JP4242613B2 - Reception system, digital broadcasting system, and reception method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a receiving system., DeDigital broadcasting system,andHow to receiveTo the lawRelated.
[0002]
[Prior art]
With the development of digital image / audio technology using MPEG2, digital multi-channel broadcasting using communication satellites has already been put into practical use. Therefore, the configuration of a conventional digital broadcasting system will be described with reference to FIG. However, FIG. 9 is a configuration diagram of a digital broadcasting system 151 according to a conventional technique.
[0003]
The digital broadcasting system 151 includes a transmission system 102 that generates and transmits a transport stream, and a reception system 153 that receives the transport stream and outputs it to the display 4 or the recording device 5. The satellite repeater (transponder) 6 is a device that relays radio waves and is mounted on the communication satellite 7.
[0004]
Next, the configuration of the transmission system 102 in the conventional technique will be described.
[0005]
The transmission system 102 includes a program selection related data generation unit 109, a packet multiplexing unit 10, and the like.
[0006]
The encoding unit 8 includes an MPEG2 video encoder that performs digital video compression encoding and an MPEG2 audio encoder that performs digital audio compression encoding. That is, the encoding unit 8 is a part that generates a packet stream composed of packets having program content and outputs the packet stream to the packet multiplexing unit 10.
[0007]
The program selection related data generation unit 109 generates a packet stream including a packet having program specification information (PSI, Program Specific Information) and a packet having service information (SI, Service Information), and the packet multiplexing unit 10 This is the output part. However, the program specification information is composed of a network information table (NIT), a program association table (PAT), a program map table (PMT), and the service information is an SDT (service description table), SDT (service description table). ) Etc. As described above, the program selection related data generation unit 109 is a part that generates a packet stream including packets having contents of program selection related data and outputs the packet stream to the packet multiplexing unit 10.
[0008]
The packet multiplexing unit 10 includes a packet stream including packets having program content output from the encoding unit 8 and a packet including program selection related data content output from the program selection related data generation unit 109. This is a part for time-division multiplexing a packet stream consisting of the above into one transport stream.
[0009]
The transmission path encoding unit 11 is a part that performs error correction code addition, interleaving processing, and synchronization signal addition (framing) on the transport stream output from the packet multiplexing unit 10. However, the interleaving process is performed in order to improve the error correction capability by changing the order of data transmission in byte units. Further, the synchronization signal is added in order to facilitate synchronization in the reception system 153 by giving the synchronization byte periodicity.
[0010]
The modulation unit 12 is a part that modulates the signal output from the transmission path encoding unit 11 by quadrature phase shift keying (QPSK). However, the radio wave 147 is a transmission radio wave.
[0011]
Next, the configuration of the reception system 153 in the conventional technique will be described.
[0012]
The reception system 153 is a system having a packet demultiplexing unit 166, a stream transmission processing unit 172, and the like.
[0013]
The receiving unit 13 is a part that receives the radio wave 148 transmitted from the satellite repeater 6.
[0014]
The demodulator 14 is a part having a detection circuit that demodulates the radio wave 148.
[0015]
The transmission path decoding unit 15 restores the transport stream whose transmission order is changed in units of bytes to the original transport stream by the interleaving process in the transmission path encoding unit 10, and restores the restored transport stream. This is the part that performs error correction on the stream.
[0016]
The packet demultiplexing unit 166 is a part having a PID filter 169 and the like.
[0017]
The PID designation unit 178 is a part that can designate the PID of the packet having the content of the recorded program in the recording PID storage 18. The PID specifying unit 178 is a part that can specify the NIT PID (that is, the PID of the NIT packet) in the NIT PID storage 23. However, as will be described later, the recorded program is a program selected by an instruction from the outside.
[0018]
The recording PID storage 18 is a device that receives a signal from the PID designation unit 178 and stores the PID of a packet having the content of the recorded program.
[0019]
From the transport stream output from the transmission path decoding unit 15, the PID filter 169 includes a packet having the content of the recorded program indicated by the recording PID storage 18, a packet having program specification information, and a packet having service information. Is a device for extracting each. However, the PID filter 169 has a function of allowing a packet having program specification information and a packet having service information to pass through as they are.
[0020]
The output switching circuit 20 is a circuit for switching output for display / recording of the transport stream output from the PID filter 169.
[0021]
The SIT (Selection Information Table) generation processing unit 21 is a part that generates and processes SIT packets from the service information output from the PID filter 169.
[0022]
The stream transmission processing unit 172 is a part having a SIT packet replacement unit 176 and the like.
[0023]
The NIT PID storage 23 is a device that receives a signal from the PID designation unit 178 and stores the NITPID. As will be described later, the NIT packet is used as a replace packet that can be replaced with the SIT packet.
[0024]
The SIT storage 25 is a device that stores an SIT packet that is generated and processed by the SIT generation processing unit 21.
[0025]
The SIT packet replacer 176 is a device that can replace the NIT packet pointed out by the NIT PID storage 25 with the SIT packet output from the SIT storage 25.
[0026]
The packet modification unit 29 is a part that can input the signal output from the SIT packet replacer 176 and modify the packet to create a transport stream for recording. The generated transport stream is output to the recording device 5.
[0027]
The decoding unit 27 decompresses the compression-encoded audio signal input from the output switching circuit 20 and the MPEG2 video decoder that decompresses the compression-coded video signal input from the output switching circuit 20. This is the part that has an MPEG2 audio decoder to perform. That is, the decoding unit 27 is a part that decompresses the transport stream for display having the content of the compression-encoded program and outputs it to the display 4. The transport stream for display is composed of transport packets including video and audio contents.
[0028]
The display 4 is a device having a CRT that reproduces the video signal output from the decoding unit 27 and a speaker that reproduces the audio signal output from the decoding unit 27.
[0029]
The recording device 5 is a device that records the transport stream for recording output from the SIT packet replacement unit 176.
[0030]
The operation of the conventional digital broadcasting system 151 having such a configuration will be described with reference to FIG. However, FIG. 10 is a conceptual diagram illustrating a process in which a recording transport stream 196 is generated from a broadcast transport stream 144.
[0031]
Here, the operation of the transmission system 102 in the prior art will be described in detail.
[0032]
The encoding unit 8 generates a packet stream composed of packets 130 and 138 having the contents of program A and a packet stream composed of packets 131, 135 and 139 having the contents of program B, and packet-multiplexes them. To the unit 10.
[0033]
The program selection related data generation unit 109 generates a packet stream including the PAT packet 132, the PMT packet 137, the NIT packet 134, the SDT packet 136, and the EIT packet 133, and outputs these to the packet multiplexing unit 10.
[0034]
The packet multiplexing unit 10 generates a transport stream 144 by multiplexing the packet stream output from the encoding unit 8 and the packet stream output from the program selection related data generation unit 109. This is output to the transmission path encoding unit 11.
[0035]
The transmission path encoding unit 11 performs error correction code addition, interleaving processing, and synchronization signal addition on the transport stream output from the packet multiplexing unit 10, and outputs this to the modulation unit 12.
