JP2001268518A - Data recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data recording and reproducing device capable of executing reproduction by using a common reproducing stream sending rate independently of the bit rate of a stream. SOLUTION: The data recording and reproducing device is provided with a packet selection part 13 for identifying the packet ID of an MPEG2 transport stream and selecting a PCR packet, a recording buffer 14 for storing the identified packet, a packet generation part 15 for generating a time stamp packet using time as information, and a packet insertion part 16 for inserting the time stamp packet into the transport stream. The device is provided also with a recording/reproducing control part 17 for recording the packet inserted transport stream and controlling reproduction, a time stamp packet selection part 20 for identifying the time stamp packet from data outputted from a reproducing buffer 19, a control part 21 for controlling the reading of data from the buffer 19 on the basis of the time stamp, and an output control part 22 for outputting the read data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus for extracting and recording and reproducing one data from multiplexed data obtained by time-division multiplexing a plurality of data.

[0002]

2. Description of the Related Art MPEG (Moving Picture Expert Group)
MPEG2 (international standard ISO / I)
EC13818-1) is an encoding method for compressing digital video signals and digital audio signals. MP
EG2 employs a time division multiplexing method using packets. For example, when multiplexing a video signal and an audio signal using this method, the video signal and the audio signal are divided into streams of appropriate length called packets, and the video signal packet and the audio signal packet are appropriately divided. Switch to time division transmission.

Further, MPEG2 employs a multiplexing / demultiplexing method compatible with multiprogramming in order to realize transmission of a plurality of program data. For example, if this method is used, not only a video signal and an audio signal constituting one program data can be transmitted in a time division manner, but also a video signal and an audio signal constituting a plurality of programs can be transmitted in a time division manner.

[0004] As one of such multiplexing / demultiplexing methods compatible with multiprogramming, there is a method called a transport stream. In this transport stream method, PES packets (Packetized Elementary Strategies) are used.
Ream Packet) is further divided into a plurality of packets, and a plurality of program data is transmitted in a time-division manner. Each packet has a fixed length, and its length is relatively short, specifically 188 bytes. FIG. 12 is a diagram showing the structure of an MPEG-2 transport stream (TS).

[0005] Also, a transport stream (TS)
Receiving program data transmitted in a time-division manner using the
In order to reproduce, it is necessary to synchronize between the encoder provided in the transmitting device and the decoder provided in the receiving device (reproducing device). In the transport stream system, in order to synchronize between the encoder and the decoder, a PCR (Prog
Information for setting and calibrating a time reference called a ram clock reference (program clock reference value) is transmitted, and the encoder and the decoder are synchronized based on the PCR.

In order to synchronize the encoder and the decoder using the PCR, it is necessary to accurately manage the value of the PCR and the time at which the PCR arrives at the decoder. Specifically, PCR is 6-byte data, and the
It is necessary to set the value of PCR in the decoder at the time when the last byte of R arrives. Then, the decoder uses the arrival time of the PCR and the value of the PCR to set a STC (System Time Clamp) as a reference for decoding and reproduction in the decoder.
ock: system sync signal) is set or calibrated.

More specifically, the decoder is S
PLL circuit incorporating a TC output counter (Ph
ase Locked Loop circuit). This PLL
The circuit calculates a difference between the PCR value and the STC value each time the PCR arrives, converts the result into a control signal, and performs feedback control based on the control signal. Thus, an STC that completely matches the arrival cycle of the PCR can be created, and synchronization between the encoder provided in the transmitting device and the decoder provided in the receiving device can be established with high accuracy. .

By the way, there has been developed a technique for receiving multiplexed data transmitted using the multiplexing / demultiplexing method of the above-described multiprogramming system and recording the received multiplexed data. Once such technology is established,
For example, a broadcasting station providing a digital satellite broadcasting service multiplexes a plurality of movies recorded by digital signals and transmits the multiplexed movies to each home, and each home records the movies transmitted from the broadcasting stations as digital signals. It becomes possible. Here, two methods have been proposed as a method of recording multiplexed data transmitted using the multiplexing / demultiplexing method of the multiprogramming method.

