WO2014155927A1 - Broadcast apparatus, transmission method, and broadcast system - Google Patents

Broadcast apparatus, transmission method, and broadcast system Download PDF

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Publication number
WO2014155927A1
WO2014155927A1 PCT/JP2014/000606 JP2014000606W WO2014155927A1 WO 2014155927 A1 WO2014155927 A1 WO 2014155927A1 JP 2014000606 W JP2014000606 W JP 2014000606W WO 2014155927 A1 WO2014155927 A1 WO 2014155927A1
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WIPO (PCT)
Prior art keywords
packets
tot
time difference
packet
unit
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PCT/JP2014/000606
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French (fr)
Japanese (ja)
Inventor
白石　憲一
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株式会社Ｊｖｃケンウッド
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Publication of WO2014155927A1 publication Critical patent/WO2014155927A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
    • 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
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]

Definitions

  • the present invention relates to a transmission technique, and more particularly to a broadcasting apparatus, a transmission method, and a broadcasting system that transmit a predetermined signal.
  • MPEG Motion Picture Coding Experts Group
  • OFDM Orthogonal Frequency Division Multiplexing
  • SFN Single Frequency Network
  • the packet indicating the reference time is also multiplexed, and based on this, timing synchronization between transmitting stations is performed (for example, Patent Document 1).
  • Area one-segment broadcasting (also called one-segment type area broadcasting) uses one-segment broadcasting, which is one of terrestrial digital broadcasting, and is limited to a narrow area with transmission power that is lower than the transmission power used by broadcasters. It is a service that transmits content data.
  • time synchronization between the broadcasting devices is required.
  • SFN operation in area one-segment broadcasting installation work for installing a dedicated line is difficult to secure the installation location and financially.
  • reference synchronization using a reference signal of another system such as GPS (Global Positioning System) is preferable to a complete synchronization method or a subordinate synchronization method in which data or a clock using a dedicated line is distributed from a master broadcasting device.
  • the reference synchronization is stipulated in the operational guidelines of the terrestrial digital broadcasting standard.
  • the TS packet of the invalid layer includes the time difference information from the reference time in the TS packet of the invalid layer. Is arranged.
  • Area One-segment broadcasting broadcasting equipment is required to have cost close to consumer equipment and low running cost. Therefore, it is necessary to transmit MPEG2-TS (hereinafter simply referred to as TS) distributed over a network in a necessary minimum state. Therefore, area one-segment broadcasting uses only TS packets transmitted from a broadcasting device, not a TS remultiplexing format conscious of hierarchical transmission used in full-segment broadcasting and 12-segment broadcasting, which are general terrestrial digital broadcasting. There is no TS packet in the invalid layer. Since there is no invalid layer TS packet, information for synchronizing with the GPS cannot be shared between the broadcasting apparatuses, and timing synchronization is not realized.
  • MPEG2-TS hereinafter simply referred to as TS
  • the present invention has been made in view of such a situation, and an object thereof is to provide a technique capable of efficiently realizing timing synchronization between broadcasting apparatuses.
  • a broadcasting apparatus includes an acquisition unit that acquires a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse.
  • a generation unit that generates a plurality of TS packets to be arranged between frame pulses acquired by the acquisition unit, a transmission unit that transmits the plurality of TS packets generated by the generation unit to another broadcasting device, and a generation unit
  • a modification unit that transforms a TOT packet among the plurality of TS packets and a broadcast unit that broadcasts a plurality of TS packets including the TOT packet modified by the modification unit as an OFDM signal are provided.
  • the generation unit includes information on a time difference between the TOT packet and the reference timing pulse in a predetermined area of the TOT packet, and the deformation unit removes information on the time difference from the predetermined area of the TOT packet, and instead of the information on the time difference.
  • the error detection data is inserted into a predetermined area of the TOT packet, and the other broadcasting apparatus that has received the plurality of TS packets transmitted by the transmission unit removes the time difference information from the predetermined area of the TOT packet. Instead, error detection data is inserted into a predetermined area of the TOT packet.
  • Another aspect of the present invention is also a broadcasting device.
  • a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse are defined, and a plurality of TS packets arranged between the frame pulses are transmitted through OFDM.
  • a receiving unit that receives signals from other broadcasting devices as a signal, a deforming unit that modifies a TOT packet among a plurality of TS packets received by the receiving unit, and a plurality of TS packets in which the deforming unit modifies the TOT packet as an OFDM signal.
  • a broadcasting section for broadcasting for broadcasting.
  • the predetermined area of the TOT packet among the plurality of TS packets received by the receiving unit includes information on the time difference between the TOT packet and the reference timing pulse, and the deforming unit displays the information on the time difference from the predetermined area of the TOT packet.
  • error detection data is inserted into a predetermined area of the TOT packet instead of the time difference information, and the broadcasting unit broadcasts a plurality of TS packets as OFDM signals according to the time difference information.
  • Still another aspect of the present invention is a transmission method.
  • This method includes a step of acquiring a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse, and a plurality of TS packets to be arranged between the acquired frame pulses.
  • Generating a plurality of TS packets a step of transmitting a plurality of generated TS packets to another broadcasting device, a step of modifying a TOT packet among the generated plurality of TS packets, and a plurality of TS packets obtained by modifying the TOT packet Broadcasting as an OFDM signal.
  • the generating step includes information on the time difference between the TOT packet and the reference timing pulse in a predetermined region of the TOT packet among the plurality of TS packets, and the step of modifying removes the information on the time difference from the predetermined region of the TOT packet.
  • the error detection data is inserted into the predetermined area of the TOT packet instead of the time difference information
  • the transmission step receives the plurality of TS packets transmitted from the predetermined area of the TOT packet. The information is removed and error detection data is inserted into a predetermined area of the TOT packet instead of the time difference information.
  • Still another aspect of the present invention is also a transmission method.
  • a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse are defined, and a plurality of TS packets arranged between the frame pulses are transmitted by OFDM.
  • Receiving as a signal from another broadcasting device transforming a TOT packet among the received TS packets, and broadcasting a plurality of TS packets modified from the TOT packet as OFDM signals.
  • the predetermined region of the TOT packet among the plurality of TS packets received by the receiving step includes information on the time difference between the TOT packet and the reference timing pulse, and the step of modifying the time difference from the predetermined region of the TOT packet
  • a plurality of TS packets are broadcast as OFDM signals according to the time difference information.
  • Still another aspect of the present invention is a broadcasting system.
  • This broadcasting system acquires a reference timing pulse having a predetermined cycle and a frame pulse having a cycle different from the cycle of the reference timing pulse, and a plurality of TS packets to be arranged between the acquired frame pulses.
  • the plurality of generated TS packets are transmitted to the slave broadcasting device, and the TOT packet of the generated plurality of TS packets is transformed and broadcast as an OFDM signal, and received from the main broadcasting device
  • a slave broadcast device that transforms the TOT packet of the plurality of TS packets and broadcasts it as an OFDM signal.
  • the main broadcast device includes (1) information on a time difference between the TOT packet and a reference timing pulse in a predetermined area of the TOT packet among a plurality of TS packets for transmission, and (2) a TOT packet for broadcast.
  • the time difference information is removed from the predetermined area, and error detection data is inserted into the predetermined area of the TOT packet in place of the time difference information.
  • the slave broadcasting device (1) obtains the time difference information from the predetermined area of the TOT packet. At the same time, error detection data is inserted into a predetermined area of the TOT packet instead of the time difference information, and (2) a plurality of TS packets are broadcast as OFDM signals according to the time difference information.
  • FIGS. 4A and 4B are diagrams showing the format of the TOT packet generated in the main broadcast apparatus of FIG.
  • FIGS. 4A and 4B are diagrams showing the format of the TOT packet generated in the main broadcast apparatus of FIG.
  • FIG. 4A and 4B are diagrams showing the format of the TOT packet generated in the main broadcast apparatus of FIG.
  • FIG. 4A and 4B are diagrams showing the format of the TOT packet generated in the main broadcast apparatus of FIG.
  • FIG. 4A and 4B are diagrams showing the format of the TOT packet generated in the main broadcast apparatus of FIG.
  • FIG. 4A and 4B are diagrams showing the format of the TOT packet generated in the main broadcast apparatus of FIG.
  • FIG. 4A and 4B are diagrams showing the format of the TOT packet generated in the main broadcast apparatus of FIG.
  • FIG. 4A and 4B are diagrams showing the format of the TOT packet generated in the main broadcast apparatus of FIG.
  • FIG. 4A and 4B are diagrams showing the format of the TOT packet generated in
  • An embodiment of the present invention relates to an area one segment broadcasting system for transmitting an OFDM signal including content data in order to realize a content distribution service in area one segment broadcasting.
  • the area one segment broadcasting system includes a plurality of broadcasting devices, and signals broadcast from them are received by a receiving device.
  • signals having the same contents are broadcast from a plurality of broadcasting devices and the timings between the broadcasting devices are synchronized.
  • the broadcasting apparatus executes the following processing.
  • broadcasting devices There are two types of broadcasting devices in this embodiment.
  • One is a broadcast device that receives content data to be broadcast from an AV encoder, broadcasts an OFDM signal including the content data, and transmits the content data to another type of broadcast device (hereinafter referred to as “main broadcast device”).
  • the other is a broadcasting device (hereinafter referred to as a “subordinate broadcasting device”) that receives content data from the main broadcasting device and broadcasts an OFDM signal including the content data, as described above.
  • the timing of the slave broadcasting device is synchronized with the timing of the main broadcasting device.
  • the main broadcast device and the sub broadcast device generate a 1 pps pulse synchronized with the GPS timing based on the received signal at the GPS.
  • the main broadcasting device generates a plurality of MPEG2-TS packets (hereinafter sometimes simply referred to as packets) for storing content data and the like.
  • packets MPEG2-TS packets
  • TOT Time Offset Table
  • TOT packets are arranged at predetermined intervals. Specifically, TOT packets are arranged at intervals of 5 seconds, for example. Time information indicating the current date and time is inserted into the TOT packet. Therefore, in the case of being arranged at intervals of 5 seconds, the inserted time information is also a value every 5 seconds.
  • CRC Cyclic Redundancy Check
  • CRC Cyclic Redundancy Check
  • the main broadcast apparatus first stores information on the time difference between the timing of the TOT packet and the 1 pps pulse without storing the CRC data in a predetermined area in which the CRC data is to be stored.
  • the master broadcast device transmits a plurality of packets including such TOT packets to the slave broadcast device. This transmission is performed by other than SFN.
  • the slave broadcast device receives a plurality of packets, the slave broadcast device extracts the TOT packet and executes timing synchronization with the main broadcast device based on the time difference information stored in the predetermined area.
  • the main broadcast apparatus and the sub broadcast apparatus convert a plurality of packets into OFDM signals and broadcast. At that time, the time difference information is removed from the predetermined area of the TOT packet, and the normal CRC data is stored. This broadcast is made by SFN.
  • FIG. 1 shows a configuration of an area one segment broadcasting system 100 according to an embodiment of the present invention.
  • the area one segment broadcasting system 100 includes a main broadcasting device 10, a first GPS module 12, a HUB 14, a PC 16, a first wireless device 18, an AV encoder 20, a slave broadcasting device 30, a second GPS module 32, a second wireless device 34, and a receiving device. 40 is included. Further, an SFN area 50 is formed by the main broadcast device 10 and the sub broadcast device 30.
  • one slave broadcast device 30 is shown, but a plurality of slave broadcast devices 30 may be included in the area one segment broadcast system 100.
  • the first GPS module 12 receives a signal from a GPS satellite, thereby acquiring time information and a 1 pps pulse. Since a known technique may be used for these acquisitions, description thereof is omitted here.
  • the 1 pps pulse is a reference timing pulse having a period of 1 second.
  • the first GPS module 12 outputs time information and a 1 pps pulse to the main broadcast device 10.
  • the first GPS module 12 may acquire position information, but the description thereof is omitted here.
  • the AV encoder 20 encodes the moving image audio data, multiplexes data broadcasting and SI (Service Information) / PSI (Program Specific Information) with the encoded moving image audio data, and generates a TS. Output to.
  • the PC 16 controls the TS to be output from the AV encoder 20 via the HUB 14.
  • the HUB 14 is connected to the main broadcast device 10, the PC 16, the AV encoder 20, and the first radio device 18, and relays TS, data, control signals, and the like. Communication via the HUB 14 is performed by, for example, IP (Internet Protocol).
  • the main broadcast device 10 acquires time information and 1 pps pulse from the first GPS module 12. Also, the main broadcast device 10 acquires a TS from the AV encoder 20 via the HUB 14. The main broadcast device 10 obtains internally generated frame pulses. Here, the frame pulse has a period different from the period of the 1 pps pulse. The period of the frame pulse is, for example, 0.231336 seconds.
