JP2011123991A - Data-output system, and data recording and outputting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data-output system which allows efficient use of the band of a digital interface, and to provide a data-recording method. <P>SOLUTION: A recording and reproducing device 1 reproduces a multiplexed stream which is recorded on a recording medium as a stream file, and an information file which is recorded on the recording medium separately from the stream file, from the recording medium, respectively. Then, the device 1 outputs, to the outside through the digital interface, the maximum bit rate to be reproduced as the information file from the recording medium, and a transport packet obtained by encoding attached information, prior to the output of the multiplexed stream file. The devices 1 ensures data transmission speed of the digital interface on the basis of the maximum bit rate which is recorded on the recording medium together with the multiplexed stream, and outputs, to the outside through the digital interface, the multiplexed stream to be reproduced from the recording medium. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a data output system, a data recording method, and an output method for recording a multiplexed stream such as a transport stream on a recording medium and outputting the multiplexed stream recorded on the recording medium via a digital interface. is there.

  In digital television broadcasting such as DVB (Digital Video Broadcasting) and DTV (Digital Television), a transport stream of MPEG2 systems (ISO / IEC13818-1) is used for multiplexing. In this transport stream, streams such as video and audio are multiplexed in units of transport packets having a length of 188 bytes. Also, a plurality of independent television program transport packets can be multiplexed in one transport stream.

  FIG. 5 shows a block diagram of a receiving system for receiving digital television broadcasting.

  As shown in FIG. 5, the receiving system for receiving digital television broadcasting includes a receiving device (IRD: Integrated receiver / decoder) 101 for receiving a transport stream, and a transport packet of a television program to a storage medium. And a transport stream recording / reproducing device 102 for recording / reproducing. The IRD 101 and the transport stream recording / reproducing device 102 are each connected to a digital interface to transmit and receive transport packets. For example, IEEE 1394 adapters 103 and 104 are connected to the IRD 101 and the transport stream recording / reproducing apparatus 102, respectively, and transport packets are transmitted and received through the IEEE 1394 interface.

  In the transport stream received by the IRD 101, for example, transport packets of a plurality of television programs are multiplexed. When the transport packet received by the IRD 101 is transmitted to the transport stream recording / playback apparatus 102 and recorded on the storage medium, the IRD 101 receives the transport packet of the one or more television programs selected by the user. Extract from the port stream. A stream composed of transport packets extracted by the IRD 101 is referred to as a partial transport stream. This partial transport stream is isochronous transferred from the IRD 101 to the transport stream recording / reproducing device 102 via the IEEE1394 interface and recorded on the storage medium. When digital television broadcasting transmits a transport stream using the statistical multiplexing method, the partial transport stream is transferred at a variable bit rate.

  Here, when transport packets of one or several television programs are extracted from a transport stream in which a plurality of television programs are multiplexed, the extracted transport packets are irregularly spaced. Will appear.

  As shown in FIG. 6, it is assumed that transport packets of a plurality of channels (for example, four channels of program A to program D) are multiplexed in a transport stream transmitted via a satellite. If, for example, a transport packet of program A is extracted from the transport stream transmitted via this satellite, the generation timing of each transport packet (Ai) becomes irregular. For example, in the example of FIG. 6, the intervals t1, A2, and A3 of the transport packets A1 and A2 of the program A, the intervals t3 of A3 and A4, and the intervals t4 of A4 and A5 are irregular.

  Therefore, in the conventional transport stream recording / reproducing apparatus 102, when the transport packet Ai extracted in this way is recorded on the storage medium, the capacity of the storage medium cannot be effectively used if the respective intervals are set. Each transport packet Ai is recorded with a close interval.

  However, if the transport packet Ai recorded at a short interval is reproduced as it is, its output timing becomes different from the transmitted timing, and T-STD (Transport-System Target Decoder) defined in MPEG2 is used. The input timing of the T-STD is different from that at the time of encoding, the T-STD buffer overflows or underflows, and the T-STD breaks down.

  Therefore, in the conventional transport stream recording / reproducing apparatus 102, in order to match the timing of outputting each transport packet Ai with the transmitted timing, as shown in FIG. Each transport packet is recorded simultaneously with a time stamp TSi synchronized with (Ckicj Refarence).

