WO2011105250A1 - Transmission device, reception device, communication system, transmission method, and conversion method - Google Patents

Transmission device, reception device, communication system, transmission method, and conversion method Download PDF

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Publication number
WO2011105250A1
WO2011105250A1 PCT/JP2011/053129 JP2011053129W WO2011105250A1 WO 2011105250 A1 WO2011105250 A1 WO 2011105250A1 JP 2011053129 W JP2011053129 W JP 2011053129W WO 2011105250 A1 WO2011105250 A1 WO 2011105250A1
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WO
WIPO (PCT)
Prior art keywords
transmission
broadcast
packet
signal
header
Prior art date
Application number
PCT/JP2011/053129
Other languages
French (fr)
Japanese (ja)
Inventor
隼人 道口
謙介 霜觸
健志 福原
Original Assignee
日本電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電気株式会社 filed Critical 日本電気株式会社
Priority to BR112012020939-6A priority Critical patent/BR112012020939B1/en
Publication of WO2011105250A1 publication Critical patent/WO2011105250A1/en

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Classifications

    • 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
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/71—Wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/75—Media network packet handling
    • H04L65/762—Media network packet handling at the source 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/04—Protocols for data compression, e.g. ROHC
    • 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
    • H04N21/23611—Insertion of stuffing data into a multiplex stream, e.g. to obtain a constant bitrate
    • 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
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
    • 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]
    • H04N21/60—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 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite

Definitions

  • the present invention relates to a transmission device, a reception device, a communication system, a transmission method, and a conversion method for transmitting a broadcast stream.
  • a technique for transmitting a TS (Transport Stream) having a terrestrial digital broadcasting signal format to a predetermined transmitting station or relay station is known.
  • a TS having a terrestrial digital broadcast signal format can be generally called a broadcast stream.
  • a broadcasting TS having an ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) format can be cited.
  • the broadcast TS is configured by a multiplexed frame in which a plurality of pieces of information (for example, audio information, video information, and data information) are multiplexed.
  • a multiplexed frame is generated by multiplexing a frame in which a plurality of pieces of information are multiplexed.
  • the multiplex frame is composed of a plurality of broadcast TS packets.
  • Patent Document 1 discloses a transmission system that converts an ISDB-T format broadcast TS into a satellite digital broadcast signal format and transmits the converted broadcast TS to a relay station via the broadcast satellite, and a converted version from the broadcast satellite.
  • a relay station that receives a broadcast TS and converts the received broadcast TS into ISDB-T format is described.
  • the transmission system described in Patent Document 1 deletes a null packet in an ISDB-T format broadcast TS in order to reduce the amount of transmission, and the broadcast TS from which the null packet is deleted is converted into a satellite digital signal. Convert to broadcast signal format and transmit the converted broadcast TS.
  • Patent Document 1 deletes a null packet in a broadcast TS in ISDB-T format.
  • the configuration of the multiplex frame having the deleted null packet is destroyed.
  • the transmitting apparatus of the present invention generates a data signal by compressing a broadcast stream including a frame composed of a broadcast packet including a header part, a data part, and an additional information part, and transmits the data signal to a plurality of transmissions.
  • the transmission device transmits using the packet, and at least one of the parts configured by the header portion and the data portion in the null packet Generating means for compressing the broadcast stream and generating the data signal by converting the compression target portion, which is a portion, into a display information portion having a size smaller than the size of the compression target portion and indicating the null packet And transmitting means for transmitting the data signal using the plurality of transmission packets.
  • the receiving device of the present invention includes a receiving unit that receives a plurality of transmission packets transmitted from the transmitting device, an acquiring unit that acquires the data signal from a plurality of transmission packets received by the receiving unit, and the acquisition Change means for changing the data signal to a broadcast stream by changing the display information portion to the compression target portion when the display information portion is present in the data signal acquired by the means. .
  • the communication system of the present invention includes the transmission device and the reception device.
  • a data stream is generated by compressing a broadcast stream including a frame composed of a broadcast packet including a header part, a data part, and an additional information part, and the data signal is transmitted in a plurality of ways.
  • a transmission method in a transmission apparatus that transmits using a packet, and when a null packet that is a kind of the broadcast packet exists in the broadcast stream, it is configured by a header portion and a data portion in the null packet
  • the broadcast stream is compressed to convert the data signal And transmitting the data signal using the plurality of transmission packets.
  • the conversion method of the present invention is a conversion method in a receiving apparatus, which receives a plurality of transmission packets transmitted from the transmitting apparatus, acquires the data signal from the plurality of transmission packets, and stores the data signal in the data signal When the display information part exists, the data signal is changed to a broadcast stream by changing the display information part to the compression target part.
  • the amount of transmission can be reduced, and the receiving apparatus can reproduce the broadcast stream without reconfiguring the frame structure of the broadcast stream.
  • FIG. 6 is a diagram showing a broadcast TS, a signal A, and a signal B that are processed by the transmission side TS converter 12.
  • FIG. 5 is a diagram showing a signal B ′, a signal A ′, and a broadcast TS processed by the reception-side TS converter 22.
  • FIG. 1A is a diagram showing an example of a broadcasting system using a satellite line according to an embodiment of the present invention.
  • the broadcasting system includes a transmitting station system 1, a receiving station system 2, and a satellite device 3.
  • a broadcast system can generally be referred to as a communication system.
  • the transmission station system 1 can generally be called a transmission device.
  • the receiving station system 2 can be generally called a receiving device.
  • the transmission station system 1 includes an ISDB-T MUX (multiplexer) device 11, a transmission side TS conversion device 12, a satellite line transmitter 13, and a reference signal generator 14.
  • ISDB-T MUX multiplexer
  • the reference signal generator 14 is a GPS (Global Positioning System) synchronous reference signal generator.
  • the reference signal generator 14 generates a 10 MHz reference signal synchronized with the GPS signal.
  • the reference signal generator 14 outputs a 10 MHz reference signal to the ISDB-T MUX device 11.
  • the ISDB-T MUX device 11 is a TS (Transport Stream) multiplexing device for digital terrestrial broadcasting.
  • the ISDB-T MUX device 11 generates a clock synchronized with the 10 MHz reference signal output from the reference signal generator 14.
  • the ISDB-T MUX device 11 generates a broadcast TS of 32.5 Mbps (packet size is 204 bytes) synchronized with the clock.
  • a broadcast TS can generally be called a broadcast stream.
  • the broadcast TS generated by the ISDB-T MUX device 11 is a broadcast TS in the ISDB-T format.
  • the ISDB-T format broadcast TS includes a multiplexed frame in which a plurality of pieces of information (for example, audio information, video information, and data information) are multiplexed.
  • a multiplex frame is generated by multiplexing a frame in which a plurality of pieces of information are multiplexed. Multiple frames can generally be referred to as frames.
  • the multiplex frame is composed of a plurality of broadcast TS packets.
  • a broadcast TS packet can be generally called a broadcast packet.
  • FIG. 2A is a diagram showing a configuration of the broadcast TS packet 4.
  • a broadcast TS packet 4 includes a TS header portion 41 indicating information such as a 0x47 value (hexadecimal display), a packet ID (PID), and a continuity counter value, an adaptation field, and a payload (hereinafter “ (Referred to as “payload part”) 42 and a dummy byte part 43.
  • a TS header portion 41 indicating information such as a 0x47 value (hexadecimal display), a packet ID (PID), and a continuity counter value, an adaptation field, and a payload (hereinafter “ (Referred to as “payload part”) 42 and a dummy byte part 43.
  • the TS header portion 41 can generally be called a header portion.
  • Payload portion 42 can be generally referred to as a data portion.
  • Dummy byte portion 43 can generally be referred to as an additional information portion.
  • the size of the TS header section 41 is 4 bytes.
  • the size of the payload part 42 is 184 bytes.
  • the size of the dummy byte part 43 is 16 bytes. For this reason, the size of the broadcast TS packet 4 is 204 bytes.
  • control information defined by the ISDB-T method is described.
  • This control information is called ISDB-T Information (hereinafter referred to as “II”).
  • This control information includes layer information indicating the layer of the broadcast TS packet 4.
  • error correction information defined by the ISDB-T method is described.
  • a Reed-Solomon (hereinafter referred to as “RS”) code is used.
  • the dummy byte part is also referred to as an II + RS part.
  • the ISDB-T MUX device 11 shown in FIG. 1A outputs the broadcast TS to the transmission side TS converter 12.
  • the ISDB-T MUX device 11 uses a transmission bit rate adjustment packet called a null packet as a packet constituting the broadcast TS, that is, a broadcast packet, as a transmission side TS. Output to the converter 12.
  • Null packets that make up a broadcast TS form part of a multiplex frame that is a component of the broadcast TS.
  • the Null packet constituting the broadcast TS also includes a TS header part 41 having a size of 4 bytes, a payload part 42 having a size of 184 bytes, an II + RS part 43 having a size of 16 bytes, Consists of.
  • the transmission-side TS converter 12 converts the broadcast TS into a transmission TS.
  • a transmission TS can be generally referred to as a transmission stream.
  • the transmission TS is composed of a plurality of transmission TS packets.
  • a transmission TS packet can be generally referred to as a transmission packet.
  • FIG. 2B is a diagram showing the configuration of the transmission TS packet 5.
  • a transmission TS packet 5 includes a transmission TS header portion 51 indicating a 0x47 value (in hexadecimal notation) and a Payload_unit_start_indicator value, a portion (hereinafter referred to as a “payload portion”) 52 including an adaptation field and a payload. , Is composed of.
  • the transmission TS header 51 can be generally called a header.
  • Payload portion 52 can generally be referred to as a data portion.
  • the size of the transmission TS header 51 is 4 bytes.
  • the size of the payload part 52 is 184 bytes. For this reason, the size of the transmission TS packet 5 is 188 bytes.
  • FIG. 1B is a block diagram showing the TS converter 12 on the transmission side.
  • the transmission-side TS conversion device 12 includes a broadcast TS synchronization unit 121, a null packet compression unit 122, a transmission TS packetization unit 123, and a speed conversion processing unit 124.
  • Broadcast TS synchronization section 121 and null packet compression section 122 are included in generation section 12A.
  • Generation unit 12A can be generally referred to as generation means.
  • the transmission TS packetizing unit 123, the speed conversion processing unit 124, and the satellite line transmitter 13 are included in the transmission unit 12B.
  • Transmitter 12B can generally be referred to as a transmission means.
  • FIG. 3 is a diagram showing a broadcast TS, a signal A, and a signal B that are processed by the transmission-side TS converter 12.
  • the generation unit 12A illustrated in FIG. 1B sets the TS header part (4 bytes) 41 and the payload part (184 bytes) 42 in the null packet.
  • the broadcast TS is compressed by converting into the first display byte (1 byte), and the signal A which is a data signal is generated.
  • the generation unit 12A outputs the signal A to the transmission unit 12B.
  • the head display byte indicates a 0xB8 value indicating the head of the null packet.
  • a portion composed of the TS header portion 41 and the payload portion 42 in the Null packet that is a broadcast TS packet can be called a compression target portion.
  • the compression target part is at least a part of a part constituted by the TS header part 41 and the payload part 42 in a Null packet that is a broadcast TS packet.
  • the transmission unit 12B transmits the signal A using a plurality of transmission TS packets.
  • the broadcast TS synchronization unit 121 detects the synchronization of the broadcast TS. For example, the broadcast TS synchronization unit 121 detects the 0x47 value from the TS header unit 41 in the broadcast TS packet 4. The broadcast TS synchronization unit 121 generates a synchronization signal synchronized with the detection timing of the 0x47 value. Broadcast TS synchronization section 121 outputs a synchronization signal to Null packet compression section 122.
  • the Null packet compression unit 122 compresses the Null packet in the broadcast TS (see FIG. 3) to generate a signal A (see FIG. 3).
  • the Null packet compression unit 122 reads information described in the TS header portion 41 of the broadcast TS packet 4 at a timing synchronized with the synchronization signal from the broadcast TS synchronization unit 121.
  • the null packet compression section 122 and the payload section in the packet including the TS header section 41 (that is, the null packet) 42 is deleted, and a signal A is generated by adding a head display byte to the remaining II + RS unit 43 of the null packet.
  • the head display byte can be generally called a display information portion indicating a null packet.
  • the size of the first display byte is 1 byte. For this reason, the size (1 byte) of the head display byte is smaller than the total size (188 bytes) of the TS header part 41 of the null packet and the payload part 42 of the null packet.
  • the Null packet compression unit 122 outputs the signal A to the transmission TS packetization unit 123.
  • the transmission TS packetizing unit 123 divides the signal A into units of 184 bytes from the head of the signal A, that is, the size of the payload part 52 of the transmission TS packet 5, and the payload of the transmission TS packet 5 A part 52 is generated.
  • the transmission TS packetization unit 123 generates a 188-byte transmission TS packet 5 by newly adding a 4-byte transmission TS header 51 to each payload portion 52 of the transmission TS packet 5.
  • the transmission TS packetizing unit 123 generates a signal B composed of the transmission TS packet 5 (see FIG. 3).
  • the transmission TS packetizing unit 123 converts the TS header part (hereinafter referred to as “first TS header part”) 41 of the first broadcast TS packet 4 in the ISDB-T multiplex frame into the frame constituting the signal B.
  • the first transmission TS packet (hereinafter referred to as “first transmission TS packet”) 5 is arranged at the head position of the payload portion 52.
  • the transmission TS packetizing unit 123 sets the Payload_unit_start_indicator value in the transmission TS header 51 in the head transmission TS packet 5 to “1”, and the head transmission TS packet is a boundary between multiple frames constituting the broadcast TS. It shows that.
  • the transmission TS packetizing unit 123 outputs the signal B to the speed conversion processing unit 124.
  • the speed conversion processing unit 124 generates a transmission TS by inserting a null packet into the signal B in order to convert the bit rate of the signal B into a bit rate for the transmission TS.
  • the speed conversion processing unit 124 outputs the transmission TS to the satellite line transmitter 13.
  • the satellite line transmitter 13 Upon receiving the transmission TS, the satellite line transmitter 13 transmits the transmission TS to the satellite device 3.
  • the satellite device 3 When the satellite device 3 receives the transmission TS, it transmits the transmission TS to the receiving station system 2.
  • the receiving station system 2 includes a satellite line receiver 21, a receiving side TS converter 22, an ISDB-T transmission facility 23, and a reference signal generator 24.
  • the reference signal generator 24 is a GPS synchronous reference signal generator.
  • the reference signal generator 24 generates a 10 MHz reference signal synchronized with the GPS signal.
