WO2023013124A1 - 再送出装置、再送出方法、受信装置、及び受信方法 - Google Patents
再送出装置、再送出方法、受信装置、及び受信方法 Download PDFInfo
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- WO2023013124A1 WO2023013124A1 PCT/JP2022/009032 JP2022009032W WO2023013124A1 WO 2023013124 A1 WO2023013124 A1 WO 2023013124A1 JP 2022009032 W JP2022009032 W JP 2022009032W WO 2023013124 A1 WO2023013124 A1 WO 2023013124A1
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- time information
- broadcasting system
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- 238000012545 processing Methods 0.000 claims abstract description 113
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/02—Arrangements for relaying broadcast information
- H04H20/06—Arrangements for relaying broadcast information among broadcast stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
- H04H60/38—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
- H04H60/40—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2362—Generation or processing of Service Information [SI]
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
- H04N21/64322—IP
Definitions
- the present disclosure relates to a retransmitting device, a retransmitting method, a receiving device, and a receiving method, and in particular, a retransmitting device, a retransmitting method, a receiving device, and a receiving method capable of more appropriately processing time information. Regarding.
- the present disclosure has been made in view of this situation, and is intended to enable time information to be processed more appropriately.
- a retransmission device includes a receiving unit that receives a broadcast signal of a first broadcasting system, and first time information transmitted in a physical layer defined by the first broadcasting system, the a conversion unit for converting into second time information in NTP format to be stored in a packet transmitted in an upper layer, which is a layer higher than the physical layer defined by a second broadcasting system different from the first broadcasting system; and a transmission unit for transmitting the broadcast signal of the second broadcast system.
- a retransmission device receives a broadcast signal of a first broadcasting system, and transmits first time information transmitted in a physical layer defined by the first broadcasting system. , converting into second time information in NTP format to be stored in a packet transmitted in a higher layer, which is a layer higher than the physical layer defined in a second broadcasting system different from the first broadcasting system, This is a retransmission method for transmitting the broadcast signal of the second broadcast system.
- the first time information transmitted in the physical layer defined by the first broadcasting system after receiving the broadcast signal of the first broadcasting system is converted into second time information in NTP format to be stored in a packet transmitted in a higher layer, which is a layer higher than the physical layer defined by a second broadcasting system different from the first broadcasting system.
- the broadcast signal of the second broadcast system is transmitted.
- a receiving device includes a receiving unit that receives and demodulates a broadcast signal of a first broadcasting system, and a processing unit that processes packets obtained by demodulating the broadcast signal, the receiving unit transmits the first time information transmitted in the physical layer defined by the first broadcasting system in a layer higher than the physical layer defined by the second broadcasting system different from the first broadcasting system It has a converting unit for converting into second time information in NTP format to be stored in a packet transmitted in a certain upper layer, and the processing unit stores the second time information output from the receiving unit.
- a receiving device that processes packets.
- a receiving method includes a receiving unit that receives and demodulates a broadcast signal of a first broadcasting system, and a processing unit that processes packets obtained by demodulating the broadcast signal.
- a method wherein the receiving unit receives first time information transmitted in a physical layer defined by the first broadcasting system, defined by a second broadcasting system different from the first broadcasting system The second time information is converted into second time information in NTP format to be stored in a packet transmitted in an upper layer, which is a layer higher than the physical layer, and the processing unit outputs the second time information from the receiving unit.
- a broadcast signal of the first broadcast format is received and demodulated, and packets obtained by demodulating the broadcast signal are processed. Further, the first time information transmitted in the physical layer defined by the first broadcasting system is transmitted in a layer higher than the physical layer defined by the second broadcasting system different from the first broadcasting system. The second time information is converted into second time information in NTP format to be stored in a packet transmitted in a certain upper layer, and the packet containing the second time information is processed.
- the retransmitting device and the receiving device may be independent devices, or may be internal blocks forming one device.
- FIG. 1 is a block diagram showing a configuration example of an embodiment of a transmission system to which the present disclosure is applied;
- FIG. FIG. 2 is a block diagram showing a configuration example of a transmission device in FIG. 1;
- FIG. 2 is a block diagram showing a configuration example of a resending device in FIG. 1;
- FIG. FIG. 2 is a block diagram showing a configuration example of a receiving device in FIG. 1;
- 1 is a diagram showing an example of a protocol stack for digital terrestrial television broadcasting;
- FIG. FIG. 4 is a diagram showing an example of a protocol stack at the time of retransmission by digital cable television broadcasting;
- FIG. 4 is a diagram showing an example of arrangement of NTP time information;
- FIG. 4 is a diagram showing an example of syntax of NTP time information;
- FIG. 4 is a diagram showing an example of conversion from physical layer time information to NTP time information;
- FIG. 4 is a diagram showing an example of a protocol stack of ATSC3.0;
- 2 is a flowchart for explaining the flow of processing of each device in the transmission system of FIG. 1;
- FIG. 11 is a block diagram showing another configuration example of an embodiment of a transmission system to which the present disclosure is applied;
- FIG. 13 is a block diagram showing a configuration example of the retransmission device of FIG. 12;
- FIG. 11 is a block diagram showing still another configuration example of an embodiment of a transmission system to which the present disclosure is applied;
- FIG. 1 is a block diagram showing a configuration example of an embodiment of a transmission system to which the present disclosure is applied.
- the transmission system is composed of a transmitting device 10, a retransmitting device 20, and a receiving device 30.
- the transmitting device 10 is a device that transmits content such as broadcast programs produced by terrestrial broadcasting stations.
- the transmission device 10 generates a broadcast stream, performs necessary processing, and transmits the resulting digital terrestrial television broadcast signal from a transmission antenna installed at a transmission station.
- the retransmitting device 20 is a headend device installed in a cable television station or the like.
- the retransmitting device 20 performs necessary processing on the digital terrestrial television broadcast signal received via the antenna, and transmits the resultant digital cable television broadcast signal to the cable television transmission network.
- the receiving device 30 is a fixed receiver such as a television receiver, a set top box (STB: Set Top Box), a recorder, a game machine, or a network storage.
- the receiving device 30 is connected to the cable television transmission network by a cable such as an optical fiber cable or a coaxial cable.
- the receiving device 30 receives the broadcast signal of the digital cable television broadcast transmitted from the retransmitting device 20 via the cable television transmission network.