[0036]
The modulation unit 12 modulates the transport stream output from the transmission path encoding unit 11 by four-phase phase shift keying, and transmits the radio wave 147 from the antenna.
[0037]
The satellite repeater 6 receives the radio wave 147 and transmits the radio wave 148.
[0038]
Next, the operation of the reception system 153 in the conventional technique will be described in detail.
[0039]
The receiving system 153 starts the receiving operation by selecting the program A as a recorded program according to an instruction from the outside. That is, the receiving system 153 receives the radio wave 148 from the satellite repeater 6 and detects the PMT by referring to the information in the PAT in the transport stream. The PMT has a PID of a packet in which a stream related to the program A is transmitted. The PID designation unit 178 recognizes the PID of the packets 130 and 138 having the recorded program content, and outputs a signal to the recorded PID storage 18. Further, the PID designation unit 178 recognizes the PID of the NIT packet 134 and outputs a signal to the NIT PID storage 23.
[0040]
The recording PID storage 18 receives a signal from the PID designation unit 178 and stores the PIDs of the packets 130 and 138 having the contents of the program A. The NIT PID storage 23 receives a signal from the PID designation unit 178 and stores the PID of the NIT packet 134.
[0041]
The reception unit 13 receives the radio wave 148 and outputs it to the demodulation unit 14.
[0042]
The demodulator 14 outputs a transport stream obtained by demodulating the radio wave 148 received by the receiver 13 to the transmission path decoder 15.
[0043]
The transmission path decoding unit 15 performs error correction on the transport stream output from the demodulation unit 14, restores the transport stream 144, and outputs this to the PID filter 169.
[0044]
As described above, the recording PID storage 18 stores the PIDs of the packets 130 and 138 having the contents of the program A. Therefore, the recording PID storage 18 can point the packets 130 and 138 having the contents of the program A to the PID filter 169.
[0045]
The PID filter 169 extracts the packets 130 and 138 having the contents of the program A pointed out by the recording PID storage 18 from the transport stream 144 output from the transmission path decoding unit 15. The PID filter 169 extracts the PAT packet 132, the PMT packet 137, the NIT packet 134, the SDT packet 136, and the EIT packet 133 from the transport stream 144 output from the transmission path decoding unit 15.
[0046]
In this way, the PID filter 169 outputs SDT and EIT to the SIT generation processing unit 21. The PID filter 169 switches the output of the transport stream 195 including the packets 130 and 138 having the contents of the program A, the PAT packet 132, the PMT packet 137, the NIT packet 134, the SDT packet 136, and the EIT packet 133. Output to the circuit 20.
[0047]
The SIT generation processing unit 21 generates SIT packets 141 and 142 from necessary service information by chewing SDT and EIT output from the PID filter 169, and outputs them to the SIT storage 25. The SIT storage 25 outputs the SIT packets 141 and 142 output from the SIT generation processing unit 21 to the SIT packet replacement unit 176.
[0048]
The output switching circuit 20 receives the transport stream 195 output from the PID filter 169.
[0049]
When the output switching in the output switching circuit 20 is for display, the output switching circuit 20 outputs the display transport stream to the decoding unit 27. Note that the transport stream for display is composed of packets 130 and 138 having the contents of program A filtered with reference to information in the PMT.
[0050]
The decoding unit 27 decompresses the transport stream for display output from the output switching circuit 20 and outputs it to the display 4 as a signal.
[0051]
The display 4 receives the signal output from the decoding unit 27 and reproduces the video and audio constituting the program A.
[0052]
When the output switching in the output switching circuit 20 is for recording, the output switching circuit 20 outputs the transport stream 195 to the SIT packet replacer 176.
[0053]
As already described, the NIT PID storage 23 stores the PID of the NIT packet 134. Accordingly, the NIT PID store 23 can point the NIT packet 134 to the SIT packet replacer 176.
[0054]
The SIT packet replacer 176 receives the transport stream 195 output from the output switching circuit 20. The SIT packet replacer 176 replaces the NIT packet 134 pointed out by the NIT PID storage 23 with the SIT packet 141 output from the SIT storage 25.
[0055]
In this way, the SIT packet replacer 126 replaces the NIT packet 134 with the SIT packet 141 and outputs a signal to the packet modification unit 29.
[0056]
The packet modification unit 29 receives the signal output from the SIT packet replacer 176 and selects only the specification information that correctly represents the transport stream 195, thereby modifying the PAT packet 132 into the modified PAT packet 140, and the PMT The packet 137 is modified to the modified PMT packet 143. Further, the packet modifying unit 29 discards the SDT packet 136 and the EIT packet 133.
[0057]
The packet modifying unit 29 thus generates a recording transport stream 196 and outputs it to the recording device 5.
[0058]
The recording device 5 inputs the transport stream 196 output from the packet modification unit 29 and records it.
[0059]
[Problems to be solved by the invention]
By the way, the transmission frequency of the NIT packet may be only about once every 10 seconds depending on the broadcasting media. This transmission frequency is insufficient as the transmission frequency of the replace packet that can be replaced with the SIT packet.
[0060]
In the above, there is no NIT packet in the transport stream 195 that can be replaced by the SIT packet 142. For this reason, it is impossible to transfer the SIT packet 142 to the recording transport stream 196. Therefore, the SIT packet 142 is discarded.
[0061]
  In consideration of such a problem, the present invention provides a receiving system that can reliably secure a replacement packet that can be replaced with a SIT packet., DeDigital broadcasting system,andHow to receiveThe lawIt is intended to provide.
[0062]
[Means for Solving the Problems]
  First main departureTomorrow,(1)Compression-encoded program content;(2)Program specification information having at least NIT, PAT, and PMTWhen,(3)Service information with at least SDT and EITNews andAnd receiving a transport stream transmitted from a transmission system for generating and transmitting a transport stream,
  in frontNPackets other than IT packetsPIDReplacement targetPID andA PID designation part that can be designated as
  Specified by the PID specification unitA replace PID store for storing the PID;
  in frontRecordA SIT generation processing unit that generates a SIT packet from service information;
  The replace packet designated by the replace PID storage and the NIT packet are replaced with the SIT packet.RuA reception system including a packet extraction / replacement unit.
[0063]
  Second main departureTomorrowThe transmission system includes:Substitution other than (1) to (3) aboveA dummy packet is generated, and the dummy packet is inserted into the transport stream.Send,
  The PID designating unit reads the PI of the dummy packetDSaidTo be replacedThe receiving system according to the first aspect of the present invention is characterized by being designated as a PID.
[0064]
  Third main departureTomorrowThe transmission system generates frequency information of the SIT packet, and the frequency information of the SIT packetSendBelieve
  The PID designation unit refers to the frequency information of the SIT packet, andTo be replacedIt is characterized by specifying PIDFirst or second present inventionIt is a receiving system.