  • the reference signal generator 24 outputs a 10 MHz reference signal to the reception-side TS converter 22.
  • Satellite line receiver 21 can be generally referred to as receiving means.
  • the satellite line receiver 21 receives the transmission TS from the satellite device 3.
  • the satellite line receiver 21 receives a plurality of transmission TS packets 5 from the satellite device 3.
  • the satellite line receiver 21 outputs the transmission TS to the reception-side TS converter 22.
  • the receiving-side TS converter 22 receives the transmission TS received from the satellite line receiver 21 and the 10 MHz reference signal output from the reference signal generator 24, and transmits the broadcast TS transmission clock synchronized with the 10 MHz reference signal. And restore the broadcast TS from the transmission TS.
  • FIG. 1C is a block diagram showing the receiving-side TS converter 22.
  • the receiving side TS converter 22 includes a transmission TS synchronization unit 221, a speed conversion processing unit 222, a transmission TS header removal unit 223, a head display byte search processing unit 224, and a broadcast TS packetization unit 225. And including.
  • the transmission TS synchronization unit 221, the speed conversion processing unit 222, and the transmission TS header removal unit 223 can be referred to as an acquisition unit 22A.
  • Acquisition unit 22A can be generally referred to as acquisition means.
  • the head display byte search processing unit 224 and the broadcast TS packetizing unit 225 can be referred to as a changing unit 22B.
  • Changing unit 22B can be generally referred to as changing means.
  • FIG. 4 is a diagram showing a signal B ′, a signal A ′, and a broadcast TS processed by the reception side TS converter 22.
  • the acquiring unit 22A illustrated in FIG. 1C acquires the signal A from a plurality of transmission TS packets received by the satellite line receiver 21.
  • the acquiring unit 22A outputs the acquired signal A as a signal A ′ to the changing unit 22B.
  • the changing unit 22B changes the head display byte to the TS header part 41 and the payload part 42 of the Null packet that is the broadcast TS packet 4, thereby changing the signal A ′. Is changed to broadcasting TS.
  • the transmission TS synchronization unit 221 detects the synchronization of the transmission TS. For example, the transmission TS synchronization unit 221 detects the 0x47 value from the transmission TS header 51 in the transmission TS input to the reception-side TS converter 22.
  • the transmission TS synchronization unit 221 generates a synchronization signal synchronized with the detection timing of the 0x47 value.
  • Transmission TS synchronization section 221 outputs the synchronization signal to speed conversion processing section 222.
  • the speed conversion processing unit 222 receives the transmission TS and the synchronization signal from the transmission TS synchronization unit 211.
  • the speed conversion processing unit 222 reads information described in the transmission TS header 51 of the transmission TS packet 5 at a timing synchronized with the synchronization signal from the transmission TS synchronization unit 211.
  • the speed conversion processing unit 222 transmits the transmission TS packet having the transmission TS header 51 in which the PID indicating the null packet is described, that is, the speed conversion.
  • the Null packet inserted by the processing unit 124 when converting the transmission bit rate is deleted from the transmission TS to generate a signal B ′.
  • the signal B ′ shows the same content as the signal B.
  • the speed conversion processing unit 222 detects the 0x47 value from the transmission TS header unit 51 in the signal B ', and generates synchronization information indicating the detection timing of the 0x47 value.
  • the speed conversion processing unit 222 outputs the signal B ′ and the synchronization information to the transmission TS header removal unit 223.
  • the head TS header portion is arranged immediately after the head header TS section 51 for transmission.
  • the transmission TS header removal unit 223 uses the detection result of the head transmission TS header 51 to identify the head TS header immediately after the head transmission TS header 51.
  • the transmission TS header removal unit 223 removes the transmission TS header 51 from the signal B ′ to generate a signal A ′.
  • the transmission TS header removal unit 223 generates specific information for specifying the position where the head TS header part is present in the signal A ′.
  • specific information for example, a signal synchronized with the signal A ′ in which “H” appears when the first TS header portion appears in the signal A ′ is used.
  • the transmission TS header removal unit 223 outputs the signal A ′ and the specific information to the head display byte search processing unit 224 and the broadcast TS packetization unit 225.
  • the broadcast TS packetizing unit 225 only needs to output the signal A ′, and the specific information may not be output to the broadcast TS packetizing unit 225.
  • the head display byte search processing unit 224 When the head display byte search processing unit 224 receives the signal A ′ and the specific information, the head TS header portion (the first broadcast of the ISDB-T multiplexed frame) whose position in the signal A ′ is specified by the specific information is received. The TS header part included in the TS packet) is detected from the signal A ′.
  • the head display byte search processing unit 224 When the head display byte search processing unit 224 detects the head TS header part, it generates head TS header part position information for specifying the position of the head TS header part in the signal A ′.
  • the head display byte search processing unit 224 may use the specific information from the transmission TS header removal unit 223 as head TS header part position information.
  • the head display byte search unit 224 detects the TS header part after that and the head display byte having a value of 0xB8 with reference to the head TS header part.
  • the head display byte search unit 224 uses the detection result to identify the TS header part position information for identifying the position where the TS header part is present in the signal A ′, and the head display byte is present in the signal A ′. Head display byte position information for specifying the position to be generated.
  • TS header portion position information for example, a signal that becomes “H” when the TS header portion appears in the signal A ′ and is synchronized with the signal A ′ is used.
  • head display byte position information for example, a signal that becomes “H” when the head display byte appears in the signal A ′ and is synchronized with the signal A ′ is used.
  • the head display byte search processing unit 224 outputs the head TS header part position information, the TS header part position information, and the head display byte position information to the broadcast TS packetization unit 225.
  • the broadcast TS packetization unit 225 uses the TS header part position information and the head display byte position information to check the synchronization state of the signal A ′ and the TS header part position information and the head display byte position information.
  • the broadcast TS packetization unit 225 uses the head TS header part position information to start the multiplexed frame starting position of the multiplexed TS. Further, based on the head display byte position information, the Null packet existing in the broadcast TS from the ISDB-T MUX device 11 is reproduced to restore the 32.5 Mbps broadcast TS in 204 byte format.
  • null packet which is a broadcast TS packet composed of a total of 204 bytes, in which the TS header portion 41 is 4 bytes, the payload portion 42 is 184 bytes, and the dummy byte portion 43 is 16 bytes, is restored.
  • a null packet which is a broadcast TS packet composed of a total of 204 bytes, in which the TS header portion 41 is 4 bytes, the payload portion 42 is 184 bytes, and the dummy byte portion 43 is 16 bytes.
  • the broadcast TS packetization unit 225 outputs the restored broadcast TS to the ISDB-T transmission facility 23.
  • the ISDB-T transmission facility 23 When the ISDB-T transmission facility 23 receives the broadcast TS, the ISDB-T transmission facility 23 converts the broadcast TS into an ISDB-T modulated wave and transmits a signal for digital terrestrial broadcasting.
  • the broadcast TS packetizing unit 225 performs a predetermined error process when the signal A ′ is not synchronized with the TS header part position information and the head display byte position information.
  • the broadcast TS (see FIG. 3) input to the transmission-side TS converter 12 has a 0x47 value detected from the TS header unit 41 by the broadcast TS synchronization unit 121, and then the null packet compression unit 122 performs null in the broadcast TS.
  • the TS header part 41 (4 bytes) and the payload part 42 (184 bytes) of the packet are deleted.
  • the Null packet compression unit 122 adds a head display byte (1 byte) to the remaining II + RS unit 43 (16 bytes) to generate a signal A shown in FIG.
  • the Null packet compression unit 122 outputs the signal A to the transmission TS packetization unit 123.
  • the transmission TS packetization unit 123 When the transmission TS packetization unit 123 receives the signal A, the transmission TS packetization unit 123 divides the signal A in units of 184 bytes from the beginning of the data, and generates a payload unit 52 of the transmission TS packet. The transmission TS packetization unit 123 generates a transmission TS packet 5 of 188 bytes by newly adding a transmission TS header 51 (4 bytes) to each of the payload parts 52 of the transmission TS packet. A signal B (see FIG. 3) composed of the packet 5 is generated.
  • the transmission TS packetizing unit 123 converts the first TS header part (TS header part of the first broadcast TS packet 4 in the ISDB-T multiplex frame) 41 into the first transmission TS packet (in the frame constituting the signal B). It is arranged at the head position of the payload portion 52 of the head transmission TS packet) 5.
  • the transmission TS packetizing unit 123 sets the Payload_unit_start_indicator value in the transmission TS header 51 in the first transmission TS packet 5 to “1”, and the first transmission TS packet is at the boundary of the multiple frames constituting the broadcast TS. Indicates that there is.
  • the transmission TS packetizing unit 123 outputs the signal B to the speed conversion processing unit 124.
  • the speed conversion processing unit 124 When receiving the signal B, the speed conversion processing unit 124 generates a transmission TS by inserting a null packet into the signal B in order to convert the bit rate of the signal B into a bit rate for the transmission TS.
  • the transmission TS generated by the transmission side TS converter 12 is output to the satellite line transmitter 13 and transmitted from the satellite line transmitter 13 to the satellite apparatus 3.
  • the satellite device 3 transmits the transmission TS to the satellite line receiver 21.
  • the receiving-side TS converter 22 receives the transmission TS received by the satellite line receiver 21.
  • the transmission TS synchronization unit 221 detects a 0x47 value from the transmission TS header 51 in the transmission TS input to the reception-side TS converter 22, and generates a synchronization signal synchronized with the detection timing of the 0x47 value.
  • the transmission TS synchronization unit 221 outputs the synchronization signal to the speed conversion processing unit 222.
  • the speed conversion processing unit 124 When the speed conversion processing unit 222 receives the transmission TS input to the reception-side TS conversion device 22 and the synchronization signal from the transmission TS synchronization unit 221, the speed conversion processing unit 124 transmits the transmission bit rate from the transmission TS.
  • the null packet inserted at the time of conversion is deleted, and a signal B ′ shown in FIG. 4 is generated.
  • the speed conversion processing unit 222 detects the 0x47 value from the transmission TS header unit 51 in the signal B ′, and generates synchronization information indicating the detection timing of the 0x47 value.
  • the speed conversion processing unit 222 outputs the signal B ′ and the synchronization information to the transmission TS header removal unit 223.
  • the transmission TS header removing unit 223 uses the detection result of the leading transmission TS header 51 to identify the leading TS header immediately after the leading transmission TS header 51. To do.
  • the transmission TS header removal unit 223 removes the transmission TS header 51 from the signal B ′ to generate a signal A ′.
  • the transmission TS header removal unit 223 When the transmission TS header removal unit 223 creates the signal A ′, the transmission TS header removal unit 223 generates specific information for specifying the position where the leading TS header portion exists in the signal A ′.
  • the transmission TS header removal unit 223 When the transmission TS header removal unit 223 generates the specific information, the transmission TS header removal unit 223 outputs the signal A ′ and the specific information to the head display byte search processing unit 224 and the broadcast TS packetization unit 225.
  • the head display byte search processing unit 224 When the head display byte search processing unit 224 receives the signal A ′ and the specific information, the head TS header portion (the first broadcast of the ISDB-T multiplexed frame) whose position in the signal A ′ is specified by the specific information is received. The TS header part included in the TS packet) is detected from the signal A ′.
  • the head display byte search processing unit 224 When the head display byte search processing unit 224 detects the head TS header part, it generates head TS header part position information.
  • the head display byte search unit 224 detects the TS header part after that and the head display byte having the value 0xB8 with reference to the head TS header part, and TS header part position information and head display byte position information. And generate
  • the head display byte search processing unit 224 outputs the head TS header part position information, the TS header part position information, and the head display byte position information to the broadcast TS packetization unit 225.
  • the broadcast TS packetization unit 225 When receiving the signal A ′, the specific information, the head TS header part position information, the TS header part position information, and the head display byte position information, the broadcast TS packetization unit 225 receives the TS header part position information, the head display byte position information, and Is used to confirm the synchronization state of the signal A ′ with the TS header part position information and the head display byte position information.
  • the broadcast TS packetization unit 225 uses the head TS header part position information to start the multiplexed frame starting position of the multiplexed TS. Further, based on the head display byte position information, the Null packet existing in the broadcast TS from the ISDB-T MUX device 11 is reproduced to restore the 32.5 Mbps broadcast TS in 204 byte format.
  • the broadcast TS packetization unit 225 when the TS header part is present at the head position of the signal A ′, sets the TS header part as the head position and the 204th byte from the TS header part as the last position.
  • the signal is divided from the signal A ′, and the signal divided from the signal A ′ is handled as a broadcast TS packet.
  • the broadcast TS packetizing section 225 sets the TS header section as the head position and the 204th byte from the TS header section.
  • the signal as the final position is divided from the signal A ′, and the signal divided from the signal A ′ is handled as a broadcast TS packet.
  • the broadcast TS packetization unit 225 deletes the head display byte when the head display byte is present at the head position of the signal A ′, and the TS header section 41 having the PID (packet ID) of the null packet and the payload section. 42 is added to the head portion of the signal A ′.
  • the broadcast TS packetization unit 225 stores the II + RS unit 43 added to the rear part of the head display byte as it is, and stores 184 bytes of compressed invalid data in the payload part 42.
  • the broadcast TS packetization unit 225 converts a Null packet including a TS header unit 41 having a PID of a null packet, a payload unit 42 in which invalid data is stored, and an II + RS unit 43 into a signal A as a broadcast TS packet. Split from '.
  • the broadcast TS packetization unit 225 deletes the head display byte when the head display byte exists at the head position of the signal A ′ obtained by dividing the broadcast TS packet, and the TS header unit 41 having the PID of the null packet. And the payload portion 42 are added to the head portion of the signal A ′.
  • the broadcast TS packetization unit 225 stores the II + RS unit 43 added to the rear part of the head display byte as it is, and stores 184 bytes of compressed invalid data in the payload part 42.
  • the broadcast TS packetizing unit 225 converts a null packet including a TS header unit 41 having a PID of a null packet, a payload unit 42 in which invalid data is stored, and an II + RS unit 43 into a broadcast TS packet as a signal A. Split from '.
  • the transmission clock for the broadcast TS restored by the broadcast TS packetization unit 225 is synchronized with the GPS signal in the same way as the broadcast TS of the transmission station system 1, and is generated by the ISDB-T MUX device 11. Fully synchronized with the transmission clock.