  • the main broadcast device 10 generates a plurality of packets to be arranged between frame pulses. Here, some of the plurality of packets are TOT packets. TOT packets are arranged at intervals of 5 seconds, for example.
  • the TOT packet includes information on the time difference between the TOT packet and the 1 pps pulse as well as the current time information as described above.
  • the main broadcast device 10 transmits a plurality of packets to the first wireless device 18 via the HUB 14.
  • the first wireless device 18 outputs a plurality of packets to the second wireless device 34.
  • Communication between the first wireless device 18 and the second wireless device 34 is performed by, for example, a wireless LAN (Local Area Network) or a wireless (Metropolitan Area Network) wireless WAN (Wide Area Network).
  • the first radio apparatus 18 and the second radio apparatus 34 may communicate via a base station apparatus (not shown). Since the second radio apparatus 34 outputs a plurality of packets to the slave broadcast apparatus 30, the above processing corresponds to transmitting the generated plurality of packets to the slave broadcast apparatus 30.
  • the master broadcast device 10 transforms some of the plurality of packets transmitted to the slave broadcast device 30. More specifically, the main broadcast apparatus 10 removes the time difference information from the predetermined area of the TOT packet and inserts CRC data into the predetermined area of the TOT packet instead of the time difference information.
  • the main broadcast device 10 broadcasts the deformed packets to the SFN area 50 as OFDM signals.
  • the main broadcast device 10 broadcasts after delaying the plurality of packets in order to match the transmission timing with the plurality of packets broadcast from the sub broadcast device 30.
  • the slave broadcast device 30 acquires time information and a 1 pps pulse from the second wireless device 34. In addition, the slave broadcast device 30 acquires a plurality of packets from the second wireless device 34. The sub broadcast device 30 transforms some of the plurality of packets received from the main broadcast device 10. More specifically, the slave broadcast device 30 removes time difference information from the TOT packet and inserts CRC data into the TOT packet instead of the time difference information. The slave broadcast device 30 broadcasts a plurality of modified packets to the SFN area 50 according to the time difference information.
  • the clocks of the main broadcast device 10 and the sub broadcast device 30 are based on 1 pps pulse, and the frame pulse is based on 1 pps pulse at a predetermined cycle selected by a TOT detection decoding unit described later among the 1 pps pulses.
  • FIGS. 2A to 2D show timings in the area one segment broadcasting system 100.
  • FIG. 2A shows a 1 pps pulse, which goes high at 1 second intervals.
  • FIG. 2B shows a frame pulse, which goes high at intervals of 0.231336 seconds.
  • FIG. 2C shows a plurality of TS packets arranged between frame pulses. As shown in the figure, 64 TS packets are arranged between adjacent frame pulses. From these relationships, the period in which the phases of the 1 pps pulse and the frame pulse overlap is 28917 seconds.
  • FIG. 2D shows a 1 MHz clock.
  • the phase difference of the frame pulse is expressed with respect to the phase of the 1 pps pulse with the resolution of 10 MHz clock.
  • the phase difference is expressed by using the 1 MHz clock.
  • FIG. 3 shows the configuration of the main broadcast device 10.
  • the main broadcast device 10 includes a LAN interface unit 200, a CPU 202, a TOT detection unit 204, a first TS number counting unit 206, a second acquisition unit 208, a clock count unit 210, a second generation unit 212, a first acquisition unit 214, a real time clock.
  • the CPU 202 includes a transmission unit 240 and a first generation unit 242.
  • the first acquisition unit 214 acquires a 1 pps pulse by receiving a 1 pps pulse from the first GPS module 12.
  • the second acquisition unit 208 acquires a frame pulse.
  • the second acquisition unit 208 generates a frame pulse based on the 1 pps pulse. Since a known technique may be used for generating the frame pulse, the description thereof is omitted here.
  • the LAN interface unit 200 is connected to the HUB 14 and receives a TS from the HUB 14 as an IP packet.
  • the transmission rate of the TS matches the transmission rate of the main broadcast device 10.
  • the real time clock unit 216 generates an interrupt signal at intervals of 5 seconds from the first GPS module 12 according to the time information based on the 1 pps pulse.
  • the real time clock unit 216 outputs an interrupt signal to the CPU 202 and the TOT detection decoding unit 220.
  • the real-time clock unit 216 outputs a 1 pps pulse to the CPU 202, the second generation unit 212, and the clock count unit 210.
  • the first generation unit 242 receives the TS from the LAN interface unit 200 and the interrupt signal from the real-time clock unit 216.
  • the first generation unit 242 multiplexes TOT packets between a plurality of TS packets by an interrupt signal at intervals of 5 seconds. Since the priority of multiplexing is lower than that of the AV stream, the TOT packet is set at an interval of about 5 seconds.
  • the time of the TOT packet is based on the standard of the time when the receiving device 40 receives it, the preceding time is inserted when the TOT packet is multiplexed. Therefore, the TOT packet and the 1 pps phase are usually separated to some extent.
  • the first generation unit 242 generates a plurality of packets to be arranged between the frame pulses.
  • the TOT detection unit 204 detects a TOT packet from the plurality of packets from the first generation unit 242, and outputs the detected timing to the first TS number counting unit 206.
  • the first TS number counting unit 206 receives a detection notification from the TOT detection unit 204 and receives a plurality of packets from the first generation unit 242. Based on these, the first TS number counting unit 206 measures the number of packets between the TOT packet and the frame pulse. This corresponds to the TS number of the phase difference between the TOT packet and the frame pulse.
  • the clock count unit 210 receives a 1 pps pulse from the real time clock unit 216 and a frame pulse from the second acquisition unit 208. Based on these, the clock count unit 210 measures the number of clocks between the frame pulse and the 1 pps pulse. A 1 MHz clock is used for this measurement.
  • the second generation unit 212 receives a plurality of packets from the first generation unit 242, the number of packets from the first TS number count unit 206, the number of clocks from the clock count unit 210, and the frame pulse from the second acquisition unit 208.
  • the second generation unit 212 includes a combination of the number of packets and the number of clocks as time difference information in a TOT packet that is a part of a plurality of packets.
  • FIG. 4 (a)-(b) show the format of the TOT packet generated in the main broadcast apparatus 10.
  • FIG. 4A shows the format of a normal TOT packet.
  • the TOT packet is composed of, for example, 188 bytes, and a TS header is arranged in the first 4 bytes.
  • Time information is inserted into the payload, and CRC data for error checking for the time information is inserted into the 32-bit CRC data area.
  • FIG. 4B shows the format of the TOT packet generated by the second generation unit 212.
  • information on the time difference between the timing of the TOT packet and the 1 pps pulse is inserted in a 32-bit area (predetermined area) in which CRC data is to be inserted in the normal TOT packet.
  • the packet number information is inserted into an 11-bit area in a 32-bit area.
  • the 11 bits are set because the maximum value of TS packets specified for TOT packets transmitted at intervals of about 5 seconds is the number of TSs 1384 (in some cases 1383) transmitted in 5 seconds. This is because the number of bits that can represent the value of 1384 is 11 bits.
  • clock number information is inserted into an 18-bit area of the 32-bit area.
  • the reason for 18 bits is that when the time difference from the frame pulse is designated by the number of clocks for the designated TS, the maximum number of clocks in the frame interval is 231336 clocks, and the number of bits that can represent 231336 is 18 bits. Because.
  • the mode information is inserted into the 2-bit area of the 32-bit area.
  • the mode information includes, for example, information indicating whether or not the packet number information and the clock number information are included in the 32-bit area. Is included.
  • the initial value of the frame is inserted into the remaining 1-bit area of the 32-bit area.
  • the initial value of the frame is 1-bit information of TMCC differential demodulation that is inverted every frame. Such a configuration is made possible by using a 1 MHz clock in this embodiment. For example, when the number of clocks is expressed using a 10 MHz clock, 22 bits are required as the clock number information, and the sum of the packet number information and the clock number information becomes larger than 32 bits. Clock number information cannot be included in the TOT packet instead of CRC data.
  • the transmission unit 240 outputs the plurality of packets generated by the second generation unit 212 to the LAN interface unit 200. As a result, the plurality of packets are transmitted to the slave broadcasting device 30 via the HUB 14, the first wireless device 18, and the second wireless device 34.
  • the buffer memory 230 stores the plurality of packets from the second generation unit 212 in order to delay the broadcast timing of the plurality of packets according to the transmission delay from the transmission unit 240 to the slave broadcasting device 30. This process will be described in detail.
  • the TOT detection decoding unit 220 After the TOT detection decoding unit 220 detects the TOT packet, it selects the 1 pps pulse corresponding to the time information described in the TOT packet, that is, immediately after obtaining this time information.
  • the write address control unit 226 sets the address of the buffer memory 230 and stores subsequent packets in order.
  • the clock generator 218 generates a 1 MHz clock based on the 1 pps pulse.
  • the OFDM frame count unit 224 reads the number of frame clocks from the TOT packet detected by the TOT detection decoding unit 220.
  • the OFDM frame count unit 224 generates an OFDM frame pulse at a position corresponding to the number of clocks described in the TOT packet with reference to the phase of the selected 1 pps pulse.
  • Second TS number counting section 222 counts the number of packets based on the phase of the selected 1 pps pulse and the OFDM frame pulse, and matches the phase of the frame period.
  • the read address control unit 228 reads a plurality of packets from the buffer memory 230 according to the count numbers in the second TS number counting unit 222 and the OFDM frame counting unit 224.
  • the deformation unit 232 deforms some of the plurality of packets from the buffer memory 230. Some of the packets to be modified are TOT packets. More specifically, the deforming unit 232 removes the time difference information from the predetermined area of the TOT packet and inserts CRC data into the predetermined area of the TOT packet instead of the time difference information. This corresponds to transforming FIG. 4B to FIG. 4A.
  • the broadcast unit 234 broadcasts a plurality of packets obtained by modifying the TOT packet by the modification unit 232 as OFDM signals.
  • the slave broadcast device 30 that has received the plurality of packets transmitted by the transmitter 240 also removes the time difference information from the predetermined area of the TOT packet and inserts CRC data into the predetermined area of the TOT packet instead of the time difference information. To do.
  • the slave broadcast device 30 broadcasts a plurality of packets obtained by modifying the TOT packets as OFDM signals according to the time difference information.
  • This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of any computer, and in terms of software, it can be realized by a program loaded in the memory, but here it is realized by their cooperation.
  • Draw functional blocks Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.
  • FIG. 5 shows the configuration of the slave broadcast device 30.
  • the slave broadcast device 30 includes a LAN interface unit 300, a CPU 302, an acquisition unit 314, a real-time clock unit 316, a clock generation unit 318, a TOT detection decoding unit 320, a TS number counting unit 322, an OFDM frame counting unit 324, and a write address control unit 326. , A read address control unit 328, a buffer memory 330, a deformation unit 332, and a broadcast unit 334.
  • the CPU 302 includes a receiving unit 340.
  • the receiving unit 340 receives a plurality of packets from the second wireless device 34 via the LAN interface unit 300. This corresponds to receiving a plurality of packets from the main broadcast device 10. As described above, the plurality of packets include the TOT packet, but the format is the same as that in FIG.
  • the buffer memory 330 stores a plurality of packets received by the receiving unit 340.
  • the acquisition unit 314, the real-time clock unit 316, the clock generation unit 318, the TOT detection decoding unit 320, the TS number counting unit 322, the OFDM frame counting unit 324, the write address control unit 326, and the read address control unit 328 are illustrated in FIG.
  • the acquisition unit 214 Since it is the same as the acquisition unit 214, the real-time clock unit 216, the clock generation unit 218, the TOT detection decoding unit 220, the second TS number counting unit 222, the OFDM frame counting unit 224, the write address control unit 226, and the read address control unit 228, The description is omitted here.
  • the deforming unit 332 removes time difference information from a predetermined area of the TOT packet among a plurality of packets received by the receiving unit 340, and converts CRC data into the TOT packet information instead of the time difference information. Insert into a predetermined area. As a result, some of the plurality of packets are deformed.
  • the broadcast unit 234 broadcasts a plurality of packets obtained by modifying the TOT packet by the modification unit 232 as OFDM signals.
  • the plurality of packets are broadcast according to the time difference information included in the TOT packet. Therefore, the broadcast timing of the slave broadcast device 30 is synchronized with the broadcast timing of the main broadcast device 10.
  • FIG. 6 is a sequence diagram showing a broadcasting procedure by the area one segment broadcasting system 100.
  • the main broadcast device 10 inserts time difference information into a predetermined area of the TOT packet (S10).