  Next, a specific configuration example of the conventional transport stream recording / reproducing apparatus 102 will be described. Here, the transport stream recording / reproducing apparatus 102 will be described by taking a consumer use digital VCR (Video Cassette Recorder) using a digital video cassette (DVC) as a storage medium as an example.

  FIG. 7 shows a block configuration diagram of the recording side of the transport stream recording / reproducing apparatus 102.

  As shown in FIG. 7, the transport stream recording / reproducing apparatus 102 has a terminal 111 to which a partial transport stream is input from the IRD 101 via the IEEE1394 interface, and a bit for analyzing the partial transport stream input from the terminal 111. A stream analysis circuit 112, a PLL circuit 113 that generates a 27 MHz clock synchronized with the PCR added to the partial transport stream, and a time that generates a time stamp synchronized with the PCR based on the clock generated from the PLL circuit 113 For each packet of the partial transport stream input via the stamp generation circuit 114 and the bit stream analysis circuit 112, the time stamp generated from the time stamp generation circuit 114 is displayed. And a time stamp adding circuit 115 for adding a stamp.

  Further, the transport stream recording / reproducing apparatus 102 multiplexes the smoothing buffer 116 for temporarily storing the data stream to which the time stamp is added by the time stamp adding circuit 115, and the data stream and the stuffing byte stored in the smoothing buffer 116. The data stream multiplexed with the stuffing bytes, the ECC circuit 118 for adding an error correction code to the data stream multiplexed with the stuffing byte, and the data stream with the error correction code added thereto are stored. And a recording circuit 119 for recording on the medium 120.

  The partial transport stream input from the terminal 111 is input to the bit stream analysis circuit 112. When the transport packet constituting the partial transport stream includes a PCR that is a reference reference time of the bit stream, the bit stream analysis circuit 112 reads the PCR. This transport packet is supplied from the bit stream analysis circuit 112 to the time stamp addition circuit 115. The PCR is supplied from the bit stream analysis circuit 112 to the PLL circuit 113.

  The PLL circuit 113 generates a clock having a frequency of 27 MHz in synchronization with the input PCR, and outputs the clock to the time stamp generation circuit 114. The time stamp generation circuit 114 counts the input clock, generates a time stamp (time_stamp_counter) corresponding to the count value, and outputs this to the time stamp addition circuit 115.

  The time stamp addition circuit 115 adds the time stamp supplied from the time stamp generation circuit 114 to each packet of the partial transport stream supplied from the bit stream analysis circuit 112. Specifically, as shown in FIG. 8, the time stamp adding circuit 115 adds 3 bytes of TSP_extra_header to 187 bytes excluding the first one byte of the 188-byte transport packet. A block of 190 bytes in total is generated. In TSP_extra_header, as shown in FIG. 9, a 21-bit time stamp (time_stamp_counter) is arranged after the 3-bit reserved area. This time stamp (time_stamp_counter) represents the scheduled arrival time of the first bit of the first byte of the transport packet at the input of the smoothing buffer defined in ISO / IEC13818-1. The format shown in FIG. 8 is a format in the case where the transport stream recording device is a consumer-use digital VCR (Video Cassette Recorder), and different formats are used as long as the recording device supports different recording media. Become.

  The data output from the time stamp addition circuit 115 is input to the multiplexing circuit 117 via the smoothing buffer 116. The smoothing buffer 116 outputs data at a predetermined bit rate when data is stored, and outputs no data when the data is not stored and is empty. In order to record data at a constant bit rate defined in the format of the digital VCR, the multiplexing circuit 117 inserts stuffing bytes as dummy data when no data is stored in the smoothing buffer 116 (bytes). The output bit rate is set to a predetermined recording rate (by stuffing). That is, if the bit rate of the transmitted partial transport stream is smaller than a predetermined fixed recording rate, the multiplexing circuit 117 inserts dummy data so that the data to be recorded has a predetermined recording rate. For example, in the standard television mode, there are three digital VCR recording modes: SD mode (25 Mbps), 1 / 2-SD mode (12.5 Mbps), and 1 / 4-SD mode (6.25 Mbps). . In DVB, since most programs are sent at a rate of 9 Mbps or less, the 1 / 2-SD mode is the most used mode in the transport stream recording / reproducing apparatus 102. That is, the multiplexing circuit 117 outputs, for example, data with a bit rate of 12.5 Mbps.