The first method is to record all transmitted multiplexed data. In this method, since all of the multiplexed data is recorded, there is a problem that the data amount becomes large. In addition, even if unnecessary program data is included in a plurality of multiplexed program data, there is a problem that this cannot be eliminated.

The second method is a method of extracting and recording one program data from the transmitted multiplexed data. If this method is adopted, only necessary program data can be recorded, and the data amount can be reduced. However, when the second method is adopted, there is a problem that when reproducing the recorded program data, the synchronization by the PCR is hindered.

That is, even when the program data once recorded is reproduced, the reproduction time of the PCR and the reproduction time of the PCR are the same as when the multiplexed data transmitted from the transmitting device is received and reproduced.
It is necessary to set or calibrate the STC of the playback device based on the value of CR. However, if one program data is extracted from the time-division multiplexed signal and recorded, the PCR
The relationship between the playback time of the and the PCR value is broken, and P
There is a problem that the STC of the playback device cannot be set or calibrated based on the CR. For these issues,
In the data recording method described in Japanese Patent Application Laid-Open No. H11-275524, in extracting program data from multiplexed data, packet number data indicating the number of packets between the extracted packets is recorded, and the numerical value is referred to at the reproduction stage. Attempts to resolve the problem by restoring the packet interval.

[0012]

However, in such a conventional data recording method, since the bit rate of input data is not taken into consideration, data of different bit rates cannot be reproduced by a common reproducing apparatus. Problems arise. This problem will be described with reference to FIGS.

FIG. 13 is an explanatory diagram showing reception data, recording data, and transmission data when the bit rates at the time of reception and transmission are matched, and FIG. 14 shows the bit rates at the time of reception and transmission. FIG. 9 is an explanatory diagram showing reception data, recording data, and transmission data in the case. Here, it is assumed that data having different bit rates are 27 Mbps (FIGS. 13 and 14) and 9 Mbps (FIG. 14). The 27 MbpS data is a stream in which one TS packet arrives approximately every 0.055 ms, and is 9 MbS.
The data of ps is a stream in which one TS packet arrives about every 0.167 ms. FIG. 13 shows an example in which only a program A is recorded from a TS stream having a bit rate of 27 Mbps in which three programs are multiplexed and transmitted at a bit rate of 27 Mbps using the conventional method.

P in the figure represents one TS packet (188 bytes). The PCR value inside the packet P is the PCR value attached to the TS packet, and needs to match the STC value when this packet arrives at the multifunction peripheral. In the figure, a 27 Mbps clock represents a clock used in PCR and STC, and its interval is constant regardless of the bit rate of the reception data or transmission data. The reception bit rate is the bit rate of the input stream. The program A is extracted from this multiplexed stream, and the number of packets between packets (in FIG. 13, the number of packets = 2) is counted and recorded to be recorded data. In the transmission data, the transmission interval of the stream is restored by inserting empty packets by the number of packets counted in the recording data.

[0015] FIG. 14 is a diagram showing a T multiplexed three programs having a bit rate of 9 Mbps using the conventional method.
27 Mbps by recording only program A from S stream
An example of transmission at a bit rate of As in the case of FIG. 13, program A is extracted from the stream, the number of packets between packets (the number of packets = 2 in FIG. 14) is counted and recorded, and the recorded data is the recorded data.
By inserting empty packets by the number of packets counted in the recording data, the transmission interval of the stream is restored. However, the transmission data in this case is not at the interval indicated by the PCR value.

This is because the number of packets depends on the bit rate at the time of reception, and if the bit rate of the stream to be transmitted is different from that at the time of reception, the stream cannot be transmitted at the correct interval. is there. As described above, for 9 Mbps data, one packet is about 0.167 ms, and for 27 Mbps data,
It is about 0.055 ms. Since the interval between inserted packets differs depending on the bit rate at the time of reception, the time interval between packets cannot be restored from the number of inserted packets.