[0065]
  Fourth main departureTomorrow,Further comprising output switching means for switching output for display / recording of the transport stream received by the receiving unit;
  SaidThe replacement target specified by the PID specification partPID is all or part of the PID of a packet having non-recorded program contentAnd,
  The packet extraction and replacement unit, NonPackets with recorded program contentReplace with the SIT packetThis is a receiving system according to the third aspect of the present invention.
[0066]
  The fifth main departureTomorrow, The PID designating section contains the content of the non-recorded program.TsuOr EIT,Or SDTPacketsSpecify
  The packet extraction and replacement unit,in frontSpecified by the PID designating unit with reference to the frequency information of the SIT packetPThe SIT packet is selected from among packets having an ID.AtNo. characterized by placingFourIt is the receiving system of this invention.
[0067]
  Sixth departureTomorrow,(1)Compression-encoded program content;(2)Program specification information having at least NIT, PAT, and PMTAnd (3) smallService information with at least SDT and EITAnd manyA transmission system for generating and transporting a transport stream by multiplexing,
  A receiver for receiving a transport stream transmitted from the transmission system;NPID of packets other than IT packetsCan be specified as replacement target PIDA PID designation section;PID specified by the PID specification unitReplace PID store for storingRecordA SIT generation processing unit for generating a SIT packet from service information, a replacement packet instructed by the replacement PID storage, and a packet extraction and replacement unit for replacing the NIT packet with the SIT packetHaveReceiving systemAndIt is a digital broadcasting system characterized by comprising.
[0068]
  The seventh main departureTomorrow,(1) The content of the compressed and encoded program, (2) the program specification information having at least NIT, PAT, and PMT, and (3) the service information having at least SDT and EIT are multiplexed, and the transport stream Receiving a transport stream transmitted from a transmission system for generating and transmitting
A PID designation step capable of designating a PID of a packet other than the NIT packet as a PID to be replaced;
A replacement PID storing step for storing the PID specified by the PID specifying unit;
A SIT generation processing step of generating a SIT packet from the service information;
  A reception method comprising: a replacement packet instructed in the replacement PID storage step; and a packet extraction and replacement step of replacing the NIT packet with the SIT packet.
[0069]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the invention will be described with reference to the drawings.
(Embodiment 1)
First, the configuration of the digital broadcast system according to the first embodiment will be described with reference to FIG. However, FIG. 1 is a configuration diagram of the digital broadcast system 1 according to the first embodiment.
[0070]
The digital broadcasting system 1 includes a transmission system 2 that generates and transmits a transport stream, and a reception system 3 that receives the transport stream and outputs it to the display 4 or the recording device 5. The satellite repeater (transponder) 6 is a device that relays radio waves and is mounted on the communication satellite 7.
[0071]
Next, the configuration of the transmission system 2 in Embodiment 1 will be described in detail with reference to FIG. However, FIG. 2 is a configuration diagram of the transmission system 2 according to the first embodiment.
[0072]
The transmission system 2 is a system having a program selection related data generation unit 9, a packet multiplexing unit 10, and the like.
[0073]
The encoding unit 8 includes an MPEG2 video encoder that performs digital video compression encoding and an MPEG2 audio encoder that performs digital audio compression encoding. That is, the encoding unit 8 is a part that generates a packet stream composed of packets having program content and outputs the packet stream to the packet multiplexing unit 10.
[0074]
The program selection related data generation unit 9 is a part that generates a packet stream including a packet having program specification information, a packet having service information, and a dummy packet for each program, and outputs the packet stream to the packet multiplexing unit 10. . A packet having data for notifying the receiving system 3 of the PID of each program dummy packet in advance is also generated by the program selection related data generation unit 9 and output to the packet multiplexing unit 10. Note that the PID of each program dummy packet is also specified by the PMT in the same manner as the PID of the data constituting the program. As described above, the program selection related data generation unit 9 is a part that generates a packet stream including packets having contents of program selection related data and outputs the packet stream to the packet multiplexing unit 10.
[0075]
The packet multiplexing unit 10 includes a packet stream including packets having program content output from the encoding unit 8 and a packet including program selection related data content output from the program selection related data generating unit 9. This is a part for time-division multiplexing a packet stream consisting of the above into one transport stream.
[0076]
The transmission path encoding unit 11 is a part that adds an error correction code to the transport stream output from the packet multiplexing unit 10, and further performs interleaving processing and synchronization signal addition.
[0077]
The modulator 12 is a part that modulates the transport stream output from the transmission path encoder 11 and transmits the radio wave 47 from the antenna.
[0078]
Next, the configuration of the receiving system 3 in the first embodiment will be described in detail with reference to FIG. However, FIG. 3 is a configuration diagram of the reception system 3 in the first embodiment.
[0079]
The reception system 3 is a system having a packet demultiplexing unit 16, a stream transmission processing unit 22, and the like.
[0080]
The receiving unit 13 is a part that receives the radio wave 48 transmitted from the satellite repeater 6 (shown in FIG. 1).
[0081]
The demodulator 14 is a part having a detection circuit that demodulates the radio wave 48.
[0082]
The transmission path decoding unit 15 is a part that restores the transport stream interleaved in the transmission path encoding unit 11 to the original transport stream, and performs error correction on the restored transport stream. .
[0083]
The packet demultiplexing unit 16 is a part having a PID filter 19 and the like.
[0084]
The PID designation unit 28 can designate the PID of the recorded program dummy packet (hereinafter also referred to as a recorded program dummy PID) to the first replace PID storage 17 and the second replace PID store 24. Part. However, as will be described later, the recorded program is a program selected by an instruction from the outside.
[0085]
The first replace PID storage unit 17 is a device that receives a signal from the PID designation unit 28 and stores a recorded program dummy PID. The recorded program dummy PID stored in the first replace PID storage 17 is the same as the recorded program dummy PID stored in the second replace PID storage 24.
[0086]
The recording PID storage 18 is a device that receives a signal from the PID designation unit 28 and stores the PID of a packet having the content of the recorded program.
[0087]
The PID filter 19 uses the transport stream output from the transmission path decoding unit 15 to record the packet having the content of the recorded program indicated by the recording PID storage 18 and the recording indicated by the first replace PID storage 17. This is a device that extracts a program dummy packet, a packet having program specification information, and a packet having service information. However, the PID filter 169 has a function of allowing a packet having program specification information and a packet having service information to pass through as they are.
[0088]
The output switching circuit 20 is a circuit that performs display / recording output switching of the transport stream output from the PID filter 19.
[0089]
The SIT generation processing unit 21 is a part that generates and processes SIT packets from the SDT and EIT output from the PID filter 19.
[0090]
The stream transmission processing unit 22 is a part having a SIT packet replacement unit 26 and the like.
[0091]
The NIT PID storage 23 is a device that receives a signal from the PID designation unit 28 and stores the NIT PID.
[0092]
The second replace PID storage 24 is a device that receives a signal from the PID designation unit 28 and stores a recorded program dummy PID. The recorded program dummy PID stored in the second replace PID storage 24 is the same as the recorded program dummy PID stored in the first replace PID storage 17.
[0093]
The SIT storage 25 is a device that stores an SIT packet that is generated and processed by the SIT generation processing unit 21.