  The stream output from the multiplexing circuit 117 is added with an error correction code by the ECC circuit 118, supplied to the recording circuit 119, and recorded on the storage medium 120 by the recording circuit 119.

  Next, FIG. 10 shows a block configuration diagram on the playback side of the transport stream recording / playback apparatus 102.

  As shown in FIG. 10, the transport stream recording / reproducing apparatus 102 includes a reproduction circuit 121 that reproduces a data stream recorded on the storage medium 120, and an ECC circuit that performs error correction processing on the data stream reproduced by the reproduction circuit 121. 122, a separation circuit 123 that separates the stuffing bytes from the error-corrected data stream to make only the partial transport stream, and is added to each packet from the partial transport stream separated by the separation circuit 123. And a time stamp separating circuit 124 for separating the time stamps.

  The transport stream recording / reproducing apparatus 102 includes a clock generation circuit 125 that generates a 27 MHz clock signal by free-running, and a clock generation circuit at a timing reset by the first time stamp separated by the time stamp separation circuit 124. The timing generation circuit 126 that counts the clock generated by the time 125, the comparison circuit 127 that compares the time stamp separated by the time stamp separation circuit 124 and the count value counted by the timing generation circuit 126, and the time stamp separation circuit 124 And an output control circuit 128 that outputs each packet of the partial transport stream from which the time stamp is separated from the terminal 129 at a timing based on the comparison result of the comparison circuit 127.

  The transport stream recording / reproducing apparatus 102 detects a recording rate recorded on the storage medium 120 and supplies information on the recording rate to the IEEE 1394 interface via the control terminal 131. It has.

  When reading a partial transport stream recorded on the storage medium 120, first, the playback circuit 121 reads information indicating the recording mode of the partial transport stream from the storage medium 120. The read information indicating the recording mode is error-corrected by the ECC circuit 122 and then supplied to the CPU 130. The CPU 130 supplies a control signal indicating the recording mode to the IEEE 1394 adapter 104 based on the supplied information indicating the recording mode. The IEEE 1394 adapter 104 reserves the data transfer rate of the digital interface according to the recording mode. For example, when the recording mode is the 1 / 2-SD mode, a data transfer rate of 12.5 Mbps is reserved.

  Subsequently, the transport stream reproduced from the storage medium 120 by the reproduction circuit 121 is subjected to error correction by the ECC circuit 122 and then the stuffing bytes are removed by the separation circuit 123. The transport packet from which the stuffing bytes are removed is input to the time stamp separation circuit 124, where it is separated into a transport packet and a time stamp (time_stamp_counter). The transport packet is supplied to the output control circuit 128, and the time stamp (time_stamp_counter) is supplied to the comparison circuit 127 and the timing generation circuit 126.

  The timing generation circuit 126 counts a clock having a frequency of 27 MHz generated by the clock generation circuit 125 by using a time stamp (time_stamp_counter) value as an initial value, and outputs the count value (that is, time stamp) to the comparison circuit 127. To do. The comparison circuit 127 controls the output control circuit 128 when the value of the time stamp (time_stamp_counter) supplied from the time stamp separation circuit 124 matches the value of the counter supplied from the timing generation circuit 126, and the time stamp The transport packet supplied from the separation circuit 124 is output from the terminal 129.

  For example, when the partial transport stream shown in FIG. 6 is recorded in the storage medium 120, the comparison circuit 127 outputs the transport packet A1 when the counter value output from the timing generation circuit 126 becomes TS1. When the counter value reaches TS2, the transport packet A2 is output from the output control circuit 128. Thereafter, similar processing is performed, and transport packets A3, A4, and A5 are output. Therefore, the transport packet Ai is output at the same timing as that at the time of encoding. As a result, the T-STD is prevented from failing.

  Then, the partial transport stream output from the transport stream recording / reproducing apparatus 102 is isochronous transferred from the IEEE 1394 adapter 104 to the IEEE 1394 adapter 103. The IEEE 1394 adapter 103 inputs the received transport stream to the IRD 101. The IRD 101 decodes the transport stream and reproduces video and audio signals.