- the receiving device 30 outputs video and audio of contents such as broadcast programs by processing broadcast streams obtained from broadcast signals. This allows the user to view content such as broadcast programs.
- the broadcast signal of digital terrestrial television broadcasting is also referred to as a terrestrial broadcast signal.
- Broadcast signals of digital cable television broadcasting are also referred to as cable broadcasting signals.
- FIG. 2 is a block diagram showing a configuration example of the transmission device 10 of FIG.
- the transmission device 10 is composed of a generation section 101 and a transmission section 102 .
- the generation unit 101 generates a broadcast stream based on the data input there, and supplies it to the transmission unit 102 .
- a broadcast stream includes broadcast components that make up contents such as broadcast programs and commercials produced by terrestrial broadcasting stations, control information related to the broadcast components, and time information.
- Broadcast components include components such as video streams, audio streams, and subtitle streams.
- the transmitting section 102 Based on the broadcast stream supplied from the generating section 101, the transmitting section 102 generates a physical layer frame conforming to the broadcasting system of digital terrestrial television broadcasting.
- the transmission unit 102 performs necessary processing such as modulation processing on the physical layer frame, and transmits it as a terrestrial broadcast signal.
- a terrestrial broadcasting signal is transmitted from a transmitting antenna installed at a transmitting station.
- the physical layer frame contains control information such as transmission multiplexing control information.
- control information transmitted in the physical layer is also called physical layer control information.
- control information transmitted in a higher layer for example, transport layer
- transport layer which is a layer higher than the physical layer
- higher layer control information for example, the control information related to the broadcast component is higher layer control information.
- FIG. 3 is a block diagram showing a configuration example of the resending device 20 of FIG.
- the resending device 20 is composed of a receiving section 201, a processing section 202, and a transmitting section 203.
- the receiving unit 201 receives the terrestrial broadcast signal transmitted from the transmitting device 10 via the antenna, performs necessary processing, and supplies the signal to the processing unit 202 .
- the processing unit 202 performs processing corresponding to the transmodulation method on the signal supplied from the receiving unit 201 and supplies the resulting signal to the transmitting unit 203 .
- the transmodulation method is a method in which the retransmitting device 20 of the cable television station changes the modulation method of the received broadcast signal and retransmits it.
- the processing unit 202 has a conversion unit 211 .
- the conversion unit 211 stores the time information transmitted in the physical layer defined by the broadcasting system of digital terrestrial television broadcasting in a packet transmitted in the upper layer defined by the broadcasting system of digital cable television broadcasting. Convert to time information in NTP (Network Time Protocol) format.
- NTP Network Time Protocol
- the physical layer frame contains time information.
- the time information may be included in the physical layer control information, or may be transmitted separately from the physical layer control information.
- time information transmitted in the physical layer is also called physical layer time information.
- NTP-format time information stored in a packet (eg, IP/UDP packet) transmitted in a higher layer (eg, transport layer), which is a layer higher than the physical layer is also referred to as NTP time information.
- the transmission unit 203 transmits a cable broadcast signal based on the signal supplied from the processing unit 202. Cable broadcast signals are transmitted over cable television transmission networks.
- FIG. 4 is a block diagram showing a configuration example of the receiving device 30 of FIG.
- the receiving device 30 is composed of a receiving section 301 and a processing section 302 .
- the receiving section 301 is composed of a tuner, a demodulation LSI (Large Scale Integration), and the like.
- the receiving unit 301 performs necessary processing such as demodulation processing on the cable broadcast signal received via the cable television transmission network, and supplies packets storing data of the resulting broadcast stream to the processing unit 302 .
- the processing unit 302 is composed of a main SoC (System On Chip) and the like.
- the processing unit 302 performs necessary processing such as decoding processing and reproduction processing on the packets supplied from the receiving unit 301 .
- a broadcast stream contains broadcast components and higher layer control information.
- the data of the broadcast component is decoded and reproduced based on the upper layer control information.
- Data such as video and audio obtained by processing such as decoding processing and playback processing is output to the subsequent circuit.
- the image of the content such as the broadcast program is displayed on the display, and the sound synchronized with the image is output from the speaker.
- the broadcast stream generated by the transmission device 10 is retransmitted by the retransmission device 20, received by the reception device 30 via the cable television transmission network, and processed. By doing so, content such as broadcast programs can be viewed.
- the transmission device 10 has the generation unit 101 and the transmission unit 102, but the generation unit 101 and the transmission unit 102 may be provided in separate devices. That is, it may be configured as a transmission system including an apparatus having the generating section 101 and an apparatus having the transmitting section 102 .
- the retransmitting device 20 has the receiving unit 201, the processing unit 202, and the transmitting unit 203. may be Furthermore, in the configuration described above, the case where there is one receiver 30 is illustrated, but in reality, a plurality of receivers 30 are provided, each of which is connected to the cable television transmission network.
- ISDB-T Integrated Services Digital Broadcasting-Terrestrial
- TMCC Transmission Multiplexing Configuration Control
- LLch Low Latency Channel
- FIG. 5 is a diagram showing an example of a protocol stack for next-generation digital terrestrial television broadcasting.
- terrestrial broadcasting which is the lowest layer, corresponds to the physical layer, and TMCC and LLch are transmitted as physical layer control information.
- TMCC is transmission multiplex control information.
- LLch carries additional information about broadcasting.
- physical layer time information is transmitted.
- IP Internet Protocol
- TLV Type Length Value
- IP/UDP packets are IP packets including UDP (User Datagram Protocol) packets.
- UDP User Datagram Protocol
- a TLV packet is a variable length packet.
- MMT MPEG Media Transport
- the MMT method is a method for transmitting multimedia content using various networks such as broadcasting and communication.
- data such as video, audio, subtitles, control information, applications, etc. are placed on MMTP (MMT Protocol) payloads in a predetermined format, converted into MMTP packets, and stored in IP/UDP packets. IP/UDP packets are then stored in TLV packets and encapsulated, and the resulting broadcast stream is transmitted as a terrestrial broadcast signal.
- MMT Protocol MMT Protocol
- MMT-SI (Signaling Information) is control information including the configuration of broadcast programs.
- MMT-SI is upper layer control information transmitted in the transport layer, which is an upper layer. Data such as time information and content can be stored and transmitted in IP/UDP packets.