  • the position of each packet in the broadcast TS (ISDB-T multiple frame) restored by the broadcast TS packetization unit 225 is also in the broadcast TS (ISDB-T multiple frame) generated by the ISDB-T MUX device 11. Exactly matches the position of each packet in
  • the structure of the broadcast TS (ISDB-T multiple frame structure) restored by the broadcast TS packetization unit 225 is the same as the structure of the broadcast TS generated by the ISDB-T MUX device 11 (ISDB-T multiple frame structure). Match exactly.
  • the arrangement positions of the PCR packets are the same, and it is not necessary to correct the PCR values in the PCR packets.
  • the broadcast TS restored by the receiving side TS converter 22 is input to the ISDB-T transmission facility 23.
  • the generation unit 12 ⁇ / b> A has a TS header part 41 and a payload part 42 in the Null packet. That is, the broadcast TS is compressed by converting the compression target portion into the head display byte, and the signal A which is a data signal is generated.
  • the transmission unit 12B transmits the signal A using a plurality of transmission TS packets 5.
  • the signal A existing in a compressed state of the Null packet in the broadcast TS is transmitted using a plurality of transmission TS packets. Therefore, it is possible to reduce the amount of transmission and compress the transmission band compared to the case where a broadcast TS that exists in a compressed state of Null packets in the broadcast TS is transmitted using a plurality of transmission TS packets. .
  • the number of packets and the sequence of packets in the broadcast TS are maintained even with the signal A. For this reason, the structure of the multiplex frame constituted by the packets in the broadcast TS is also maintained by the signal A.
  • the satellite line receiver 21 receives a plurality of transmission TS packets 5 transmitted from the transmitting station system 1.
  • the acquiring unit 22A acquires the signal A from the plurality of transmission TS packets 5 received by the satellite line receiver 21, and outputs the signal A as the signal A '.
  • the changing unit 22B changes the head display byte to the TS header part 41 and the payload part 42 of the Null packet that is the broadcast TS packet 4, thereby changing the signal A ′. Change to broadcast TS.
  • the number of packets and the arrangement of packets in the broadcast TS are also maintained by the signal A. For this reason, the structure of the multiplex frame constituted by the packets in the broadcast TS is also maintained by the signal A. Therefore, if the receiving station system 2 restores the compressed Null packet present in the signal A, it is possible to reproduce the broadcast TS without considering the configuration of the multiplexed frame.
  • the receiving station system 2 regenerate the frame configuration pattern based on the transmission TS, and to reconstruct the multiplexed frame based on the regenerated frame configuration pattern.
  • the multiplexed position of the PCR packet in the broadcast TS after playback is the same as the multiplexed position of the PCR packet in the original broadcast TS. Become. This eliminates the need for a PCR correction circuit for correcting the information in the PCR packet in the transmitting station system 1 and the receiving station system 2.
  • the size of the transmission TS packet is 188 bytes.
  • the size of the transmission TS packet can be changed as appropriate, and may be 204 bytes, for example.
  • the broadcast TS for terrestrial digital broadcasting is used as the broadcast TS.
  • the broadcast TS can be appropriately changed.
  • the broadcast TS for BS / CS digital broadcast is used as the broadcast TS. May be.
  • the ISDB-T broadcast TS is used as the digital terrestrial broadcast TS.
  • the digital terrestrial broadcast TS can be appropriately changed.
  • a retransmission system that retransmits the restored broadcast TS may be used.
  • the Null packet compression unit 122 does not leave all dummy byte parts (16 bytes) when compressing Null packets. Only the ISDB-T_information part (8 bytes) may be left out of the dummy byte part. In this case, it is possible to further reduce the transmission amount and further compress the transmission band.
  • the top packet of the ISDB-T multiplex frame comes to the payload of the top packet in the frame in the transmission TS, but the top packet of the ISDB-T multiplex frame and the packet in the transmission TS
  • the relationship with the first packet in the frame is not limited to the above.
  • the TS header part of the broadcast TS is arranged immediately after the transmission TS header part of the transmission TS, and the TS header part of the broadcast TS immediately follows the transmission TS header part.
  • the Payload_unit_start_indicator value may be set to “1”.
  • the transmission TS is transmitted via the satellite device 3, but the transmission TS may be transmitted without the satellite device 3.
  • the transmission station system 1 has the ISDB-T NUX device 11 and the reference signal generator 14, but the transmission station system 1 has the ISDB-T NUX device 11 and the reference signal generator 14.
  • the transmission-side TS conversion device 12 in the transmission station system 1 may receive a broadcast TS from the external ISDB-T NUX device 11.
  • a part composed of the TS header part 41 and the payload part 42 in the Null packet which is a kind of broadcast TS packet is used as the compression target part.
  • the compression target part can be changed as appropriate. is there.
  • only the TS header part 41 in the Null packet that is a kind of broadcast TS packet may be used as the compression target part, or the TS header part 41 and the payload in the Null packet that is a kind of broadcast TS packet.
  • a part combined with a part of the part 42 may be used.
  • this embodiment can be used for a transmission system for a terrestrial digital broadcasting TS or a BS / CS digital broadcasting TS using various lines such as a satellite line and an FPU (Field Pickup Unit) line.
  • a satellite line such as a satellite line and an FPU (Field Pickup Unit) line.
  • FPU Field Pickup Unit

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Abstract

The disclosed transmission device—which generates a data signal by compressing a broadcast stream that has as configuring elements frames configured from broadcast packets comprising a header section, a data section, and an additional information section without being aware of the frame configuration of the broadcast stream and in a manner so that a reception device can replay the broadcast stream, and which transmits the data signal using a plurality of transmission packets—contains: a generating unit that, when a null packet, which is a type of broadcast packet, is present within the broadcast stream, compresses the broadcast stream—generating a data signal—by means of converting a section to be compressed, which is at least a part of the portion configured from the header section and the data section in the null packet, to a display information section that indicates the null packet and that has a smaller size than the size of the section to be compressed; and a transmission unit that transmits a data signal using a plurality of transmission packets.

Description

送信装置、受信装置、通信システム、送信方法および変換方法Transmission device, reception device, communication system, transmission method, and conversion method
　本発明は、放送ストリームを伝送するための送信装置、受信装置、通信システム、送信方法および変換方法に関する。 The present invention relates to a transmission device, a reception device, a communication system, a transmission method, and a conversion method for transmitting a broadcast stream.
　地上デジタル放送の信号形式を有するTS（Transport　Stream）を、所定の送信局または中継局に伝送する手法が知られている。なお、地上デジタル放送の信号形式を有するTSは、一般的に放送ストリームと呼ぶことができる。 A technique for transmitting a TS (Transport Stream) having a terrestrial digital broadcasting signal format to a predetermined transmitting station or relay station is known. A TS having a terrestrial digital broadcast signal format can be generally called a broadcast stream.
　地上デジタル放送の信号形式を有するTSとしては、ISDB-T（Integrated　Services　Digital　Broadcasting-Terrestrial）形式を有する放送TSが挙げられる。放送TSは、複数の情報（例えば、音声情報と映像情報とデータ情報）が多重化された多重フレームにて構成される。ISDB-T形式を有する放送TSでは、多重フレームは、複数の情報が多重化されたフレームを多重化することによって生成される。多重フレームは、複数の放送TSパケットにて構成される。 As a TS having a digital terrestrial broadcasting signal format, a broadcasting TS having an ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) format can be cited. The broadcast TS is configured by a multiplexed frame in which a plurality of pieces of information (for example, audio information, video information, and data information) are multiplexed. In a broadcast TS having the ISDB-T format, a multiplexed frame is generated by multiplexing a frame in which a plurality of pieces of information are multiplexed. The multiplex frame is composed of a plurality of broadcast TS packets.
　特許文献１には、ISDB-T形式の放送TSを衛星デジタル放送の信号形式に変換し、変換後の放送TSを放送衛星を介して中継局に伝送する送信システムと、放送衛星から変換後の放送TSを受信し、受信された放送TSをISDB-T形式に変換する中継局と、が記載されている。 Patent Document 1 discloses a transmission system that converts an ISDB-T format broadcast TS into a satellite digital broadcast signal format and transmits the converted broadcast TS to a relay station via the broadcast satellite, and a converted version from the broadcast satellite. A relay station that receives a broadcast TS and converts the received broadcast TS into ISDB-T format is described.
　また、特許文献１に記載の送信システムは、伝送量を少なくするために、ISDB-T形式の放送TS内のNull（ヌル）パケットを削除し、Nullパケットが削除された放送TSを、衛星デジタル放送の信号形式に変換し、変換後の放送TSを伝送する。 In addition, the transmission system described in Patent Document 1 deletes a null packet in an ISDB-T format broadcast TS in order to reduce the amount of transmission, and the broadcast TS from which the null packet is deleted is converted into a satellite digital signal. Convert to broadcast signal format and transmit the converted broadcast TS.
特開２００９－４４３５４号公報JP 2009-44354 A
　特許文献１に記載の送信システムは、ISDB-T形式の放送TS内のNullパケットを削除する。放送TSからNullパケットが削除されると、削除されたNullパケットを有していた多重フレームの構成が崩れる。 The transmission system described in Patent Document 1 deletes a null packet in a broadcast TS in ISDB-T format. When the null packet is deleted from the broadcast TS, the configuration of the multiplex frame having the deleted null packet is destroyed.
　よって、特許文献１に記載の中継器では、例えば、衛星デジタル放送の信号形式に変換された放送TSを、ISDB-T形式の放送TSに変換する際、フレーム構成パターンを再生成し、再生成されたフレーム構成パターンに基づいて、多重フレームを再構築する必要があるという課題があった。 Therefore, in the repeater described in Patent Document 1, for example, when a broadcast TS converted into a satellite digital broadcast signal format is converted into an ISDB-T format broadcast TS, a frame configuration pattern is regenerated and regenerated. There is a problem that it is necessary to reconstruct a multiplex frame based on the frame configuration pattern.
　本発明は、上記課題を解決可能な送信装置、受信装置、通信システム、送信方法および変換方法を提供することにある。 It is an object of the present invention to provide a transmission device, a reception device, a communication system, a transmission method, and a conversion method that can solve the above problems.
　本発明の送信装置は、ヘッダ部とデータ部と付加情報部からなる放送パケットにて構成されたフレームを構成要素とする放送ストリームを圧縮してデータ信号を生成し、当該データ信号を複数の伝送パケットを用いて送信する送信装置であって、前記放送ストリーム内に前記放送パケットの一種であるヌルパケットが存在する場合、当該ヌルパケット内のヘッダ部およびデータ部にて構成される部分の少なくとも一部である圧縮対象部分を、当該圧縮対象部分のサイズよりも小さいサイズを有し前記ヌルパケットを示す表示情報部に変換することによって、前記放送ストリームを圧縮して前記データ信号を生成する生成手段と、前記データ信号を前記複数の伝送パケットを用いて送信する送信手段と、を含む。 The transmitting apparatus of the present invention generates a data signal by compressing a broadcast stream including a frame composed of a broadcast packet including a header part, a data part, and an additional information part, and transmits the data signal to a plurality of transmissions. When a null packet which is a kind of the broadcast packet is present in the broadcast stream, the transmission device transmits using the packet, and at least one of the parts configured by the header portion and the data portion in the null packet Generating means for compressing the broadcast stream and generating the data signal by converting the compression target portion, which is a portion, into a display information portion having a size smaller than the size of the compression target portion and indicating the null packet And transmitting means for transmitting the data signal using the plurality of transmission packets.
　本発明の受信装置は、上記送信装置から送信された複数の伝送パケットを受信する受信手段と、前記受信手段にて受信された複数の伝送パケットから前記データ信号を取得する取得手段と、前記取得手段にて取得されたデータ信号内に前記表示情報部が存在する場合、当該表示情報部を、前記圧縮対象部分に変更することによって、前記データ信号を放送ストリームに変更する変更手段と、を含む。 The receiving device of the present invention includes a receiving unit that receives a plurality of transmission packets transmitted from the transmitting device, an acquiring unit that acquires the data signal from a plurality of transmission packets received by the receiving unit, and the acquisition Change means for changing the data signal to a broadcast stream by changing the display information portion to the compression target portion when the display information portion is present in the data signal acquired by the means. .
　本発明の通信システムは、上記送信装置と、上記受信装置と、を含む。 The communication system of the present invention includes the transmission device and the reception device.
　本発明の送信方法は、ヘッダ部とデータ部と付加情報部からなる放送パケットにて構成されたフレームを構成要素とする放送ストリームを圧縮してデータ信号を生成し、当該データ信号を複数の伝送パケットを用いて送信する送信装置での送信方法であって、前記放送ストリーム内に前記放送パケットの一種であるヌルパケットが存在する場合、当該ヌルパケット内のヘッダ部およびデータ部にて構成される部分の少なくとも一部である圧縮対象部分を、当該圧縮対象部分のサイズよりも小さいサイズを有し前記ヌルパケットを示す表示情報部に変換することによって、前記放送ストリームを圧縮して前記データ信号を生成し、前記データ信号を前記複数の伝送パケットを用いて送信する。 In the transmission method of the present invention, a data stream is generated by compressing a broadcast stream including a frame composed of a broadcast packet including a header part, a data part, and an additional information part, and the data signal is transmitted in a plurality of ways. A transmission method in a transmission apparatus that transmits using a packet, and when a null packet that is a kind of the broadcast packet exists in the broadcast stream, it is configured by a header portion and a data portion in the null packet By compressing the compression target portion that is at least a part of the portion into a display information portion having a size smaller than the size of the compression target portion and indicating the null packet, the broadcast stream is compressed to convert the data signal And transmitting the data signal using the plurality of transmission packets.
　本発明の変換方法は、受信装置での変換方法であって、上記送信装置から送信された複数の伝送パケットを受信し、前記複数の伝送パケットから前記データ信号を取得し、前記データ信号内に前記表示情報部が存在する場合、当該表示情報部を、前記圧縮対象部分に変更することによって、前記データ信号を放送ストリームに変更する。 The conversion method of the present invention is a conversion method in a receiving apparatus, which receives a plurality of transmission packets transmitted from the transmitting apparatus, acquires the data signal from the plurality of transmission packets, and stores the data signal in the data signal When the display information part exists, the data signal is changed to a broadcast stream by changing the display information part to the compression target part.
　本発明によれば、伝送量を少なくでき、かつ、放送ストリームのフレーム構成を再構成することなく、受信装置が放送ストリームを再生することが可能となる。 According to the present invention, the amount of transmission can be reduced, and the receiving apparatus can reproduce the broadcast stream without reconfiguring the frame structure of the broadcast stream.