  • the main broadcast device 10 transmits a plurality of packets as OFDM signals (S12).
  • the plurality of packets are transmitted from the main broadcast device 10 to the sub broadcast device 30 (S14).
  • the main broadcast device 10 and the sub broadcast device 30 exclude the time difference information from the predetermined area of the TOT packet (S16, S18).
  • the main broadcast device 10 and the sub broadcast device 30 insert CRC data in a predetermined area of the TOT packet (S20, S22).
  • the main broadcast device 10 and the sub broadcast device 30 broadcast a plurality of packets as OFDM signals (S24, S26).
  • the information on the time difference is included instead of the CRC data in the TOT packet, an instruction regarding synchronization can be transmitted efficiently.
  • timing synchronization between broadcasting apparatuses can be efficiently realized. Since the time difference information is transmitted to the slave broadcast device, the timing can be synchronized with the slave broadcast device. Further, since the number of packets and the number of clocks are transmitted as time difference information, the amount of time difference information can be reduced. Also, since the time difference information is removed from the TOT packet and CRC data is inserted instead, the broadcast reception characteristics can be improved. In addition, since time difference information is received from the main broadcast device, timing synchronization with the main broadcast device can be performed efficiently.
  • timing synchronization can be realized efficiently, it is possible to construct an SFN that is low cost and does not burden the network line.
  • information on the time difference based on the clock that can efficiently express the relationship between the 1 pps pulse and the frame pulse selected by the time used as the reference for synchronization is included in the TOT packet, so it is invalid. Therefore, it is not necessary to use the TS remultiplexing format for transmitting the hierarchical layer TS, and the packet transmission efficiency can be improved.
  • the area one segment broadcast system 100 executes one segment broadcast.
  • these may execute a plurality of segment broadcasts.
  • An example of the plurality of segment broadcasts is a full segment broadcast and a three segment broadcast. According to this modification, the present invention can be applied to various broadcasts.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

A first generation unit (242) and a second generation unit (212) each generate a plurality of packets to be arranged between acquired frame pulses. The second generation unit (212) incorporates, into each of TOT packets that are some of the plurality of packets, information of time difference between the TOT packet and a reference timing pulse. A transmission unit (240) transmits the plurality of generated packets to another broadcast apparatus. A transformation unit (232) transforms some of the plurality of generated packets. The transformation unit (232) removes the information of time difference from each of TOT packets that are some of the plurality of packets, and inserts, into the TOT packet, error detection data instead of the information of time difference. A broadcast unit (234) broadcasts the plurality of packets some of which have been transformed.

Description

放送装置、伝送方法、放送システムBroadcast apparatus, transmission method, broadcast system
　本発明は、伝送技術に関し、特に所定の信号を送信する放送装置、伝送方法、放送システムに関する。 The present invention relates to a transmission technique, and more particularly to a broadcasting apparatus, a transmission method, and a broadcasting system that transmit a predetermined signal.
　地上デジタル放送方式では、ＭＰＥＧ（Ｍｏｖｉｎｇ　Ｐｉｃｔｒｕｒｅ　Ｃｏｄｉｎｇ　Ｅｘｐｅｒｔｓ　Ｇｒｏｕｐ）２－ＴＳ（Ｔｒａｎｓｐｏｒｔ　Ｓｔｒｅａｍ）が採用されているとともに、ＯＦＤＭ（Ｏｒｔｈｏｇｏｎａｌ　Ｆｒｅｑｕｅｎｃｙ　Ｄｉｖｉｓｉｏｎ　Ｍｕｌｔｉｐｌｅｘｉｎｇ）も採用されている。さらに、地上デジタル放送方式では、同一の周波数を利用するＳＦＮ（Ｓｉｎｇｌｅ　Ｆｒｅｑｕｅｎｃｙ　Ｎｅｔｗｏｒｋ）放送が採用されている。ＳＦＮ放送において伝送路毎に距離が異なり、複数の送信所にＭＰＥＧ２－ＴＳパケットを分配伝送する場合、各送信所の発した電波が受信点に到着する時刻の差が大きくなると、受信特性が悪化する。これに対応するために、基準時刻が示されたパケットも多重化され、これをもとに送信所間のタイミング同期が実行される（例えば、特許文献１）。 In the digital terrestrial broadcasting system, MPEG (Moving Picture Coding Experts Group) 2-TS (Transport Stream) is adopted, and OFDM (Orthogonal Frequency Division Multiplexing) is also adopted. Furthermore, in the digital terrestrial broadcasting system, SFN (Single Frequency Network) broadcasting using the same frequency is adopted. In SFN broadcasting, when the transmission distance is different for each transmission path and MPEG2-TS packets are distributed and transmitted to a plurality of transmitting stations, the reception characteristics deteriorate when the difference in time at which the radio waves emitted from the transmitting stations arrive at the receiving point becomes large. To do. In order to cope with this, the packet indicating the reference time is also multiplexed, and based on this, timing synchronization between transmitting stations is performed (for example, Patent Document 1).
特開２００３－３２２０７号公報JP 2003-32207 A
　エリアワンセグメント放送（ワンセグメント型エリア放送とも呼ぶ）とは、地上デジタル放送のひとつであるワンセグメント放送を利用し、放送事業者によって使用される送信電力よりも小さい送信電力によって、狭いエリアに限定的にコンテンツデータを送信するサービスである。このようなエリアワンセグメント放送において複数の放送装置から信号を送信する場合、放送装置間のタイミング同期が必要とされる。エリアワンセグメント放送におけるＳＦＮ運用において、専用線を架設する設置工事は架設場所の確保や財政的に困難である。そのため、専用線を使用するデータやクロックをマスター放送装置から配信する完全同期方式や従属同期方式より、ＧＰＳ（Ｇｌｏｂａｌ　Ｐｏｓｉｔｉｏｎｉｎｇ　Ｓｙｓｔｅｍ）などの別システムの基準信号を使用するリファレンス同期の方が好ましい。リファレンス同期は、地上デジタル放送の規格の運用ガイドラインに規定されており、ＧＰＳの１ｐｐｓ信号に同期させるため無効階層のＴＳパケットに、基準時刻との時間差情報などが含められ、当該無効階層のＴＳパケットが配置されている。 Area one-segment broadcasting (also called one-segment type area broadcasting) uses one-segment broadcasting, which is one of terrestrial digital broadcasting, and is limited to a narrow area with transmission power that is lower than the transmission power used by broadcasters. It is a service that transmits content data. When transmitting signals from a plurality of broadcasting devices in such area one segment broadcasting, timing synchronization between the broadcasting devices is required. In SFN operation in area one-segment broadcasting, installation work for installing a dedicated line is difficult to secure the installation location and financially. For this reason, reference synchronization using a reference signal of another system such as GPS (Global Positioning System) is preferable to a complete synchronization method or a subordinate synchronization method in which data or a clock using a dedicated line is distributed from a master broadcasting device. The reference synchronization is stipulated in the operational guidelines of the terrestrial digital broadcasting standard. In order to synchronize with the GPS 1pps signal, the TS packet of the invalid layer includes the time difference information from the reference time in the TS packet of the invalid layer. Is arranged.
　エリアワンセグメント放送の放送装置には、民生機器に近いコストおよび低ランニングコストが求められている。そのため、ネットワークで配信するＭＰＥＧ２－ＴＳ（以下、単にＴＳと呼ぶ）も必要最小限の状態で伝送する必要がある。したがって、エリアワンセグメント放送は、一般的な地上デジタル放送であるフルセグメント放送や１２セグメント放送で用いられる階層伝送を意識したＴＳ再多重フォーマットではなく、放送装置から送信されるＴＳパケットのみを用いるので、無効階層のＴＳパケットが存在しない。無効階層のＴＳパケットが存在しないので、ＧＰＳに同期させるための情報を各放送装置で共有できず、タイミング同期が実現されない。 Area One-segment broadcasting broadcasting equipment is required to have cost close to consumer equipment and low running cost. Therefore, it is necessary to transmit MPEG2-TS (hereinafter simply referred to as TS) distributed over a network in a necessary minimum state. Therefore, area one-segment broadcasting uses only TS packets transmitted from a broadcasting device, not a TS remultiplexing format conscious of hierarchical transmission used in full-segment broadcasting and 12-segment broadcasting, which are general terrestrial digital broadcasting. There is no TS packet in the invalid layer. Since there is no invalid layer TS packet, information for synchronizing with the GPS cannot be shared between the broadcasting apparatuses, and timing synchronization is not realized.
　本発明はこうした状況に鑑みてなされたものであり、その目的は、放送装置間のタイミング同期を効率よく実現できる技術を提供することである。 The present invention has been made in view of such a situation, and an object thereof is to provide a technique capable of efficiently realizing timing synchronization between broadcasting apparatuses.
　上記課題を解決するために、本発明のある態様の放送装置は、所定の周期を有した基準タイミングパルスと、基準タイミングパルスの周期とは異なった周期を有したフレームパルスとを取得する取得部と、取得部が取得したフレームパルス間に配置すべき複数のＴＳパケットを生成する生成部と、生成部が生成した複数のＴＳパケットを他の放送装置に送信する送信部と、生成部が生成した複数のＴＳパケットのうちのＴＯＴパケットを変形させる変形部と、変形部が変形したＴＯＴパケットを含む複数のＴＳパケットをＯＦＤＭ信号として放送する放送部とを備える。生成部は、ＴＯＴパケットの所定領域に、当該ＴＯＴパケットと基準タイミングパルスとの時間差の情報を含め、変形部は、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、送信部が送信した複数のＴＳパケットを受信した他の放送装置に、ＴＯＴパケットの所定領域から時間差の情報を除去させるとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入させる。 In order to solve the above problems, a broadcasting apparatus according to an aspect of the present invention includes an acquisition unit that acquires a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse. A generation unit that generates a plurality of TS packets to be arranged between frame pulses acquired by the acquisition unit, a transmission unit that transmits the plurality of TS packets generated by the generation unit to another broadcasting device, and a generation unit A modification unit that transforms a TOT packet among the plurality of TS packets and a broadcast unit that broadcasts a plurality of TS packets including the TOT packet modified by the modification unit as an OFDM signal are provided. The generation unit includes information on a time difference between the TOT packet and the reference timing pulse in a predetermined area of the TOT packet, and the deformation unit removes information on the time difference from the predetermined area of the TOT packet, and instead of the information on the time difference. The error detection data is inserted into a predetermined area of the TOT packet, and the other broadcasting apparatus that has received the plurality of TS packets transmitted by the transmission unit removes the time difference information from the predetermined area of the TOT packet. Instead, error detection data is inserted into a predetermined area of the TOT packet.
　本発明の別の態様もまた、放送装置である。この装置は、所定の周期を有した基準タイミングパルスと、基準タイミングパルスの周期とは異なった周期を有したフレームパルスとが規定されており、フレームパルス間に配置された複数のＴＳパケットをＯＦＤＭ信号として他の放送装置から受信する受信部と、受信部が受信した複数のＴＳパケットのうちのＴＯＴパケットを変形させる変形部と、変形部がＴＯＴパケットを変形した複数のＴＳパケットをＯＦＤＭ信号として放送する放送部とを備える。受信部が受信した複数のＴＳパケットのうちのＴＯＴパケットの所定領域には、当該ＴＯＴパケットと基準タイミングパルスとの時間差の情報が含まれ、変形部は、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、放送部は、時間差の情報に応じて、複数のＴＳパケットをＯＦＤＭ信号として放送する。 Another aspect of the present invention is also a broadcasting device. In this apparatus, a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse are defined, and a plurality of TS packets arranged between the frame pulses are transmitted through OFDM. A receiving unit that receives signals from other broadcasting devices as a signal, a deforming unit that modifies a TOT packet among a plurality of TS packets received by the receiving unit, and a plurality of TS packets in which the deforming unit modifies the TOT packet as an OFDM signal. And a broadcasting section for broadcasting. The predetermined area of the TOT packet among the plurality of TS packets received by the receiving unit includes information on the time difference between the TOT packet and the reference timing pulse, and the deforming unit displays the information on the time difference from the predetermined area of the TOT packet. In addition to the removal, error detection data is inserted into a predetermined area of the TOT packet instead of the time difference information, and the broadcasting unit broadcasts a plurality of TS packets as OFDM signals according to the time difference information.