- the time information is information about the time specified in NTP format. Note that the MMT method is specified in Document A below, for example.
- the conversion unit 211 of the processing unit 202 converts the physical layer time information transmitted in the physical layer specified by the broadcasting system of digital terrestrial television broadcasting into a digital cable.
- the time information can be appropriately processed and transmitted.
- the receiving device 30 that receives the digital cable television broadcasting can easily receive the NTP time information obtained by converting the physical layer time information transmitted in the physical layer specified by the broadcasting system of the digital terrestrial television broadcasting. It is possible to perform processing based on the NTP time information.
- the retransmitting device 20 converts the physical layer time information from the transmitting device 10 into NTP time information, and a TLV packet containing an IP/UDP packet containing the NTP time information is sent to the receiving device 30. to be sent.
- FIG. 6 is a diagram showing an example of a protocol stack at the time of retransmission by digital cable television broadcasting.
- the protocol stack in FIG. 6 differs from the protocol stack in FIG. 5 in the following points. That is, in the protocol stack of FIG. 6, the broadcasting corresponding to the physical layer represents not digital terrestrial television broadcasting (terrestrial broadcasting) but digital cable television broadcasting (cable broadcasting). When retransmitting by digital cable television broadcasting, if the transmodulation method is adopted, there is no appropriate path for transmitting the physical layer time information, so the physical layer control information including the physical layer time information is not shown.
- time information is transmitted in the upper layer, the transport layer, as indicated by the area surrounded by the thick line frame in the figure.
- Packets transmitted in the transport layer include IP/UDP packets and TLV packets.
- the NTP time information can be stored in IP/UDP packets.
- the IP/UDP packet storing the NTP time information can be stored in a TLV packet.
- physical layer time information can be converted into IP/UDP packets containing NTP time information.
- physical layer time information can be converted into TLV packets containing IP/UDP packets storing NTP time information.
- FIG. 7 shows an example of arrangement of NTP time information. In FIG. 7, an NTP packet containing NTP time information is stored in the payload of the IP/UDP packet.
- FIG. 8 is a diagram showing an example of the syntax of NTP time information.
- a 2-bit leap_indicator indicates that a leap second will be inserted or deleted in the last minute of the current month.
- a 3-bit version indicates the NTP version.
- 3-bit mode indicates the NTP operation mode.
- the 8-bit stratum indicates the hierarchy and is encoded according to the hierarchy.
- 8-bit poll indicates the polling interval according to the maximum interval of consecutive NTP messages.
- 8-bit precision indicates the precision of the system clock.
- 32-bit root_delay indicates the round-trip delay to the reference time in NTP short format.
- the 32-bit root_dispersion indicates the dispersion of the total delay to the reference time in NTP short form.
- a 32-bit reference_identification indicates an identifier representing a reference time.
- the 64-bit reference_timestamp indicates the time when the system time was last corrected in NTP long format.
- the 64-bit origin_timestamp indicates the client's time when the request was sent from the client to the server in NTP long format.
- the 64-bit receive_timestamp indicates the time of the server that received the request from the client in NTP long format.
- the 64-bit transmit_timestamp indicates the time the server sent the response to the client in NTP long format.
- the conversion unit 211 of the processing unit 202 converts the physical layer time information from the transmission device 10 into NTP time information having the NTP format structure shown in FIG.
- FIG. 9 is a diagram showing an example of conversion from physical layer time information to NTP time information.
- FIG. 9 shows how the physical layer time information is converted corresponding to the NTP format shown in FIG.
- Leap_indicator contains leap second control information related to leap second control included in the physical layer time information transmitted in the physical layer defined by the digital terrestrial television broadcasting system.
- a fixed value of '4' is stored in version for broadcasting systems such as digital cable television broadcasting.
- Mode stores a fixed value of '5' in the broadcasting system.
- An operating mode of '5' means broadcast.
- a fixed value of '0' is stored in stratum in the broadcasting system.
- a fixed value of '0' is stored in poll in a broadcasting system.
- a fixed value of '0' is stored in precision in a broadcasting system.
- Root_delay stores a fixed value of '0' in the broadcasting system.
- a fixed value of '0' is stored in root_dispersion in the broadcasting system.
- NULL (0000) is stored in reference_identification.
- reference_timestamp stores a fixed value of '0' in the broadcasting system.
- a fixed value of '0' is stored in origin_timestamp in the broadcasting system.
- a fixed value of '0' is stored in receive_timestamp in a broadcasting system.
- NTP format time information corresponding to the physical layer time information transmitted in the physical layer specified by the digital terrestrial television broadcasting system is placed.
- the format of the physical layer time information is not particularly limited, but since the amount of information that can be transmitted on the physical layer is limited, a predetermined format can be used according to the amount of information that can be transmitted.
- physical layer time information can be converted into NTP time information by inserting a predetermined fixed value in addition to specific information including leap_indicator and transmit_timestamp. Even if the information other than the specific information is set to a fixed value, the receiver 30 can operate normally because it contains the information necessary as the time information used in the processing in the receiver 30 .
- the conversion unit 211 can convert the physical layer time information into NTP time information.
- the conversion unit 211 converts the minimum necessary information transmitted as physical layer time information into NTP time information so that the NTP format can be transmitted in the upper layer.
- Time information can be transmitted.
- the physical layer time information consists of leap second control information corresponding to a 2-bit leap_indicator and time information in a predetermined format corresponding to a 64-bit transmit_timestamp as the minimum necessary information (specific information). A total of 66 bits of information is transmitted.
- the transmit_timestamp is defined as 64 bits, but if the clock accuracy is sufficient, some of the 64 bits may be used. In other words, the number of significant digits of the time information does not have to use 64 bits, and the number of bits of transmit_timestamp may be reduced and defined as less than 64 bits, such as 48 bits.
- the retransmitting device 20 converts the physical layer time information transmitted by the physical layer from the transmitting device 10 into TLV packets containing IP/UDP packets containing NTP time information, and transmits the TLV packets by the upper layer. be able to.
- the receiving device 30 can receive the NTP time information transmitted in the upper layer from the retransmitting device 20 and process it appropriately.
- TLV packets are used as packets for transmission when retransmitting broadcast programs broadcasted by next-generation terrestrial digital television broadcasting by digital cable television broadcasting. explained the configuration.