本発明の一実施形態の放送システムを示した図である。It is the figure which showed the broadcasting system of one Embodiment of this invention. 送信側ＴＳ変換装置を示した図である。It is the figure which showed the transmission side TS converter. 受信側ＴＳ変換装置を示した図である。It is the figure which showed the receiving side TS converter. 放送ＴＳパケットの構成を示した図である。It is the figure which showed the structure of the broadcast TS packet. 伝送ＴＳパケットの構成を示した図である。It is the figure which showed the structure of the transmission TS packet. 送信側TS変換装置１２で処理される放送TS、信号Aおよび信号Bを示した図である。FIG. 6 is a diagram showing a broadcast TS, a signal A, and a signal B that are processed by the transmission side TS converter 12. 受信側TS変換装置２２で処理される信号B’　信号A’および放送TSを示した図である。FIG. 5 is a diagram showing a signal B ′, a signal A ′, and a broadcast TS processed by the reception-side TS converter 22.
　以下、本発明の一実施形態について図面を参照して説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
　図１Ａは、本発明の実施形態に係る、衛星回線を用いた放送システムの一例を示した図である。放送システムは、送信局システム１と、受信局システム２と、衛星装置３と、を含む。放送システムは、一般的に通信システムと呼ぶことができる。送信局システム１は、一般的に送信装置と呼ぶことができる。受信局システム２は、一般的に受信装置と呼ぶことができる。 FIG. 1A is a diagram showing an example of a broadcasting system using a satellite line according to an embodiment of the present invention. The broadcasting system includes a transmitting station system 1, a receiving station system 2, and a satellite device 3. A broadcast system can generally be referred to as a communication system. The transmission station system 1 can generally be called a transmission device. The receiving station system 2 can be generally called a receiving device.
　図１Ａにおいて、送信局システム１は、ISDB-T　MUX（マルチプレクサ）装置１１と、送信側TS変換装置１２と、衛星回線送信機１３と、基準信号発生器１４と、を含む。 1A, the transmission station system 1 includes an ISDB-T MUX (multiplexer) device 11, a transmission side TS conversion device 12, a satellite line transmitter 13, and a reference signal generator 14.
　基準信号発生器１４は、GPS（Global　Positioning　System）同期型の基準信号発生器である。基準信号発生器１４は、GPS信号に同期した10MHzの基準信号を発生する。基準信号発生器１４は、10MHzの基準信号をISDB-T　MUX装置１１に出力する。 The reference signal generator 14 is a GPS (Global Positioning System) synchronous reference signal generator. The reference signal generator 14 generates a 10 MHz reference signal synchronized with the GPS signal. The reference signal generator 14 outputs a 10 MHz reference signal to the ISDB-T MUX device 11.
　ISDB-T　MUX装置１１は、地上デジタル放送用TS（Transport　Stream）多重化装置である。ISDB-T　MUX装置１１は、基準信号発生器１４から出力された10MHzの基準信号に同期したクロックを生成する。ISDB-T　MUX装置１１は、そのクロックに同期した32.5Mbps（パケットの大きさが204バイト形式）の放送TSを生成する。放送TSは、一般的に放送ストリームと呼ぶことができる。 The ISDB-T MUX device 11 is a TS (Transport Stream) multiplexing device for digital terrestrial broadcasting. The ISDB-T MUX device 11 generates a clock synchronized with the 10 MHz reference signal output from the reference signal generator 14. The ISDB-T MUX device 11 generates a broadcast TS of 32.5 Mbps (packet size is 204 bytes) synchronized with the clock. A broadcast TS can generally be called a broadcast stream.
　なお、ISDB-T　MUX装置１１にて生成される放送TSは、ISDB-T形式の放送TSである。ISDB-T形式の放送TSは、複数の情報（例えば、音声情報と映像情報とデータ情報）が多重化された多重フレームを構成要素とする。ISDB-T形式の放送TSでは、多重フレームは、複数の情報が多重化されたフレームを多重化することによって生成される。多重フレームは、一般的にフレームと呼ぶことができる。多重フレームは、複数の放送TSパケットにて構成される。放送TSパケットは、一般的に放送パケットと呼ぶことができる。 Note that the broadcast TS generated by the ISDB-T MUX device 11 is a broadcast TS in the ISDB-T format. The ISDB-T format broadcast TS includes a multiplexed frame in which a plurality of pieces of information (for example, audio information, video information, and data information) are multiplexed. In the ISDB-T format broadcast TS, a multiplex frame is generated by multiplexing a frame in which a plurality of pieces of information are multiplexed. Multiple frames can generally be referred to as frames. The multiplex frame is composed of a plurality of broadcast TS packets. A broadcast TS packet can be generally called a broadcast packet.
　図２Ａは、放送TSパケット４の構成を示した図である。 FIG. 2A is a diagram showing a configuration of the broadcast TS packet 4.
　図２Ａにおいて、放送TSパケット４は、0x47値（16進表示）、パケットID（PID）および連続性カウンタ値等の情報を示すTSヘッダ部４１と、アダプテーションフィールドとペイロードとからなる部分（以下「ペイロード部」と称する）４２と、ダミーバイト部４３と、で構成されている。 In FIG. 2A, a broadcast TS packet 4 includes a TS header portion 41 indicating information such as a 0x47 value (hexadecimal display), a packet ID (PID), and a continuity counter value, an adaptation field, and a payload (hereinafter “ (Referred to as “payload part”) 42 and a dummy byte part 43.
　TSヘッダ部４１は、一般的にヘッダ部と呼ぶことができる。ペイロード部４２は、一般的にデータ部と呼ぶことができる。ダミーバイト部４３は、一般的に付加情報部と呼ぶことができる。 The TS header portion 41 can generally be called a header portion. Payload portion 42 can be generally referred to as a data portion. Dummy byte portion 43 can generally be referred to as an additional information portion.
　TSヘッダ部４１のサイズは、4バイトである。ペイロード部４２のサイズは、184バイトである。ダミーバイト部４３のサイズは、16バイトである。このため、放送TSパケット４のサイズは、204バイトとなる。 The size of the TS header section 41 is 4 bytes. The size of the payload part 42 is 184 bytes. The size of the dummy byte part 43 is 16 bytes. For this reason, the size of the broadcast TS packet 4 is 204 bytes.
　ダミーバイト部４３の前8バイトには、ISDB-T方式で規定された制御情報が記述されている。この制御情報は、ISDB-T　Information（以下「II」と称する）と呼ばれる。この制御情報は、放送TSパケット４の階層を示す階層情報を含む。 In the 8 bytes before the dummy byte part 43, control information defined by the ISDB-T method is described. This control information is called ISDB-T Information (hereinafter referred to as “II”). This control information includes layer information indicating the layer of the broadcast TS packet 4.
　ダミーバイト部４３の残りの8バイトには、ISDB-T方式で規定された誤り訂正用情報が記述されている。誤り訂正用情報としては、Reed-Solomon（以下「RS」と称する）符号が用いられる。以下、ダミーバイト部をII+RS部とも称する。 In the remaining 8 bytes of the dummy byte section 43, error correction information defined by the ISDB-T method is described. As the error correction information, a Reed-Solomon (hereinafter referred to as “RS”) code is used. Hereinafter, the dummy byte part is also referred to as an II + RS part.
　図１Ａに示したISDB-T　MUX装置１１は、放送TSを送信側TS変換装置１２に出力する。 The ISDB-T MUX device 11 shown in FIG. 1A outputs the broadcast TS to the transmission side TS converter 12.
　なお、ISDB-T　MUX装置１１は、ペイロード部４２に載せるデータがないとき、Null（ヌル）パケットと呼ばれる伝送ビットレート調整用のパケットを、放送TSを構成するパケットつまり放送パケットとして、送信側TS変換装置１２に出力する。 Note that when there is no data to be loaded in the payload section 42, the ISDB-T MUX device 11 uses a transmission bit rate adjustment packet called a null packet as a packet constituting the broadcast TS, that is, a broadcast packet, as a transmission side TS. Output to the converter 12.
　放送TSを構成するNullパケットは、放送TSの構成要素である多重フレームの一部を構成する。放送TSを構成するNullパケットも、放送TSパケット４と同様に、サイズが4バイトのTSヘッダ部４１と、サイズが184バイトのペイロード部４２と、サイズが16バイトのII+RS部４３と、で構成される。 Null packets that make up a broadcast TS form part of a multiplex frame that is a component of the broadcast TS. Similarly to the broadcast TS packet 4, the Null packet constituting the broadcast TS also includes a TS header part 41 having a size of 4 bytes, a payload part 42 having a size of 184 bytes, an II + RS part 43 having a size of 16 bytes, Consists of.
　送信側TS変換装置１２は、放送TSを受け付けると、放送TSを伝送TSに変換する。伝送TSは、一般的に伝送ストリームと呼ぶことができる。伝送TSは、複数の伝送TSパケットにて構成される。伝送TSパケットは、一般的に伝送パケットと呼ぶことができる。 When receiving the broadcast TS, the transmission-side TS converter 12 converts the broadcast TS into a transmission TS. A transmission TS can be generally referred to as a transmission stream. The transmission TS is composed of a plurality of transmission TS packets. A transmission TS packet can be generally referred to as a transmission packet.
　図２Ｂは、伝送TSパケット５の構成を示した図である。 FIG. 2B is a diagram showing the configuration of the transmission TS packet 5.
　図２Ｂにおいて、伝送TSパケット５は、0x47値（16進表示）とPayload_unit_start_indicator値とを示す伝送用TSヘッダ部５１と、アダプテーションフィールドとペイロードとからなる部分（以下「ペイロード部」と称する）５２と、で構成されている。 In FIG. 2B, a transmission TS packet 5 includes a transmission TS header portion 51 indicating a 0x47 value (in hexadecimal notation) and a Payload_unit_start_indicator value, a portion (hereinafter referred to as a “payload portion”) 52 including an adaptation field and a payload. , Is composed of.
　伝送用TSヘッダ部５１は、一般的にヘッダ部と呼ぶことができる。ペイロード部５２は、一般的にデータ部と呼ぶことができる。 The transmission TS header 51 can be generally called a header. Payload portion 52 can generally be referred to as a data portion.
　伝送用TSヘッダ部５１のサイズは、4バイトである。ペイロード部５２のサイズは、184バイトである。このため、伝送TSパケット５のサイズは、188バイトとなる。 The size of the transmission TS header 51 is 4 bytes. The size of the payload part 52 is 184 bytes. For this reason, the size of the transmission TS packet 5 is 188 bytes.
　図１Ｂは、送信側TS変換装置１２を示したブロック図である。 FIG. 1B is a block diagram showing the TS converter 12 on the transmission side.
　図１Ｂにおいて、送信側TS変換装置１２は、放送TS同期部１２１と、Nullパケット圧縮部１２２と、伝送TSパケット化部１２３と、速度変換処理部１２４と、を含む。放送TS同期部１２１とNullパケット圧縮部１２２とは、生成部１２Ａに含まれる。生成部１２Ａは、一般的に生成手段と呼ぶことができる。伝送TSパケット化部１２３と速度変換処理部１２４と衛星回線送信機１３とは、送信部１２Ｂに含まれる。送信部１２Ｂは、一般的に送信手段と呼ぶことができる。 1B, the transmission-side TS conversion device 12 includes a broadcast TS synchronization unit 121, a null packet compression unit 122, a transmission TS packetization unit 123, and a speed conversion processing unit 124. Broadcast TS synchronization section 121 and null packet compression section 122 are included in generation section 12A. Generation unit 12A can be generally referred to as generation means. The transmission TS packetizing unit 123, the speed conversion processing unit 124, and the satellite line transmitter 13 are included in the transmission unit 12B. Transmitter 12B can generally be referred to as a transmission means.
　図３は、送信側TS変換装置１２で処理される放送TS、信号Aおよびを信号B示した図である。 FIG. 3 is a diagram showing a broadcast TS, a signal A, and a signal B that are processed by the transmission-side TS converter 12.
　図１Ｂに示した生成部１２Ａは、放送TS内に放送TSパケットの一種であるNullパケットが存在する場合、そのNullパケット内のTSヘッダ部（4バイト）４１およびペイロード部（184バイト）４２を、先頭表示バイト（1バイト）に変換することによって、放送TSを圧縮して、データ信号である信号Aを生成する。生成部１２Ａは、信号Aを送信部１２Ｂに出力する。 When a null packet which is a kind of broadcast TS packet exists in the broadcast TS, the generation unit 12A illustrated in FIG. 1B sets the TS header part (4 bytes) 41 and the payload part (184 bytes) 42 in the null packet. The broadcast TS is compressed by converting into the first display byte (1 byte), and the signal A which is a data signal is generated. The generation unit 12A outputs the signal A to the transmission unit 12B.
　なお、先頭表示バイトは、Nullパケットの先頭を表す0xB8値を示す。 The head display byte indicates a 0xB8 value indicating the head of the null packet.
　また、放送TSパケットであるNullパケット内のTSヘッダ部４１およびペイロード部４２で構成される部分は、圧縮対象部分と呼ぶことができる。圧縮対象部分は、放送TSパケットであるNullパケット内のTSヘッダ部４１およびペイロード部４２で構成される部分の少なくとも一部である。 In addition, a portion composed of the TS header portion 41 and the payload portion 42 in the Null packet that is a broadcast TS packet can be called a compression target portion. The compression target part is at least a part of a part constituted by the TS header part 41 and the payload part 42 in a Null packet that is a broadcast TS packet.
　送信部１２Ｂは、信号Aを複数の伝送TSパケットを用いて送信する。 The transmission unit 12B transmits the signal A using a plurality of transmission TS packets.
　放送TS同期部１２１は、放送TSの同期検出を行う。放送TS同期部１２１は、例えば、放送TSパケット４内のTSヘッダ部４１から0x47値を検出する。放送TS同期部１２１は、0x47値の検出タイミングに同期した同期信号を生成する。放送TS同期部１２１は、同期信号をNullパケット圧縮部１２２に出力する。 The broadcast TS synchronization unit 121 detects the synchronization of the broadcast TS. For example, the broadcast TS synchronization unit 121 detects the 0x47 value from the TS header unit 41 in the broadcast TS packet 4. The broadcast TS synchronization unit 121 generates a synchronization signal synchronized with the detection timing of the 0x47 value. Broadcast TS synchronization section 121 outputs a synchronization signal to Null packet compression section 122.
　Nullパケット圧縮部１２２は、放送TS（図３参照）内のNullパケットを圧縮して信号A（図３参照）を生成する。 The Null packet compression unit 122 compresses the Null packet in the broadcast TS (see FIG. 3) to generate a signal A (see FIG. 3).