As described above, when recording the number of packets between the extracted packets, it is necessary to control the bit rate of the transmission stream according to the bit rate of the reception stream. It is difficult to do with a common playback device, for example,
Data obtained by recording CS broadcasts or BS digital broadcasts cannot be reproduced using a common device. In addition, when encoding an analog broadcast and recording it digitally, in response to requests to change the bit rate and extend the recording time, the transmission bit rate of the playback stream must be changed for each bit rate. Must.

The present invention has been made in view of such a problem, and it is an object of the present invention to extract an arbitrary stream from multiplexed data regardless of the bit rate of the stream and reproduce the stream using a common playback stream transmission speed. It is an object of the present invention to provide a data recording / reproducing device capable of performing the following.

[0019]

A data recording / reproducing apparatus according to the present invention comprises: receiving means for receiving desired program data from a plurality of program data; and synchronous detecting means for detecting synchronization of a transport stream in the received MPEG. A packet extracting unit for identifying a packet ID of the transport stream and extracting a specific packet, a recording buffer for storing a packet identified by the packet extracting unit, and an arrival time of the specific packet as information. Packet generating means for generating a time stamp packet, packet inserting means for inserting the time stamp packet generated by the packet generating means into the transport stream, and recording for recording the transport stream after inserting the time stamp packet Medium and the recording medium Recording and reproduction control means for controlling recording and reproduction; a reproduction buffer for storing reproduction data; a time stamp packet extraction means for identifying the time stamp packet from output data of the reproduction buffer; Control means for acquiring a time stamp from a time stamp packet and controlling reading of data from the reproduction buffer based on time information of the time stamp, and output means for outputting data read from the reproduction buffer It is.

Further, the packet inserting means inserts the time stamp packet generated by the packet generating means,
It may be inserted immediately before the specific packet. Further, the specific packet extracted by the packet extracting means is a PCR packet, and the packet generating means outputs a P packet output when the PCR packet is identified.
A reproduction counter that counts a time stamp by using the CR identification signal as a trigger, generates a packet that uses the count value from the reproduction counter as information, and obtains a time stamp from the time stamp extraction unit. Since the transmission timing of the PCR is controlled by comparing with the count value of the reproduction counter, at the time of reproduction, the transmission timing of the reproduction data is adjusted based on the time stamp value. Irrespective of the bit rate, the PCR can be transmitted at the timing of reception.

The specific packet extracted by the packet extracting means is a PCR packet, and the packet generating means includes a PCR obtaining means for obtaining a PCR when the PCR packet is extracted by the packet extracting means. , The PCR that arrived just before the PCR packet
A pre-PCR holding unit for holding a packet, and a PCR for calculating a difference between the PCR value obtained by the PCR obtaining unit and the PCR value held by the pre-PCR holding unit.
A packet having time information based on the difference calculated by the PCR difference calculating means, wherein the control means obtains a time stamp from the time stamp extracting means, and counts the reproduction counter. Since the transmission timing of the PCR is controlled by comparing with the value, the difference between the two PCRs is used as the information of the time stamp packet. Can be reduced.

When the packet is extracted by the packet extracting means, the PCR packet is identified by the adaptation field control flag and the PCR flag of the packet, so that the time stamp packet can be identified without specifying the PID of the PCR. It becomes possible to insert immediately before the PCR packet,
You do not need to know D.

Further, the packet generation means generates a time stamp packet after a fixed time elapses, regardless of the arrival time of the specific packet.
By acquiring a time stamp from the time stamp extracting means and comparing the time stamp with the count value of the reproduction counter, the transmission timing of the data is controlled.
Since the timestamp packet is inserted at a fixed time interval regardless of the CR packet, the transmission interval can be controlled even for a stream such as a data broadcast where no PCR exists.

The packet generating means has a reproduction counter for counting a time stamp triggered by a PCR identification signal output when a PCR packet is identified, and uses the count value from the reproduction counter as information. Generating a packet, and further comprising a dummy data insertion unit for outputting dummy data until the count value becomes equal to the time stamp when the count value output from the reproduction counter is smaller than the obtained time stamp. Thus, data can be output without interruption during reproduction.