JP-A-8-339630 JP-A-9-139914 Japanese Patent Laid-Open No. 10-200854 International Publication No. 95/26552 Pamphlet JP-A-8-46907 JP-A-5-245784 JP-A-4-252427 JP-A-5-227477 JP 7-6498 A,

  However, as described above, in the conventional transport stream recording / reproducing apparatus 102, when the input transport stream is recorded, the bit rate of the transport stream may be smaller than the predetermined fixed recording rate by the multiplexing circuit 117. For example, dummy data is inserted to record data at a predetermined recording rate. Further, when the conventional transport stream recording / reproducing apparatus 102 outputs the partial transport stream recorded on the storage medium 120 to the digital interface, the data transfer rate of the digital interface is reserved at the predetermined recording rate. It was.

  Therefore, in the conventional transport stream recording / reproducing apparatus 101, the maximum bit rate of the partial transport stream obtained by removing the dummy data from the recorded data is equal to the predetermined recording rate (for example, 1 / 2-SD mode). Even if the frequency is smaller than 12.5 Mbps), the size of the predetermined recording rate is reserved as the data transfer rate of the digital interface and the transport stream is output, and the bandwidth of the digital interface is unnecessarily occupied. It was.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a data output system and a data recording and output method that can efficiently use the bandwidth of a digital interface.

  A data output system according to the present invention includes a multiplexed stream obtained by multiplexing an encoded stream, bit rate detection means for detecting a maximum bit rate of the input multiplexed stream, and the multiplexed stream from the multiplexed stream. Attached information detecting means for detecting attached information of the multiplexed stream, the input multiplexed stream is recorded on a recording medium as a stream file, the maximum bit rate detected by the bit rate detecting means, and the attached information Recording means for recording the attached information detected by the detecting means as the same information file on the recording medium separately from the stream file, a multiplexed stream recorded by the recording means from the recording medium, and the information file And reproducing means for reproducing Digital transmission means for outputting the reproduced multiplexed stream to the outside via a digital interface, wherein the digital transmission means encodes the maximum bit rate and the auxiliary information reproduced from the recording medium as the information file. The transport packet is output to the outside via the digital interface prior to the output of the multiplexed stream, and the data transfer rate of the digital interface is based on the maximum bit rate recorded on the recording medium together with the multiplexed stream. And the multiplexed stream reproduced from the recording medium is made external via the digital interface.

  Also, the data recording and output method according to the present invention inputs a multiplexed stream in which an encoded stream is multiplexed, detects the maximum bit rate of the input multiplexed stream, and further detects the multiplexed signal from the multiplexed stream. And the input multiplexed stream is recorded on a recording medium as a stream file, and the detected maximum bit rate and the attached information are set as the same information file, Separately, the multiplexed stream recorded on the recording medium as a stream file and the information file recorded on the recording medium separately from the stream file are reproduced from the recording medium, respectively. The above-mentioned information file that is reproduced from the recording medium The transport packet encoded with the bit rate and the attached information is output to the outside via the digital interface prior to the output of the multiplexed stream, and the maximum bit rate recorded on the recording medium together with the multiplexed stream. The data transfer speed of the digital interface is ensured based on the above, and the multiplexed stream reproduced from the recording medium is output to the outside through the digital interface.

  According to the present invention, a multiplexed stream recorded on a recording medium as a stream file and an information file recorded on the recording medium separately from the stream file are reproduced from the recording medium, respectively, and the information file is recorded as the information file. The transport packet encoded with the maximum bit rate and the attached information reproduced from the recording medium is output to the outside via the digital interface prior to the output of the multiplexed stream, and is recorded together with the multiplexed stream. Since the data transfer rate of the digital interface is ensured based on the maximum bit rate recorded in the above, the band of the digital interface that outputs the multiplexed stream reproduced from the recording medium can be used efficiently.