[0094]
The SIT packet replacement unit 26 outputs the NIT packet pointed out by the NIT PID store 23 and the recorded program dummy packet pointed out by the second replace PID store 24 to the SIT packet output from the SIT store 25. It is a device that can be replaced with.
[0095]
The packet modifying unit 29 is a part that can input a signal output from the SIT packet replacing unit 26 and modify the packet to create a transport stream for recording. The generated transport stream is output to the recording device 5.
[0096]
The decoding unit 27 decompresses the compression-encoded audio signal input from the output switching circuit 20 and the MPEG2 video decoder that decompresses the compression-coded video signal input from the output switching circuit 20. This is the part that has an MPEG2 audio decoder to perform. That is, the decoding unit 27 is a part that decompresses the transport stream for display having the content of the compression-encoded program and outputs it to the display 4.
[0097]
The operation of the digital broadcast system 1 according to the first embodiment having such a configuration will be described with reference to FIG. However, FIG. 4 is a concept for explaining a process in which a recording transport stream 46 is generated from a broadcast transport stream 44 through a transport stream 45 processed in the packet demultiplexing unit 16. FIG.
[0098]
Here, the operation of the transmission system 2 according to the first embodiment will be described in detail with reference to FIG. 2 and FIG.
[0099]
The encoding unit 8 generates a packet stream including the packets 30 and 38 having the content of the program A and a packet stream including the packet 31 having the content of the program B, and outputs these to the packet multiplexing unit 10 To do.
[0100]
The program selection related data generation unit 9 generates a packet stream including a PAT packet 32, a PMT packet 37, an NIT packet 34, an SDT packet 36, an EIT packet 33, a program A dummy packet 39, and a program B dummy packet 35. These are generated and output to the packet multiplexing unit 10.
[0101]
The packet multiplexing unit 10 generates a transport stream 44 by multiplexing the packet stream output from the encoding unit 8 and the packet stream output from the program selection related data generation unit 9. This is output to the transmission path encoding unit 11.
[0102]
The transmission path encoding unit 11 performs error correction code addition, interleave processing, and synchronization signal addition on the transport stream 44 output from the packet multiplexing unit 10, and outputs this to the modulation unit 12.
[0103]
The modulation unit 12 modulates the transport stream output from the transmission path encoding unit 11 by four-phase phase shift keying, and transmits a radio wave 47 from the antenna.
[0104]
Satellite repeater 6 (shown in FIG. 1) receives radio wave 47 (shown in FIG. 1) and transmits radio wave 48 (shown in FIG. 1).
[0105]
Next, the operation of the receiving system 3 according to the first embodiment will be described in detail with reference to FIGS.
[0106]
The receiving system 3 starts the receiving operation by selecting the program A as a recorded program in the first embodiment according to an instruction from the outside. That is, the receiving system 3 receives the radio wave 48 from the satellite repeater 6 and detects the PMT with reference to the information in the PAT in the transport stream. The PID designation unit 28 recognizes the PID of the recorded program dummy packet 39 and outputs a signal to the first replacement PID storage 17 and the second replacement PID storage 24. The PID designation unit 28 also outputs signals to the recording PID store 18 and the NIT PID store 23.
[0107]
The recording PID storage 18 receives a signal from the PID designation unit 28 and stores the PIDs of the packets 30 and 38 having the contents of the program A. The first replace PID storage 17 receives a signal from the PID designation unit 28 and stores the PID of the program A dummy packet 39. The NIT PID storage 23 receives a signal from the PID designation unit 28 and stores the PID of the NIT packet 34. The second replace PID storage 24 receives a signal from the PID specifying unit 28 and stores the PID of the program A dummy packet 39.
[0108]
The receiver 13 receives the radio wave 48 and outputs it to the demodulator 14.
[0109]
The demodulator 14 outputs a transport stream obtained by demodulating the radio wave 48 received by the receiver 13 to the transmission path decoder 15.
[0110]
The transmission path decoding unit 15 performs error correction on the transport stream output from the demodulation unit 14, restores the transport stream 44, and outputs this to the PID filter 19.
[0111]
As described above, the recording PID storage 18 stores the PIDs of the packets 30 and 38 having the contents of the program A. The first replace PID storage 17 stores the PID of the program A dummy packet 39 as a replace PID.
[0112]
Therefore, the recording PID storage 18 can point out the packets 30 and 38 having the contents of the program A to the PID filter 19. The first replace PID storage 17 can point out the program A dummy packet 39 to the PID filter 19.
[0113]
The PID filter 19 uses the packets 30 and 38 having the contents of the program A pointed out by the recording PID storage 18 from the transport stream 44 output from the transmission path decoding unit 15, and the first replacement PID storage 17. The program A dummy packet 39 to be pointed out is extracted. The PID filter 19 extracts the PAT packet 32, the PMT packet 37, the NIT packet 34, the SDT packet 36, and the EIT packet 33 from the transport stream 44 output from the transmission path decoding unit 15.
[0114]
In this way, the PID filter 19 outputs SDT and EIT to the SIT generation processing unit 21. The PID filter 19 includes a packet 30 and 38 having program A contents, a program A dummy packet 39, a PAT packet 32, a PMT packet 37, an NIT packet 34, an SDT packet 36, and an EIT packet 33. The port stream 45 is output to the output switching circuit 20.
[0115]
The SIT generation processing unit 21 receives the SDT and EIT output from the PID filter 19, generates SIT packets 41 and 43, and outputs them to the SIT storage 25. The SIT storage 25 outputs the SIT packets 41 and 43 output from the SIT generation processing unit 21 to the SIT packet replacement unit 26.
[0116]
The output switching circuit 20 receives the transport stream 45 output from the PID filter 19.
[0117]
When the output switching in the output switching circuit 20 is for display, the output switching circuit 20 outputs the display transport stream to the decoding unit 27.
[0118]
The decoding unit 27 decompresses the transport stream for display output from the output switching circuit 20 and outputs it to the display 4 as a signal.
[0119]
The display 4 receives the signal output from the decoding unit 27 and displays the video and audio constituting the program A.
[0120]
When the output switching in the output switching circuit 20 is for recording, the output switching circuit 20 outputs the transport stream 45 to the SIT packet replacement unit 26.
[0121]
As already described, the NIT PID storage 23 stores the PID of the NIT packet 34. The second replace PID storage 24 stores the PID of the dummy packet 39 for program A.
[0122]
Therefore, the NIT PID store 23 can point the NIT packet 34 to the SIT packet replacer 26. Further, the second replace PID storage 24 can point the program A dummy packet 39 to the SIT packet replacement unit 26.
[0123]
The SIT packet replacer 26 receives the transport stream 45 output from the output switching circuit 20. The SIT packet replacement unit 26 replaces the NIT packet 34 pointed out by the NIT PID storage 23 with the SIT packet 41 output from the SIT storage 25. Also, the SIT packet replacement unit 26 replaces the program A dummy packet 39 pointed out by the second replacement PID storage 24 with the SIT packet 43 output from the SIT storage 25.
