag describes information for identifying each descriptor. Descriptor length describes the number of data bytes following this field. The video signal resolution (video_resolution) describes the vertical resolution of the video signal and is encoded according to FIG.
FIG. 6 is a diagram illustrating an example of information described in the video signal resolution according to the present embodiment. As shown in FIG. 6, when the video signal resolution value is 5, it means the spatial resolution of 2K broadcast (1080 (1125)), and when the video signal resolution value is 6, the spatial resolution of 4K broadcast ( 2160), and when the value of the video signal resolution is 7, it means the spatial resolution (4320) of 8K broadcasting.

Returning to FIG. 5, the video signal aspect ratio (video_aspect_ratio) describes the aspect ratio of the video signal.
In the video scan flag (video_scan_flag), a flag indicating whether the video signal is an interlace signal or a progressive signal is described. The video signal frame rate describes the frame rate of the video signal. In the component tag (component_tag), a label for identifying the component stream is described.
In the language code (ISO_639_language_code), information for identifying the language of the component (speech or data) and the language of the character description included in this descriptor is described.

<Description of Data Structure of MH-Audio Component Descriptor>
Next, an example of the MH-audio component descriptor (MH-Audio_Component_Descriptor ()) will be described.
FIG. 7 is a diagram illustrating an example of the MH-voice component descriptor according to the present embodiment. As shown in FIG. 7, the MH-voice component descriptor includes a descriptor tag (descriptor_tag), a descriptor length (descriptor_length), a component content (stream_content), a component type (component_type), a component tag (component_tag), and a stream format type. (Stream_type), simulcast group identification (simulcast_group_tag), ES multilingual flag (ES_multi_lingual_flag), main component flag (main_component_flag), sound quality display (quality_indicator), language_sampling code 9_language_code), etc. contains.

In FIG. 7, the component content represents the type of stream, and the component type (component_type) is encoded according to the type of audio component according to FIG.
FIG. 8 is a diagram illustrating an example of information described in the component type according to the present embodiment. As shown in FIG. 8, the encoding is performed according to the value for which the component type is set. In this embodiment, when the received broadcast is an 8K broadcast, the “voice explanation for visually impaired” whose component type is “0x40” is extracted and output.

Returning to FIG. 7, the component tag is a label for identifying the component stream.
In the stream format type, information indicating the format of the audio stream is described by stream_type defined in ISO / IEC 13818-1.
In the simulcast group identification, the same number is given to components that perform simulcast (same content is transmitted by different encoding methods). Also, the simulcast group identification is set to 0xFF for components that are not performing simulcast.
The ES multilingual flag is set to “1” when bilingual (ES multilingual mode) multiplexing is performed in the ES in the 1/0 + 1/0 mode.
In the main component flag, “1” is described when the audio component is the main audio, and in the 1/0 + 1/0 mode, “1” is described when the first audio component is the main audio.
In the sound quality display, information representing the sound quality mode is described.
In the sampling frequency, information indicating the sampling frequency is described.
Information indicating the language of the audio component is described in the language code.

<Description of Configuration of Receiving Device 10>
Next, the configuration of the receiving device 10 according to the present embodiment will be described.
FIG. 9 is a block diagram illustrating a configuration of the receiving device 10 according to the present embodiment. As illustrated in FIG. 9, the reception device 10 includes a reception unit 101, a demodulation unit 103, a separation unit 104, a control unit 105, a storage unit 106, an audio decoding unit 107, an audio switching unit 108, an audio reproduction unit 109, and a video decoding unit. 110, a video composition unit 111, a display unit 112, and an operation unit 113.

  The receiving unit 101 receives the broadcast wave transmitted from the transmission device 20 via the broadcast satellite 41. Based on the operation result output from the operation unit 113, the reception unit 101 identifies a broadcast channel band corresponding to the broadcast channel specified by the broadcast channel signal output from the control unit 105. The receiving unit 101 converts a received signal in a broadcast channel band received as a broadcast wave into multiplexed data that is a baseband signal. The receiving unit 101 outputs the converted multiplexed data to the demodulating unit 103.

  Demodulation section 103 demodulates the multiplexed data output from receiving section 101 by a demodulation scheme corresponding to the modulation scheme of transmitting apparatus 20, and outputs the demodulated multiplexed data to demultiplexing section 104. Note that the demodulation unit 103 performs error correction after demodulation or at the time of demodulation.