It is a block diagram of the recording system of the transport stream recording / reproducing apparatus of embodiment of this invention. It is a figure which shows the file format of the attached information and the maximum bit rate information which the transport stream recording / reproducing apparatus of embodiment of this invention records on a storage medium. It is a block diagram of the reproduction system of the transport stream recording / reproducing apparatus of the embodiment of the present invention. It is a figure which shows the receiving apparatus which transmits a transport stream via the transport stream recording / reproducing apparatus of embodiment of this invention, and an IEEE1394 interface. It is a block diagram which shows the receiving system which receives a digital television broadcast. It is a figure explaining the stream which extracted the transport packet of arbitrary channels from the stream by which the some transport stream transmitted via a satellite was multiplexed, and the stream. It is a block diagram of a recording system of a conventional transport stream recording / reproducing apparatus. It is a figure explaining the data format which the conventional transport stream recording / reproducing apparatus records on a storage medium. It is a figure explaining the time stamp recorded on the data which the conventional transport stream recording / reproducing apparatus records on a storage medium. It is a block diagram of a reproduction system of a conventional transport stream recording / reproduction apparatus.

  Hereinafter, a transport stream recording / reproducing apparatus according to an embodiment of the present invention will be described.

  A transport stream recording / reproducing apparatus according to an embodiment of the present invention described below records a multiplexed stream broadcast by digital television broadcasting such as DVB (Digital Video Broadcasting) and DTV (Digital Television) on a recording medium. Also, it is an apparatus for reproducing recorded data. For example, this transport stream recording / reproducing apparatus is connected to an IRD via an IEEE 1394 digital interface as described in the prior art. Then, the partial transport stream supplied from the IRD via the IEEE 1394 digital interface is recorded on a recording medium, and the partial transport stream recorded on the recording medium is reproduced and supplied to the IRD via the IEEE 1394 digital interface. Output to the outside. That is, the apparatus can be used in place of the conventional transport stream recording apparatus 101 shown in FIG.

  FIG. 1 is a block diagram of the recording side of the transport stream recording / reproducing apparatus 1 according to the embodiment of the present invention. The transport stream recording / reproducing apparatus 1 is a consumer use digital VCR (Video Cassette Recorder) using a digital video cassette (DVC) as a storage medium.

  As shown in FIG. 1, the transport stream recording / reproducing apparatus 1 has a terminal 2 to which a partial transport stream is input from the IRD via the IEEE1394 interface, and a bit for analyzing the partial transport stream input from the terminal 2 The stream analysis circuit 3, the PLL circuit 4 that generates a 27 MHz clock synchronized with the PCR added to the partial transport stream, and the time that generates a time stamp synchronized with the PCR based on the clock generated from the PLL circuit 4 A stamp generation circuit 5; a bit rate calculation circuit 6 for calculating a bit rate of the input partial transport stream; and a partial transport input via the bit stream analysis circuit 3 and the bit rate calculation circuit 6. And a time stamp adding circuit 7 to add a time stamp generated from the time stamp generating circuit 5 with respect to each packet over preparative stream.

  Further, the transport stream recording / reproducing apparatus 1 includes an error correction code in a smoothing buffer 8 for temporarily storing a data stream to which a time stamp is added by a time stamp adding circuit 7, a partial transport stream stored in the smoothing buffer, and the like. And a recording circuit 10 for recording the partial transport stream to which the error correction code is added to the storage medium 11.

  The partial transport stream input from the terminal 2 is input to the bit stream analysis circuit 3. The bit stream analysis circuit 3 receives the leak buffer size information on the receiving side from the input partial transport stream, the output bit rate information from the leak buffer on the receiving side, and broadcast provider information (hereinafter these information is referred to as attached information). And the attached information is supplied to the recording circuit 10 via the ECC circuit 9. Further, the bit stream analysis circuit 3 reads the PCR when the transport packet constituting the partial transport stream includes a PCR that is the reference reference time of the bit stream. The transport packet is supplied from the bit stream analysis circuit 3 to the bit rate calculation circuit 6. The PCR is supplied from the bit stream analysis circuit 3 to the PLL circuit 4.

  The bit rate calculation circuit 6 calculates the bit rate of the transport stream between the two transport packets including the PCR. The bit rate calculation circuit 6 calculates the maximum value of the bit rates between the two transport packets including the PCR to obtain the maximum bit rate information. That is, the maximum bit rate of the partial transport stream to be recorded is calculated. The bit rate calculation circuit 6 supplies this maximum bit rate information to the recording circuit 10 via the ECC circuit 9. The transport packet whose bit rate has been calculated is supplied to the time stamp addition circuit 7.

  The PLL circuit 4 generates a clock having a frequency of 27 MHz in synchronization with the input PCR, and outputs the clock to the time stamp generation circuit 5. The time stamp generation circuit 5 counts the input clock, generates a time stamp (time_stamp_counter) corresponding to the count value, and outputs this to the time stamp addition circuit 7.