[0124]
In this way, the SIT packet replacement unit 26 replaces the NIT packet 34 with the SIT packet 41 and replaces the dummy packet 39 for the program A with the SIT packet 42, and outputs a signal to the packet modification unit 29.
[0125]
The packet modification unit 29 receives the signal output from the SIT packet replacer 26, selects only the specification information that correctly represents the transport stream 45, thereby modifying the PAT packet 32 to the modified PAT packet 40, and the PMT The packet 37 is modified to a modified PMT packet 42. Further, the packet modifying unit 29 discards the SDT packet 36 and the EIT packet 33. In this way, the packet modification unit 29 generates the transport stream 46 for recording and outputs it to the recording device 5.
[0126]
The recording device 5 receives the transport stream 46 output from the packet modification unit 29 and records it.
[0127]
Note that the PID of each program dummy packet in the present invention does not need to be specified in the PMT as in the first embodiment, and is described as a descriptor in the descriptor area of the SDT or EIT. May be.
[0128]
Thus, the problem that the NIT packet transmission frequency as a replacement packet is insufficient is solved by transmitting each program dummy packet that can be replaced with the SIT packet from the transmission system.
[0129]
(Embodiment 2)
First, the configuration of the digital broadcast system according to the second embodiment will be described with reference to FIG. However, FIG. 5 is a configuration diagram of the digital broadcasting system 51 in the second embodiment.
[0130]
The digital broadcasting system 51 includes a transmission system 52 that generates and transmits a transport stream, and a reception system 53 that receives the transport stream and outputs it to the display 4 or the recording device 5.
[0131]
Next, the configuration of the transmission system 52 in the second embodiment will be described.
[0132]
The transmission system 52 includes a program selection related data generation unit 59, a packet multiplexing unit 10, and the like.
[0133]
The program selection related data generation unit 59 is a part that generates a packet stream including a packet having program specification information and a packet having service information, and outputs the packet stream to the packet multiplexing unit 10. A packet having SIT recording frequency data for instructing an appropriate recording frequency of SIT is also generated by the program selection related data generation unit 59 and output to the packet multiplexing unit 10. Note that SIT recording frequency data for instructing an appropriate SIT recording frequency is described as a descriptor in the SDT or EIT descriptor area.
[0134]
Next, the configuration of reception system 53 in the second embodiment will be described.
[0135]
The reception system 53 is a system having a packet demultiplexing unit 66, a stream transmission processing unit 72, and the like.
[0136]
The packet demultiplexing unit 66 is a part having a PID filter 69 and the like.
[0137]
The PID designation unit 78 refers to the SIT recording frequency data output from the program selection related data generation unit 59 for the PID of the packet having the content of the non-recorded program (hereinafter also referred to as the non-recorded PID). This is a device that can be designated as the PID storage 67 and the second replacement PID storage 74.
[0138]
The first replace PID storage 67 is a device that receives a signal from the PID designation unit 78 and stores a non-recorded PID. Note that the non-recording PID stored in the first replacement PID storage 67 is the same as the non-recording PID stored in the second replacement PID storage 74.
[0139]
The PID filter 69 uses the transport stream output from the transmission path decoding unit 15, a packet having the content of the recorded program pointed out by the recording PID storage unit 18, and the non-pointed out point indicated by the first replace PID storage unit 67. It is a device that extracts a packet having contents of a recorded program, a packet having program specification information, and a packet having service information.
[0140]
The stream transmission processing unit 72 is a part having a SIT packet replacement unit 76 and the like.
[0141]
The second replacement PID storage 74 is a device that receives a signal from the PID designation unit 78 and stores a non-recorded PID. The non-recording PID stored in the second replacement PID storage 74 is the same as the non-recording PID stored in the first replacement PID storage 67.
[0142]
The SIT packet replacer 76 outputs the NIT packet pointed out by the NIT PID store 23 and the packet having the content of the non-recorded program pointed out by the second replace PID store 74 from the SIT store 25. It is a device that can be replaced with a SIT packet.
[0143]
The operation of the digital broadcasting system 51 according to the second embodiment having such a configuration will be described with reference to FIG. However, FIG. 6 is a concept for explaining a process in which a recording transport stream 96 is generated from a broadcast transport stream 94 via a transport stream 95 processed by the packet demultiplexing unit 66. FIG.
[0144]
Here, the operation of the transmission system 52 in the second embodiment will be described in detail.
[0145]
The encoding unit 8 generates a packet stream consisting of packets 80 and 88 having the contents of program A and a packet stream consisting of packets 81, 85 and 89 having the contents of program B, and packet-multiplexes them. To the unit 10.
[0146]
The program selection related data generation unit 59 generates a packet stream including the PAT packet 82, the PMT packet 87, the NIT packet 84, the SDT packet 86, and the EIT packet 83, and outputs these to the packet multiplexing unit 10.
[0147]
The packet multiplexing unit 10 generates a transport stream 94 by multiplexing the packet stream output from the encoding unit 8 and the packet stream output from the program selection related data generation unit 59. This is output to the transmission path encoding unit 11.
[0148]
The transmission path encoding unit 11 performs error correction code addition, interleaving processing, and synchronization signal addition on the transport stream output from the packet multiplexing unit 10, and outputs this to the modulation unit 12.
[0149]
The modulation unit 12 modulates the transport stream output from the transmission path encoding unit 11 and transmits a radio wave 97.
[0150]
The satellite repeater 6 receives the radio wave 97 and transmits the radio wave 98.
[0151]
Next, the operation of the reception system 53 in the second embodiment will be described in detail.
[0152]
The receiving system 53 starts the receiving operation by selecting the program A as a recorded program in the second embodiment in accordance with an instruction from the outside. That is, the receiving system 53 receives the radio wave 98 from the satellite repeater 6, and detects the PMT by referring to the information in the PAT in the transport stream. The PID designation unit 78 refers to the SIT recording frequency data output from the program selection related data generation unit 59 and appropriately recognizes the PID of the packet 85 having the content of the program B that is a non-recorded program, and the first ID Signals are output to the replacement PID storage 17 and the second replacement PID storage 24. The PID designating unit 78 also outputs signals to the recording PID storage 18 and the NIT PID storage 23.
[0153]
The recording PID storage 18 receives a signal from the PID designation unit 78 and stores the PIDs of the packets 80 and 88 having the contents of the program A. The first replace PID storage 67 receives a signal from the PID designating unit 78 and appropriately stores the PID of the packet 85 having the content of the program B that is a non-recorded program. The NITPID storage 23 receives a signal from the PID designation unit 78 and stores the PID of the NIT packet 84. The second replace PID storage 74 receives a signal from the PID designating unit 78 and appropriately stores the PID of the packet 85 having the content of the program B.
[0154]
The PID designation unit 78 does not designate the PIDs of the packets 81 and 89 having the contents of the program B as the replacement PIDs by referring to the SIT recording frequency data. Therefore, the PIDs of the packets 81 and 89 having the content of the program B are not stored in the first replace PID storage 67. Further, the PIDs of the packets 81 and 89 having the contents of the program B are not stored in the second replace PID storage 74.