  The separation unit 104 separates the demodulated multiplexed data output from the demodulation unit 103 into program data and configuration information. The separation unit 104 outputs the configuration information to the control unit 105. Further, the separation unit 104 extracts audio data, video data, and MMT-SI from the program data. The separation unit 104 outputs the extracted audio data to the audio decoding unit 107 and outputs the video data to the video decoding unit 110. Further, the separation unit 104 outputs the extracted MMT-SI to the control unit 105.

  Audio data is input from the separation unit 104 to the audio decoding unit 107. The audio data includes main audio and sub audio. The sub audio includes audio explanation for visually impaired people. The input audio data is data encoded by a predetermined audio encoding method (for example, MPEG-4 audio). The audio decoding unit 107 decodes (decodes) the input audio data in response to a decoding instruction from the comparison unit 1053 of the control unit 105, and outputs the decoded audio signal to the audio switching unit 108. Note that the audio signal output to the audio switching unit 108 includes main audio and sub audio.

The voice switching unit 108 outputs a voice signal corresponding to the switching signal from the comparison unit 1053 among the voice signals output from the voice decoding unit 107. For example, when the output audio is not selected by the viewer and in the case of 4K broadcasting, the audio switching unit 108 switches to the main audio in accordance with the switching signal and outputs the main audio to the audio reproduction unit 109. When the output sound is not selected by the viewer and in the case of 8K broadcasting, the audio switching unit 108 switches to the audio commentary for the visually impaired person according to the switching signal, and the audio commentary for the visually impaired person is converted into the audio reproduction unit Output to 109.
The audio reproduction unit 109 reproduces the audio signal output from the audio decoding unit 107, and includes, for example, a speaker.

Video data is input from the separation unit 104 to the video decoding unit 110. The input video data is data encoded by a predetermined video encoding method (for example, HEVC, MPEG-2 video). The video decoding unit 110 decodes the video data input by the decoding method corresponding to the encoding method used for encoding in response to the decoding instruction from the comparison unit 1053, and generates the decoded video data. To do. The video decoding unit 110 outputs the decoded video data to the video synthesis unit 111.
For example, in the case of 4K broadcasting, the video decoding unit 110 decodes the video data in response to a decoding instruction, and outputs the decoded video data to the video synthesis unit 111. Alternatively, in the case of 8K broadcasting, the video decoding unit 110 does not decode the video data in response to a decoding instruction, and outputs, for example, black image data to the video synthesis unit 111. Note that the decoded video data is data indicating a signal value forming a video (frame image) at each time.

  When the notification unit 1054 of the control unit 105 outputs a caution message, the video synthesis unit 111 synthesizes an image of the input caution message with the video data output from the video decoding unit 110, and displays the synthesized video data as a display unit To 112. When the notification unit 1054 does not output a caution message, the video composition unit 111 outputs the video data output by the video decoding unit 110 to the display unit 112.

  The display unit 112 displays a video based on the video data output from the video synthesis unit 111. The display unit 112 includes a display, for example, a liquid crystal display, an organic EL (Electro Luminescence) display, and the like.

The control unit 105 includes a display resolution acquisition unit 1051, a broadcast resolution detection unit 1052, a comparison unit 1053, and a notification unit 1054.
The display resolution acquisition unit 1051 acquires a resolution that can be displayed by the display unit 112. Note that the resolution that can be displayed by the display unit 112 may be stored in the storage unit 106 in advance. When the displayable resolution is stored in the storage unit 106 in advance, the display resolution acquisition unit 1051 reads the displayable resolution from the storage unit 106 and acquires it. The display resolution acquisition unit 1051 outputs information indicating the acquired resolution to the comparison unit 1053 as information indicating the display resolution.

  The broadcast resolution detection unit 1052 extracts the video component descriptor from the MMT-SI output from the separation unit 104. The broadcast resolution detection unit 1052 detects the video signal resolution parameterized in the extracted video component descriptor, and outputs the detected video signal resolution to the comparison unit 1053 as information indicating the broadcast resolution.