　本発明のさらに別の態様は、伝送方法である。この方法は、所定の周期を有した基準タイミングパルスと、基準タイミングパルスの周期とは異なった周期を有したフレームパルスとを取得するステップと、取得したフレームパルス間に配置すべき複数のＴＳパケットを生成するステップと、生成した複数のＴＳパケットを他の放送装置に送信するステップと、生成した複数のＴＳパケットのうちのＴＯＴパケットを変形させるステップと、ＴＯＴパケットを変形した複数のＴＳパケットをＯＦＤＭ信号として放送するステップとを備える。生成するステップは、複数のＴＳパケットのうちのＴＯＴパケットの所定領域に、当該ＴＯＴパケットと基準タイミングパルスとの時間差の情報を含め、変形させるステップは、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、送信するステップが送信した複数のＴＳパケットを受信した他の放送装置に、ＴＯＴパケットの所定領域から時間差の情報を除去させるとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入させる。 Still another aspect of the present invention is a transmission method. This method includes a step of acquiring a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse, and a plurality of TS packets to be arranged between the acquired frame pulses. Generating a plurality of TS packets, a step of transmitting a plurality of generated TS packets to another broadcasting device, a step of modifying a TOT packet among the generated plurality of TS packets, and a plurality of TS packets obtained by modifying the TOT packet Broadcasting as an OFDM signal. The generating step includes information on the time difference between the TOT packet and the reference timing pulse in a predetermined region of the TOT packet among the plurality of TS packets, and the step of modifying removes the information on the time difference from the predetermined region of the TOT packet. In addition, the error detection data is inserted into the predetermined area of the TOT packet instead of the time difference information, and the transmission step receives the plurality of TS packets transmitted from the predetermined area of the TOT packet. The information is removed and error detection data is inserted into a predetermined area of the TOT packet instead of the time difference information.
　本発明のさらに別の態様もまた、伝送方法である。この方法は、所定の周期を有した基準タイミングパルスと、基準タイミングパルスの周期とは異なった周期を有したフレームパルスとが規定されており、フレームパルス間に配置された複数のＴＳパケットをＯＦＤＭ信号として他の放送装置から受信するステップと、受信した複数のＴＳパケットのうちのＴＯＴパケットを変形させるステップと、ＴＯＴパケットを変形した複数のＴＳパケットをＯＦＤＭ信号として放送するステップとを備える。受信するステップが受信した複数のＴＳパケットのうちのＴＯＴパケットの所定領域には、当該ＴＯＴパケットと基準タイミングパルスとの時間差の情報が含まれ、変形させるステップは、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、放送するステップは、時間差の情報に応じて、複数のＴＳパケットをＯＦＤＭ信号として放送する。 Still another aspect of the present invention is also a transmission method. In this method, a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse are defined, and a plurality of TS packets arranged between the frame pulses are transmitted by OFDM. Receiving as a signal from another broadcasting device, transforming a TOT packet among the received TS packets, and broadcasting a plurality of TS packets modified from the TOT packet as OFDM signals. The predetermined region of the TOT packet among the plurality of TS packets received by the receiving step includes information on the time difference between the TOT packet and the reference timing pulse, and the step of modifying the time difference from the predetermined region of the TOT packet In the step of removing information and inserting error detection data into a predetermined area of the TOT packet instead of the time difference information and broadcasting, a plurality of TS packets are broadcast as OFDM signals according to the time difference information.
　本発明のさらに別の態様は、放送システムである。この放送システムは、所定の周期を有した基準タイミングパルスと、基準タイミングパルスの周期とは異なった周期を有したフレームパルスとを取得し、取得したフレームパルス間に配置すべき複数のＴＳパケットを生成してから、生成した複数のＴＳパケットを従放送装置に送信するとともに、生成した複数のＴＳパケットのうちのＴＯＴパケットを変形させてＯＦＤＭ信号として放送する主放送装置と、主放送装置から受信した複数のＴＳパケットのうちのＴＯＴパケットを変形させてＯＦＤＭ信号として放送する従放送装置とを備える。主放送装置は、（１）送信のため、複数のＴＳパケットのうちのＴＯＴパケットの所定領域に、当該ＴＯＴパケットと基準タイミングパルスとの時間差の情報を含め、（２）放送のため、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、従放送装置は、（１）ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、（２）時間差の情報に応じて、複数のＴＳパケットをＯＦＤＭ信号として放送する。 Still another aspect of the present invention is a broadcasting system. This broadcasting system acquires a reference timing pulse having a predetermined cycle and a frame pulse having a cycle different from the cycle of the reference timing pulse, and a plurality of TS packets to be arranged between the acquired frame pulses. After the generation, the plurality of generated TS packets are transmitted to the slave broadcasting device, and the TOT packet of the generated plurality of TS packets is transformed and broadcast as an OFDM signal, and received from the main broadcasting device A slave broadcast device that transforms the TOT packet of the plurality of TS packets and broadcasts it as an OFDM signal. The main broadcast device includes (1) information on a time difference between the TOT packet and a reference timing pulse in a predetermined area of the TOT packet among a plurality of TS packets for transmission, and (2) a TOT packet for broadcast. The time difference information is removed from the predetermined area, and error detection data is inserted into the predetermined area of the TOT packet in place of the time difference information. The slave broadcasting device (1) obtains the time difference information from the predetermined area of the TOT packet. At the same time, error detection data is inserted into a predetermined area of the TOT packet instead of the time difference information, and (2) a plurality of TS packets are broadcast as OFDM signals according to the time difference information.
　なお、以上の構成要素の任意の組合せ、本発明の表現を方法、装置、システム、記録媒体、コンピュータプログラムなどの間で変換したものもまた、本発明の態様として有効である。 It should be noted that an arbitrary combination of the above-described components and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, and the like are also effective as an aspect of the present invention.
　本発明によれば、放送装置間のタイミング同期を効率よく実現できる。 According to the present invention, it is possible to efficiently realize timing synchronization between broadcasting apparatuses.
本発明の実施例に係るエリアワンセグメント放送システムの構成を示す図である。It is a figure which shows the structure of the area one segment broadcast system which concerns on the Example of this invention. 図２（ａ）－（ｄ）は、図１のエリアワンセグメント放送システムにおけるタイミングを示す図である。2A to 2D are diagrams showing timings in the area one segment broadcasting system of FIG. 図１の主放送装置の構成を示す図である。It is a figure which shows the structure of the main broadcast apparatus of FIG. 図４（ａ）－（ｂ）は、図３の主放送装置において生成されるＴＯＴパケットのフォーマットを示す図である。FIGS. 4A and 4B are diagrams showing the format of the TOT packet generated in the main broadcast apparatus of FIG. 図１の従放送装置の構成を示す図である。It is a figure which shows the structure of the slave broadcasting apparatus of FIG. 図１のエリアワンセグメント放送システムによる放送手順を示すシーケンス図である。It is a sequence diagram which shows the broadcast procedure by the area one segment broadcast system of FIG.
　本発明を具体的に説明する前に、まず概要を述べる。本発明の実施例は、エリアワンセグメント放送におけるコンテンツ配信サービスを実現するために、コンテンツデータが含まれたＯＦＤＭ信号を送信するエリアワンセグメント放送システムに関する。エリアワンセグメント放送システムには、複数の放送装置が含まれており、それらから放送された信号は受信装置にて受信される。受信装置における受信品質を向上させるために、複数の放送装置から同一内容の信号が放送されるとともに、放送装置間のタイミングが同期している必要がある。放送装置間のタイミング同期を効率よく実現するために、本実施例に係る放送装置は、次の処理を実行する。 Before describing the present invention specifically, an outline will be given first. An embodiment of the present invention relates to an area one segment broadcasting system for transmitting an OFDM signal including content data in order to realize a content distribution service in area one segment broadcasting. The area one segment broadcasting system includes a plurality of broadcasting devices, and signals broadcast from them are received by a receiving device. In order to improve the reception quality in the receiving device, it is necessary that signals having the same contents are broadcast from a plurality of broadcasting devices and the timings between the broadcasting devices are synchronized. In order to efficiently realize timing synchronization between broadcasting apparatuses, the broadcasting apparatus according to the present embodiment executes the following processing.
　本実施例において２種類の放送装置が存在する。ひとつは、放送対象となるコンテンツデータをＡＶエンコーダから受けつけ、コンテンツデータが含まれたＯＦＤＭ信号を放送するとともに、別の種類の放送装置へコンテンツデータを送信する放送装置（以下、「主放送装置という）である。もうひとつは、前述のごとく、主放送装置からコンテンツデータを受信し、コンテンツデータが含まれたＯＦＤＭ信号を放送する放送装置（以下、「従放送装置」という）である。ここでは、放送装置のタイミング同期を確立するために、従放送装置のタイミングは、主放送装置のタイミングに同期される。なお、主放送装置と従放送装置は、ＧＰＳでの受信信号をもとに、ＧＰＳのタイミングに同期した１ｐｐｓパルスを生成している。 There are two types of broadcasting devices in this embodiment. One is a broadcast device that receives content data to be broadcast from an AV encoder, broadcasts an OFDM signal including the content data, and transmits the content data to another type of broadcast device (hereinafter referred to as “main broadcast device”). The other is a broadcasting device (hereinafter referred to as a “subordinate broadcasting device”) that receives content data from the main broadcasting device and broadcasts an OFDM signal including the content data, as described above. Here, in order to establish timing synchronization of the broadcasting device, the timing of the slave broadcasting device is synchronized with the timing of the main broadcasting device. The main broadcast device and the sub broadcast device generate a 1 pps pulse synchronized with the GPS timing based on the received signal at the GPS.
　主放送装置は、コンテンツデータ等を格納するための複数のＭＰＥＧ２－ＴＳパケット（以下単にパケットと呼ぶこともある）を生成する。このうち、所定の間隔で配置されるのがＴＯＴ（Ｔｉｍｅ　Ｏｆｆｓｅｔ　Ｔａｂｌｅ）パケットである。具体的には、例えば５秒間隔でＴＯＴパケットが配置される。ＴＯＴパケットには、現在の日時を示す時刻情報が挿入される。したがって、５秒間隔で配置される場合には、挿入される時刻情報も５秒毎の値となる。また、ＴＯＴパケットには、挿入する時刻情報に対するエラーチェック用のデータであるＣＲＣ（Ｃｙｃｌｉｃ　Ｒｅｄｕｎｄａｎｃｙ　Ｃｈｅｃｋ）データも挿入される。本発明の実施例では、主放送装置は、まず、このＣＲＣデータを格納すべき所定領域にＣＲＣデータを格納せず、ＴＯＴパケットのタイミングと１ｐｐｓパルスとの時間差の情報を格納する。主放送装置は、そのようなＴＯＴパケットが含まれた複数のパケットを従放送装置へ送信する。この送信はＳＦＮ以外によってなされる。従放送装置は、複数のパケットを受信すると、ＴＯＴパケットを抽出し、所定領域に格納された時間差の情報をもとに、主放送装置とのタイミング同期を実行する。その後、主放送装置と従放送装置とは、複数のパケットをＯＦＤＭ信号に変換して放送する。その際、ＴＯＴパケットの所定領域から時間差の情報が除去され、正規のＣＲＣデータが格納される。また、この放送はＳＦＮによってなされる。 The main broadcasting device generates a plurality of MPEG2-TS packets (hereinafter sometimes simply referred to as packets) for storing content data and the like. Among these, TOT (Time Offset Table) packets are arranged at predetermined intervals. Specifically, TOT packets are arranged at intervals of 5 seconds, for example. Time information indicating the current date and time is inserted into the TOT packet. Therefore, in the case of being arranged at intervals of 5 seconds, the inserted time information is also a value every 5 seconds. In addition, CRC (Cyclic Redundancy Check) data, which is error check data for time information to be inserted, is also inserted into the TOT packet. In the embodiment of the present invention, the main broadcast apparatus first stores information on the time difference between the timing of the TOT packet and the 1 pps pulse without storing the CRC data in a predetermined area in which the CRC data is to be stored. The master broadcast device transmits a plurality of packets including such TOT packets to the slave broadcast device. This transmission is performed by other than SFN. When the slave broadcast device receives a plurality of packets, the slave broadcast device extracts the TOT packet and executes timing synchronization with the main broadcast device based on the time difference information stored in the predetermined area. Thereafter, the main broadcast apparatus and the sub broadcast apparatus convert a plurality of packets into OFDM signals and broadcast. At that time, the time difference information is removed from the predetermined area of the TOT packet, and the normal CRC data is stored. This broadcast is made by SFN.