  The time stamp addition circuit 7 adds the time stamp supplied from the time stamp generation circuit 5 to each packet of the partial transport stream supplied from the bit rate calculation circuit 6. Specifically, as shown in FIG. 8 in the description of the prior art, the time stamp addition circuit 7 adds 3 bytes to 187 bytes excluding the first one byte of the 188-byte transport packet. A TSP_extra_header for bytes is added to generate a block of 190 bytes in total. In TSP_extra_header, a 21-bit time stamp (time_stamp_counter) is arranged after the 3-bit reserved area as shown in FIG. This time stamp (time_stamp_counter) represents the scheduled arrival time of the first bit of the first byte of the transport packet at the input of the smoothing buffer defined in ISO / IEC13818-1.

  The data output from the time stamp addition circuit 7 is input to the smoothing buffer 8. The smoothing buffer 8 outputs data at a predetermined bit rate when data is stored, and outputs no data when the data is not stored and is empty. The stream output from the smoothing buffer 8 is supplied with an error correction code by the ECC circuit 9 and supplied to the recording circuit 10, and is recorded on the storage medium 11 by the recording circuit 10.

  Here, the transport stream recording / reproducing apparatus 1 records data at a constant bit rate defined in the format of the digital VCR. In particular, the stuffing byte is not recorded as dummy data. That is, if data is stored in the smoothing buffer 8, data is recorded at a constant bit rate, but if no data is stored in the smoothing buffer 8, data recording is stopped.

  Further, in the transport stream recording / reproducing apparatus 1, when recording of the program of the input partial transport stream is completed, the auxiliary bit detected by the bit stream analyzing circuit 3 and the maximum bit rate obtained by the bit rate calculating circuit 6 Information is recorded on the storage medium 11 by the recording circuit 10 after the error correction code is added by the ECC circuit 9. The attached information and maximum bit rate information may be filed separately from the program and recorded in a TOC (Table Of Contents) or the like, or may be recorded as header information of the program.

  FIG. 2 shows an example of a method for recording these attached information and maximum bit rate information.

  For example, as shown in FIG. 2, the transport stream recording / reproducing apparatus 1 records a file (mux_information_file) of attached information and maximum bit rate information as a recorded partial transport stream file (AV program file (clip)). Separate files.

  In mux_information_file, for example, max_program_rate (maximum bit rate information), max_sb_size (reception side leak buffer size information), max_sb_leak_rate (reception side leak buffer output bit rate information), and broadcast_information (broadcast provider information) are stored.

  max_program_rate represents the maximum value in the chunk of maximum_bitrate defined by the maximum_bitrate_descriptor of ISO / IEC13818-1. When the maximum_bitrate_descriptor does not exist in the clip (program file of the recorded transport stream), max_program_rate is defined as the maximum value in the clip of program_rate given by the following equation (1).

program_rate = ((ji) * system_clock_frequency)) / (PCR (j) -PCR (i)) (1)
In the above formula (1), i represents the index number of the byte including the last bit of the base field of the newest program_clock_reference applied to the program to be decoded. Further, j indicates the index number of the byte including the last bit of the base field of program_clock_reference that immediately follows, which is applied to the program to be decoded. The relationship between i and j is i <j. PCR (i) indicates the time encoded in the base field and the extension field in the unit of the system clock.

  max_sb_leak_rate indicates the maximum value in the clip of sb_leak_rate defined in the smoothing_buffer_descriptor of ISO / IEC13818-1. If there is no smoothing_buffer_descriptor in the clip, set all bit fields of max_sb_leak_rate to '1b'. In this case, max_sb_leak_rate has no meaning.

  max_sb_size represents the maximum value in the clip of sb_size defined in smoothing_buffer_descriptor of ISO / IEC13818-1. If there is no smoothing_buffer_descriptor in the clip, set all bit fields of max_sb_size to '1b'. In this case, max_sb_size has no meaning.

  broadcast_information indicates broadcast provider information. This is used to determine the output destination IRD of the transport stream recorded on the storage medium 11.

  Next, FIG. 3 shows a block configuration diagram on the reproduction side of the transport stream recording / reproducing apparatus 1.