The comparison unit 1053 acquires information indicating the display resolution output from the display resolution acquisition unit 1051 and information indicating the broadcast resolution output from the broadcast resolution detection unit 1052. The comparison unit 1053 compares the broadcast resolution and the display resolution based on the acquired information, and generates a decode instruction, a switching signal, and a broadcast information generation instruction according to the compared result. The comparison unit 1053 outputs the generated decoding instruction to the audio decoding unit 107 and the video decoding unit 110. The comparison unit 1053 outputs the generated switching signal to the voice switching unit 108. The comparison unit 1053 outputs the generated notification information generation instruction to the notification unit 1054.
In the case of 4K broadcasting, the comparison unit 1053 outputs a decoding instruction for decoding audio data to the audio decoding unit 107, and outputs a decoding instruction for decoding video data to the video decoding unit 110. The comparison unit 1053 outputs a switching signal for switching to the main voice to the voice switching unit 108. The comparison unit 1053 outputs a notification information generation instruction that does not generate a caution message to the notification unit 1054.
Alternatively, in the case of 8K broadcasting, the comparison unit 1053 outputs a decoding instruction for decoding audio data to the audio decoding unit 107, and outputs a decoding instruction for not decoding video data to the video decoding unit 110. The comparison unit 1053 outputs a switching signal for switching to the audio description for the visually impaired to the audio switching unit 108. The comparison unit 1053 outputs a notification information generation instruction for generating a caution message to the notification unit 1054.

  The notification unit 1054 generates a caution message with reference to the caution message stored in the storage unit 106 in response to the notification information generation instruction output from the comparison unit 1053, and the video composition unit 111 displays information indicating the generated caution message. Output to.

  The storage unit 106 stores various data such as a caution message, information that associates the value and meaning of the video signal resolution illustrated in FIG. 6, and information that associates the value and meaning of the component type illustrated in FIG. 8. Remember. The storage unit 106 is a storage medium, for example, HDD (Hard Disk Drive), flash memory, ROM (Read Only Memory), RAM (Random Access read / write Memory), or any of them. It is comprised including the combination of. Note that the storage unit 106 may store information indicating the resolution of the display unit 112.

  The operation unit 113 is, for example, an input interface that receives an operation signal from an electronic device such as an operation button, a remote controller, or a portable terminal device. The operation unit 113 detects an operation result operated by the viewer, and outputs the detected operation result to the control unit 105.

  FIG. 10 is a diagram showing an example of a caution message display when receiving 8K broadcast according to the present embodiment. As shown in FIG. 10, at the time of 8K broadcast reception, the receiving device 10 outputs a voice commentary (voice commentary) for the visually impaired, displays a caution message image g101 on a part of the screen of the display unit 112, and the rest For example, a black image g102 is displayed in the display area. The caution message image g101 in the example shown in FIG. 10 includes, for example, “8K broadcast is being received. Only audio is output”. Note that the caution message image g101 to be displayed is an example, and the present invention is not limited to this. A message indicating that display cannot be performed because the display resolution is different from the broadcast resolution and a message indicating that the audio explanation for the visually impaired is being reproduced may be included.

<Description of voice processing and notification processing>
Next, audio processing and notification processing according to the present embodiment will be described.
FIG. 11 is a flowchart showing a procedure of display processing and notification processing according to the present embodiment. In the example illustrated in FIG. 11, processing after a viewer selects a broadcast program channel via the broadcast satellite 41 will be described.

(Step S <b> 101) The receiving unit 101 receives a broadcast wave of a broadcast channel specified by the broadcast channel signal output from the control unit 105 among the broadcast waves transmitted by the transmission device 20.
(Step S102) The display resolution acquisition unit 1051 acquires a resolution that can be displayed by the display unit 112.

(Step S103) The broadcast resolution detection unit 1052 extracts a video component descriptor from the MMT-SI output from the separation unit 104. Subsequently, the broadcast resolution detection unit 1052 extracts the value of the video signal resolution set as a parameter in the extracted video component descriptor. Subsequently, the broadcast resolution detection unit 1052 detects the broadcast resolution based on the information indicating the meaning stored in the storage unit 106 in association with the extracted video signal resolution value.