　図１は、本発明の実施例に係るエリアワンセグメント放送システム１００の構成を示す。エリアワンセグメント放送システム１００は、主放送装置１０、第１ＧＰＳモジュール１２、ＨＵＢ１４、ＰＣ１６、第１無線装置１８、ＡＶエンコーダ２０、従放送装置３０、第２ＧＰＳモジュール３２、第２無線装置３４、受信装置４０を含む。また、主放送装置１０、従放送装置３０によってＳＦＮエリア５０が形成されている。ここでは説明を明瞭にするために、ひとつの従放送装置３０を示しているが、複数の従放送装置３０がエリアワンセグメント放送システム１００に含まれてもよい。 FIG. 1 shows a configuration of an area one segment broadcasting system 100 according to an embodiment of the present invention. The area one segment broadcasting system 100 includes a main broadcasting device 10, a first GPS module 12, a HUB 14, a PC 16, a first wireless device 18, an AV encoder 20, a slave broadcasting device 30, a second GPS module 32, a second wireless device 34, and a receiving device. 40 is included. Further, an SFN area 50 is formed by the main broadcast device 10 and the sub broadcast device 30. Here, for clarity of explanation, one slave broadcast device 30 is shown, but a plurality of slave broadcast devices 30 may be included in the area one segment broadcast system 100.
　第１ＧＰＳモジュール１２は、ＧＰＳ衛星からの信号を受信することによって、時刻情報を取得するとともに、１ｐｐｓパルスを取得する。これらの取得には公知の技術が使用されればよいので、ここでは説明を省略する。１ｐｐｓパルスは、１秒の周期を有した基準タイミングパルスである。第１ＧＰＳモジュール１２は、時刻情報と１ｐｐｓパルスとを主放送装置１０へ出力する。第１ＧＰＳモジュール１２は、位置情報を取得してもよいが、ここでは説明を省略する。 The first GPS module 12 receives a signal from a GPS satellite, thereby acquiring time information and a 1 pps pulse. Since a known technique may be used for these acquisitions, description thereof is omitted here. The 1 pps pulse is a reference timing pulse having a period of 1 second. The first GPS module 12 outputs time information and a 1 pps pulse to the main broadcast device 10. The first GPS module 12 may acquire position information, but the description thereof is omitted here.
　ＡＶエンコーダ２０は、動画音声データを符号化するとともに、符号化した動画音声データに、データ放送やＳＩ（Ｓｅｒｖｉｃｅ　Ｉｎｆｏｒｍａｔｉｏｎ）／ＰＳＩ（Ｐｒｏｇｒａｍ　Ｓｐｅｃｉｆｉｃ　Ｉｎｆｏｒｍａｔｉｏｎ）を多重してＴＳを生成し、このＴＳをＨＵＢ１４に出力する。ＰＣ１６は、ＨＵＢ１４を介して、ＡＶエンコーダ２０から出力すべきＴＳを制御する。ＨＵＢ１４は、主放送装置１０、ＰＣ１６、ＡＶエンコーダ２０、第１無線装置１８に接続され、ＴＳ、データ、制御信号等を中継する。ＨＵＢ１４を介した通信は、例えば、ＩＰ（Ｉｎｔｅｒｎｅｔ　Ｐｒｏｔｏｃｏｌ）によってなされる。 The AV encoder 20 encodes the moving image audio data, multiplexes data broadcasting and SI (Service Information) / PSI (Program Specific Information) with the encoded moving image audio data, and generates a TS. Output to. The PC 16 controls the TS to be output from the AV encoder 20 via the HUB 14. The HUB 14 is connected to the main broadcast device 10, the PC 16, the AV encoder 20, and the first radio device 18, and relays TS, data, control signals, and the like. Communication via the HUB 14 is performed by, for example, IP (Internet Protocol).
　主放送装置１０は、第１ＧＰＳモジュール１２から時刻情報と１ｐｐｓパルスとを取得する。また、主放送装置１０は、ＨＵＢ１４を介して、ＡＶエンコーダ２０からＴＳを取得する。主放送装置１０は、内部で生成されたフレームパルスを取得する。ここで、フレームパルスは、１ｐｐｓパルスの周期とは異なった周期を有する。フレームパルスの周期は、例えば、０．２３１３３６秒である。主放送装置１０は、フレームパルス間に配置すべき複数のパケットを生成する。ここで、複数のパケットの一部がＴＯＴパケットである。ＴＯＴパケットは、例えば５秒間隔に配置されている。そして、このＴＯＴパケットには、上述したとおり現在の時刻情報とともに、当該ＴＯＴパケットと当該１ｐｐｓパルスとの時間差の情報も含める。 The main broadcast device 10 acquires time information and 1 pps pulse from the first GPS module 12. Also, the main broadcast device 10 acquires a TS from the AV encoder 20 via the HUB 14. The main broadcast device 10 obtains internally generated frame pulses. Here, the frame pulse has a period different from the period of the 1 pps pulse. The period of the frame pulse is, for example, 0.231336 seconds. The main broadcast device 10 generates a plurality of packets to be arranged between frame pulses. Here, some of the plurality of packets are TOT packets. TOT packets are arranged at intervals of 5 seconds, for example. The TOT packet includes information on the time difference between the TOT packet and the 1 pps pulse as well as the current time information as described above.
　主放送装置１０は、ＨＵＢ１４を介して第１無線装置１８へ、複数のパケットを送信する。第１無線装置１８は、複数のパケットを第２無線装置３４へ出力する。第１無線装置１８と第２無線装置３４との間の通信は、例えば、無線ＬＡＮ（Ｌｏｃａｌ　Ａｒｅａ　Ｎｅｔｗｏｒｋ）、無線（Ｍｅｔｒｏｐｏｌｉｔａｎ　Ａｒｅａ　Ｎｅｔｗｏｒｋ）無線ＷＡＮ（Ｗｉｄｅ　Ａｒｅａ　Ｎｅｔｗｏｒｋ）にてなされる。なお、第１無線装置１８と第２無線装置３４は、図示しない基地局装置を介して通信してもよい。第２無線装置３４は、複数のパケットを従放送装置３０に出力するので、以上の処理は、生成した複数のパケットを従放送装置３０に送信することに相当する。 The main broadcast device 10 transmits a plurality of packets to the first wireless device 18 via the HUB 14. The first wireless device 18 outputs a plurality of packets to the second wireless device 34. Communication between the first wireless device 18 and the second wireless device 34 is performed by, for example, a wireless LAN (Local Area Network) or a wireless (Metropolitan Area Network) wireless WAN (Wide Area Network). The first radio apparatus 18 and the second radio apparatus 34 may communicate via a base station apparatus (not shown). Since the second radio apparatus 34 outputs a plurality of packets to the slave broadcast apparatus 30, the above processing corresponds to transmitting the generated plurality of packets to the slave broadcast apparatus 30.
　主放送装置１０は、従放送装置３０へ送信した複数のパケットのうちの一部のパケットを変形させる。具体的に説明すると、主放送装置１０は、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりにＣＲＣデータをＴＯＴパケットの所定領域に挿入する。主放送装置１０は、変形させた複数のパケットをＯＦＤＭ信号としてＳＦＮエリア５０へ放送する。なお、主放送装置１０は、従放送装置３０から放送される複数のパケットと送信タイミングを合わせるために、複数のパケットを遅延させてから放送する。 The master broadcast device 10 transforms some of the plurality of packets transmitted to the slave broadcast device 30. More specifically, the main broadcast apparatus 10 removes the time difference information from the predetermined area of the TOT packet and inserts CRC data into the predetermined area of the TOT packet instead of the time difference information. The main broadcast device 10 broadcasts the deformed packets to the SFN area 50 as OFDM signals. The main broadcast device 10 broadcasts after delaying the plurality of packets in order to match the transmission timing with the plurality of packets broadcast from the sub broadcast device 30.
　第２ＧＰＳモジュール３２は、第１ＧＰＳモジュール１２と同様の処理を実行するので、ここでは説明を省略する。従放送装置３０は、第２無線装置３４から時刻情報と１ｐｐｓパルスとを取得する。また、従放送装置３０は、第２無線装置３４から複数のパケットを取得する。従放送装置３０は、主放送装置１０から受信した複数のパケットのうちの一部のパケットを変形させる。具体的に説明すると、従放送装置３０は、ＴＯＴパケットから時間差の情報を除去するとともに、時間差の情報の代わりにＣＲＣデータをＴＯＴパケットに挿入する。従放送装置３０は、時間差の情報に応じて、変形させた複数のパケットをＳＦＮエリア５０へ放送する。なお、主放送装置１０、従放送装置３０のクロックは１ｐｐｓパルスを基準とし、フレームパルスは、１ｐｐｓパルスのうち後述するＴＯＴ検出デコード部によって選択される所定周期毎の１ｐｐｓパルスを基準とする。その結果、主放送装置１０から放送された複数のパケットと、従放送装置３０から放送された複数のパケットが、受信装置４０に受信される。 Since the second GPS module 32 executes the same process as the first GPS module 12, the description thereof is omitted here. The slave broadcast device 30 acquires time information and a 1 pps pulse from the second wireless device 34. In addition, the slave broadcast device 30 acquires a plurality of packets from the second wireless device 34. The sub broadcast device 30 transforms some of the plurality of packets received from the main broadcast device 10. More specifically, the slave broadcast device 30 removes time difference information from the TOT packet and inserts CRC data into the TOT packet instead of the time difference information. The slave broadcast device 30 broadcasts a plurality of modified packets to the SFN area 50 according to the time difference information. Note that the clocks of the main broadcast device 10 and the sub broadcast device 30 are based on 1 pps pulse, and the frame pulse is based on 1 pps pulse at a predetermined cycle selected by a TOT detection decoding unit described later among the 1 pps pulses. As a result, a plurality of packets broadcast from the main broadcast device 10 and a plurality of packets broadcast from the sub broadcast device 30 are received by the reception device 40.
　図２（ａ）－（ｄ）は、エリアワンセグメント放送システム１００におけるタイミングを示す。この変調モードは、ＭＯＤＥ３、ＱＰＳＫ（２／３）、ＧＩ＝１／８である。図２（ａ）は、１ｐｐｓパルスを示しており、１秒間隔でハイレベルになる。図２（ｂ）は、フレームパルスを示しており、０．２３１３３６秒間隔でハイレベルになる。図２（ｃ）は、フレームパルスの間に配置される複数のＴＳパケットを示す。図示のごとく、隣接したフレームパルスの間には、６４個のＴＳパケットが配置される。これらの関係から、１ｐｐｓパルスとフレームパルスの位相が重なる周期は２８９１７秒である。図２（ｄ）は、１ＭＨｚのクロックを示す。これは、１ｐｐｓパルスとフレームパルスの周期を整数であらわせる周期カウンタのクロックである。ＡＲＩＢ　ＳＴＤ－Ｂ３１の規格では１０ＭＨｚクロックの分解能で１ｐｐｓパルスの位相に対してフレームパルスの位相差をあらわしているが、本実施例では１ＭＨｚのクロックを使用することにより位相差を表現する。 FIGS. 2A to 2D show timings in the area one segment broadcasting system 100. FIG. This modulation mode is MODE3, QPSK (2/3), and GI = 1/8. FIG. 2A shows a 1 pps pulse, which goes high at 1 second intervals. FIG. 2B shows a frame pulse, which goes high at intervals of 0.231336 seconds. FIG. 2C shows a plurality of TS packets arranged between frame pulses. As shown in the figure, 64 TS packets are arranged between adjacent frame pulses. From these relationships, the period in which the phases of the 1 pps pulse and the frame pulse overlap is 28917 seconds. FIG. 2D shows a 1 MHz clock. This is a clock of a period counter that represents the period of 1 pps pulse and frame pulse as an integer. In the ARIB STD-B31 standard, the phase difference of the frame pulse is expressed with respect to the phase of the 1 pps pulse with the resolution of 10 MHz clock. In this embodiment, the phase difference is expressed by using the 1 MHz clock.
　図３は、主放送装置１０の構成を示す。主放送装置１０は、ＬＡＮインターフェイス部２００、ＣＰＵ２０２、ＴＯＴ検出部２０４、第１ＴＳ数カウント部２０６、第２取得部２０８、クロックカウント部２１０、第２生成部２１２、第１取得部２１４、リアルタイムクロック部２１６、クロック生成部２１８、ＴＯＴ検出デコード部２２０、第２ＴＳ数カウント部２２２、ＯＦＤＭフレームカウント部２２４、書き込みアドレス制御部２２６、読み出しアドレス制御部２２８、バッファメモリ２３０、変形部２３２、放送部２３４を含む。また、ＣＰＵ２０２は、送信部２４０、第１生成部２４２を含む。 FIG. 3 shows the configuration of the main broadcast device 10. The main broadcast device 10 includes a LAN interface unit 200, a CPU 202, a TOT detection unit 204, a first TS number counting unit 206, a second acquisition unit 208, a clock count unit 210, a second generation unit 212, a first acquisition unit 214, a real time clock. Unit 216, clock generation unit 218, TOT detection decoding unit 220, second TS number counting unit 222, OFDM frame counting unit 224, write address control unit 226, read address control unit 228, buffer memory 230, transformation unit 232, broadcast unit 234 including. The CPU 202 includes a transmission unit 240 and a first generation unit 242.