- ALP ATSC Link -layer Protocol
- Fig. 10 is a diagram showing an example of an ATSC3.0 protocol stack.
- broadcasting and communication correspond to the physical layer, and both broadcasting and communication transmission paths are supported.
- ROUTE Real-Time Object Delivery over Unidirectional Transport
- MMT Mobility Management Entity
- data such as video, audio, and subtitles are processed as DASH segments stipulated by MPEG-DASH (Dynamic Adaptive Streaming over HTTP) and stored in IP/UDP packets, which are IP packets including UDP packets. . Then, the IP/UDP packets are stored and encapsulated in ALP packets, which are packets for transmission, and the resulting broadcast stream is transmitted as a broadcast signal.
- MPEG-DASH Dynamic Adaptive Streaming over HTTP
- packets transmitted in the upper transport layer include IP/UDP packets and ALP packets.
- the NTP time information can be stored in an IP/UDP packet.
- the IP/UDP packet storing the NTP time information can be stored in the ALP packet.
- physical layer time information can be converted into IP/UDP packets containing NTP time information.
- physical layer time information can be converted into ALP packets containing IP/UDP packets storing NTP time information.
- ALP packets are defined in Document B below, for example.
- GSE Generic Stream Encapsulation
- step S11 the generation unit 101 generates physical layer time information.
- step S12 the transmission unit 102 generates a physical layer frame conforming to the broadcasting system of digital terrestrial television broadcasting.
- This physical layer frame contains physical layer time information.
- step S13 the transmission unit 102 transmits the physical layer frame as a terrestrial broadcast signal from the transmission antenna installed at the transmission station.
- step S21 the receiving unit 201 receives the terrestrial broadcasting signal transmitted from the transmitting device 10 via the antenna.
- step S22 the conversion unit 211 converts the physical layer time information transmitted in the physical layer specified by the broadcasting method of digital terrestrial television broadcasting using the first method described above, for example, to the time information of digital cable television broadcasting. Convert to NTP time information to be transmitted in the upper layer specified by the broadcasting system. NTP time information is stored in IP/UDP packets. IP/UDP packets containing NTP time information are stored in TLV packets.
- step S23 the processing unit 202 performs processing corresponding to the transmodulation method.
- the transmission unit 203 transmits the cable broadcast signal to the cable television transmission network.
- This cable broadcast signal contains NTP time information transmitted in the upper layer.
- step S31 the receiver 301 receives a cable broadcast signal via the cable television transmission network.
- step S32 the receiving unit 301 performs necessary processing such as demodulation processing on the received cable broadcast signal, and outputs a TLV packet containing the resulting NTP time information.
- step S33 the processing unit 302 performs predetermined processing based on the NTP time information output from the receiving unit 301.
- This NTP time information is time information in NTP format obtained by converting the physical layer time information transmitted in the physical layer defined by the broadcasting system of digital terrestrial television broadcasting.
- the processing unit 302 processes the broadcast stream, and decodes and reproduces the data of the broadcast component based on the upper layer control information.
- the retransmitting device 20 transmits the physical layer time information transmitted in the physical layer specified by the broadcasting system of digital terrestrial television broadcasting to the upper layer specified by the broadcasting system of digital cable television broadcasting.
- the receiving device 30 can appropriately process the time information.
- FIG. 12 is a block diagram showing another configuration example of one embodiment of the transmission system to which the present disclosure is applied.
- the transmission system is composed of a transmitting device 10, a retransmitting device 20A, a receiving device 30, and a server 40.
- the transmission device 10 generates a broadcast stream, performs necessary processing, and transmits the resulting terrestrial broadcast signal from a transmission antenna installed at a transmission station.
- the server 40 is a distribution server that distributes content and the like in response to requests from devices connected to a network such as the Internet.
- the server 40 generates a communication stream, performs necessary processing, and transmits the resulting communication signal to the resending device 20A via a network such as the Internet.
- a communication stream includes communication components that make up contents such as programs, control information related to the communication components, and time information.
- Communication components include components such as video streams, audio streams, and subtitle streams.
- the retransmission device 20A performs necessary processing on the terrestrial broadcast signal received via the antenna, and transmits the resulting cable broadcast signal (RF signal) to the cable television transmission network. Also, the resending device 20A receives a communication signal transmitted from the server 40 via a network such as the Internet. The retransmitting device 20A performs necessary processing on the communication signal received from the server 40, and transmits the resulting cable broadcast signal (IP signal) to the cable television transmission network.
- RF signal cable broadcast signal
- the receiving device 30 is a fixed receiver such as a television receiver.
- the receiving device 30 receives a cable broadcast signal (RF signal, IP signal) transmitted from the retransmitting device 20A via the cable television transmission network.
- the receiving device 30 outputs video and audio of content such as broadcast programs by processing at least one of a broadcast stream and a communication stream obtained from cable broadcast signals (RF signals, IP signals). This allows the user to view content such as broadcast programs.
- FIG. 13 is a block diagram showing a configuration example of the resending device 20A of FIG.
- the retransmitting device 20A is composed of a receiving section 201, a transmitting section 203, a converting section 211, a buffer 221, a communicating section 231, a comparing section 232, a buffer 233, and a transmitting section 234.
- Conversion unit 211 , buffer 221 , comparison unit 232 and buffer 233 are included in processing unit 202 .
- the receiving unit 201 receives terrestrial broadcast signals transmitted from the transmitting device 10 via an antenna.
- the processing unit 202 performs necessary processing on the signal output from the receiving unit 201 and stores broadcast component data obtained as a result in the buffer 221 .
- the conversion unit 211 converts the physical layer time information transmitted in the physical layer defined by the broadcasting system of digital terrestrial television broadcasting into NTP time information, and supplies the NTP time information to the comparison unit 232 .
- the communication unit 231 receives communication signals transmitted from the server 40 via a network such as the Internet and performs necessary processing.
- the processing unit 202 performs necessary processing on the signal output from the communication unit 231 and stores communication component data obtained as a result in the buffer 233 .
- the processing unit 202 also acquires time information in NTP format included in the communication stream and supplies it to the comparison unit 232 .
- the comparison unit 232 is supplied with the NTP time information from the conversion unit 211 and the NTP format time information acquired via communication.
- the comparison unit 232 compares NTP time information with time information in NTP format acquired via communication.