If the count value output from the reproduction counter is smaller than the acquired time stamp, the dummy data inserting means may determine whether the transport stream packet can be inserted until the count value becomes equal to the time stamp. Is calculated and dummy data packets are generated and output by the number of data packets, so that data can be output without interruption during reproduction.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a data recording / reproducing apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. As an embodiment of the present invention, a data recording / reproducing apparatus according to the present invention extracts and records desired program data from multiplexed data in which a plurality of program data are time-division multiplexed by a transport stream system in MPEG2. The case where the recorded program data is reproduced will be described as an example.

First, the basic concept of the present invention will be described. According to the present invention, by inserting a special packet (time stamp packet) for storing a PCR value,
An arbitrary stream can be extracted from multiplexed data regardless of the bit rate of the stream. The PCR value indicates an absolute time at which a packet including the PCR value arrives at the decoder. Therefore, the packet interval can be restored regardless of the bit rate.

FIG. 1 is an explanatory diagram of a packet interval restoring method using a PCR value according to the present invention.
1 shows received data, recording data, and transmission data when transmitted at 27 MHz, and FIG. 1B shows transmission data when transmitted at 18 MHz. In FIG. 1A, as in the case of FIG. 14, the received data is a TS stream having a reception bit rate of 9 Mbps in which three programs (program A, program B, and program C) are multiplexed. From this, only program A is extracted and recorded, and a common transmission bit rate independent of the stream (27 MHz in FIG. 1A)
Sending is performed in z).

When extracting program A from the received multiplexed stream, the PCR value added to program A (in FIG. 1,
PCR value = 10) or PCR difference value (PC in FIG. 1)
The time stamp packet 100 holding the R difference value = 10-1 = 9) is inserted and recorded immediately before the packet including the PCR value. When reproducing the recorded data, the PCR in the timestamp packet 100 is referred to
Restore packet intervals. At this time, a clock counter similar to the STC of the decoder is referred to (27 MHz counter in FIG. 1), and the counter value is set to the time stamp packet
PCR value within 0 (PCR value = 10 in FIG. 1) or P
CR difference value (in FIG. 1, PCR difference value = 10-1 = 9)
By sending the dummy data until the data stream matches, the sending interval of the stream can be restored.

FIG. 1B shows an example in which the stream recorded in FIG. 1A is transmitted at a bit rate of 18 Mbps. Also in this case, the interval between the packet having the PCR value = 1 and the packet having the PCR value = 10 is constant.
Also, the PCR value may not be used as the value held in the time stamp packet 100, and it is possible to restore the packet interval of the transmission data by using a clock that does not depend on the bit rate of the stream. This method will be described with reference to FIG.

FIG. 2 is an explanatory diagram of a packet interval restoring method using a system clock according to the present invention. As in the case of FIG. 1, the received data includes three programs (program A,
Program B, Program C) multiplexed reception bit rate 9M
bps TS stream. It is assumed that only program A is extracted and recorded from among them, and is transmitted at a common transmission bit rate (27 MHz in FIG. 2) independent of the stream. For maintaining and restoring the packet interval, a common system clock counter is used when receiving and transmitting the stream. This clock counter is a counter that changes at fixed intervals regardless of the bit rate.

When extracting the program A from the received multiplexed stream, the system clock value of the corresponding TS packet (system clock value = 14 in FIG. 2) or the system clock value of the TS packet containing the PCR that appeared last time (In FIG. 2, the system clock value = 14-1 = 13)
As a time stamp packet 100 and inserted immediately before the corresponding TS packet. When reproducing the recorded data, the PCR packet interval is restored with reference to the value in the time stamp packet 100 and the clock counter.
At the time of transmission, the counter value is the time stamp packet 100
By transmitting the dummy data until the value of the stream matches, the transmission interval of the stream can be restored.

FIG. 3 is a block diagram showing the configuration of the data recording / reproducing apparatus according to the first embodiment of the present invention. The data recording / reproducing device according to the present embodiment can be applied to a television receiver having a digital broadcast receiving function capable of receiving radio waves of digital broadcast.