[0155]
The receiver 13 receives the radio wave 98 and outputs it to the demodulator 14.
[0156]
The demodulator 14 outputs a transport stream obtained by demodulating the radio wave 98 received by the receiver 13 to the transmission path decoder 15.
[0157]
The transmission path decoding unit 15 performs error correction on the transport stream output from the demodulation unit 14, restores the transport stream 94, and outputs this to the PID filter 69.
[0158]
As described above, the recording PID storage 18 stores the PIDs of the packets 80 and 88 having the contents of the program A. Further, the first replace PID storage 67 appropriately stores the PID of the packet 85 having the content of the program B which is a non-recorded program as the replace PID (the packets 81 and 89 having the content of the program B). PID is not specified as a replacement PID).
[0159]
Therefore, the recording PID storage 18 can point out the packets 80 and 88 having the contents of the program A to the PID filter 69. The first replace PID storage 67 can point out the packet 85 having the content of the program B to the PID filter 69.
[0160]
The PID filter 69 uses the packets 80 and 88 having the contents of the program A pointed out by the recording PID storage 18 from the transport stream 94 output from the transmission path decoding unit 65, and the first replacement PID storage 67. The packet 85 having the content of the indicated program B is extracted. Further, the PID filter 69 extracts the PAT packet 82, the PMT packet 87, the NIT packet 84, the SDT packet 86, and the EIT packet 83 from the transport stream 94 output from the transmission path decoding unit 15.
[0161]
In this way, the PID filter 69 outputs SDT and EIT to the SIT generation processing unit 71. The PID filter 69 includes packets 80 and 88 having program A contents, a packet 85 having program B contents, a PAT packet 82, a PMT packet 87, a NIT packet 84, an SDT packet 86, and an EIT packet 83. The transport stream 95 is output to the output switching circuit 20.
[0162]
The SIT generation processing unit 21 receives the SDT and EIT output from the PID filter 69, generates SIT packets 91 and 92, and outputs them to the SIT storage 75. The SIT storage 25 outputs the SIT packets 91 and 92 output from the SIT generation processing unit 21 to the SIT packet replacement unit 76.
[0163]
The output switching circuit 20 receives the transport stream 95 output from the PID filter 69.
[0164]
When the output switching in the output switching circuit 20 is for display, the output switching circuit 20 outputs the display transport stream to the decoding unit 27. The decoding unit 27 decompresses the display transport stream output from the output switching circuit 20 and outputs the decompressed signal to the playback device 4.
[0165]
The playback device 4 receives the signal output from the decoding unit 27 and plays back the video and audio that make up the program A.
[0166]
When the output switching in the output switching circuit 20 is for recording, the output switching circuit 70 outputs the transport stream 95 to the SIT packet replacer 76.
[0167]
As already described, the NIT PID storage 23 stores the PID of the NIT packet 84. The second replace PID storage 74 appropriately stores the PID of the packet 85 having the content of the program B.
[0168]
The SIT packet replacement unit 76 receives the transport stream 95 output from the output switching circuit 20. The SIT packet replacer 76 replaces the NIT packet 84 pointed out by the NIT PID storage 23 with the SIT packet 91 output from the SIT storage 25. Further, the SIT packet replacement unit 76 replaces the packet 85 having the content of the program B pointed out by the second replacement PID storage unit 74 with the SIT packet 92 output from the SIT storage unit 25.
[0169]
In this way, the SIT packet replacer 76 replaces the NIT packet 84 with the SIT packet 91 and replaces the packet 85 with the content of the program B by the SIT packet 92, and outputs a signal to the packet modifying unit 29.
[0170]
The packet modification unit 29 receives the signal output from the SIT packet replacer 76, modifies the PAT packet 82 into the modified PAT packet 90, and modifies the PMT packet 87 into the modified PMT packet 93. Further, the packet modifying unit 29 discards the SDT packet 86 and the EIT packet 83. The packet modifying unit 29 thus generates a recording transport stream 96 and outputs it to the recording apparatus 5.
[0171]
The recording device 5 inputs the transport stream 96 output from the packet modification unit 29 and records it.
[0172]
The replacement PID in the present invention does not have to be all or a part of the non-recording PID as in the second embodiment described above, and may be an SDT PID or an EIT PID.
[0173]
In this way, by sending SIT recording frequency data instructing an appropriate recording frequency of SIT and using a packet having the contents of a non-recorded program as a replace packet that can be replaced with the SIT packet, The problem of insufficient transmission frequency of NIT packets as packets has been solved.
[0174]
(Embodiment 3)
First, the configuration of the digital broadcast system according to the third embodiment will be described with reference to FIG. However, FIG. 7 is a configuration diagram of the digital broadcast system 101 according to the third embodiment.
[0175]
The digital broadcast system 101 includes a transmission system 102 that generates and transmits a transport stream, and a reception system 103 that receives the transport stream and outputs it to the display 4 or the recording device 5.
[0176]
The transmission system 102 in the third embodiment is the same as the transmission system in the prior art.
[0177]
Therefore, the configuration of reception system 103 in Embodiment 3 will be described with reference to FIG.
[0178]
The receiving system 103 is a system having a packet demultiplexing unit 116, a stream transmission processing unit 122, and the like.
[0179]
The packet demultiplexing unit 116 is a part having a PID filter 119 and the like.
[0180]
The PID designation unit 128 sends the PID of the packet having the content of the non-recorded program (hereinafter also referred to as non-recorded PID) and the EIT PID (that is, the PID of the EIT packet) to the first replace PID storage 117 and the second This is a part that can be specified in the replace PID storage 124.
[0181]
The first replace PID storage 117 is a device that receives a signal from the PID designation unit 128 and stores a non-recorded PID and an EIT PID. The non-recording PID and EIT PID stored in the first replacement PID storage 117 are the same as the non-recording PID and EIT PID stored in the second replacement PID storage 124.
[0182]
The PID filter 119 uses the transport stream output from the transmission path decoding unit 15 to generate a packet having the content of the recorded program pointed out by the recording PID storage unit 18 and the non-pointed out point indicated by the first replace PID storage unit 117. This is a device that extracts a packet having the contents of a recorded program, an EIT packet pointed out by the first replace PID storage 117, a packet having program specification information, and a packet having service information.
[0183]
The stream transmission processing unit 122 is a part having a SIT packet replacement unit 126 and the like.
[0184]
The second replacement PID storage 124 is a device that receives a signal from the PID designation unit 128 and stores a non-recorded PID and an EIT PID. The non-recording PID and EIT PID stored in the second replacement PID storage 124 are the same as the non-recording PID and EIT PID stored in the first replacement PID storage 117.
[0185]
The SIT packet replacer 126 receives the NIT packet pointed out by the NIT PID store 23, the packet having the content of the non-recorded program pointed out by the second replace PID store 124, and the second replace PID store 124. This is a device that can replace the indicated EIT packet with the SIT packet output from the SIT storage 25.