  As shown in FIG. 3, the transport stream recording / reproducing apparatus 1 includes a reproduction circuit 12 that reproduces a data stream recorded on the storage medium 11, and an ECC circuit that performs error correction processing on the data stream reproduced by the reproduction circuit 12. 13, a time stamp separating circuit 14 for separating a time stamp added to each packet from a partial transport stream subjected to error correction processing, and a transport packet encoder for transporting attached information and maximum bit rate information into a transport packet 15.

  Further, the transport stream recording / reproducing apparatus 1 includes a clock generation circuit 16 that generates a 27 MHz clock signal by free-running, and a clock generation circuit at a timing reset by the first time stamp separated by the time stamp separation circuit 14. 16 includes a timing generation circuit 17 that counts the clock generated by 16, a comparison circuit 19 that compares the time stamp separated by the time stamp separation circuit 14 and the count value counted by the timing generation circuit 17, and the time stamp separation circuit 14. And an output control circuit 19 that outputs each packet of the partial transport stream from which the time stamp is separated from the terminal 20 at a timing based on the comparison result of the comparison circuit 19.

  In addition, the transport stream recording / reproducing apparatus 1 includes a central processing unit (CPU) 21 that supplies attached information and maximum bit rate information recorded on the storage medium 11 as control signals to the IEEE 1394 interface via the control terminal 22. ing.

  When reading a partial transport stream recorded on the storage medium 11, first, the playback circuit 12 reads attached information and maximum bit rate information from the TOC of the storage medium 11. The read accessory information and maximum bit rate information are error-corrected by the ECC circuit 13 and then supplied to the CPU 21. The CPU 21 generates a control signal based on the supplied information and supplies it to the IEEE 1394 adapter 104.

  The three pieces of information (max_sb_leak_rate, max_sb_size, max_program_rate) indicated in the attached information are sent to the IRD via the IEEE1394 interface and used when the transport stream recorded on the storage medium 11 is IEEE1394 isochronous transferred. For example, as shown in FIG. 4, max_program_rate indicates a bit rate necessary for IEEE1394 isochronous transfer, max_sb_size indicates a leak buffer size required when the receiving side records the transport stream, and max_sb_leak_rate indicates a leak This is the output bit rate from the buffer and indicates the maximum recording bit rate required on the receiving side.

  The maximum bit rate information is supplied to the IEEE 1394 adapter connected to the transport stream recording / reproducing apparatus 1. The IEEE 1394 adapter 104 reserves the data transfer rate of the digital interface according to the maximum bit rate information. For example, if the maximum bit rate is 5 Mbps, a data transfer rate of 5 Mbps is reserved.

  The attached information and the maximum bit rate information are input to the transport packet encoder 15 and encoded into a transport packet having the attached information and the maximum bit rate information as data. The max_program_rate is encoded into a transport packet having ISO / IEC13818-1 maximum_bitrate_descriptor data. These transport packets are input to the output control circuit 19. The transport packet in which the auxiliary information and the maximum bit rate information are encoded is output prior to the output of the transport stream of the AV program. Further, these transport packets may be transmitted during the transmission of the AV program. In this case, a data transfer rate of a size that secures a margin for transmitting a transport packet having data of attached information and maximum bit rate information is reserved in advance in the digital interface. Also, when the bit rate of the AV program being transmitted is low and the bit rate of the AV program is low with respect to the reserved data transfer rate of the digital interface, there is room for transmission. A transport packet having data may be transmitted.

  Subsequently, the transport stream reproduced from the storage medium 11 by the reproduction circuit 12 is subjected to error correction by the ECC circuit 13, and then input to the time stamp separation circuit 14, where the transport packet and the time stamp (time_stamp_counter) and Separated. The transport packet is supplied to the output control circuit 19, and the time stamp (time_stamp_counter) is supplied to the comparison circuit 18 and the timing generation circuit 17.

  The timing generation circuit 17 counts a clock having a frequency of 27 MHz generated by the clock generation circuit 16 with a counter using the time stamp (time_stamp_counter) as an initial value, and outputs the count value (ie, time stamp) to the comparison circuit 18. To do. The comparison circuit 18 controls the output control circuit 19 when the value of the time stamp (time_stamp_counter) supplied from the time stamp separation circuit 14 and the value of the counter supplied from the timing generation circuit 17 match, and the time stamp The transport packet supplied from the separation circuit 14 is output from the terminal 20. Therefore, the transport packet is output at the same timing as that at the time of encoding. As a result, the T-STD is prevented from failing.