(Step S <b> 104) The comparison unit 1053 determines whether or not the resolution of the received video can be displayed on the display unit 112 using the display resolution and the broadcast resolution. If the comparison unit 1053 determines that the video can be displayed (step S104; YES), the process proceeds to step S108. If the comparison unit 1053 determines that the video cannot be displayed (step S104; NO), the processing proceeds to step S105. Proceed. The displayable video is a video having a display resolution of 4K and a broadcast resolution of 4K or less. The video that cannot be displayed is a video having a display resolution of 4K and a broadcast resolution higher than 4K, for example, an 8K video.

(Step S105) The comparison unit 1053 outputs a decoding instruction for decoding audio data to the audio decoding unit 107, and outputs a decoding instruction for not decoding video data to the video decoding unit 110. Subsequently, the comparison unit 1053 outputs a switching signal for switching to the audio description for the visually impaired to the audio switching unit 108. Subsequently, the comparison unit 1053 outputs a notification information generation instruction for generating a caution message to the notification unit 1054. Subsequently, the voice decoding unit 107 performs decoding on the input voice data in response to a decoding instruction from the comparison unit 1053.

(Step S <b> 106) The audio switching unit 108 outputs the audio commentary for the visually impaired to the audio reproduction unit 109 according to the switching signal from the comparison unit 1053 among the audio signals output from the audio decoding unit 107. Subsequently, the audio reproduction unit 109 reproduces the audio signal output from the audio decoding unit 107.

(Step S107) The video composition unit 111 synthesizes the input caution message image with the video data output from the video decoding unit 110 in accordance with the notification information generation instruction output from the notification unit 1054, and combines the combined video data. Is displayed on the display unit 112 as shown in FIG. The video data in this case is, for example, black image data. The video composition unit 111 ends the process.

(Step S108) The comparison unit 1053 outputs a decoding instruction for decoding audio data to the audio decoding unit 107, and outputs a decoding instruction for decoding video data to the video decoding unit 110. Subsequently, the comparison unit 1053 outputs a switching signal for switching to the main voice to the voice switching unit 108. Subsequently, the comparison unit 1053 outputs a notification information generation instruction that does not generate a caution message to the notification unit 1054. Subsequently, the voice decoding unit 107 performs decoding on the input voice data in response to a decoding instruction from the comparison unit 1053. Subsequently, the video decoding unit 110 performs decoding on the input video data in response to a decoding instruction from the comparison unit 1053.

(Step S109) Since the notification unit 1054 has not output a caution message, the video composition unit 111 causes the display unit 112 to display the video data output by the video decoding unit 110. The video composition unit 111 ends the process.

  As described above, when the resolution of the received video data cannot be displayed on the display unit 112, the receiving apparatus 10 only decodes the audio data without decoding the video data. Then, the receiving device 10 outputs an audio commentary for the visually impaired, and notifies the display unit 112 of information indicating that only the audio is output because the broadcast is received but cannot be displayed. If the receiving device 10 receives a broadcast that cannot be received or displayed, and nothing is displayed on the display unit 112, the viewer (also referred to as a user) may misunderstand that the receiving device 10 is out of order. May be. According to the present embodiment, the audio commentary for the visually impaired is output, and the information indicating that only the audio is output because the broadcast is received on the display unit 112 but cannot be displayed is notified. The person can know that the received broadcast cannot be displayed on the receiving apparatus 10 and can know that the receiving apparatus 10 is not out of order. In addition, according to the present embodiment, when the display resolution and the broadcast resolution do not match, the audio description for the visually impaired is switched and output, so even if the viewer does not display the video on the display unit 112. Therefore, it is possible to obtain an effect that the contents being broadcast can be grasped to some extent by the audio commentary for the visually impaired.

  In the above-described example, when the resolution of the received video data cannot be displayed on the display unit 112, the comparison unit 1053 has described the example of selecting the audio description for the visually impaired person from the secondary audio. Not limited. When the resolution of the video data cannot be displayed on the display unit 112 and the audio description for the visually impaired is not included, the audio selected by the comparison unit 1053 may be sub audio other than the main audio.

  In the present embodiment, an example in which the audio commentary for the visually impaired is set in the sub-audio when the resolution of the video data cannot be displayed on the display unit 112 has been described, but the present invention is not limited to this. For example, the user may operate the operation unit 113 to select and set the sound to be output when the display resolution and the broadcast resolution do not match.