[0186]
The packet modification unit 129 is a part that can input a signal output from the SIT packet replacer 126 and modify the packet to create a recording transport stream.
[0187]
The operation of the digital broadcast system 101 according to the third embodiment having such a configuration will be described with reference to FIG. However, FIG. 8 illustrates a concept for explaining a process in which a transport stream 146 for recording is generated from a broadcast transport stream 144 via a transport stream 145 processed in the packet demultiplexing unit 116. FIG.
[0188]
The operation of the transmission system 102 in the third embodiment is the same as the operation of the transmission system in the conventional technique.
[0189]
Therefore, the operation of reception system 103 in the third embodiment will be described in detail.
[0190]
The receiving system 103 starts the receiving operation by selecting the program A as a recorded program in the third embodiment according to an instruction from the outside. That is, the receiving system 103 receives the radio wave 148 from the satellite repeater 6, and refers to the information in the PAT in the transport stream to detect the PMT. The PID designation unit 128 recognizes the PIDs of the packets 131, 135, and 139 having the contents of the program B that is a non-recorded program and the EIT packet 133, and the first replace PID storage 117 and the second replace PID storage The signal is output to 124. The PID designation unit 128 also outputs signals to the recording PID storage 18 and the NIT PID storage 23.
[0191]
The recording PID storage 18 receives a signal from the PID designation unit 128 and stores the PIDs of the packets 130 and 138 having the contents of the program A. The first replace PID storage 117 receives a signal from the PID designation unit 128 and stores the PIDs of the packets 131, 135, and 139 having the contents of the program B and the PID of the EIT packet 133. The NIT PID storage 23 receives a signal from the PID designation unit 128 and stores the PID of the NIT packet 134. The second replace PID storage 124 receives a signal from the PID designation unit 28 and stores the PIDs of the packets 131, 135, and 139 having the contents of the program B and the PID of the EIT packet 133.
[0192]
The reception unit 13 receives the radio wave 148 and outputs it to the demodulation unit 14.
[0193]
The demodulator 14 outputs a transport stream obtained by demodulating the radio wave 148 received by the receiver 13 to the transmission path decoder 15.
[0194]
The transmission path decoding unit 15 performs error correction on the transport stream output from the demodulation unit 14, restores the transport stream 144, and outputs this to the PID filter 119.
[0195]
The PID filter 119 uses the packets 130 and 138 having the contents of the program A pointed out by the recording PID storage 18 from the transport stream 144 output from the transmission path decoding unit 15, and the first replacement PID storage 117. The PID of the packets 131, 135, and 139 having the contents of the indicated program B and the EIT packet 133 indicated by the first replace PID storage 117 are extracted. The PID filter 119 extracts the PAT packet 132, the PMT packet 137, the NIT packet 134, the SDT packet 136, and the EIT packet 133 from the transport stream 144 output from the transmission path decoding unit 15.
[0196]
In this way, the PID filter 119 outputs SDT and EIT to the SIT generation processing unit 21. The PID filter 119 includes packets 130 and 138 having program A contents, packets 131 and 135 and 139 having program B contents, PAT packets 132, PMT packets 137, NIT packets 134, SDT packets 136, and EIT packets 133. Is output to the output switching circuit 20.
[0197]
The SIT generation processing unit 21 receives the SDT and EIT output from the PID filter 119, generates SIT packets 141 and 142, and outputs them to the SIT storage 25. The SIT storage 25 outputs the SIT packets 141 and 142 output from the SIT generation processing unit 21 to the SIT packet replacement unit 126.
[0198]
The output switching circuit 20 inputs the transport stream 145 output from the PID filter 119.
[0199]
When the output switching in the output switching circuit 20 is for display, the output switching circuit 20 outputs the display transport stream to the decoding unit 27.
[0200]
The decoding unit 27 decompresses the transport stream for display output from the output switching circuit 20 and outputs it to the display 4 as a signal.
[0201]
The display 4 receives the signal output from the decoding unit 27 and displays the video and audio constituting the program A.
[0202]
When the output switching in the output switching circuit 20 is for recording, the output switching circuit 20 outputs the transport stream 145 to the SIT packet replacer 126.
[0203]
The SIT packet replacer 126 receives the transport stream 145 output from the output switching circuit 20. The SIT packet replacer 126 determines whether or not the NIT packet 134, the packets 131, 135, and 139 having the contents of the program B and the EIT packet 133 are actually replaced with the SIT packets 141 and 142.
[0204]
That is, the SIT packet replacer 126 replaces the NIT packet 134 pointed out by the NIT PID storage 23 with the SIT packet 141 output from the SIT storage 25. Further, the SIT packet replacer 126 replaces the EIT packet 133 pointed out by the second replace PID storage 124 with the SIT packet 142 output from the SIT storage 25. Then, the SIT packet replacer 126 does not replace the packets 131, 135, and 139 having the contents of the program B with the SIT packet (as described above, since the transmission frequency of the EIT packet is sufficient, non-recording is performed). Packets with program content may not be used as replace packets).
[0205]
In this way, the SIT packet replacer 126 replaces the NIT packet 134 with the SIT packet 142 and the EIT packet 133 with the SIT packet 141, and outputs a signal to the packet modification unit 129.
[0206]
The packet modification unit 129 receives the signal output from the SIT packet replacer 126, modifies the PAT packet 132 into the modified PAT packet 140, and modifies the PMT packet 137 into the modified PMT packet 143. Further, the packet modifying unit 29 discards the SDT packet 136, the EIT packet 133, and the packets 131, 135, and 139 having the content of the program B. In this way, the packet modification unit 129 generates the transport stream 146 for recording and outputs it to the recording device 5.
[0207]
The recording device 5 inputs the transport stream 146 output from the packet modification unit 129 and records it.
[0208]
Note that the SIT packet replacer 126 according to the present invention, as in the above-described third embodiment, allows the replacement packet appropriately selected from the packets having the designated replacement PID to be used as the SIT packet. There is no need to replace, and a replace packet selected by a predetermined ratio from all packets having the specified replace PID may be replaced with the SIT packet.
[0209]
In this manner, the SIT packet replacer is provided with the ability to determine whether or not to actually perform the replacement by the SIT packet, and the packet having the content of the non-recorded program and the EIT packet can be replaced by the SIT packet. The problem that the transmission frequency of the NIT packet as the replace packet is insufficient is solved by using the replace packet as a possible packet.
[0210]
  In the embodiment described above, the member that combines the PID filter and the SIT packet replacer is:(Claims)This corresponds to the packet extraction / replacement unit described in the above.
[0211]
Further, the packet stream in the present invention does not need to be composed of ten packets as in the above-described embodiment, and may be composed of an arbitrary number of packets.
[0212]
Further, it is not necessary that only two programs are broadcast as in the above-described embodiment, and an arbitrary number of programs may be broadcast.
[0213]
In addition, two replacement PID storages in the present invention are not necessarily provided as in the above-described embodiment, and only one replacement PID storage may be provided.