　第１取得部２１４は、第１ＧＰＳモジュール１２からの１ｐｐｓパルスを受けつけることによって、１ｐｐｓパルスを取得する。第２取得部２０８は、フレームパルスを取得する。例えば、第２取得部２０８は、１ｐｐｓパルスをもとにフレームパルスを生成する。フレームパルスの生成には公知の技術が使用されればよいので、ここでは説明を省略する。ＬＡＮインターフェイス部２００は、ＨＵＢ１４と接続されており、ＨＵＢ１４からＴＳをＩＰパケットとして受信する。ここで、ＴＳの伝送レートは、主放送装置１０の伝送レートに一致している。 The first acquisition unit 214 acquires a 1 pps pulse by receiving a 1 pps pulse from the first GPS module 12. The second acquisition unit 208 acquires a frame pulse. For example, the second acquisition unit 208 generates a frame pulse based on the 1 pps pulse. Since a known technique may be used for generating the frame pulse, the description thereof is omitted here. The LAN interface unit 200 is connected to the HUB 14 and receives a TS from the HUB 14 as an IP packet. Here, the transmission rate of the TS matches the transmission rate of the main broadcast device 10.
　リアルタイムクロック部２１６は、１ｐｐｓパルスをもとに、第１ＧＰＳモジュール１２から時刻情報に合わせた５秒間隔の割り込み信号を生成する。リアルタイムクロック部２１６は、割り込み信号をＣＰＵ２０２、ＴＯＴ検出デコード部２２０へ出力する。また、リアルタイムクロック部２１６は、１ｐｐｓパルスをＣＰＵ２０２、第２生成部２１２、クロックカウント部２１０へ出力する。 The real time clock unit 216 generates an interrupt signal at intervals of 5 seconds from the first GPS module 12 according to the time information based on the 1 pps pulse. The real time clock unit 216 outputs an interrupt signal to the CPU 202 and the TOT detection decoding unit 220. The real-time clock unit 216 outputs a 1 pps pulse to the CPU 202, the second generation unit 212, and the clock count unit 210.
　第１生成部２４２は、ＬＡＮインターフェイス部２００からＴＳを受けつけるとともに、リアルタイムクロック部２１６からの割り込み信号を受けつける。第１生成部２４２は、５秒間隔の割り込み信号により、複数のＴＳパケットの間に、ＴＯＴパケットを多重化する。ＴＯＴパケットはＡＶストリームよりも多重の優先順位が低いので約５秒間隔に設定される。また、ＴＯＴパケットの時刻は、受信装置４０が受信した時点での時刻という規格になっているのでＴＯＴパケットの多重時には先行した時刻が挿入される。したがって、ＴＯＴパケットと１ｐｐｓの位相は、通常ある程度離れている。このような多重化の結果、第１生成部２４２は、フレームパルス間に配置すべき複数のパケットを生成する。 The first generation unit 242 receives the TS from the LAN interface unit 200 and the interrupt signal from the real-time clock unit 216. The first generation unit 242 multiplexes TOT packets between a plurality of TS packets by an interrupt signal at intervals of 5 seconds. Since the priority of multiplexing is lower than that of the AV stream, the TOT packet is set at an interval of about 5 seconds. In addition, since the time of the TOT packet is based on the standard of the time when the receiving device 40 receives it, the preceding time is inserted when the TOT packet is multiplexed. Therefore, the TOT packet and the 1 pps phase are usually separated to some extent. As a result of such multiplexing, the first generation unit 242 generates a plurality of packets to be arranged between the frame pulses.
　ＴＯＴ検出部２０４は、第１生成部２４２からの複数のパケットからＴＯＴパケットを検出し、検出したタイミングを第１ＴＳ数カウント部２０６へ出力する。第１ＴＳ数カウント部２０６は、ＴＯＴ検出部２０４から、検出の通知を受けつけるとともに、第１生成部２４２から、複数のパケットを受けつける。第１ＴＳ数カウント部２０６は、これらをもとに、ＴＯＴパケットとフレームパルスとの間のパケット数を計測する。これは、ＴＯＴパケットとフレームパルスとの間の位相差のＴＳ数に相当する。 The TOT detection unit 204 detects a TOT packet from the plurality of packets from the first generation unit 242, and outputs the detected timing to the first TS number counting unit 206. The first TS number counting unit 206 receives a detection notification from the TOT detection unit 204 and receives a plurality of packets from the first generation unit 242. Based on these, the first TS number counting unit 206 measures the number of packets between the TOT packet and the frame pulse. This corresponds to the TS number of the phase difference between the TOT packet and the frame pulse.
　クロックカウント部２１０は、リアルタイムクロック部２１６から１ｐｐｓパルスを受けつけるとともに、第２取得部２０８からフレームパルスを受けつける。クロックカウント部２１０は、これらをもとに、フレームパルスと１ｐｐｓパルスとの間のクロック数を計測する。この計測には、１ＭＨｚのクロックが使用される。第２生成部２１２は、第１生成部２４２からの複数のパケット、第１ＴＳ数カウント部２０６からのパケット数、クロックカウント部２１０からのクロック数、第２取得部２０８からのフレームパルスを受けつける。第２生成部２１２は、複数のパケットのうちの一部のパケットであるＴＯＴパケットに、パケット数とクロック数との組合せを時間差の情報として含める。 The clock count unit 210 receives a 1 pps pulse from the real time clock unit 216 and a frame pulse from the second acquisition unit 208. Based on these, the clock count unit 210 measures the number of clocks between the frame pulse and the 1 pps pulse. A 1 MHz clock is used for this measurement. The second generation unit 212 receives a plurality of packets from the first generation unit 242, the number of packets from the first TS number count unit 206, the number of clocks from the clock count unit 210, and the frame pulse from the second acquisition unit 208. The second generation unit 212 includes a combination of the number of packets and the number of clocks as time difference information in a TOT packet that is a part of a plurality of packets.
　図４（ａ）－（ｂ）は、主放送装置１０において生成されるＴＯＴパケットのフォーマットを示す。図４（ａ）は、通常のＴＯＴパケットのフォーマットを示す。ＴＯＴパケットは例えば１８８バイトで構成されており、先頭の４バイトにはＴＳヘッダが配置される。ペイロードには時刻情報が挿入され、３２ビットのＣＲＣデータ領域には時刻情報に対するエラーチェック用のＣＲＣデータが挿入される。 4 (a)-(b) show the format of the TOT packet generated in the main broadcast apparatus 10. FIG. FIG. 4A shows the format of a normal TOT packet. The TOT packet is composed of, for example, 188 bytes, and a TS header is arranged in the first 4 bytes. Time information is inserted into the payload, and CRC data for error checking for the time information is inserted into the 32-bit CRC data area.
　図４（ｂ）は、第２生成部２１２において生成されるＴＯＴパケットのフォーマットを示す。このＴＯＴパケットは、通常のＴＯＴパケットにおいてＣＲＣデータが挿入されるべき３２ビットの領域（所定領域）に、ＴＯＴパケットのタイミングと１ｐｐｓパルスとの時間差の情報が挿入されている。具体的には、３２ビットの領域のうち１１ビットの領域にパケット数情報が挿入される。１１ビットとしたのは、約５秒間隔で送信されるＴＯＴパケットに対し指定されるＴＳパケットの最大値が、５秒間で伝送されるＴＳ数１３８４（１３８３の場合もあり）であるので、この１３８４の値を表現できるビット数が１１ビットだからであるからである。また、３２ビットの領域のうち１８ビットの領域にクロック数情報が挿入される。１８ビットとしたのは、指定されたＴＳに対してフレームパルスからの時間差をクロック数で指定する場合、フレーム間隔の最大クロック数が２３１３３６クロックであり、この２３１３３６を表現できるビット数が１８ビットだからであるからである。 FIG. 4B shows the format of the TOT packet generated by the second generation unit 212. In this TOT packet, information on the time difference between the timing of the TOT packet and the 1 pps pulse is inserted in a 32-bit area (predetermined area) in which CRC data is to be inserted in the normal TOT packet. Specifically, the packet number information is inserted into an 11-bit area in a 32-bit area. The 11 bits are set because the maximum value of TS packets specified for TOT packets transmitted at intervals of about 5 seconds is the number of TSs 1384 (in some cases 1383) transmitted in 5 seconds. This is because the number of bits that can represent the value of 1384 is 11 bits. In addition, clock number information is inserted into an 18-bit area of the 32-bit area. The reason for 18 bits is that when the time difference from the frame pulse is designated by the number of clocks for the designated TS, the maximum number of clocks in the frame interval is 231336 clocks, and the number of bits that can represent 231336 is 18 bits. Because.
　３２ビットの領域のうち２ビットの領域にはモード情報を挿入する、モード情報には、例えば、３２ビットの領域中にパケット数情報とクロック数情報とが含まれているか否かを示す情報等が含まれる。３２ビットの領域のうち残りの１ビットの領域には、当該フレームの初期値を挿入する。フレームの初期値とは、フレーム毎に反転するTMCCの差動復調の基準の１ビットの情報である。このような構成は、本実施例において１ＭＨｚのクロックを使用することによって可能になったものである。例えば、１０ＭＨｚのクロックを用いてクロック数を表現する場合、クロック数情報としては２２ビット必要になり、パケット数情報とクロック数情報との合計が３２ビットよりも大きくなってしまうので、そのようなクロック数情報は、ＣＲＣデータの代わりにＴＯＴパケットに含めることができない。 The mode information is inserted into the 2-bit area of the 32-bit area. The mode information includes, for example, information indicating whether or not the packet number information and the clock number information are included in the 32-bit area. Is included. The initial value of the frame is inserted into the remaining 1-bit area of the 32-bit area. The initial value of the frame is 1-bit information of TMCC differential demodulation that is inverted every frame. Such a configuration is made possible by using a 1 MHz clock in this embodiment. For example, when the number of clocks is expressed using a 10 MHz clock, 22 bits are required as the clock number information, and the sum of the packet number information and the clock number information becomes larger than 32 bits. Clock number information cannot be included in the TOT packet instead of CRC data.
　送信部２４０は、第２生成部２１２が生成した複数のパケットをＬＡＮインターフェイス部２００に出力する。その結果、複数のパケットは、ＨＵＢ１４、第１無線装置１８、第２無線装置３４を経由して、従放送装置３０へ送信される。バッファメモリ２３０は、送信部２４０から従放送装置３０への送信遅延に応じて、複数のパケットの放送タイミングを遅らせるために、第２生成部２１２からの複数のパケットを記憶する。この処理を具体的に説明すると、ＴＯＴ検出デコード部２２０がＴＯＴパケットを検出した後、ＴＯＴパケットに記載されている時刻情報に対応した、すなわちこの時刻情報を取得した直後の１ｐｐｓパルスを選択して出力し、書き込みアドレス制御部２２６は、バッファメモリ２３０のアドレスをセットしてその後のパケットを順番に記憶させる。 The transmission unit 240 outputs the plurality of packets generated by the second generation unit 212 to the LAN interface unit 200. As a result, the plurality of packets are transmitted to the slave broadcasting device 30 via the HUB 14, the first wireless device 18, and the second wireless device 34. The buffer memory 230 stores the plurality of packets from the second generation unit 212 in order to delay the broadcast timing of the plurality of packets according to the transmission delay from the transmission unit 240 to the slave broadcasting device 30. This process will be described in detail. After the TOT detection decoding unit 220 detects the TOT packet, it selects the 1 pps pulse corresponding to the time information described in the TOT packet, that is, immediately after obtaining this time information. The write address control unit 226 sets the address of the buffer memory 230 and stores subsequent packets in order.
　クロック生成部２１８は、１ｐｐｓパルスをもとに１ＭＨｚのクロックを生成する。ＯＦＤＭフレームカウント部２２４は、ＴＯＴ検出デコード部２２０において検出したＴＯＴパケットからフレームクロック数を読み出す。ＯＦＤＭフレームカウント部２２４は、選択された１ｐｐｓパルスの位相を基準にしてＴＯＴパケットに記載されたクロック数の位置にＯＦＤＭフレームパルスを生成する。第２ＴＳ数カウント部２２２は、選択された１ｐｐｓパルスとＯＦＤＭフレームパルスの位相を基準にしてパケット数を数えてフレーム周期の位相を合わせる。読み出しアドレス制御部２２８は、第２ＴＳ数カウント部２２２とＯＦＤＭフレームカウント部２２４でのカウント数に応じて、バッファメモリ２３０から複数のパケットを読み出す。 The clock generator 218 generates a 1 MHz clock based on the 1 pps pulse. The OFDM frame count unit 224 reads the number of frame clocks from the TOT packet detected by the TOT detection decoding unit 220. The OFDM frame count unit 224 generates an OFDM frame pulse at a position corresponding to the number of clocks described in the TOT packet with reference to the phase of the selected 1 pps pulse. Second TS number counting section 222 counts the number of packets based on the phase of the selected 1 pps pulse and the OFDM frame pulse, and matches the phase of the frame period. The read address control unit 228 reads a plurality of packets from the buffer memory 230 according to the count numbers in the second TS number counting unit 222 and the OFDM frame counting unit 224.