- the processing unit 202 adjusts the delay occurring between the broadcast component data stored in the buffer 221 and the communication component data stored in the buffer 233 based on the comparison result by the comparison unit 232 .
- the broadcast component data stored in the buffer 221 and the communication component data stored in the buffer 233 are output to the transmitting unit 203 and the transmitting unit 234 at appropriate timings.
- the transmission unit 203 performs necessary processing on the broadcast component data output from the buffer 221, and transmits the resulting cable broadcast signal (RF signal) to the cable television transmission network.
- the transmission unit 234 performs necessary processing on the communication component data output from the buffer 233, and transmits the resulting cable broadcast signal (IP signal) to the cable television transmission network.
- the receiving device 30 receives the cable broadcast signal (RF signal, IP signal) transmitted from the retransmitting device 20A via the cable television transmission network and performs necessary processing to reproduce the image of content such as a broadcast program. and output audio.
- a service may be provided by combining a broadcast component transmitted via broadcasting and a communication component transmitted via communication. delays between components can be adjusted and synchronized.
- the retransmitting device 20A converts the NTP time information from the physical layer time information transmitted in the physical layer specified by the broadcasting system of digital terrestrial television broadcasting, and the NTP format acquired via communication. Time information is compared, and based on the comparison result, the delay between the broadcast signal (RF signal) obtained via broadcasting and the communication signal (IP signal) obtained via communication can be adjusted. In this way, by adjusting the signal delay on the retransmitting device 20A side, the receiving device 30 side can output a synchronized signal without adjusting the signal delay.
- RF signal broadcast signal
- IP signal communication signal
- FIG. 14 is a block diagram showing still another configuration example of one embodiment of the transmission system to which the present disclosure is applied.
- the transmission system is composed of a transmitting device 10 and a receiving device 30A.
- the transmission device 10 generates a broadcast stream, performs necessary processing, and transmits the resulting terrestrial broadcast signal from a transmission antenna installed at a transmission station.
- the receiving device 30A is a fixed receiver such as a television receiver.
- the receiving device 30A receives a terrestrial broadcast signal transmitted from the transmitting device 10 via an antenna.
- the receiving device 30A outputs video and audio of contents such as broadcast programs by processing broadcast streams obtained from terrestrial broadcast signals. This allows the user to view content such as broadcast programs.
- FIG. 15 is a block diagram showing a configuration example of the receiver 30A of FIG.
- the receiving device 30A is composed of a receiving section 301A and a processing section 302.
- the receiver 301A has a converter 311 .
- the receiving section 301A is composed of a tuner, a demodulation LSI, and the like.
- the receiving unit 301A performs necessary processing such as demodulation processing on the terrestrial broadcast signal received from the transmitting device 10 via the antenna, and supplies packets containing data of the resulting broadcast stream to the processing unit 302. do.
- the conversion unit 311 is included in a demodulation device such as a demodulation LSI.
- the conversion unit 311 converts the physical layer time information transmitted in the physical layer defined by the broadcasting system of digital terrestrial television broadcasting into NTP time information transmitted in a higher layer such as a transport layer. This NTP time information is stored in IP/UDP packets. IP/UDP packets containing NTP time information are stored in TLV packets. A TLV packet containing NTP time information is output to the processing unit 302 .
- the processing unit 302 is composed of the main SoC and the like.
- the processing unit 302 performs necessary processing such as decoding processing and reproduction processing on the packets supplied from the receiving unit 301A.
- Data such as video and audio obtained by processing such as decoding processing and reproduction processing is output to subsequent circuits.
- the receiving device 30A the image of the content such as the broadcast program is displayed on the display, and the sound synchronized with the image is output from the speaker.
- the processing unit 302 performs predetermined processing based on the NTP time information stored in the TLV packet supplied from the receiving unit 301A.
- This NTP time information is time information in NTP format obtained by converting the physical layer time information transmitted in the physical layer defined by the broadcasting system of digital terrestrial television broadcasting.
- the conversion unit 311 of the receiving unit 301A converts the physical layer specified by the broadcasting system of digital terrestrial television broadcasting transmitted from the transmitting device 10 is converted into NTP time information to be transmitted in a higher layer such as a transport layer, and a packet containing the NTP time information is output to the subsequent processing unit 302 .
- the receiving device 30A does not increase the number of output signals of the demodulation device having the conversion unit 311, and the physical layer transmitted in the physical layer stipulated by the broadcasting system of digital terrestrial television broadcasting.
- NTP time information obtained by converting layer time information can be multiplexed with data and output.
- the processing unit 302 comprising the main SoC can process the NTP time information output from the receiving unit 301A including the demodulation device at appropriate timing.
- steps S111 to S113 executed by the transmitting device 10 will be described.
- steps S111 to S113 as in steps S11 to S13 in FIG. 11, a physical layer frame including physical layer time information is transmitted as a terrestrial broadcasting signal from a transmitting antenna installed at a transmitting station.
- step S131 the receiving unit 301A receives the terrestrial broadcasting signal transmitted from the transmitting device 10 via the antenna.
- step S132 the conversion unit 311 converts the physical layer time information transmitted in the physical layer specified by the broadcasting method of digital terrestrial television broadcasting using, for example, the first method or the second method described above. Convert to NTP time information to be transmitted in higher layers such as the port layer.
- step S133 the receiver 301A outputs a TLV packet containing NTP time information.
- step S134 the processing unit 302 performs predetermined processing based on the NTP time information output from the receiving unit 301.
- This NTP time information is time information in NTP format obtained by converting the physical layer time information transmitted in the physical layer defined by the broadcasting system of digital terrestrial television broadcasting.
- the processing unit 302 processes the broadcast stream, and decodes and reproduces the data of the broadcast component based on the upper layer control information.
- the conversion unit 311 converts the physical layer time information transmitted in the physical layer specified by the broadcasting system of digital terrestrial television broadcasting to an NTP that transmits in an upper layer such as a transport layer.
- the processing unit 302 can appropriately process the time information.
- the receiving device 30 or the receiving device 30A is exemplified by a device capable of receiving broadcast signals, such as a television receiver and a set-top box. It may have a communication function to perform communication via the. In this case, the receiving device 30 performs two-way communication with the server via a communication line such as the Internet.