  As described above, the receiving device 10 of the present embodiment includes the receiving unit 101 that receives broadcast data including program data and configuration data that includes information related to the program, and the video included in the configuration data received by the receiving unit. A comparison unit 1053 for determining whether or not the resolution of the video data included in the program data is a resolution (display resolution) that can be displayed on the display unit based on information indicating the resolution (broadcast resolution) of When it is determined that the resolution of the video data cannot be displayed on the display unit, it is determined whether or not there is a secondary sound different from the main sound (for example, an audio commentary for the visually impaired). When it is determined that the resolution of the video data cannot be displayed on the display unit by the audio switching unit 108 that decodes only the audio from the broadcast wave and outputs the sub audio among the decoded audio and the comparison unit In comprises a notification unit 1054 for notifying the information indicating that the output of the sub-audio and the video data is received, the.

  With this configuration, according to the present embodiment, when the resolution of the received video data cannot be displayed on the display unit 112, the audio commentary for the visually impaired is output and the broadcast is received on the display unit 112. Since it cannot be displayed, information indicating that only audio is output is notified. In other words, according to the present embodiment, even when a broadcast with a resolution higher than the resolution supported by the receiving device 10 is received, it is possible to notify the viewer of the situation that the receiving device is receiving. As a result, the viewer can know that the received broadcast cannot be displayed on the receiving device 10, and can know that the receiving device 10 is not out of order because sub-audio is output. In addition, the viewer can know to some extent the contents of the program being broadcast by the secondary audio.

Further, in the receiving device 10 of the present embodiment, the sub-speech is a comment broadcast sound or a sound commentary for the visually impaired.
With this configuration, according to the present embodiment, when the resolution of the received video data cannot be displayed on the display unit 112, the viewer switches to the audio explanation for the visually impaired and outputs it, so that the viewer can view the video on the display unit 112. Even if it is not displayed, the contents being broadcast can be grasped to some extent by the audio commentary for the visually impaired.

Further, in the receiving apparatus 10 of the present embodiment, the secondary audio is audio selected by the user (viewer) by operating the operation unit 113.
With this configuration, according to the present embodiment, when the resolution of the received video data cannot be displayed on the display unit 112, the audio selected by the viewer is output, so that the viewer displays the video on the display unit 112. Even if it is not done, the contents being broadcast can be grasped to some extent by the audio commentary for the visually impaired.

In the receiving apparatus 10 of the present embodiment, the resolution (display resolution) that can be displayed on the display unit 112 is 4096 or 3840 pixels in the horizontal resolution, and the audio switching unit 108 has a horizontal resolution of 7680 in the video data. When there is sub-audio, the sub-audio is switched to the sub-audio, and the notification unit 1054 notifies the information indicating that the horizontal resolution of the video data is 7680 and the video data is received when there is sub-audio. .
With this configuration, according to the present embodiment, the resolution that can be displayed on the display unit 112 of the receiving device 10 corresponds to 4K broadcast, and even when 8K broadcast is received, sub audio is reproduced, By notifying the state being reproduced, it is possible to notify the viewer of the situation that the receiving device is receiving.

  In the above-described embodiment, the example in which the receiving device 10 is a television receiver (television, TV) has been described, but the present invention is not limited thereto. The receiving device 10 may be a device that can receive and reproduce main program data and subprogram data, such as an HDD (hard disk) recorder, an optical disk recorder, or the like. In addition, the receiving device 10 may not include the display unit 112.

  In the embodiment described above, an example of a television receiver (television, TV) in which the receiving device 10 can display 4K broadcasts has been described, but the present invention is not limited to this. For example, in the case where the receiving device 10 is a television receiver capable of displaying 2K broadcast, when the resolution of broadcast wave video data is higher than 2K, a caution message is notified without displaying video on the display unit 112, and sub audio May be output. Further, in the case where the receiving device 10 is a television receiver capable of displaying 8K broadcast, when the resolution of broadcast wave video data is higher than 8K, a caution message is notified without displaying video on the display unit 112, and sub-audio May be output.