　変形部２３２は、バッファメモリ２３０からの複数のパケットのうちの一部のパケットを変形させる。変形対象となる一部のパケットは、ＴＯＴパケットである。具体的に説明すると、変形部２３２は、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりにＣＲＣデータをＴＯＴパケットの所定領域に挿入する。これは、図４（ｂ）を図４（ａ）に変形することに相当する。放送部２３４は、変形部２３２がＴＯＴパケットを変形した複数のパケットをＯＦＤＭ信号として放送する。 The deformation unit 232 deforms some of the plurality of packets from the buffer memory 230. Some of the packets to be modified are TOT packets. More specifically, the deforming unit 232 removes the time difference information from the predetermined area of the TOT packet and inserts CRC data into the predetermined area of the TOT packet instead of the time difference information. This corresponds to transforming FIG. 4B to FIG. 4A. The broadcast unit 234 broadcasts a plurality of packets obtained by modifying the TOT packet by the modification unit 232 as OFDM signals.
　なお、送信部２４０が送信した複数のパケットを受信した従放送装置３０も、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりにＣＲＣデータをＴＯＴパケットの所定領域に挿入する。従放送装置３０は、時間差の情報にしたがってって、ＴＯＴパケットが変形された複数のパケットをＯＦＤＭ信号として放送する。 The slave broadcast device 30 that has received the plurality of packets transmitted by the transmitter 240 also removes the time difference information from the predetermined area of the TOT packet and inserts CRC data into the predetermined area of the TOT packet instead of the time difference information. To do. The slave broadcast device 30 broadcasts a plurality of packets obtained by modifying the TOT packets as OFDM signals according to the time difference information.
　この構成は、ハードウエア的には、任意のコンピュータのＣＰＵ、メモリ、その他のＬＳＩで実現でき、ソフトウエア的にはメモリにロードされたプログラムなどによって実現されるが、ここではそれらの連携によって実現される機能ブロックを描いている。したがって、これらの機能ブロックがハードウエアのみ、ソフトウエアのみ、またはそれらの組合せによっていろいろな形で実現できることは、当業者には理解されるところである。 This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of any computer, and in terms of software, it can be realized by a program loaded in the memory, but here it is realized by their cooperation. Draw functional blocks. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.
　図５は、従放送装置３０の構成を示す。従放送装置３０は、ＬＡＮインターフェイス部３００、ＣＰＵ３０２、取得部３１４、リアルタイムクロック部３１６、クロック生成部３１８、ＴＯＴ検出デコード部３２０、ＴＳ数カウント部３２２、ＯＦＤＭフレームカウント部３２４、書き込みアドレス制御部３２６、読み出しアドレス制御部３２８、バッファメモリ３３０、変形部３３２、放送部３３４を含む。ＣＰＵ３０２は、受信部３４０を含む。 FIG. 5 shows the configuration of the slave broadcast device 30. The slave broadcast device 30 includes a LAN interface unit 300, a CPU 302, an acquisition unit 314, a real-time clock unit 316, a clock generation unit 318, a TOT detection decoding unit 320, a TS number counting unit 322, an OFDM frame counting unit 324, and a write address control unit 326. , A read address control unit 328, a buffer memory 330, a deformation unit 332, and a broadcast unit 334. The CPU 302 includes a receiving unit 340.
　受信部３４０は、ＬＡＮインターフェイス部３００を介して、第２無線装置３４からの複数のパケットを受けつける。これは、主放送装置１０からの複数のパケットを受信することに相当する。前述のごとく、複数のパケットにはＴＯＴパケットが含まれているが、そのフォーマットは、図４（ｂ）と同様である。バッファメモリ３３０は、受信部３４０において受信した複数のパケットを記憶する。取得部３１４、リアルタイムクロック部３１６、クロック生成部３１８、ＴＯＴ検出デコード部３２０、ＴＳ数カウント部３２２、ＯＦＤＭフレームカウント部３２４、書き込みアドレス制御部３２６、読み出しアドレス制御部３２８は、図３の第１取得部２１４、リアルタイムクロック部２１６、クロック生成部２１８、ＴＯＴ検出デコード部２２０、第２ＴＳ数カウント部２２２、ＯＦＤＭフレームカウント部２２４、書き込みアドレス制御部２２６、読み出しアドレス制御部２２８と同様であるので、ここでは説明を省略する。 The receiving unit 340 receives a plurality of packets from the second wireless device 34 via the LAN interface unit 300. This corresponds to receiving a plurality of packets from the main broadcast device 10. As described above, the plurality of packets include the TOT packet, but the format is the same as that in FIG. The buffer memory 330 stores a plurality of packets received by the receiving unit 340. The acquisition unit 314, the real-time clock unit 316, the clock generation unit 318, the TOT detection decoding unit 320, the TS number counting unit 322, the OFDM frame counting unit 324, the write address control unit 326, and the read address control unit 328 are illustrated in FIG. Since it is the same as the acquisition unit 214, the real-time clock unit 216, the clock generation unit 218, the TOT detection decoding unit 220, the second TS number counting unit 222, the OFDM frame counting unit 224, the write address control unit 226, and the read address control unit 228, The description is omitted here.
　変形部３３２は、変形部２３２と同様に、受信部３４０が受信した複数のパケットのうち、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりにＣＲＣデータをＴＯＴパケットの所定領域に挿入する。その結果、複数のパケットのうちの一部のパケットが変形される。放送部２３４は、変形部２３２がＴＯＴパケットを変形した複数のパケットをＯＦＤＭ信号として放送する。ここで、複数のパケットの放送は、ＴＯＴパケットに含まれた時間差の情報に応じてなされる。そのため、従放送装置３０の放送タイミングは、主放送装置１０の放送タイミングに同期される。 Similar to the deforming unit 232, the deforming unit 332 removes time difference information from a predetermined area of the TOT packet among a plurality of packets received by the receiving unit 340, and converts CRC data into the TOT packet information instead of the time difference information. Insert into a predetermined area. As a result, some of the plurality of packets are deformed. The broadcast unit 234 broadcasts a plurality of packets obtained by modifying the TOT packet by the modification unit 232 as OFDM signals. Here, the plurality of packets are broadcast according to the time difference information included in the TOT packet. Therefore, the broadcast timing of the slave broadcast device 30 is synchronized with the broadcast timing of the main broadcast device 10.
　以上の構成によるエリアワンセグメント放送システム１００の動作を説明する。図６は、エリアワンセグメント放送システム１００による放送手順を示すシーケンス図である。主放送装置１０は、ＴＯＴパケットの所定領域に時間差の情報を挿入する（Ｓ１０）。主放送装置１０は、複数のパケットをＯＦＤＭ信号として送信する（Ｓ１２）。複数のパケットは、主放送装置１０から従放送装置３０へ伝送される（Ｓ１４）。主放送装置１０、従放送装置３０は、ＴＯＴパケットの所定領域から時間差の情報を除外する（Ｓ１６、Ｓ１８）。主放送装置１０、従放送装置３０は、ＴＯＴパケットの所定領域にＣＲＣデータを挿入する（Ｓ２０、Ｓ２２）。主放送装置１０、従放送装置３０は、複数のパケットをＯＦＤＭ信号として放送する（Ｓ２４、Ｓ２６）。 The operation of the area one segment broadcasting system 100 configured as above will be described. FIG. 6 is a sequence diagram showing a broadcasting procedure by the area one segment broadcasting system 100. The main broadcast device 10 inserts time difference information into a predetermined area of the TOT packet (S10). The main broadcast device 10 transmits a plurality of packets as OFDM signals (S12). The plurality of packets are transmitted from the main broadcast device 10 to the sub broadcast device 30 (S14). The main broadcast device 10 and the sub broadcast device 30 exclude the time difference information from the predetermined area of the TOT packet (S16, S18). The main broadcast device 10 and the sub broadcast device 30 insert CRC data in a predetermined area of the TOT packet (S20, S22). The main broadcast device 10 and the sub broadcast device 30 broadcast a plurality of packets as OFDM signals (S24, S26).
　本発明の実施例によれば、ＴＯＴパケットにおけるＣＲＣデータの代わりに、時間差の情報を含めるので、同期に関する指示を効率よく伝送できる。また、同期に関する指示が効率よく伝送されるので、放送装置間のタイミング同期を効率よく実現できる。時間差の情報を従放送装置に送信するので、従放送装置にタイミングを同期させることができる。また、時間差の情報として、パケット数とクロック数とを送信するので、時間差の情報量を低減できる。また、時間差の情報をＴＯＴパケットから除去して、代わりにＣＲＣデータを挿入するので、放送の受信特性を向上できる。また、時間差の情報を主放送装置から受信するので、主放送装置とのタイミング同期を効率よく実行できる。 According to the embodiment of the present invention, since the information on the time difference is included instead of the CRC data in the TOT packet, an instruction regarding synchronization can be transmitted efficiently. In addition, since an instruction regarding synchronization is efficiently transmitted, timing synchronization between broadcasting apparatuses can be efficiently realized. Since the time difference information is transmitted to the slave broadcast device, the timing can be synchronized with the slave broadcast device. Further, since the number of packets and the number of clocks are transmitted as time difference information, the amount of time difference information can be reduced. Also, since the time difference information is removed from the TOT packet and CRC data is inserted instead, the broadcast reception characteristics can be improved. In addition, since time difference information is received from the main broadcast device, timing synchronization with the main broadcast device can be performed efficiently.
　また、タイミング同期が効率よく実現できるので、ローコストでネットワーク回線にも負担のないＳＦＮを構築できる。また、ＳＦＮを構築するエリア放送を行う場合、同期化の基準となる時刻により選択された１ｐｐｓパルスとフレームパルスの関係を効率的に表現できるクロックによる時間差の情報をＴＯＴパケットに入れ込むので、無効化階層ＴＳを伝送するＴＳ再多重フォーマットである必要がなくパケットの伝送効率を向上できる。また、エリアワンセグメント放送でＧＰＳを利用してＳＦＮを構築して放送を行う場合に、ネットワーク回線で分配されるＴＳを放送装置で送信する伝送ＴＳと一致したＴＳのＲＳ部がない１８８バイトの形式（放送ＴＳではない形式）で効率よく配信できる。また、ＳＦＮ同期のための情報はＴＯＴパケットのＣＲＣ部分を置き換えて伝送するので、無駄の少ないＴＳを配信できる。 Also, since timing synchronization can be realized efficiently, it is possible to construct an SFN that is low cost and does not burden the network line. In addition, when performing an area broadcast to construct an SFN, information on the time difference based on the clock that can efficiently express the relationship between the 1 pps pulse and the frame pulse selected by the time used as the reference for synchronization is included in the TOT packet, so it is invalid. Therefore, it is not necessary to use the TS remultiplexing format for transmitting the hierarchical layer TS, and the packet transmission efficiency can be improved. Also, when SFN is constructed and broadcast using GPS in area one segment broadcasting, there is no 188-byte RS part of the TS that matches the transmission TS that is transmitted by the broadcasting device for TS distributed over the network line It can be efficiently distributed in a format (a format that is not a broadcast TS). Further, since the information for SFN synchronization is transmitted by replacing the CRC part of the TOT packet, a TS with less waste can be distributed.
　以上、本発明を実施例をもとに説明した。この実施例は例示であり、それらの各構成要素や各処理プロセスの組合せにいろいろな変形例が可能なこと、またそうした変形例も本発明の範囲にあることは当業者に理解されるところである。 The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention. .
　本発明の実施例において、エリアワンセグメント放送システム１００は、ワンセグメント放送を実行している。しかしながらこれに限らず例えば、これらは、複数のセグメント放送を実行してもよい。複数のセグメント放送の一例は、フルセグメント放送、３セグメント放送である。本変形例によれば、さまざまな放送に本発明を適用できる。 In the embodiment of the present invention, the area one segment broadcast system 100 executes one segment broadcast. However, the present invention is not limited to this. For example, these may execute a plurality of segment broadcasts. An example of the plurality of segment broadcasts is a full segment broadcast and a three segment broadcast. According to this modification, the present invention can be applied to various broadcasts.