　本実施形態では、Nullパケット圧縮部１２２は、放送TS同期部１２１からの同期信号に同期したタイミングで、放送TSパケット４のTSヘッダ部４１に記載された情報を読み出す。 In the present embodiment, the Null packet compression unit 122 reads information described in the TS header portion 41 of the broadcast TS packet 4 at a timing synchronized with the synchronization signal from the broadcast TS synchronization unit 121.
　Nullパケット圧縮部１２２は、TSヘッダ部４１に、Nullパケットを示すPIDが記載されていた場合、そのTSヘッダ部４１と、そのTSヘッダ部４１を含むパケット（つまり、Nullパケット）内のペイロード部４２を削除し、Nullパケットのうち残ったII+RS部４３に、先頭表示バイトを付加することによって、信号Aを生成する。 When the PID indicating the null packet is described in the TS header section 41, the null packet compression section 122 and the payload section in the packet including the TS header section 41 (that is, the null packet) 42 is deleted, and a signal A is generated by adding a head display byte to the remaining II + RS unit 43 of the null packet.
　なお、先頭表示バイトは、一般的に、Nullパケットを示す表示情報部と呼ぶことができる。先頭表示バイトのサイズは、1バイトである。このため、先頭表示バイトのサイズ（1バイト）は、NullパケットのTSヘッダ部４１とNullパケットのペイロード部４２との合計のサイズ（188バイト）よりも小さくなる。 Note that the head display byte can be generally called a display information portion indicating a null packet. The size of the first display byte is 1 byte. For this reason, the size (1 byte) of the head display byte is smaller than the total size (188 bytes) of the TS header part 41 of the null packet and the payload part 42 of the null packet.
　Nullパケット圧縮部１２２は、信号Aを伝送TSパケット化部１２３に出力する。 The Null packet compression unit 122 outputs the signal A to the transmission TS packetization unit 123.
　伝送TSパケット化部１２３は、信号Aを受け付けると、信号Aを、信号Aの先頭から184バイト単位、つまり、伝送TSパケット５のペイロード部５２のサイズに分割して、伝送TSパケット５のペイロード部５２を生成する。 When receiving the signal A, the transmission TS packetizing unit 123 divides the signal A into units of 184 bytes from the head of the signal A, that is, the size of the payload part 52 of the transmission TS packet 5, and the payload of the transmission TS packet 5 A part 52 is generated.
　伝送TSパケット化部１２３は、伝送TSパケット５のペイロード部５２のそれぞれに、新たに4バイトの伝送用TSヘッダ部５１を付加することによって、188バイトの伝送TSパケット５を生成する。伝送TSパケット化部１２３は、伝送TSパケット５にて構成される信号Bを生成する（図３参照）。 The transmission TS packetization unit 123 generates a 188-byte transmission TS packet 5 by newly adding a 4-byte transmission TS header 51 to each payload portion 52 of the transmission TS packet 5. The transmission TS packetizing unit 123 generates a signal B composed of the transmission TS packet 5 (see FIG. 3).
　なお、伝送TSパケット化部１２３は、ISDB-Tの多重フレーム内の先頭の放送TSパケット４のTSヘッダ部（以下「先頭TSヘッダ部」と称する）４１を、信号Bを構成するフレーム内の先頭の伝送TSパケット（以下「先頭伝送TSパケット」と称する）５のペイロード部５２の先頭位置に配置する。 The transmission TS packetizing unit 123 converts the TS header part (hereinafter referred to as “first TS header part”) 41 of the first broadcast TS packet 4 in the ISDB-T multiplex frame into the frame constituting the signal B. The first transmission TS packet (hereinafter referred to as “first transmission TS packet”) 5 is arranged at the head position of the payload portion 52.
　さらに、伝送TSパケット化部１２３は、先頭伝送TSパケット５内の伝送用TSヘッダ部５１中のPayload_unit_start_indicator値を“１”とし、先頭伝送TSパケットが、放送TSを構成する多重フレームの境界であることを示す。 Further, the transmission TS packetizing unit 123 sets the Payload_unit_start_indicator value in the transmission TS header 51 in the head transmission TS packet 5 to “1”, and the head transmission TS packet is a boundary between multiple frames constituting the broadcast TS. It shows that.
　伝送TSパケット化部１２３は、信号Bを速度変換処理部１２４に出力する。 The transmission TS packetizing unit 123 outputs the signal B to the speed conversion processing unit 124.
　速度変換処理部１２４は、信号Bのビットレートを伝送TS用のビットレートに変換するためにNullパケットを信号Bに挿入して伝送TSを生成する。速度変換処理部１２４は、伝送TSを衛星回線送信機１３に出力する。 The speed conversion processing unit 124 generates a transmission TS by inserting a null packet into the signal B in order to convert the bit rate of the signal B into a bit rate for the transmission TS. The speed conversion processing unit 124 outputs the transmission TS to the satellite line transmitter 13.
　衛星回線送信機１３は、伝送TSを受け付けると、伝送TSを衛星装置３に送信する。 Upon receiving the transmission TS, the satellite line transmitter 13 transmits the transmission TS to the satellite device 3.
　衛星装置３は、伝送TSを受信すると、伝送TSを受信局システム２に送信する。 When the satellite device 3 receives the transmission TS, it transmits the transmission TS to the receiving station system 2.
　受信局システム２は、衛星回線受信機２１と、受信側TS変換装置２２と、ISDB-T送信設備２３と、基準信号発生器２４と、を含む。 The receiving station system 2 includes a satellite line receiver 21, a receiving side TS converter 22, an ISDB-T transmission facility 23, and a reference signal generator 24.
　基準信号発生器２４は、GPS同期型の基準信号発生器である。基準信号発生器２４は、GPS信号に同期した10MHzの基準信号を発生する。基準信号発生器２４は、10MHzの基準信号を受信側TS変換装置２２に出力する。 The reference signal generator 24 is a GPS synchronous reference signal generator. The reference signal generator 24 generates a 10 MHz reference signal synchronized with the GPS signal. The reference signal generator 24 outputs a 10 MHz reference signal to the reception-side TS converter 22.
　衛星回線受信機２１は、一般的に受信手段と呼ぶことができる。衛星回線受信機２１は、衛星装置３から伝送TSを受信する。換言すると、衛星回線受信機２１は、衛星装置３から、複数の伝送TSパケット５を受信する。衛星回線受信機２１は、伝送TSを受信すると、伝送TSを受信側TS変換装置２２に出力する。 Satellite line receiver 21 can be generally referred to as receiving means. The satellite line receiver 21 receives the transmission TS from the satellite device 3. In other words, the satellite line receiver 21 receives a plurality of transmission TS packets 5 from the satellite device 3. When receiving the transmission TS, the satellite line receiver 21 outputs the transmission TS to the reception-side TS converter 22.
　受信側TS変換装置２２は、衛星回線受信機２１から受け付けた伝送TSと、基準信号発生器２４から出力される10MHzの基準信号と、を受け、10MHzの基準信号に同期した放送TSの伝送クロックを生成し、伝送TSから放送TSを復元する。 The receiving-side TS converter 22 receives the transmission TS received from the satellite line receiver 21 and the 10 MHz reference signal output from the reference signal generator 24, and transmits the broadcast TS transmission clock synchronized with the 10 MHz reference signal. And restore the broadcast TS from the transmission TS.
　図１Ｃは、受信側TS変換装置２２を示したブロック図である。 FIG. 1C is a block diagram showing the receiving-side TS converter 22.
　図１Ｃにおいて、受信側TS変換装置２２は、伝送TS同期部２２１と、速度変換処理部２２２と、伝送用TSヘッダ除去部２２３と、先頭表示バイトサーチ処理部２２４と、放送TSパケット化部２２５と、を含む。伝送TS同期部２２１と速度変換処理部２２２と伝送用TSヘッダ除去部２２３とは、取得部２２Ａと呼ぶことができる。取得部２２Ａは、一般的に取得手段と呼ぶことができる。先頭表示バイトサーチ処理部２２４と放送TSパケット化部２２５は、変更部２２Ｂと呼ぶことができる。変更部２２Ｂは、一般的に変更手段と呼ぶことができる。 1C, the receiving side TS converter 22 includes a transmission TS synchronization unit 221, a speed conversion processing unit 222, a transmission TS header removal unit 223, a head display byte search processing unit 224, and a broadcast TS packetization unit 225. And including. The transmission TS synchronization unit 221, the speed conversion processing unit 222, and the transmission TS header removal unit 223 can be referred to as an acquisition unit 22A. Acquisition unit 22A can be generally referred to as acquisition means. The head display byte search processing unit 224 and the broadcast TS packetizing unit 225 can be referred to as a changing unit 22B. Changing unit 22B can be generally referred to as changing means.
　図４は、受信側TS変換装置２２で処理される信号B’、信号A’および放送TSを示した図である。 FIG. 4 is a diagram showing a signal B ′, a signal A ′, and a broadcast TS processed by the reception side TS converter 22.
　図１Ｃに示した取得部２２Ａは、衛星回線受信機２１にて受信された複数の伝送TSパケットから信号Aを取得する。取得部２２Ａは、取得された信号Aを信号A’として変更部２２Ｂに出力する。 The acquiring unit 22A illustrated in FIG. 1C acquires the signal A from a plurality of transmission TS packets received by the satellite line receiver 21. The acquiring unit 22A outputs the acquired signal A as a signal A ′ to the changing unit 22B.
　変更部２２Ｂは、信号A’内に先頭表示バイトが存在する場合、その先頭表示バイトを、放送TSパケット４であるNullパケットのTSヘッダ部４１およびペイロード部４２に変更することによって、信号A’を放送TSに変更する。 When the head display byte is present in the signal A ′, the changing unit 22B changes the head display byte to the TS header part 41 and the payload part 42 of the Null packet that is the broadcast TS packet 4, thereby changing the signal A ′. Is changed to broadcasting TS.
　伝送TS同期部２２１は、伝送TSの同期検出を行う。伝送TS同期部２２１は、例えば、受信側TS変換装置２２に入力された伝送TS内の伝送用TSヘッダ部５１から0x47値を検出する。 The transmission TS synchronization unit 221 detects the synchronization of the transmission TS. For example, the transmission TS synchronization unit 221 detects the 0x47 value from the transmission TS header 51 in the transmission TS input to the reception-side TS converter 22.
　伝送TS同期部２２１は、0x47値の検出タイミングに同期した同期信号を生成する。伝送TS同期部２２１は、その同期信号を、速度変換処理部２２２に出力する。 The transmission TS synchronization unit 221 generates a synchronization signal synchronized with the detection timing of the 0x47 value. Transmission TS synchronization section 221 outputs the synchronization signal to speed conversion processing section 222.
　速度変換処理部２２２は、伝送TSと、伝送TS同期部２１１からの同期信号と、を受け付ける。速度変換処理部２２２は、伝送TS同期部２１１からの同期信号に同期したタイミングで、伝送TSパケット５の伝送用TSヘッダ部５１に記載された情報を読み出す。 The speed conversion processing unit 222 receives the transmission TS and the synchronization signal from the transmission TS synchronization unit 211. The speed conversion processing unit 222 reads information described in the transmission TS header 51 of the transmission TS packet 5 at a timing synchronized with the synchronization signal from the transmission TS synchronization unit 211.
　速度変換処理部２２２は、伝送用TSヘッダ部５１に記載されたPIDがNullパケットを示す場合、Nullパケットを示すPIDが記載された伝送用TSヘッダ部５１を有する伝送TSパケット、つまり、速度変換処理部１２４が伝送用ビットレートの変換時に挿入したNullパケットを、伝送TSから削除して、信号B’を生成する。なお、信号B’は、信号Bと同一内容を示す。 When the PID described in the transmission TS header 51 indicates a null packet, the speed conversion processing unit 222 transmits the transmission TS packet having the transmission TS header 51 in which the PID indicating the null packet is described, that is, the speed conversion. The Null packet inserted by the processing unit 124 when converting the transmission bit rate is deleted from the transmission TS to generate a signal B ′. The signal B ′ shows the same content as the signal B.
　速度変換処理部２２２は、信号B’内の伝送用TSヘッダ部５１から0x47値を検出し、0x47値の検出タイミングを示す同期情報を生成する。 The speed conversion processing unit 222 detects the 0x47 value from the transmission TS header unit 51 in the signal B ', and generates synchronization information indicating the detection timing of the 0x47 value.
　速度変換処理部２２２は、信号B’と同期情報とを、伝送用TSヘッダ除去部２２３に出力する。 The speed conversion processing unit 222 outputs the signal B ′ and the synchronization information to the transmission TS header removal unit 223.
　伝送用TSヘッダ除去部２２３は、信号B’と同期情報とを受信すると、同期情報にて示されたタイミングに同期して、信号B’内の伝送用TSヘッダ部５１からPayload_unit_start_indicator値を読み出し、Payload_unit_start_indicator値＝“１”を示す伝送用TSヘッダ部（以下「先頭伝送用TSヘッダ部」と称する）５１を検出する。 When receiving the signal B ′ and the synchronization information, the transmission TS header removal unit 223 reads the Payload_unit_start_indicator value from the transmission TS header unit 51 in the signal B ′ in synchronization with the timing indicated by the synchronization information, A transmission TS header portion (hereinafter referred to as “head transmission TS header portion”) 51 indicating Payload_unit_start_indicator value = “1” is detected.
　なお、先頭伝送用TSヘッダ部５１の直後には、先頭TSヘッダ部が配置されている。 Note that the head TS header portion is arranged immediately after the head header TS section 51 for transmission.
　このため、伝送用TSヘッダ除去部２２３は、先頭伝送用TSヘッダ部５１の検出結果を使用して、先頭伝送用TSヘッダ部５１の直後の先頭TSヘッダ部を特定する。 For this reason, the transmission TS header removal unit 223 uses the detection result of the head transmission TS header 51 to identify the head TS header immediately after the head transmission TS header 51.
　伝送用TSヘッダ除去部２２３は、その後、信号B’から伝送用TSヘッダ部５１を除去して、信号A’を生成する。 Thereafter, the transmission TS header removal unit 223 removes the transmission TS header 51 from the signal B ′ to generate a signal A ′.
　また、伝送用TSヘッダ除去部２２３は、先頭TSヘッダ部が信号A’内に存在する位置を特定するための特定情報を生成する。なお、特定情報としては、例えば、先頭TSヘッダ部が信号A’内に現れたときに“Ｈ”が現れる、信号A’に同期した信号が用いられる。 Also, the transmission TS header removal unit 223 generates specific information for specifying the position where the head TS header part is present in the signal A ′. As the specific information, for example, a signal synchronized with the signal A ′ in which “H” appears when the first TS header portion appears in the signal A ′ is used.