- the receiving device 30 or the receiving device 30A is a fixed receiver such as a television receiver or a set-top box. It may be a mobile receiver such as a model computer, or a vehicle-mounted receiver such as a vehicle-mounted television.
- the term "system” refers to a logical assembly of a plurality of devices.
- a TLV packet may be called an ALP packet, a GSE packet, or the like.
- the difference in these names is a formal difference, not a difference in substance such as target descriptors.
- FIG. 17 is a block diagram showing a configuration example of hardware of a computer that executes the series of processes described above by a program.
- a CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- An input/output interface 1005 is further connected to the bus 1004 .
- An input unit 1006 , an output unit 1007 , a storage unit 1008 , a communication unit 1009 and a drive 1010 are connected to the input/output interface 1005 .
- the input unit 1006 consists of a keyboard, mouse, microphone, and the like.
- the output unit 1007 includes a display, a speaker, and the like.
- the storage unit 1008 includes a hard disk, nonvolatile memory, and the like.
- a communication unit 1009 includes a network interface and the like.
- a drive 1010 drives a removable recording medium 1011 such as a semiconductor memory, magnetic disk, optical disk, or magneto-optical disk.
- the CPU 1001 loads a program recorded in the ROM 1002 or the storage unit 1008 into the RAM 1003 via the input/output interface 1005 and the bus 1004 and executes the above-described series of programs. is processed.
- a program executed by the computer (CPU 1001) can be provided by being recorded on a removable recording medium 1011 such as a package medium, for example. Also, the program can be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.
- the program can be installed in the storage section 1008 via the input/output interface 1005 by loading the removable recording medium 1011 into the drive 1010 . Also, the program can be received by the communication unit 1009 and installed in the storage unit 1008 via a wired or wireless transmission medium. In addition, programs can be installed in the ROM 1002 and the storage unit 1008 in advance.
- processing performed by the computer according to the program does not necessarily have to be performed in chronological order according to the order described as the flowchart.
- processing performed by a computer according to a program includes processing that is executed in parallel or individually (for example, parallel processing or processing by objects).
- the program may be processed by one computer (processor) or may be processed by a plurality of computers in a distributed manner.
- the present disclosure can be configured as follows.
- a receiving unit that receives a broadcast signal of the first broadcast format
- the first time information transmitted in the physical layer defined by the first broadcasting system is an upper layer that is higher than the physical layer defined by the second broadcasting system different from the first broadcasting system.
- a conversion unit that converts to second time information in NTP format that is stored in a packet that is transmitted in the layer;
- a retransmitting device comprising: a transmitting unit that transmits a broadcast signal of the second broadcasting system.
- the upper layer is a transport layer;
- the first time information includes specific information about time
- the retransmission device according to (2) wherein the conversion unit converts the first time information into the second time information including the specific information and a predetermined fixed value.
- the first broadcasting system is a broadcasting system for terrestrial digital television broadcasting
- the second broadcasting system is a broadcasting system conforming to ATSC 3.0, The retransmission device according to any one of (2) to (4), wherein the conversion unit converts the first time information into an ALP packet including an IP/UDP packet storing the second time information. .
- a communication unit that communicates with a server via a network; further comprising a comparison unit that compares the second time information with time information in NTP format obtained via communication, Retransmission according to any one of the above (1) to (7), wherein the delay between the broadcast signal of the second broadcast format and the communication signal obtained via communication is adjusted based on the comparison result by the comparison unit. output device.
- the retransmitting device receiving a broadcast signal of the first broadcast system;
- the first time information transmitted in the physical layer defined by the first broadcasting system is an upper layer that is higher than the physical layer defined by the second broadcasting system different from the first broadcasting system. Converting to second time information in NTP format stored in packets transmitted at the layer, A retransmitting method of transmitting a broadcast signal of the second broadcasting system.
- a receiver that receives and demodulates a broadcast signal of the first broadcast format; a processing unit that processes packets obtained by demodulating the broadcast signal, The receiving unit transmits the first time information transmitted in the physical layer defined by the first broadcasting system higher than the physical layer defined by the second broadcasting system different from the first broadcasting system.
- the processing unit processes a packet storing the second time information output from the receiving unit.
- the upper layer is a transport layer;
- the receiving device according to (10), wherein the packet is an IP/UDP packet.
- the first time information includes specific information about time,
- the receiving device according to (11), wherein the conversion unit converts the first time information into the second time information including the specific information and a predetermined fixed value.
- the receiving device according to (12), wherein the specific information includes at least control information regarding leap second control and time information in a predetermined format.
- the first broadcasting system is a broadcasting system for terrestrial digital television broadcasting
- the receiving device according to any one of (11) to (13), wherein the second broadcasting system is a broadcasting system for digital cable television broadcasting.
- the conversion unit converts the first time information into a TLV packet including an IP/UDP packet storing the second time information.
- the second broadcasting system is a broadcasting system conforming to ATSC 3.0, The receiving device according to any one of (11) to (13), wherein the conversion unit converts the first time information into ALP packets including IP/UDP packets storing the second time information.
- the receiving apparatus according to any one of (10) to (16), wherein the conversion section is included in a demodulation device.
- a receiving method for a receiving device comprising: a processing unit that processes packets obtained by demodulating the broadcast signal, The receiving unit transfers the first time information transmitted in the physical layer defined by the first broadcasting system to a higher layer than the physical layer defined by the second broadcasting system different from the first broadcasting system. Convert to the second time information in NTP format stored in the packet transmitted in the upper layer, which is the layer of The receiving method, wherein the processing unit processes a packet storing the second time information output from the receiving unit.