  In the above-described embodiment, the case where the media transport system according to MMT (MPEG Media Transport) defined by MPEG-H is used as the transmission system for transmitting various data is exemplified. A method, for example, a method defined in MPEG-2 Systems may be used. In addition, a data format, an encryption method, and an encoding method related to transmission may be a format or a method defined by the transmission method.

  Moreover, you may make it implement | achieve a part of receiver 10 in embodiment mentioned above with a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed. Here, the “computer system” is a computer system built in the recognition data transmission apparatus, and includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In this case, a volatile memory inside a computer system that serves as a server or a client may be included that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

DESCRIPTION OF SYMBOLS 1 ... Digital broadcasting system, 10 ... Reception apparatus, 20 ... Transmission apparatus, 41 ... Broadcasting satellite, 101 ... Reception part, 103 ... Demodulation part, 104 ... Separation part, 105 ... Control part, 106 ... Memory | storage part, 107 ... Speech decoding 108: Audio switching unit, 109 ... Audio reproduction unit, 110 ... Video decoding unit, 111 ... Video synthesis unit, 112 ... Display unit, 113 ... Operation unit, 201 ... Program data generation unit, 202 ... Configuration information generation unit, 203 ... Multiplexing unit 204 ... Encryption unit 205 ... Transmission unit

Claims (6)

A receiving unit for receiving a broadcast wave including program data and configuration data including information about the program;
A comparison unit that determines whether the resolution of the video data included in the program data is a resolution that can be displayed on the display unit based on information indicating the resolution of the video included in the configuration data received by the reception unit. When,
When it is determined by the comparison unit that the resolution of the video data cannot be displayed on the display unit, it is determined whether or not there is a sub audio different from the main audio, and if there is the sub audio, the broadcast wave A voice switching unit that decodes only the voice and outputs the sub-voice of the decoded voice;
A notifying unit for notifying information indicating that the video data is received and the sub-audio is output when the comparison unit determines that the resolution of the video data cannot be displayed on the display unit;
A receiving device. The secondary audio is
The receiving apparatus according to claim 1, wherein the receiving apparatus is a commentary broadcast voice or a voice commentary for a visually impaired person. The secondary audio is
The receiving apparatus according to claim 1, wherein the receiving apparatus is voice selected by a user by operating an operation unit. The resolution that can be displayed on the display unit is 4096 or 3840 pixels in the horizontal resolution.
The voice switching unit
When the horizontal resolution of the video data is 7680 and the sub audio is present, the sub audio is switched to
The notification unit
The reception according to any one of claims 1 to 3, wherein when the horizontal resolution of the video data is 7680 and the sub-audio is present, information indicating that the video data is received is notified. apparatus. A receiving unit for receiving a broadcast wave including program data and configuration data including information on the program;
Whether the resolution of the video data included in the program data is a resolution that can be displayed on the display unit based on information indicating the resolution of the video included in the configuration data received by the reception procedure. A comparison procedure to determine
A determination procedure for determining whether or not there is a sub-audio different from the main audio when the audio switching unit determines that the resolution of the video data cannot be displayed on the display unit by the comparison procedure;
A decoding unit that decodes only audio from the broadcast wave when it is determined by the determination procedure that the sub-audio is present;
A voice switching procedure in which a voice switching unit outputs the sub voice out of the voice demodulated by the decoding procedure;
A notification procedure for notifying the information indicating that the video data is received and the sub audio is output when the notification unit determines that the resolution of the video data cannot be displayed on the display unit by the comparison procedure. When,
Including receiving method. In the computer of the receiving device,
A receiving procedure for receiving a broadcast wave including program data and configuration data including information about the program;
A comparison for determining whether or not the resolution of the video data included in the program data is a resolution that can be displayed on the display unit based on information indicating the resolution of the video included in the configuration data received by the reception procedure. Procedure and
A determination procedure for determining whether or not there is sub-audio different from the main audio when it is determined by the comparison procedure that the resolution of the video data cannot be displayed on the display unit;
A decoding procedure for decoding only the audio from the broadcast wave when it is determined by the determination procedure that the sub-audio is present;
An audio switching procedure for outputting the sub audio out of the audio decoded by the decoding procedure;
A notification procedure for notifying the information indicating that the video data is received and the secondary audio is output when it is determined that the resolution of the video data cannot be displayed on the display unit by the comparison procedure;
A program that executes

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