WO2014155927A1 - Appareil de diffusion, procédé de transmission et système de diffusion - Google Patents

Appareil de diffusion, procédé de transmission et système de diffusion 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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Prior art keywords
packets
tot
time difference
packet
unit
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PCT/JP2014/000606
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English (en)
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/fr

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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

La présente invention concerne une première unité de génération (242) et une seconde unité de génération (212) qui génèrent chacune une pluralité de paquets devant être disposés entre des impulsions de trame acquises. La seconde unité de génération (212) inclut, dans chacun des paquets TOT faisant partie de la pluralité de paquets, des informations de différence temporelle entre le paquet TOT et une impulsion de synchronisation de référence. Une unité de transmission (240) transmet la pluralité de paquets générée vers un autre appareil de transmission. Une unité de transformation (232) transforme certains des paquets de la pluralité de paquets générée. L'unité de transformation (232) supprime les informations de différence temporelle de chacun des paquets TOT faisant partie de la pluralité de paquets et insère, dans le paquet TOT, des données de détection d'erreur en lieu et place des informations de différence temporelle. Une unité de diffusion (234) transmet la pluralité de paquets dont certains paquets ont été transformés.
PCT/JP2014/000606 2013-03-29 2014-02-05 Appareil de diffusion, procédé de transmission et système de diffusion WO2014155927A1 (fr)

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JP2013071220A JP2014195210A (ja) 2013-03-29 2013-03-29 放送装置、伝送方法、放送システム

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KR101795199B1 (ko) * 2013-03-29 2017-11-07 미쓰비시덴키 가부시키가이샤 신호 처리 장치
CN104507154B (zh) * 2014-11-20 2018-04-10 上海华为技术有限公司 数据传输方法、通信设备及通信系统

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JP2003032207A (ja) * 2001-07-12 2003-01-31 Nec Corp 地上波ディジタル放送のｓｆｎシステム及びその伝送遅延制御方法
JP2004194265A (ja) * 2002-10-17 2004-07-08 Nippon Television Network Corp 地上デジタル放送受信処理装置、地上デジタル放送中継伝送装置、放送情報記録装置及び地上デジタル放送中継伝送方法
JP2007060361A (ja) * 2005-08-25 2007-03-08 Toshiba Corp 放送時間表示システム、およびその表示制御方法

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Publication number Priority date Publication date Assignee Title
JP2003032207A (ja) * 2001-07-12 2003-01-31 Nec Corp 地上波ディジタル放送のｓｆｎシステム及びその伝送遅延制御方法
JP2004194265A (ja) * 2002-10-17 2004-07-08 Nippon Television Network Corp 地上デジタル放送受信処理装置、地上デジタル放送中継伝送装置、放送情報記録装置及び地上デジタル放送中継伝送方法
JP2007060361A (ja) * 2005-08-25 2007-03-08 Toshiba Corp 放送時間表示システム、およびその表示制御方法

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