　１０　主放送装置、　３０　従放送装置、　１００　エリアワンセグメント放送システム、　２００　ＬＡＮインターフェイス部、　２０２　ＣＰＵ、　２０４　ＴＯＴ検出部、　２０６　第１ＴＳ数カウント部、　２０８　第２取得部、　２１０　クロックカウント部、　２１２　第２生成部、　２１４　第１取得部、　２１６　リアルタイムクロック部、　２１８　クロック生成部、　２２０　ＴＯＴ検出デコード部、　２２２　第２ＴＳ数カウント部、　２２４　ＯＦＤＭフレームカウント部、　２２６　書き込みアドレス制御部、　２２８　読み出しアドレス制御部、　２３０　バッファメモリ、　２３２　変形部、　２３４　放送部、　２４０　送信部、　２４２　第１生成部、　３００　ＬＡＮインターフェイス部、　３０２　ＣＰＵ、　３１４　取得部、　３１６　リアルタイムクロック部、　３１８　クロック生成部、　３２０　ＴＯＴ検出デコード部、　３２２　ＴＳ数カウント部、　３２４　ＯＦＤＭフレームカウント部、　３２６　書き込みアドレス制御部、　３２８　読み出しアドレス制御部、　３３０　バッファメモリ、　３３２　変形部、　３３４　放送部、　３４０　受信部。 10 main broadcast device, 30 slave broadcast device, 100 area one segment broadcast system, 200 LAN interface unit, 202 CPU, 204 TOT detection unit, 206 first TS number count unit, 208 second acquisition unit, 210 clock count unit, 212th count unit 2 generation unit, 214, first acquisition unit, 216 real-time clock unit, 218 clock generation unit, 220 TOT detection decode unit, 222 second TS number count unit, 224 OFDM frame count unit, 226 write address control unit, 228 read address control unit , 230 buffer memory, 232 transformation unit, 234 broadcast unit, 240 transmission unit, 242 first generation unit, 300 LAN interface unit, 302 CPU, 314 acquisition unit, 316 real-time clock unit, 318 clock generation unit, 320 TOT detection decoding unit, 322 TS number count unit, 324 OFDM frame count unit, 326 write address control unit, 328 read address control unit, 330 buffer memory, 332 Transformer, 334 Broadcaster, 340 Receiver.
　本発明によれば、放送装置間のタイミング同期を効率よく実現できる。 According to the present invention, it is possible to efficiently realize timing synchronization between broadcasting apparatuses.

Claims (7)

  1. 　所定の周期を有した基準タイミングパルスと、基準タイミングパルスの周期とは異なった周期を有したフレームパルスとを取得する取得部と、
    　前記取得部が取得したフレームパルス間に配置すべき複数のＴＳパケットを生成する生成部と、
    　前記生成部が生成した複数のＴＳパケットを他の放送装置に送信する送信部と、
    　前記生成部が生成した複数のＴＳパケットのうちのＴＯＴパケットを変形させる変形部と、
    　前記変形部が変形したＴＯＴパケットを含む複数のＴＳパケットをＯＦＤＭ信号として放送する放送部とを備え、
    　前記生成部は、ＴＯＴパケットの所定領域に、当該ＴＯＴパケットと基準タイミングパルスとの時間差の情報を含め、
    　前記変形部は、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、
    　前記送信部が送信した複数のＴＳパケットを受信した他の放送装置に、ＴＯＴパケットの所定領域から時間差の情報を除去させるとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入させることを特徴とする放送装置。     An acquisition unit for acquiring a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse;
    A generating unit that generates a plurality of TS packets to be arranged between frame pulses acquired by the acquiring unit;
    A transmission unit for transmitting a plurality of TS packets generated by the generation unit to another broadcasting device;
    A deforming unit for deforming a TOT packet among a plurality of TS packets generated by the generating unit;
    A broadcasting unit that broadcasts a plurality of TS packets including the modified TOT packet as an OFDM signal,
    The generation unit includes information on a time difference between the TOT packet and a reference timing pulse in a predetermined area of the TOT packet.
    The deforming unit removes time difference information from the predetermined area of the TOT packet and inserts error detection data into the predetermined area of the TOT packet instead of the time difference information.
    The other broadcasting device that has received the plurality of TS packets transmitted by the transmission unit removes the time difference information from the predetermined area of the TOT packet, and uses error detection data in the predetermined area of the TOT packet instead of the time difference information. A broadcasting apparatus characterized by being inserted.
  2. 　前記生成部は、ＴＯＴパケットとフレームパルスとの間のパケット数と、当該フレームパルスと基準タイミングパルスとの間のクロック数との組合せを時間差の情報としてＴＯＴパケットの所定領域に含めることを特徴とする請求項１に記載の放送装置。 The generation unit includes a combination of the number of packets between a TOT packet and a frame pulse and the number of clocks between the frame pulse and a reference timing pulse as a time difference information in a predetermined region of the TOT packet. The broadcasting apparatus according to claim 1.
  3. 　所定の周期を有した基準タイミングパルスと、基準タイミングパルスの周期とは異なった周期を有したフレームパルスとが規定されており、フレームパルス間に配置された複数のＴＳパケットをＯＦＤＭ信号として他の放送装置から受信する受信部と、
    　前記受信部が受信した複数のＴＳパケットのうちのＴＯＴパケットを変形させる変形部と、
    　前記変形部がＴＯＴパケットを変形した複数のＴＳパケットをＯＦＤＭ信号として放送する放送部とを備え、
    　前記受信部が受信した複数のＴＳパケットのうちのＴＯＴパケットの所定領域には、当該ＴＯＴパケットと基準タイミングパルスとの時間差の情報が含まれ、
    　前記変形部は、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、
    　前記放送部は、時間差の情報に応じて、複数のＴＳパケットをＯＦＤＭ信号として放送することを特徴とする放送装置。     A reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse are defined. A receiving unit for receiving from the broadcasting device;
    A deforming unit for deforming a TOT packet among a plurality of TS packets received by the receiving unit;
    A broadcasting unit that broadcasts a plurality of TS packets obtained by transforming the TOT packet as OFDM signals,
    The predetermined area of the TOT packet among the plurality of TS packets received by the reception unit includes information on the time difference between the TOT packet and the reference timing pulse,
    The deforming unit removes time difference information from the predetermined area of the TOT packet and inserts error detection data into the predetermined area of the TOT packet instead of the time difference information.
    The broadcast unit broadcasts a plurality of TS packets as OFDM signals according to time difference information.
  4. 　前記受信部が受信したＴＯＴパケットの所定領域に含まれた時間差の情報は、ＴＯＴパケットとフレームパルスとの間のパケット数と、当該フレームパルスと基準タイミングパルスとの間のクロック数との組合せによって示されることを特徴とする請求項３に記載の放送装置。 The information of the time difference included in the predetermined area of the TOT packet received by the receiving unit is based on the combination of the number of packets between the TOT packet and the frame pulse and the number of clocks between the frame pulse and the reference timing pulse. The broadcast apparatus according to claim 3, wherein the broadcast apparatus is displayed.
  5. 　所定の周期を有した基準タイミングパルスと、基準タイミングパルスの周期とは異なった周期を有したフレームパルスとを取得するステップと、
    　取得したフレームパルス間に配置すべき複数のＴＳパケットを生成するステップと、
    　生成した複数のＴＳパケットを他の放送装置に送信するステップと、
    　生成した複数のＴＳパケットのうちのＴＯＴパケットを変形させるステップと、
    　ＴＯＴパケットを変形した複数のＴＳパケットをＯＦＤＭ信号として放送するステップとを備え、
    　前記生成するステップは、複数のＴＳパケットのうちのＴＯＴパケットの所定領域に、当該ＴＯＴパケットと基準タイミングパルスとの時間差の情報を含め、
    　前記変形させるステップは、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、
    　前記送信するステップが送信した複数のＴＳパケットを受信した他の放送装置に、ＴＯＴパケットの所定領域から時間差の情報を除去させるとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入させることを特徴とする伝送方法。     Obtaining a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse;
    Generating a plurality of TS packets to be placed between acquired frame pulses;
    Transmitting the generated plurality of TS packets to another broadcasting device;
    Transforming a TOT packet among a plurality of generated TS packets;
    Broadcasting a plurality of TS packets obtained by modifying the TOT packet as an OFDM signal,
    The generating step includes information on a time difference between the TOT packet and the reference timing pulse in a predetermined region of the TOT packet among the plurality of TS packets.
    The transforming step removes time difference information from a predetermined area of the TOT packet and inserts error detection data in the predetermined area of the TOT packet instead of the time difference information.
    The other broadcasting apparatus that has received the plurality of TS packets transmitted by the transmitting step removes the time difference information from the predetermined area of the TOT packet, and uses error detection data instead of the time difference information in the predetermined area of the TOT packet. A transmission method characterized by being inserted into the network.
  6. 　所定の周期を有した基準タイミングパルスと、基準タイミングパルスの周期とは異なった周期を有したフレームパルスとが規定されており、フレームパルス間に配置された複数のＴＳパケットをＯＦＤＭ信号として他の放送装置から受信するステップと、
    　受信した複数のＴＳパケットのうちのＴＯＴパケットを変形させるステップと、
    　ＴＯＴパケットを変形した複数のＴＳパケットをＯＦＤＭ信号として放送するステップとを備え、
    　前記受信するステップが受信した複数のＴＳパケットのうちのＴＯＴパケットの所定領域には、当該ＴＯＴパケットと基準タイミングパルスとの時間差の情報が含まれ、
    　前記変形させるステップは、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、
    　前記放送するステップは、時間差の情報に応じて、複数のＴＳパケットをＯＦＤＭ信号として放送することを特徴とする伝送方法。     A reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse are defined, and a plurality of TS packets arranged between the frame pulses are used as other OFDM signals as OFDM signals. Receiving from a broadcast device;
    Transforming a TOT packet of a plurality of received TS packets;
    Broadcasting a plurality of TS packets obtained by modifying the TOT packet as an OFDM signal,
    The predetermined area of the TOT packet among the plurality of TS packets received by the receiving step includes information on a time difference between the TOT packet and the reference timing pulse,
    The transforming step removes time difference information from a predetermined area of the TOT packet and inserts error detection data in the predetermined area of the TOT packet instead of the time difference information.
    The transmitting step includes broadcasting a plurality of TS packets as OFDM signals according to time difference information.
  7. 　所定の周期を有した基準タイミングパルスと、基準タイミングパルスの周期とは異なった周期を有したフレームパルスとを取得し、取得したフレームパルス間に配置すべき複数のＴＳパケットを生成してから、生成した複数のＴＳパケットを従放送装置に送信するとともに、生成した複数のＴＳパケットのうちのＴＯＴパケットを変形させてＯＦＤＭ信号として放送する主放送装置と、
    　主放送装置から受信した複数のＴＳパケットのうちのＴＯＴパケットを変形させてＯＦＤＭ信号として放送する従放送装置とを備え、
    　前記主放送装置は、（１）送信のため、複数のＴＳパケットのうちのＴＯＴパケットの所定領域に、当該ＴＯＴパケットと基準タイミングパルスとの時間差の情報を含め、（２）放送のため、ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、
    　前記従放送装置は、（１）ＴＯＴパケットの所定領域から時間差の情報を除去するとともに、時間差の情報の代わりに誤り検出用データをＴＯＴパケットの所定領域に挿入し、（２）時間差の情報に応じて、複数のＴＳパケットをＯＦＤＭ信号として放送することを特徴とする放送システム。     After acquiring a reference timing pulse having a predetermined period and a frame pulse having a period different from the period of the reference timing pulse, and generating a plurality of TS packets to be arranged between the acquired frame pulses, A master broadcasting device that transmits the generated plurality of TS packets to the slave broadcasting device, and transforms the TOT packet of the generated plurality of TS packets to broadcast as an OFDM signal;
    A sub broadcast apparatus that transforms a TOT packet of a plurality of TS packets received from the main broadcast apparatus and broadcasts it as an OFDM signal,
    The main broadcast device includes (1) information on a time difference between the TOT packet and a reference timing pulse in a predetermined area of the TOT packet among a plurality of TS packets for transmission, and (2) TOT for broadcast. While removing the time difference information from the predetermined area of the packet, inserting error detection data into the predetermined area of the TOT packet instead of the time difference information,
    The slave broadcasting device (1) removes the time difference information from the predetermined area of the TOT packet, inserts error detection data into the predetermined area of the TOT packet instead of the time difference information, and (2) converts the information into the time difference information. Accordingly, a broadcasting system that broadcasts a plurality of TS packets as OFDM signals.
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