[0214]
Further, the digital broadcast in the present invention is not necessarily a broadcast using a communication satellite as in the above-described embodiment, and may be a wired broadcast using an optical fiber or a coaxial cable, or a wireless broadcast.
[0215]
Further, the digital broadcast in the present invention is not necessarily a program broadcast as in the above-described embodiment, and may be a PC game or a karaoke broadcast.
[0216]
【The invention's effect】
As is clear from the above description, the present invention has an advantage that a replacement packet that can be replaced with, for example, a SIT packet can be reliably secured.
More specifically, the first aspect of the present invention corresponding to claim 1 can provide a receiving system characterized in that a replacement packet that can be replaced with an SIT packet can be reliably secured.
[0217]
According to a second aspect of the present invention corresponding to claim 2, in addition to the above-described effect, a receiving system can be provided which can secure a replace packet for each program.
[0218]
The third aspect of the present invention corresponding to claim 3 can provide a receiving system characterized in that, in addition to the above-described effect, a replacement packet can be secured by an instruction from the transmitting system.
[0219]
According to a fourth aspect of the present invention corresponding to claim 4, in addition to the above-described effect, a receiving system can be provided in which a replacement packet can be sufficiently secured by an instruction from the transmission system.
[0220]
According to a fifth aspect of the present invention corresponding to claim 5, in addition to the above-described effect, a receiving system can be provided in which a replacement packet can be secured by the judgment of the receiving system without involvement of the transmitting system. .
[0221]
The sixth aspect of the present invention corresponding to claim 6 can provide a digital broadcasting system characterized in that a replacement packet for each program can be reliably secured.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a digital broadcasting system described in a first embodiment of the present invention.
FIG. 2 is a configuration diagram of a transmission system described in Embodiment 1 of the present invention.
FIG. 3 is a configuration diagram of a receiving system described in the first embodiment of the present invention.
FIG. 4 is a conceptual diagram illustrating a process of generating a recording transport stream described in the first embodiment of the present invention.
FIG. 5 is a block diagram of a digital broadcasting system described in Embodiment 2 of the present invention.
FIG. 6 is a conceptual diagram illustrating a process of generating a transport stream for recording described in the second embodiment of the present invention.
FIG. 7 is a block diagram of a digital broadcasting system described in Embodiment 3 of the present invention.
FIG. 8 is a conceptual diagram illustrating a process of generating a recording transport stream described in the third embodiment of the present invention.
FIG. 9 is a configuration diagram of a conventional digital broadcasting system.
FIG. 10 is a conceptual diagram illustrating a process of generating a transport stream for recording according to a conventional technique.
[Explanation of symbols]
1 Digital broadcasting system
2 Transmission system
3 Receiving system
4 display
5 recording devices
6 Satellite repeater (transponder)
7 Communication satellite
8 Encoding part
9 Program selection data generator
10 Packet multiplexing unit
11 Transmission path encoding unit
12 Modulator
13 Receiver
14 Demodulator
15 Transmission path decoding unit
16 Packet demultiplexer
17 First replace PID storage
18 Record PID storage
19 PID filter
20 Output switching circuit
21 SIT generation processing part
22 Stream transmission processing part
23 NIT PID storage
24 Second replacement PID storage
25 SIT storage
26 SIT packet replacer
27 Decryption unit
28 PID designation part
29 Packet modifier
51 Digital broadcasting system
52 Transmission system
53 Receiving system
59 Program selection related data generator
66 Packet demultiplexing unit
67 First replace PID storage
69 PID filter
72 Stream transmission processing part
74 Second Replace PID Store
76 SIT packet replacer
78 PID specification part
101 Digital broadcasting system
102 Transmission system
103 Receiving system
109 Program selection related data generator
116 Packet demultiplexing unit
117 First replacement PID storage
119 PID filter
122 Stream transmission processing unit
124 Second replacement PID storage
126 SIT packet replacer
128 PID specification part
129 packet modifier
151 Digital broadcasting system
153 Receiving system
166 Packet demultiplexing unit
169 PID filter
172 Stream transmission processing unit
176 SIT packet replacer

Claims (7)

(1) and the content of the compressed and encoded program, (2) and the program specification information which has at least NIT, PAT, the PMT, and multiplexes the service information having at least SDT, the EIT (3), transport A receiver for receiving a transport stream transmitted from a transmission system for generating and transmitting a stream;
The P ID before Symbol N non-IT packets packets, the PID designating section which can be specified as PI D to be replaced,
A replace PID storage for storing the PID designated by the PID designation unit ;
A SIT generation processing unit for generating processing SIT packet before hexa-bis information,
Receiving system is characterized in that a replacement to Rupa packet extracting replacement unit the replacement indicated replace packets with PID storing device, and the NIT packet with the SIT packet. The transmission system generates a dummy packet for replacement in addition to (1) to (3) , inserts the dummy packet into the transport stream, and performs transmission .
The PID designating section, the receiving system of claim 1, wherein specifying the PI D of the dummy packets as PID of the replacement target. The transmission system generates a frequency information of the SIT packet, and sends the frequency information of the SIT packet,
The receiving system according to claim 1 or 2 , wherein the PID designating unit designates the PID to be replaced with reference to frequency information of the SIT packet. Further comprising output switching means for switching output for display / recording of the transport stream received by the receiving unit;
The PID to be replaced designated by the PID designation unit is all or part of the PID of the packet having the content of the non-recorded program,
4. The receiving system according to claim 3, wherein the packet extraction / replacement unit replaces a packet having content of a non- recorded program with the SIT packet . The PID designating section designates the content or EI T or SDT packet, a non-recorded program,
The packet extraction replacement part refers to the frequency information of the previous SL SIT packets, to choose from a packet with the specified P ID by the PID designating section, and characterized in that the re-place with the SIT packet The receiving system according to claim 4 . (1) and the content of the compressed and encoded program, (2) at least NIT, PAT, program specification information with a PMT, (3) Even without least SDT, and multi-duplex and service information having the EIT, trans A transmission system that generates and transmits a port stream;
Specifying a receiver for receiving a transport stream transmitted from the transmission system, a PID of a packet other than the N IT packets, the PID designating section which can designate a PID to be replaced, by the PID designating section and replace PID storing device which stores have been PID, and SIT generation processing unit for generating processing SIT packet before hexa-bis information, indicated replace packets in the replace PID storing device, and said the NIT packet SIT digital broadcasting system characterized by comprising a receiving system having a packet extracting replacement unit to replace the packet. (1) content of a compressed and encoded program; (2) program specification information having at least NIT, PAT, and PMT; and (3) service information having at least SDT and EIT. Receiving the transport stream transmitted from the transmission system that multiplexes the information and generates and transmits the transport stream;
  A PID designation step capable of designating a PID of a packet other than the NIT packet as a PID to be replaced;
  A replacement PID storing step for storing the PID specified by the PID specifying unit;
  A SIT generation processing step of generating a SIT packet from the service information;
A receiving method comprising: a replacement packet instructed in the replacement PID storing step; and a packet extraction and replacement step of replacing the NIT packet with the SIT packet.

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