　伝送用TSヘッダ除去部２２３は、信号A’と特定情報とを、先頭表示バイトサーチ処理部２２４および放送TSパケット化部２２５に出力する。なお、放送TSパケット化部２２５には、信号A’が出力されればよく、特定情報は、放送TSパケット化部２２５に出力されなくてもよい。 The transmission TS header removal unit 223 outputs the signal A ′ and the specific information to the head display byte search processing unit 224 and the broadcast TS packetization unit 225. The broadcast TS packetizing unit 225 only needs to output the signal A ′, and the specific information may not be output to the broadcast TS packetizing unit 225.
　先頭表示バイトサーチ処理部２２４は、信号A’と特定情報とを受け付けると、特定情報にて信号A’内での位置が特定される先頭TSヘッダ部（ISDB-Tの多重フレームの先頭の放送TSパケットに含まれるTSヘッダ部）を、信号A’から検出する。 When the head display byte search processing unit 224 receives the signal A ′ and the specific information, the head TS header portion (the first broadcast of the ISDB-T multiplexed frame) whose position in the signal A ′ is specified by the specific information is received. The TS header part included in the TS packet) is detected from the signal A ′.
　先頭表示バイトサーチ処理部２２４は、先頭TSヘッダ部を検出すると、信号A’内の先頭TSヘッダ部の位置を特定する先頭TSヘッダ部位置情報を生成する。なお、先頭表示バイトサーチ処理部２２４は、伝送用TSヘッダ除去部２２３からの特定情報を、先頭TSヘッダ部位置情報として用いてもよい。 When the head display byte search processing unit 224 detects the head TS header part, it generates head TS header part position information for specifying the position of the head TS header part in the signal A ′. The head display byte search processing unit 224 may use the specific information from the transmission TS header removal unit 223 as head TS header part position information.
　また、先頭表示バイトサーチ部２２４は、先頭TSヘッダ部を基準に、それ以降のTSヘッダ部、および、0xB8値を持つ先頭表示バイトを検出する。先頭表示バイトサーチ部２２４は、その検出の結果を用いて、TSヘッダ部が信号A’内に存在する位置を特定するためのTSヘッダ部位置情報と、先頭表示バイトが信号A’内に存在する位置を特定するための先頭表示バイト位置情報と、を生成する。 Also, the head display byte search unit 224 detects the TS header part after that and the head display byte having a value of 0xB8 with reference to the head TS header part. The head display byte search unit 224 uses the detection result to identify the TS header part position information for identifying the position where the TS header part is present in the signal A ′, and the head display byte is present in the signal A ′. Head display byte position information for specifying the position to be generated.
　なお、TSヘッダ部位置情報としては、例えば、TSヘッダ部が信号A’内に現れたときに“Ｈ”となり信号A’に同期した信号が用いられる。また、先頭表示バイト位置情報としては、例えば、先頭表示バイトが信号A’内に現れたときに“Ｈ”となり信号A’に同期した信号が用いられる。 As the TS header portion position information, for example, a signal that becomes “H” when the TS header portion appears in the signal A ′ and is synchronized with the signal A ′ is used. As the head display byte position information, for example, a signal that becomes “H” when the head display byte appears in the signal A ′ and is synchronized with the signal A ′ is used.
　先頭表示バイトサーチ処理部２２４は、先頭TSヘッダ部位置情報とTSヘッダ部位置情報と先頭表示バイト位置情報とを、放送TSパケット化部２２５へ出力する。 The head display byte search processing unit 224 outputs the head TS header part position information, the TS header part position information, and the head display byte position information to the broadcast TS packetization unit 225.
　放送TSパケット化部２２５は、TSヘッダ部位置情報と先頭表示バイト位置情報とを用いて、信号A’と、TSヘッダ部位置情報および先頭表示バイト位置情報との同期状態を確認する。 The broadcast TS packetization unit 225 uses the TS header part position information and the head display byte position information to check the synchronization state of the signal A ′ and the TS header part position information and the head display byte position information.
　放送TSパケット化部２２５は、信号A’がTSヘッダ部位置情報および先頭表示バイト位置情報と同期している場合、先頭TSヘッダ部位置情報を元に、放送TSを構成する多重フレームの先頭位置を特定し、さらに、先頭表示バイト位置情報を元に、ISDB-T　MUX装置１１からの放送TS中に存在していたNullパケットを再生し、204バイト形式の32.5Mbpsの放送TSを復元する。 When the signal A ′ is synchronized with the TS header part position information and the head display byte position information, the broadcast TS packetization unit 225 uses the head TS header part position information to start the multiplexed frame starting position of the multiplexed TS. Further, based on the head display byte position information, the Null packet existing in the broadcast TS from the ISDB-T MUX device 11 is reproduced to restore the 32.5 Mbps broadcast TS in 204 byte format.
　このため、TSヘッダ部４１が4バイト、ペイロード部４２が184バイト、ダミーバイト部４３が16バイトの計204バイトで構成される放送TSパケットであるNullパケットが復元される。この結果、204バイト形式の放送TSを復元することができる。 Therefore, a null packet, which is a broadcast TS packet composed of a total of 204 bytes, in which the TS header portion 41 is 4 bytes, the payload portion 42 is 184 bytes, and the dummy byte portion 43 is 16 bytes, is restored. As a result, a 204-byte format broadcast TS can be restored.
　放送TSパケット化部２２５は、復元された放送TSを、ISDB-T　送信設備２３に出力する。 The broadcast TS packetization unit 225 outputs the restored broadcast TS to the ISDB-T transmission facility 23.
　ISDB-T　送信設備２３は、放送TSを受け付けると、放送TSをISDB-T方式の変調波に変換して地上デジタル放送用の信号を送信する。 When the ISDB-T transmission facility 23 receives the broadcast TS, the ISDB-T transmission facility 23 converts the broadcast TS into an ISDB-T modulated wave and transmits a signal for digital terrestrial broadcasting.
　なお、放送TSパケット化部２２５は、信号A’がTSヘッダ部位置情報および先頭表示バイト位置情報と同期していない場合、放送TSパケット化部２２５は、所定のエラー処理を行う。 The broadcast TS packetizing unit 225 performs a predetermined error process when the signal A ′ is not synchronized with the TS header part position information and the head display byte position information.
　次に、動作を説明する。 Next, the operation will be described.
　まず、送信側TS変換装置１２が放送TSを伝送TSに変換する動作を説明する。 First, an operation in which the transmission side TS converter 12 converts a broadcast TS into a transmission TS will be described.
　送信側TS変換装置１２に入力された放送TS（図３参照）は、放送TS同期部１２１によってTSヘッダ部４１から0x47値が検出され、その後、Nullパケット圧縮部１２２によって、放送TS内のNullパケットのTSヘッダ部４１（4バイト）とペイロード部４２（184バイト）が削除される。 The broadcast TS (see FIG. 3) input to the transmission-side TS converter 12 has a 0x47 value detected from the TS header unit 41 by the broadcast TS synchronization unit 121, and then the null packet compression unit 122 performs null in the broadcast TS. The TS header part 41 (4 bytes) and the payload part 42 (184 bytes) of the packet are deleted.
　Nullパケット圧縮部１２２は、残ったII+RS部４３（16バイト）に、先頭表示バイト（1バイト）を付加し、図３に示す信号Aを生成する。Nullパケット圧縮部１２２は、信号Aを伝送TSパケット化部１２３に出力する。 The Null packet compression unit 122 adds a head display byte (1 byte) to the remaining II + RS unit 43 (16 bytes) to generate a signal A shown in FIG. The Null packet compression unit 122 outputs the signal A to the transmission TS packetization unit 123.
　伝送TSパケット化部１２３は、信号Aを受け付けると、信号Aを、データの先頭から184バイト単位で分割して、伝送TSパケットのペイロード部５２を生成していく。伝送TSパケット化部１２３は、伝送TSパケットのペイロード部５２のそれぞれに、新たに伝送用TSヘッダ部５１（4バイト）を付加することによって、188バイトの伝送TSパケット５を生成し、伝送TSパケット５にて構成される信号B（図３参照）を生成する。 When the transmission TS packetization unit 123 receives the signal A, the transmission TS packetization unit 123 divides the signal A in units of 184 bytes from the beginning of the data, and generates a payload unit 52 of the transmission TS packet. The transmission TS packetization unit 123 generates a transmission TS packet 5 of 188 bytes by newly adding a transmission TS header 51 (4 bytes) to each of the payload parts 52 of the transmission TS packet. A signal B (see FIG. 3) composed of the packet 5 is generated.
　また、伝送TSパケット化部１２３は、先頭TSヘッダ部（ISDB-Tの多重フレーム内の先頭の放送TSパケット４のTSヘッダ部）４１を、先頭伝送TSパケット（信号Bを構成するフレーム内の先頭の伝送TSパケット）５のペイロード部５２の先頭位置に配置する。 Further, the transmission TS packetizing unit 123 converts the first TS header part (TS header part of the first broadcast TS packet 4 in the ISDB-T multiplex frame) 41 into the first transmission TS packet (in the frame constituting the signal B). It is arranged at the head position of the payload portion 52 of the head transmission TS packet) 5.
　続いて、伝送TSパケット化部１２３は、先頭伝送TSパケット５内の伝送用TSヘッダ部５１中のPayload_unit_start_indicator値を“１”とし、先頭伝送TSパケットが、放送TSを構成する多重フレームの境界であることを示す。 Subsequently, the transmission TS packetizing unit 123 sets the Payload_unit_start_indicator value in the transmission TS header 51 in the first transmission TS packet 5 to “1”, and the first transmission TS packet is at the boundary of the multiple frames constituting the broadcast TS. Indicates that there is.
　伝送TSパケット化部１２３は、信号Bを速度変換処理部１２４に出力する。 The transmission TS packetizing unit 123 outputs the signal B to the speed conversion processing unit 124.
　速度変換処理部１２４は、信号Bを受け付けると、信号Bのビットレートを伝送TS用のビットレートに変換するために、信号BにNullパケットを挿入して伝送TSを生成する。 When receiving the signal B, the speed conversion processing unit 124 generates a transmission TS by inserting a null packet into the signal B in order to convert the bit rate of the signal B into a bit rate for the transmission TS.
　この結果、204バイト形式の放送TSを、188バイト形式の伝送TSパケット用の伝送路で伝送可能な形に変換し、かつ、32.5Mbpsの伝送量を低減することができる。 As a result, it is possible to convert a 204-byte format broadcast TS into a form that can be transmitted through a transmission path for 188-byte format transmission TS packets, and to reduce the transmission amount of 32.5 Mbps.
　送信側TS変換装置１２で生成された伝送TSは、衛星回線送信機１３に出力され、衛星回線送信機１３から衛星装置３に送信される。衛星装置３は、伝送TSを衛星回線受信機２１に送信する。 The transmission TS generated by the transmission side TS converter 12 is output to the satellite line transmitter 13 and transmitted from the satellite line transmitter 13 to the satellite apparatus 3. The satellite device 3 transmits the transmission TS to the satellite line receiver 21.
　次に、受信側TS変換装置２２が伝送TSを放送TSに復元する動作を説明する。 Next, the operation in which the receiving side TS converter 22 restores the transmission TS to the broadcast TS will be described.
　受信側TS変換装置２２は、衛星回線受信機２１が受信した伝送TSを受け付ける。 The receiving-side TS converter 22 receives the transmission TS received by the satellite line receiver 21.
　伝送TS同期部２２１は、受信側TS変換装置２２に入力された伝送TS内の伝送用TSヘッダ部５１から0x47値を検出し、0x47値の検出タイミングに同期した同期信号を生成する。伝送TS同期部２２１は、同期信号を、速度変換処理部２２２に出力する。 The transmission TS synchronization unit 221 detects a 0x47 value from the transmission TS header 51 in the transmission TS input to the reception-side TS converter 22, and generates a synchronization signal synchronized with the detection timing of the 0x47 value. The transmission TS synchronization unit 221 outputs the synchronization signal to the speed conversion processing unit 222.
　速度変換処理部２２２は、受信側TS変換装置２２に入力された伝送TSと、伝送TS同期部２２１からの同期信号と、を受け付けると、伝送TSから、速度変換処理部１２４が伝送用ビットレートの変換時に挿入したNullパケットを削除し、図４に示す信号B’を生成する。 When the speed conversion processing unit 222 receives the transmission TS input to the reception-side TS conversion device 22 and the synchronization signal from the transmission TS synchronization unit 221, the speed conversion processing unit 124 transmits the transmission bit rate from the transmission TS. The null packet inserted at the time of conversion is deleted, and a signal B ′ shown in FIG. 4 is generated.
　速度変換処理部２２２は、信号B’を生成すると、信号B’内の伝送用TSヘッダ部５１から0x47値を検出し、0x47値の検出タイミングを示す同期情報を生成する。 When generating the signal B ′, the speed conversion processing unit 222 detects the 0x47 value from the transmission TS header unit 51 in the signal B ′, and generates synchronization information indicating the detection timing of the 0x47 value.
　速度変換処理部２２２は、信号B’と同期情報とを、伝送用TSヘッダ除去部２２３に出力する。 The speed conversion processing unit 222 outputs the signal B ′ and the synchronization information to the transmission TS header removal unit 223.
　伝送用TSヘッダ除去部２２３は、信号B’と同期情報とを受け付けると、同期情報にて示されたタイミングに同期して、信号B’内の伝送用TSヘッダ部５１からPayload_unit_start_indicator値を読み出し、Payload_unit_start_indicator値＝“１”を示す伝送用TSヘッダ部（先頭伝送用TSヘッダ部）５１を検出する。 When receiving the signal B ′ and the synchronization information, the transmission TS header removal unit 223 reads the Payload_unit_start_indicator value from the transmission TS header unit 51 in the signal B ′ in synchronization with the timing indicated by the synchronization information, A transmission TS header part (first transmission TS header part) 51 indicating Payload_unit_start_indicator value = “1” is detected.
　伝送用TSヘッダ除去部２２３は、先頭伝送用TSヘッダ部５１を検出すると、先頭伝送用TSヘッダ部の検出結果を使用して、先頭伝送用TSヘッダ部５１の直後の先頭TSヘッダ部を特定する。 When the transmission TS header removing unit 223 detects the leading transmission TS header 51, the transmission TS header removing unit 223 uses the detection result of the leading transmission TS header 51 to identify the leading TS header immediately after the leading transmission TS header 51. To do.