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Abstract
Description
図1は、本開示を適用した伝送システムの一実施の形態の構成例を示すブロック図である。
図2は、図1の送信装置10の構成例を示すブロック図である。
図3は、図1の再送出装置20の構成例を示すブロック図である。
図4は、図1の受信装置30の構成例を示すブロック図である。
日本では、地上デジタルテレビジョン放送の放送方式として、ISDB-T(Integrated Services Digital Broadcasting - Terrestrial)が採用されているが、地上デジタルテレビジョン放送の次世代方式の検討が行われている。次世代方式の地上デジタルテレビジョン放送では、放送ストリームとともに、TMCC(Transmission Multiplexing Configuration Control)やLLch(Low Latency Channel)を用いた複数の経路により制御情報が伝送される。
第1の方式においては、再送出装置20によって、送信装置10からの物理層時刻情報がNTP時刻情報に変換され、当該NTP時刻情報を格納したIP/UDPパケットを含むTLVパケットが受信装置30に送信されるようにする。
上述した第1の方式では、次世代方式の地上デジタルテレビジョン放送で放送された放送番組を、デジタル有線テレビジョン放送により再送信する運用を行う際に、伝送用のパケットとしてTLVパケットを用いた構成を説明した。それに対して、第2の方式では、再送信の運用を行うに際して、ATSC3.0(Advanced Television Systems Committee 3.0)である放送方式に対応した運用を行う場合に、伝送用のパケットとしてALP(ATSC Link-layer Protocol)パケットを用いた構成について説明する。
次に、図11のフローチャートを参照して、図1の伝送システムにおける各装置の処理の流れを説明する。ここでは、地上デジタルテレビジョン放送で放送された放送番組を、デジタル有線テレビジョン放送により再送信する運用を例にして説明する。
図12は、本開示を適用した伝送システムの一実施の形態の他の構成例を示すブロック図である。
図13は、図12の再送出装置20Aの構成例を示すブロック図である。
図14は、本開示を適用した伝送システムの一実施の形態のさらに他の構成例を示すブロック図である。
図15は、図14の受信装置30Aの構成例を示すブロック図である。
次に、図16のフローチャートを参照して、図14の伝送システムにおける各装置の処理の流れを説明する。
上述した説明では、次世代方式の地上デジタルテレビジョン放送で放送された放送番組等のコンテンツを、デジタル有線テレビジョン放送により再送信する運用を中心に説明したが、他の放送方式の組み合わせに適用してもよい。例えば、放送衛星(BS:Broadcasting Satellite)や通信衛星(CS:Communications Satellite)等を利用した衛星デジタル放送などの放送方式を適用可能である。また、デジタル放送の放送方式としては、ISDBに限らず、DVBやATSC等で規定された放送方式を組み合わせに用いても構わない。
上述した説明では、受信装置30又は受信装置30Aとして、テレビ受像機やセットトップボックスなどの放送信号を受信可能な機器を例示したが、例えば、インターネットや電話網等の通信回線(通信網)などを介した通信を実施する通信機能を有していても構わない。この場合において、受信装置30は、インターネット等の通信回線を介してサーバとの間で、双方向の通信を実施することになる。
上述した記述子やフィールド、パケット、ストリームなどの名称として、他の名称が用いられてもよい。例えば、TLVパケットは、ALPパケットやGSEパケットなどと称される場合がある。これらの名称の違いは、形式的な違いであって、対象の記述子などの実質的な内容が異なるものではない。
上述した一連の処理は、ハードウェアにより実行することもできるし、ソフトウェアにより実行することもできる。一連の処理をソフトウェアにより実行する場合には、そのソフトウェアを構成するプログラムが、コンピュータにインストールされる。図17は、上述した一連の処理をプログラムにより実行するコンピュータのハードウェアの構成例を示すブロック図である。
第1の放送方式の放送信号を受信する受信部と、
前記第1の放送方式で規定された物理層で伝送された第1の時刻情報を、前記第1の放送方式と異なる第2の放送方式で規定された物理層よりも上位の層である上位層で伝送されるパケットに格納されるNTP形式の第2の時刻情報に変換する変換部と、
前記第2の放送方式の放送信号を送信する送信部と
を備える再送出装置。
(2)
前記上位層は、トランスポート層であり、
前記パケットは、IP/UDPパケットである
前記(1)に記載の再送出装置。
(3)
前記第1の時刻情報は、時刻に関する特定の情報を含み、
前記変換部は、前記第1の時刻情報を、前記特定の情報と所定の固定値を含む前記第2の時刻情報に変換する
前記(2)に記載の再送出装置。
(4)
前記特定の情報は、閏秒の制御に関する制御情報、及び所定の形式の時刻情報を少なくとも含む
前記(3)に記載の再送出装置。
(5)
前記第1の放送方式は、地上デジタルテレビジョン放送の放送方式であり、
前記第2の放送方式は、デジタル有線テレビジョン放送の放送方式である
前記(2)乃至(4)のいずれかに記載の再送出装置。
(6)
前記変換部は、前記第1の時刻情報を、前記第2の時刻情報を格納したIP/UDPパケットを含むTLVパケットに変換する
前記(5)に記載の再送出装置。
(7)
前記第2の放送方式は、ATSC3.0に準拠した放送方式であり、
前記変換部は、前記第1の時刻情報を、前記第2の時刻情報を格納したIP/UDPパケットを含むALPパケットに変換する
前記(2)乃至(4)のいずれかに記載の再送出装置。
(8)
ネットワークを介してサーバとの間で通信を行う通信部と、
前記第2の時刻情報と、通信経由で取得されたNTP形式の時刻情報とを比較する比較部と
をさらに備え、
前記比較部による比較結果に基づいて、前記第2の放送方式の放送信号と、通信経由で取得された通信信号との遅延を調整する
前記(1)乃至(7)のいずれかに記載の再送出装置。
(9)
再送出装置が、
第1の放送方式の放送信号を受信し、
前記第1の放送方式で規定された物理層で伝送された第1の時刻情報を、前記第1の放送方式と異なる第2の放送方式で規定された物理層よりも上位の層である上位層で伝送されるパケットに格納されるNTP形式の第2の時刻情報に変換し、
前記第2の放送方式の放送信号を送信する
再送出方法。
(10)
第1の放送方式の放送信号を受信して復調する受信部と、
前記放送信号を復調して得られるパケットを処理する処理部と
を備え、