  The partial transport stream output from the transport stream recording / reproducing apparatus 1 is isochronously transferred from the IEEE 1394 adapter on the transport stream recording / reproducing apparatus 1 side to the IEEE 1394 adapter on the IRD side. The IEEE 1394 adapter on the IRD side inputs the received transport stream to the IRD. The IRD decodes the transport stream and reproduces video and audio signals.

  As described above, the transport stream recording / reproducing apparatus 1 according to the embodiment of the present invention detects the maximum bit rate information of the transport stream and records the maximum bit rate information on the storage medium 11 together with the transport stream. Then, the maximum bit rate information is reproduced from the storage medium 11 together with the recorded transport stream, and the maximum bit rate information is transmitted to the IEEE 1394 adapter as a digital interface to ensure the data transfer speed. As a result, the transport stream recording / reproducing apparatus 1 according to the embodiment of the present invention can ensure the data transfer rate of the IEEE 1394 interface, which is a digital interface, and efficiently use the bandwidth.

  DESCRIPTION OF SYMBOLS 1 Transport stream recording / reproducing apparatus, 2, 20, 22 terminal, 3 bit stream analysis circuit, 5 Time stamp generation circuit, 6 Bit rate calculation circuit, 7 Time stamp addition circuit, 8 Smoothing buffer, 10 Recording circuit, 11 Storage media , 12 reproduction circuit, 14 time stamp separation circuit, 15 transport packet encoder, 17 timing generation circuit, 18 comparison circuit, 19 output control circuit, 21 central processing unit

Claims (4)

A bit rate detecting means for inputting a multiplexed stream obtained by multiplexing the encoded stream and detecting a maximum bit rate of the inputted multiplexed stream;
Ancillary information detecting means for detecting adjunct information of the multiplexed stream from the multiplexed stream;
The input multiplexed stream is recorded on a recording medium as a stream file, and the maximum bit rate detected by the bit rate detection means and the auxiliary information detected by the auxiliary information detection means are the same information file. Recording means for recording on the recording medium separately from the stream file;
Reproduction means for reproducing each of the multiplexed stream recorded by the recording means from the recording medium and the information file;
Digital transmission means for outputting the multiplexed stream reproduced by the reproduction means to the outside via a digital interface;
The digital transmission means transmits the transport packet encoded with the maximum bit rate and the attached information reproduced from the recording medium as the information file to the outside via the digital interface prior to output of the multiplexed stream. The data stream of the digital interface is secured based on the maximum bit rate recorded on the recording medium together with the multiplexed stream, and the multiplexed stream reproduced from the recording medium is transmitted via the digital interface. Data output system.   2. The data output according to claim 1, wherein said digital transmission means reserves in advance a data transfer rate of a size that secures a margin for transmitting a transport packet having data of attached information and maximum bit rate information. system.   In the digital transmission means, the bit rate of the multiplexed stream is low with respect to the reserved data transfer rate of the digital interface in a time zone where the bit rate of the multiplexed stream being transmitted is low. 2. The data output system according to claim 1, wherein a transport packet having the data of the attached information is transmitted. Input a multiplexed stream in which the encoded stream is multiplexed,
Detect the maximum bit rate of the input multiplexed stream,
Further, the auxiliary information of the multiplexed stream is detected from the multiplexed stream,
The input multiplexed stream is recorded on a recording medium as a stream file, and the detected maximum bit rate and the attached information are recorded on the recording medium separately from the stream file as the same information file,
The multiplexed stream recorded on the recording medium as a stream file and the information file recorded on the recording medium separately from the stream file are reproduced from the recording medium, respectively.
The transport packet encoded with the maximum bit rate and the attached information reproduced from the recording medium as the information file is output to the outside via the digital interface prior to the output of the multiplexed stream,
The data transfer speed of the digital interface is secured based on the maximum bit rate recorded on the recording medium together with the multiplexed stream, and the multiplexed stream reproduced from the recording medium is externally transmitted via the digital interface. Data recording and output method for output.

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