　その後、伝送用TSヘッダ除去部２２３は、信号B’から伝送用TSヘッダ部５１を除去して、信号A’を生成する。 Thereafter, the transmission TS header removal unit 223 removes the transmission TS header 51 from the signal B ′ to generate a signal A ′.
　伝送用TSヘッダ除去部２２３は、信号A’を作成すると、先頭TSヘッダ部が信号A’内に存在する位置を特定するための特定情報を生成する。 When the transmission TS header removal unit 223 creates the signal A ′, the transmission TS header removal unit 223 generates specific information for specifying the position where the leading TS header portion exists in the signal A ′.
　伝送用TSヘッダ除去部２２３は、特定情報を生成すると、信号A’と特定情報とを、先頭表示バイトサーチ処理部２２４および放送TSパケット化部２２５に出力する。 When the transmission TS header removal unit 223 generates the specific information, the transmission TS header removal unit 223 outputs the signal A ′ and the specific information to the head display byte search processing unit 224 and the broadcast TS packetization unit 225.
　先頭表示バイトサーチ処理部２２４は、信号A’と特定情報とを受け付けると、特定情報にて信号A’内での位置が特定される先頭TSヘッダ部（ISDB-Tの多重フレームの先頭の放送TSパケットに含まれるTSヘッダ部）を、信号A’から検出する。 When the head display byte search processing unit 224 receives the signal A ′ and the specific information, the head TS header portion (the first broadcast of the ISDB-T multiplexed frame) whose position in the signal A ′ is specified by the specific information is received. The TS header part included in the TS packet) is detected from the signal A ′.
　先頭表示バイトサーチ処理部２２４は、先頭TSヘッダ部を検出すると、先頭TSヘッダ部位置情報を生成する。 When the head display byte search processing unit 224 detects the head TS header part, it generates head TS header part position information.
　続いて、先頭表示バイトサーチ部２２４は、先頭TSヘッダ部を基準に、それ以降のTSヘッダ部、および、0xB8値を持つ先頭表示バイトを検出し、TSヘッダ部位置情報と先頭表示バイト位置情報とを生成する。 Subsequently, the head display byte search unit 224 detects the TS header part after that and the head display byte having the value 0xB8 with reference to the head TS header part, and TS header part position information and head display byte position information. And generate
　先頭表示バイトサーチ処理部２２４は、先頭TSヘッダ部位置情報とTSヘッダ部位置情報と先頭表示バイト位置情報とを、放送TSパケット化部２２５へ出力する。 The head display byte search processing unit 224 outputs the head TS header part position information, the TS header part position information, and the head display byte position information to the broadcast TS packetization unit 225.
　放送TSパケット化部２２５は、信号A’と特定情報と先頭TSヘッダ部位置情報とTSヘッダ部位置情報と先頭表示バイト位置情報とを受け付けると、TSヘッダ部位置情報と先頭表示バイト位置情報とを用いて、信号A’と、TSヘッダ部位置情報および先頭表示バイト位置情報と、の同期状態を確認する。 When receiving the signal A ′, the specific information, the head TS header part position information, the TS header part position information, and the head display byte position information, the broadcast TS packetization unit 225 receives the TS header part position information, the head display byte position information, and Is used to confirm the synchronization state of the signal A ′ with the TS header part position information and the head display byte position information.
　放送TSパケット化部２２５は、信号A’がTSヘッダ部位置情報および先頭表示バイト位置情報と同期している場合、先頭TSヘッダ部位置情報を元に、放送TSを構成する多重フレームの先頭位置を特定し、さらに、先頭表示バイト位置情報を元に、ISDB-T　MUX装置１１からの放送TS中に存在していたNullパケットを再生し、204バイト形式の32.5Mbpsの放送TSを復元する。 When the signal A ′ is synchronized with the TS header part position information and the head display byte position information, the broadcast TS packetization unit 225 uses the head TS header part position information to start the multiplexed frame starting position of the multiplexed TS. Further, based on the head display byte position information, the Null packet existing in the broadcast TS from the ISDB-T MUX device 11 is reproduced to restore the 32.5 Mbps broadcast TS in 204 byte format.
　本実施形態では、放送TSパケット化部２２５は、信号A’の先頭位置にTSヘッダ部が存在する場合は、TSヘッダ部を先頭位置としTSヘッダ部から204バイト目の箇所を最終位置とする信号を、信号A’から分割して、信号A’から分割された信号を、放送TSパケットとして扱う。 In this embodiment, the broadcast TS packetization unit 225, when the TS header part is present at the head position of the signal A ′, sets the TS header part as the head position and the 204th byte from the TS header part as the last position. The signal is divided from the signal A ′, and the signal divided from the signal A ′ is handled as a broadcast TS packet.
　また、放送TSパケット化部２２５は、放送TSパケットが分割された信号A’の先頭位置にTSヘッダ部が存在する場合は、TSヘッダ部を先頭位置としTSヘッダ部から204バイト目の箇所を最終位置とする信号を、信号A’から分割して、信号A’から分割された信号を、放送TSパケットとして扱う。 In addition, when the TS header part is present at the head position of the signal A ′ obtained by dividing the broadcast TS packet, the broadcast TS packetizing section 225 sets the TS header section as the head position and the 204th byte from the TS header section. The signal as the final position is divided from the signal A ′, and the signal divided from the signal A ′ is handled as a broadcast TS packet.
　また、放送TSパケット化部２２５は、信号A’の先頭位置に先頭表示バイトが存在する場合は、先頭表示バイトを削除し、NullパケットのPID（パケットＩＤ）を持つTSヘッダ部４１とペイロード部４２とを、信号A’の先頭箇所に付加する。放送TSパケット化部２２５は、先頭表示バイトの後部に付加されていたII+RS部４３をそのままとし、184バイト分の圧縮されていた無効データをペイロード部４２に格納する。放送TSパケット化部２２５は、NullパケットのPIDを持つTSヘッダ部４１と、無効データが格納されたペイロード部４２と、II+RS部４３と、からなるNullパケットを、放送TSパケットとして信号A’から分割する。 Also, the broadcast TS packetization unit 225 deletes the head display byte when the head display byte is present at the head position of the signal A ′, and the TS header section 41 having the PID (packet ID) of the null packet and the payload section. 42 is added to the head portion of the signal A ′. The broadcast TS packetization unit 225 stores the II + RS unit 43 added to the rear part of the head display byte as it is, and stores 184 bytes of compressed invalid data in the payload part 42. The broadcast TS packetization unit 225 converts a Null packet including a TS header unit 41 having a PID of a null packet, a payload unit 42 in which invalid data is stored, and an II + RS unit 43 into a signal A as a broadcast TS packet. Split from '.
　また、放送TSパケット化部２２５は、放送TSパケットが分割された信号A’の先頭位置に先頭表示バイトが存在する場合は、先頭表示バイトを削除し、NullパケットのPIDを持つTSヘッダ部４１とペイロード部４２とを、信号A’の先頭箇所に付加する。放送TSパケット化部２２５は、先頭表示バイトの後部に付加されていたII+RS部４３をそのままとし、184バイト分の圧縮されていた無効データをペイロード部４２に格納する。放送TSパケット化部２２５は、NullパケットのPIDを持つTSヘッダ部４１と、無効データが格納されたペイロード部４２と、II+RS部４３と、からなるNullパケットを、放送TSパケットとして信号A’から分割する。 Also, the broadcast TS packetization unit 225 deletes the head display byte when the head display byte exists at the head position of the signal A ′ obtained by dividing the broadcast TS packet, and the TS header unit 41 having the PID of the null packet. And the payload portion 42 are added to the head portion of the signal A ′. The broadcast TS packetization unit 225 stores the II + RS unit 43 added to the rear part of the head display byte as it is, and stores 184 bytes of compressed invalid data in the payload part 42. The broadcast TS packetizing unit 225 converts a null packet including a TS header unit 41 having a PID of a null packet, a payload unit 42 in which invalid data is stored, and an II + RS unit 43 into a broadcast TS packet as a signal A. Split from '.
　このため、204バイト形式の放送TSが復元される。 For this reason, a 204-byte broadcast TS is restored.
　なお、放送TSパケット化部２２５にて復元された放送TSについての伝送クロックは、送信局システム１の放送TS同様、GPS信号との同期が取られているため、ISDB-T　MUX装置１１が生成する伝送クロックと完全に同期する。 Note that the transmission clock for the broadcast TS restored by the broadcast TS packetization unit 225 is synchronized with the GPS signal in the same way as the broadcast TS of the transmission station system 1, and is generated by the ISDB-T MUX device 11. Fully synchronized with the transmission clock.
　また、放送TSパケット化部２２５が復元した放送TS（ISDB-Tの多重フレーム）内での各パケットの位置も、ISDB-T　MUX装置１１が生成した放送TS（ISDB-Tの多重フレーム）内での各パケットの位置と完全に一致する。 Also, the position of each packet in the broadcast TS (ISDB-T multiple frame) restored by the broadcast TS packetization unit 225 is also in the broadcast TS (ISDB-T multiple frame) generated by the ISDB-T MUX device 11. Exactly matches the position of each packet in
　このため、放送TSパケット化部２２５が復元した放送TSの構造（ISDB-Tの多重フレーム構造）も、ISDB-T　MUX装置１１が生成した放送TSの構造（ISDB-Tの多重フレーム構造）と完全に一致する。また、放送TSパケット化部２２５が復元した放送TSとISDB-T　MUX装置１１が生成した放送TSでは、PCRパケットの配置位置も同一となり、PCRパケット内のPCR値の補正も不要である。 Therefore, the structure of the broadcast TS (ISDB-T multiple frame structure) restored by the broadcast TS packetization unit 225 is the same as the structure of the broadcast TS generated by the ISDB-T MUX device 11 (ISDB-T multiple frame structure). Match exactly. In addition, in the broadcast TS restored by the broadcast TS packetization unit 225 and the broadcast TS generated by the ISDB-T MUX device 11, the arrangement positions of the PCR packets are the same, and it is not necessary to correct the PCR values in the PCR packets.
　受信側TS変換装置２２で復元された放送TSは、ISDB-T　送信設備２３に入力される。 The broadcast TS restored by the receiving side TS converter 22 is input to the ISDB-T transmission facility 23.
　本実施形態によれば、送信局システム１では、生成部１２Ａは、放送TS内に放送TSパケット４の一種であるNullパケットが存在する場合、そのNullパケット内のTSヘッダ部４１およびペイロード部４２、つまり、圧縮対象部分を、先頭表示バイトに変換することによって、放送TSを圧縮して、データ信号である信号Aを生成する。送信部１２Ｂは、信号Aを複数の伝送TSパケット５を用いて送信する。 According to the present embodiment, in the transmission station system 1, when a Null packet that is a kind of the broadcast TS packet 4 is present in the broadcast TS, the generation unit 12 </ b> A has a TS header part 41 and a payload part 42 in the Null packet. That is, the broadcast TS is compressed by converting the compression target portion into the head display byte, and the signal A which is a data signal is generated. The transmission unit 12B transmits the signal A using a plurality of transmission TS packets 5.
　このため、放送TS内のNullパケットが圧縮された状態で存在する信号Aが、複数の伝送TSパケットを用いて送信されることになる。よって、放送TS内のNullパケットが圧縮された状態で存在する放送TSが複数の伝送TSパケットを用いて送信される場合に比べて、伝送量の削減、および、伝送帯域の圧縮が可能になる。 For this reason, the signal A existing in a compressed state of the Null packet in the broadcast TS is transmitted using a plurality of transmission TS packets. Therefore, it is possible to reduce the amount of transmission and compress the transmission band compared to the case where a broadcast TS that exists in a compressed state of Null packets in the broadcast TS is transmitted using a plurality of transmission TS packets. .
　また、放送TS内のパケット数およびパケットの並びは、信号Aでも維持される。このため、放送TS内のパケットにて構成される多重フレームの構成は信号Aでも維持される。 Also, the number of packets and the sequence of packets in the broadcast TS are maintained even with the signal A. For this reason, the structure of the multiplex frame constituted by the packets in the broadcast TS is also maintained by the signal A.
　また、本実施形態では、受信局システム２では、衛星回線受信機２１は、送信局システム１から送信された複数の伝送TSパケット５を受信する。取得部２２Ａは、衛星回線受信機２１にて受信された複数の伝送TSパケット５から信号Aを取得し、信号Aを信号A’として出力する。変更部２２Ｂは、信号A’内に先頭表示バイトが存在する場合、先頭表示バイトを、放送TSパケット４であるNullパケットのTSヘッダ部４１およびペイロード部４２に変更することによって、信号A’を放送TSに変更する。 In this embodiment, in the receiving station system 2, the satellite line receiver 21 receives a plurality of transmission TS packets 5 transmitted from the transmitting station system 1. The acquiring unit 22A acquires the signal A from the plurality of transmission TS packets 5 received by the satellite line receiver 21, and outputs the signal A as the signal A '. When the head display byte is present in the signal A ′, the changing unit 22B changes the head display byte to the TS header part 41 and the payload part 42 of the Null packet that is the broadcast TS packet 4, thereby changing the signal A ′. Change to broadcast TS.
　上述したように放送TS内のパケット数およびパケットの並びは、信号Aでも維持される。このため、放送TS内のパケットにて構成される多重フレームの構成は信号Aでも維持される。よって、受信局システム２は、信号A内に存在する圧縮されたNullパケットを復元すれば、多重フレームの構成を考慮することなく放送TSを再生することが可能になる。 As described above, the number of packets and the arrangement of packets in the broadcast TS are also maintained by the signal A. For this reason, the structure of the multiplex frame constituted by the packets in the broadcast TS is also maintained by the signal A. Therefore, if the receiving station system 2 restores the compressed Null packet present in the signal A, it is possible to reproduce the broadcast TS without considering the configuration of the multiplexed frame.
　よって、受信局システム２が、伝送TSに基づいてフレーム構成パターンを再生成し、再生成されたフレーム構成パターンに基づいて、多重フレームを再構築する必要がなくなる。 Therefore, it is not necessary for the receiving station system 2 to regenerate the frame configuration pattern based on the transmission TS, and to reconstruct the multiplexed frame based on the regenerated frame configuration pattern.
　また、放送TS内のパケット数およびパケットの並びは、信号Aでも維持されるため、再生後の放送TS内のPCRパケットの多重位置も、元の放送TS内のPCRパケットの多重位置と同一となる。このため、送信局システム１および受信局システム２においてPCRパケット内の情報を補正するためのPCR補正回路を不要することができる。 In addition, since the number of packets and the arrangement of packets in the broadcast TS are also maintained in the signal A, the multiplexed position of the PCR packet in the broadcast TS after playback is the same as the multiplexed position of the PCR packet in the original broadcast TS. Become. This eliminates the need for a PCR correction circuit for correcting the information in the PCR packet in the transmitting station system 1 and the receiving station system 2.