前記受信部は、前記第1の放送方式で規定された物理層で伝送された第1の時刻情報を、前記第1の放送方式と異なる第2の放送方式で規定された物理層よりも上位の層である上位層で伝送されるパケットに格納されるNTP形式の第2の時刻情報に変換する変換部を有し、
前記処理部は、前記受信部から出力される前記第2の時刻情報を格納したパケットを処理する
受信装置。
(11)
前記上位層は、トランスポート層であり、
前記パケットは、IP/UDPパケットである
前記(10)に記載の受信装置。
(12)
前記第1の時刻情報は、時刻に関する特定の情報を含み、
前記変換部は、前記第1の時刻情報を、前記特定の情報と所定の固定値を含む前記第2の時刻情報に変換する
前記(11)に記載の受信装置。
(13)
前記特定の情報は、閏秒の制御に関する制御情報、及び所定の形式の時刻情報を少なくとも含む
前記(12)に記載の受信装置。
(14)
前記第1の放送方式は、地上デジタルテレビジョン放送の放送方式であり、
前記第2の放送方式は、デジタル有線テレビジョン放送の放送方式である
前記(11)乃至(13)のいずれかに記載の受信装置。
(15)
前記変換部は、前記第1の時刻情報を、前記第2の時刻情報を格納したIP/UDPパケットを含むTLVパケットに変換する
前記(14)に記載の受信装置。
(16)
前記第2の放送方式は、ATSC3.0に準拠した放送方式であり、
前記変換部は、前記第1の時刻情報を、前記第2の時刻情報を格納したIP/UDPパケットを含むALPパケットに変換する
前記(11)乃至(13)のいずれかに記載の受信装置。
(17)
前記変換部は、復調デバイスに含まれる
前記(10)乃至(16)のいずれかに記載の受信装置。
(18)
第1の放送方式の放送信号を受信して復調する受信部と、
前記放送信号を復調して得られるパケットを処理する処理部と
を備える受信装置の受信方法であって、
前記受信部が、前記第1の放送方式で規定された物理層で伝送された第1の時刻情報を、前記第1の放送方式と異なる第2の放送方式で規定された物理層よりも上位の層である上位層で伝送されるパケットに格納されるNTP形式の第2の時刻情報に変換し、
前記処理部が、前記受信部から出力される前記第2の時刻情報を格納したパケットを処理する
受信方法。
Claims (18)
- 第1の放送方式の放送信号を受信する受信部と、
前記第1の放送方式で規定された物理層で伝送された第1の時刻情報を、前記第1の放送方式と異なる第2の放送方式で規定された物理層よりも上位の層である上位層で伝送されるパケットに格納されるNTP形式の第2の時刻情報に変換する変換部と、
前記第2の放送方式の放送信号を送信する送信部と
を備える再送出装置。 - 前記上位層は、トランスポート層であり、
前記パケットは、IP/UDPパケットである
請求項1に記載の再送出装置。 - 前記第1の時刻情報は、時刻に関する特定の情報を含み、
前記変換部は、前記第1の時刻情報を、前記特定の情報と所定の固定値を含む前記第2の時刻情報に変換する
請求項2に記載の再送出装置。 - 前記特定の情報は、閏秒の制御に関する制御情報、及び所定の形式の時刻情報を少なくとも含む
請求項3に記載の再送出装置。 - 前記第1の放送方式は、地上デジタルテレビジョン放送の放送方式であり、
前記第2の放送方式は、デジタル有線テレビジョン放送の放送方式である
請求項2に記載の再送出装置。 - 前記変換部は、前記第1の時刻情報を、前記第2の時刻情報を格納したIP/UDPパケットを含むTLVパケットに変換する
請求項5に記載の再送出装置。 - 前記第2の放送方式は、ATSC3.0に準拠した放送方式であり、
前記変換部は、前記第1の時刻情報を、前記第2の時刻情報を格納したIP/UDPパケットを含むALPパケットに変換する
請求項2に記載の再送出装置。 - ネットワークを介してサーバとの間で通信を行う通信部と、
前記第2の時刻情報と、通信経由で取得されたNTP形式の時刻情報とを比較する比較部と
をさらに備え、
前記比較部による比較結果に基づいて、前記第2の放送方式の放送信号と、通信経由で取得された通信信号との遅延を調整する
請求項1に記載の再送出装置。 - 再送出装置が、
第1の放送方式の放送信号を受信し、
前記第1の放送方式で規定された物理層で伝送された第1の時刻情報を、前記第1の放送方式と異なる第2の放送方式で規定された物理層よりも上位の層である上位層で伝送されるパケットに格納されるNTP形式の第2の時刻情報に変換し、
前記第2の放送方式の放送信号を送信する
再送出方法。 - 第1の放送方式の放送信号を受信して復調する受信部と、
前記放送信号を復調して得られるパケットを処理する処理部と
を備え、
前記受信部は、前記第1の放送方式で規定された物理層で伝送された第1の時刻情報を、前記第1の放送方式と異なる第2の放送方式で規定された物理層よりも上位の層である上位層で伝送されるパケットに格納されるNTP形式の第2の時刻情報に変換する変換部を有し、
前記処理部は、前記受信部から出力される前記第2の時刻情報を格納したパケットを処理する
受信装置。 - 前記上位層は、トランスポート層であり、
前記パケットは、IP/UDPパケットである
請求項10に記載の受信装置。 - 前記第1の時刻情報は、時刻に関する特定の情報を含み、
前記変換部は、前記第1の時刻情報を、前記特定の情報と所定の固定値を含む前記第2の時刻情報に変換する
請求項11に記載の受信装置。 - 前記特定の情報は、閏秒の制御に関する制御情報、及び所定の形式の時刻情報を少なくとも含む
請求項12に記載の受信装置。 - 前記第1の放送方式は、地上デジタルテレビジョン放送の放送方式であり、
前記第2の放送方式は、デジタル有線テレビジョン放送の放送方式である
請求項11に記載の受信装置。 - 前記変換部は、前記第1の時刻情報を、前記第2の時刻情報を格納したIP/UDPパケットを含むTLVパケットに変換する
請求項14に記載の受信装置。 - 前記第2の放送方式は、ATSC3.0に準拠した放送方式であり、
前記変換部は、前記第1の時刻情報を、前記第2の時刻情報を格納したIP/UDPパケットを含むALPパケットに変換する
請求項11に記載の受信装置。 - 前記変換部は、復調デバイスに含まれる
請求項10に記載の受信装置。 - 第1の放送方式の放送信号を受信して復調する受信部と、
前記放送信号を復調して得られるパケットを処理する処理部と
を備える受信装置の受信方法であって、
前記受信部が、前記第1の放送方式で規定された物理層で伝送された第1の時刻情報を、前記第1の放送方式と異なる第2の放送方式で規定された物理層よりも上位の層である上位層で伝送されるパケットに格納されるNTP形式の第2の時刻情報に変換し、
前記処理部が、前記受信部から出力される前記第2の時刻情報を格納したパケットを処理する
受信方法。
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