　なお、上記実施形態では、伝送TSパケットのサイズを188バイトとしたが、伝送TSパケットのサイズは適宜変更可能であり、例えば、204バイトでもよい。 In the above embodiment, the size of the transmission TS packet is 188 bytes. However, the size of the transmission TS packet can be changed as appropriate, and may be 204 bytes, for example.
　また、上記実施形態では、放送TSとして、地上デジタル放送用の放送TSが用いられたが、放送TSは適宜変更可能であり、例えば、放送TSとして、BS/CSデジタル放送用の放送TSが用いられてもよい。 In the above embodiment, the broadcast TS for terrestrial digital broadcasting is used as the broadcast TS. However, the broadcast TS can be appropriately changed. For example, the broadcast TS for BS / CS digital broadcast is used as the broadcast TS. May be.
　また、上記実施形態では、地上デジタル放送用の放送TSとして、ISDB-T形式の放送TSが用いられたが、地上デジタル放送用の放送TSは適宜変更可能である。 In the above embodiment, the ISDB-T broadcast TS is used as the digital terrestrial broadcast TS. However, the digital terrestrial broadcast TS can be appropriately changed.
　また、上記実施形態の受信局システム２の代わりに、復元した放送TSを再送信する再送信システムが使用されてもよい。 Further, instead of the receiving station system 2 of the above embodiment, a retransmission system that retransmits the restored broadcast TS may be used.
　また、受信局システム２のISDB-T送信設備２３にてRS誤り訂正が不要な場合、Nullパケット圧縮部１２２は、Nullパケットの圧縮時、ダミーバイト部（16バイト）を全て残すのではなく、ダミーバイト部のうちISDB-T_information部（8バイト）のみを残してもよい。この場合、更なる伝送量の削減、および、更なる伝送帯域の圧縮が可能になる。 In addition, when RS error correction is not required in the ISDB-T transmission facility 23 of the receiving station system 2, the Null packet compression unit 122 does not leave all dummy byte parts (16 bytes) when compressing Null packets. Only the ISDB-T_information part (8 bytes) may be left out of the dummy byte part. In this case, it is possible to further reduce the transmission amount and further compress the transmission band.
　また、本実施形態では、ISDB-Tの多重フレームの先頭パケットが、伝送TS内のフレーム内の先頭パケットのペイロードに来るようにしたが、ISDB-Tの多重フレームの先頭パケットと伝送TS内のフレーム内の先頭パケットとの関係は上記に限るものではない。 Also, in this embodiment, the top packet of the ISDB-T multiplex frame comes to the payload of the top packet in the frame in the transmission TS, but the top packet of the ISDB-T multiplex frame and the packet in the transmission TS The relationship with the first packet in the frame is not limited to the above.
　例えば、任意の間隔で、放送TSのTSヘッダ部が、伝送TSの伝送用TSヘッダ部の直後に来るように配置され、かつ、放送TSのTSヘッダ部が直後に来る伝送用TSヘッダ部中のPayload_unit_start_indicator値を“１”にしてもよい。 For example, in an arbitrary interval, the TS header part of the broadcast TS is arranged immediately after the transmission TS header part of the transmission TS, and the TS header part of the broadcast TS immediately follows the transmission TS header part. The Payload_unit_start_indicator value may be set to “1”.
　また、本実施形態では、衛星装置３を介して伝送TSが伝送されたが、伝送TSは、衛星装置３を介さずに伝送されてもよい。 In this embodiment, the transmission TS is transmitted via the satellite device 3, but the transmission TS may be transmitted without the satellite device 3.
　また、本実施形態では、送信局システム１はISDB-T　NUX装置１１と基準信号発生器１４とを有したが、送信局システム１はISDB-T　NUX装置１１と基準信号発生器１４を有さず、送信局システム１内の送信側TS変換装置１２が、外部のISDB-T　NUX装置１１から放送TSを受け付けてもよい。 In this embodiment, the transmission station system 1 has the ISDB-T NUX device 11 and the reference signal generator 14, but the transmission station system 1 has the ISDB-T NUX device 11 and the reference signal generator 14. Instead, the transmission-side TS conversion device 12 in the transmission station system 1 may receive a broadcast TS from the external ISDB-T NUX device 11.
　また、本実施形態では、圧縮対象部分として、放送TSパケットの一種であるNullパケット内のTSヘッダ部４１およびペイロード部４２で構成される部分が用いられたが、圧縮対象部分は適宜変更可能である。例えば、圧縮対象部分として、放送TSパケットの一種であるNullパケット内のTSヘッダ部４１のみが用いられてもよいし、また、放送TSパケットの一種であるNullパケット内のTSヘッダ部４１とペイロード部４２の一部とを併せた部分が用いられてもよい。 Further, in this embodiment, a part composed of the TS header part 41 and the payload part 42 in the Null packet which is a kind of broadcast TS packet is used as the compression target part. However, the compression target part can be changed as appropriate. is there. For example, only the TS header part 41 in the Null packet that is a kind of broadcast TS packet may be used as the compression target part, or the TS header part 41 and the payload in the Null packet that is a kind of broadcast TS packet. A part combined with a part of the part 42 may be used.
　なお、本実施形態は、衛星回線、FPU（Field　Pickup　Unit）回線など、各種回線を用いた地上デジタル放送TSまたはBS/CSデジタル放送TSの伝送システムに利用することが可能である。 Note that this embodiment can be used for a transmission system for a terrestrial digital broadcasting TS or a BS / CS digital broadcasting TS using various lines such as a satellite line and an FPU (Field Pickup Unit) line.
　以上、実施形態を参照して本願発明を説明したが、本願発明は上記実施形態に限定されるものではない。本願発明の構成や詳細には、本願発明のスコープ内で当業者が理解し得る様々な変更をすることができる。 The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
　この出願は、２０１０年２月２５日に出願された日本出願特願２０１０－０４０１２０を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims priority based on Japanese Patent Application No. 2010-040120 filed on February 25, 2010, the entire disclosure of which is incorporated herein.
　　　１　　　送信局システム
　　　１１　　ISDB-T　MUX装置
　　　１２　　送信側TS変換装置
　　　１２Ａ　生成部
　　　１２Ｂ　送信部
　　　１２１　放送TS同期部
　　　１２２　Nullパケット圧縮部
　　　１２３　伝送TSパケット化部
　　　１２４　速度変換処理部
　　　１３　　衛星回線送信機
　　　１４　　基準信号発生器
　　　２　　　受信局システム
　　　２１　　衛星回線受信機
　　　２２　　受信側TS変換装置
　　　２２Ａ　取得部
　　　２２Ｂ　変更部
　　　２２１　伝送TS同期部
　　　２２２　速度変換処理部
　　　２２３　伝送用TSヘッダ除去部
　　　２２４　先頭表示バイトサーチ処理部
　　　２２５　放送TSパケット化部
　　　２３　　ISDB-T送信設備
　　　２４　　基準信号発生器
　　　３　　　衛星装置 DESCRIPTION OF SYMBOLS 1 Transmission station system 11 ISDB-T MUX apparatus 12 Transmission side TS conversion apparatus 12A Generation part 12B Transmission part 121 Broadcast TS synchronization part 122 Null packet compression part 123 Transmission TS packetization part 124 Speed conversion process part 13 Satellite line transmitter 14 Reference | standard Signal generator 2 Receiving station system 21 Satellite line receiver 22 Receiving side TS converter 22A Acquisition unit 22B Changing unit 221 Transmission TS synchronization unit 222 Speed conversion processing unit 223 Transmission TS header removal unit 224 Leading display byte search processing unit 225 Broadcasting TS packetization part 23 ISDB-T transmission equipment 24 Reference signal generator 3 Satellite equipment

Claims (9)

  1. 　ヘッダ部とデータ部と付加情報部からなる放送パケットにて構成されたフレームを構成要素とする放送ストリームを圧縮してデータ信号を生成し、当該データ信号を複数の伝送パケットを用いて送信する送信装置であって、
    　前記放送ストリーム内に前記放送パケットの一種であるヌルパケットが存在する場合、当該ヌルパケット内のヘッダ部およびデータ部にて構成される部分の少なくとも一部である圧縮対象部分を、当該圧縮対象部分のサイズよりも小さいサイズを有し前記ヌルパケットを示す表示情報部に変換することによって、前記放送ストリームを圧縮して前記データ信号を生成する生成手段と、
    　前記データ信号を前記複数の伝送パケットを用いて送信する送信手段と、を含む送信装置。     A transmission that generates a data signal by compressing a broadcast stream including a frame composed of a broadcast packet including a header part, a data part, and an additional information part, and transmits the data signal using a plurality of transmission packets. A device,
    When a null packet that is a kind of the broadcast packet exists in the broadcast stream, a compression target portion that is at least a part of a portion composed of a header portion and a data portion in the null packet is changed to the compression target portion. Generating means for compressing the broadcast stream and generating the data signal by converting into a display information part having a size smaller than
    And a transmission unit that transmits the data signal using the plurality of transmission packets.
  2. 　前記圧縮対象部分は、前記ヌルパケット内のヘッダ部およびデータ部にて構成される部分である、請求項１に記載の送信装置。 The transmission apparatus according to claim 1, wherein the compression target part is a part configured by a header part and a data part in the null packet.
  3. 　前記付加情報部には、ISDB-T方式で規定された制御情報と、前記ISDB-T方式で規定された誤り訂正用情報と、が記述されており、
    　前記生成手段は、前記放送ストリーム内に前記ヌルパケットが存在する場合、前記圧縮対象部分を前記表示情報部に変換し、かつ、当該ヌルパケット内の付加情報部のうち前記誤り訂正用情報が記述された部分を削除することによって、前記放送ストリームを圧縮して前記データ信号を生成する、請求項１または２に記載の送信装置。     In the additional information part, control information defined by the ISDB-T system and error correction information defined by the ISDB-T system are described,
    When the null packet is present in the broadcast stream, the generation unit converts the compression target portion into the display information portion, and the error correction information is described in the additional information portion in the null packet. The transmission apparatus according to claim 1 or 2, wherein the data signal is generated by compressing the broadcast stream by deleting the recorded portion.
  4. 　請求項１から３のいずれか１項に記載の送信装置から送信された複数の伝送パケットを受信する受信手段と、
    　前記受信手段にて受信された複数の伝送パケットから前記データ信号を取得する取得手段と、
    　前記取得手段にて取得されたデータ信号内に前記表示情報部が存在する場合、当該表示情報部を、前記圧縮対象部分に変更することによって、前記データ信号を放送ストリームに変更する変更手段と、を含む受信装置。     Receiving means for receiving a plurality of transmission packets transmitted from the transmitting device according to any one of claims 1 to 3,
    Obtaining means for obtaining the data signal from a plurality of transmission packets received by the receiving means;
    When the display information portion is present in the data signal acquired by the acquisition means, changing means for changing the data signal to a broadcast stream by changing the display information portion to the compression target portion; Including a receiving device.
  5. 　請求項１から３のいずれか１項に記載の送信装置と、請求項４に記載の受信装置と、を含む通信システム。 A communication system including the transmission device according to any one of claims 1 to 3 and the reception device according to claim 4.
  6. 　ヘッダ部とデータ部と付加情報部からなる放送パケットにて構成されたフレームを構成要素とする放送ストリームを圧縮してデータ信号を生成し、当該データ信号を複数の伝送パケットを用いて送信する送信装置での送信方法であって、
    　前記放送ストリーム内に前記放送パケットの一種であるヌルパケットが存在する場合、当該ヌルパケット内のヘッダ部およびデータ部にて構成される部分の少なくとも一部である圧縮対象部分を、当該圧縮対象部分のサイズよりも小さいサイズを有し前記ヌルパケットを示す表示情報部に変換することによって、前記放送ストリームを圧縮して前記データ信号を生成し、
    　前記データ信号を前記複数の伝送パケットを用いて送信する、送信方法。     Transmission that generates a data signal by compressing a broadcast stream including a frame composed of a broadcast packet including a header part, a data part, and an additional information part, and transmits the data signal using a plurality of transmission packets A transmission method in a device,
    When a null packet that is a kind of the broadcast packet exists in the broadcast stream, a compression target portion that is at least a part of a portion composed of a header portion and a data portion in the null packet is changed to the compression target portion. The data stream is generated by compressing the broadcast stream by converting it into a display information part indicating a null packet having a size smaller than the size of
    A transmission method of transmitting the data signal using the plurality of transmission packets.
  7. 　前記圧縮対象部分は、前記ヌルパケット内のヘッダ部およびデータ部にて構成される部分である、請求項６に記載の送信方法。 The transmission method according to claim 6, wherein the compression target part is a part constituted by a header part and a data part in the null packet.
  8. 　前記付加情報部には、ISDB-T方式で規定された制御情報と、前記ISDB-T方式で規定された誤り訂正用情報と、が記述されており、
    　前記生成することは、前記放送ストリーム内に前記ヌルパケットが存在する場合、前記圧縮対象部分を前記表示情報部に変換し、かつ、当該ヌルパケット内の付加情報部のうち前記誤り訂正用情報が記述された部分を削除することによって、前記放送ストリームを圧縮して前記データ信号を生成することを含む、請求項６または７に記載の送信方法。     In the additional information part, control information defined by the ISDB-T system and error correction information defined by the ISDB-T system are described,
    When the null packet is present in the broadcast stream, the generating converts the portion to be compressed into the display information portion, and the error correction information is included in the additional information portion in the null packet. The transmission method according to claim 6 or 7, comprising compressing the broadcast stream to generate the data signal by deleting a described portion.
  9. 　受信装置での変換方法であって、
    　請求項１から３のいずれか１項に記載の送信装置から送信された複数の伝送パケットを受信し、
    　前記複数の伝送パケットから前記データ信号を取得し、
    　前記データ信号内に前記表示情報部が存在する場合、当該表示情報部を、前記圧縮対象部分に変更することによって、前記データ信号を放送ストリームに変更する、変換方法。     A conversion method in a receiving device,
    Receiving a plurality of transmission packets transmitted from the transmission device according to any one of claims 1 to 3,
    Obtaining the data signal from the plurality of transmission packets;
    When the display information part is present in the data signal, the conversion method of changing the data signal to a broadcast stream by changing the display information part to the compression target part.
PCT/JP2011/053129 2010-02-25 2011-02-15 Transmission device, reception device, communication system, transmission method, and conversion method WO2011105250A1 (en)

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