In FIG. 3, the data recording / reproducing device 10
Is a reception unit 11 (reception unit) for digitally receiving broadcast data, and a synchronization detection unit 12 (synchronization detection unit) for detecting synchronization of the received MPEG-2 transport stream.
And the packet I of the MPEG2 transport stream
D, a packet selecting unit 13 (packet extracting means) for selecting a specific packet, a recording buffer 14 for storing the packet identified by the packet selecting unit 13, and a time using the arrival time of the specific packet as information. A packet generating unit 15 (packet generating unit) for generating a stamp packet, a packet inserting unit 16 (packet inserting unit) for inserting the time stamp packet generated by the packet generating unit 15 into the MPEG2 transport stream, A recording medium 18 for recording an MPEG2 transport stream, a recording / reproduction control unit 17 (recording / reproduction control means) for controlling recording / reproduction on the recording medium 18,
A playback buffer 19 for storing the playback data; a time stamp packet selecting unit 20 (time stamp packet extracting means) for identifying a time stamp packet from the output data of the playback buffer 18; and a time stamp packet selected by the time stamp selecting unit 20. A control unit 21 (control means) for acquiring a time stamp from the reproduction buffer 19 based on the time information of the time stamp and controlling the reading of data from the reproduction buffer 19;
And an output unit 22 (output means) for outputting the data read from the output unit 9.

The receiving section 11 selects a signal received at an input terminal and receives a broadcast program of a desired channel. Upon receiving the recording command, the recording / reproduction control unit 17 controls the recording medium 18 to be in a recording state and records the program received by the reception unit 11. The recording medium 18 includes the recording / reproduction control unit 1
7 records the signal selected by VTR (Vi
deo Tape Recorder) and hard disk drive (H
DD), VDP (Video Disc Player) and MO (Magne
to Optical).

Hereinafter, the operation of the data recording / reproducing apparatus configured as described above will be described. First, the recording operation of the data recording / reproducing device 10 will be described. The data recording / reproducing apparatus 10 receives a terrestrial broadcast, a broadcast television program such as a cable, BS, or CS. Broadcast television programs are:
The signal is received by the receiving unit 11 as a signal including the received broadcast program. The receiving unit 1 receives digital broadcast data transferred from a broadcasting station or the like. Here, the data received by the receiving unit 1 is an MPEG2 transport stream (hereinafter, referred to as TS). The TS has a configuration in which packets including data relating to video and audio are multiplexed, and one packet is 188 bytes. The packet contains
An ID (hereinafter, referred to as PID) for identifying data included in each packet is attached to each packet.

This PID has a unique PID assigned to each packet constituting each program. For example, PID = 0x11 for audio, PID = 0x31 for video, PID = 0x79 for additional data, PID = 0x20 for PCR And so on. By identifying the PID, the viewer can select a desired program. The receiving unit 11
May be a device that receives an analog broadcast and encodes it into an MPEG2 stream. The received TS is synchronized by the synchronization detector 12 and input to the packet selector 13. The packet selecting unit 13 selects a packet having a PID constituting a program desired by the viewer.

The packet selected by the packet selector 13 is input to the recording buffer 14 and is temporarily stored. In the packet insertion unit 16, the recording buffer 14
Is read out, and the read out packet is recorded on the recording medium 18 by the recording / reproduction control unit 17. At this time, data read from the packet insertion unit 16 is performed in packet units. The packet generation unit 15 generates a packet using the data transmission time at the time of reproduction as information. When a generation signal is input from the packet generation unit 15,
Reading from the recording buffer 14 is temporarily suspended, and the generated time stamp packet is output to the recording / reproduction control unit 17. When the output of the time stamp packet is completed, the packet is read from the recording buffer 14 again. Then, the data is recorded on the recording medium 18 by the recording / reproduction control unit 17.

Next, the reproducing operation of the data recording / reproducing apparatus 10 will be described. In the recording / reproduction control unit 17, the recording medium 18
, Packets necessary for reproduction are read out and temporarily stored in the reproduction buffer 19. Time stamp select section 20
Reads a packet from the reproduction buffer 19 and identifies a time stamp packet, and the controller 21 holds the value of the time stamp. When the time of the clock in the control unit 21 matches the time of the time stamp, the packet is read from the reproduction buffer 19. The read packet is output by the output unit 22. If the packet is not a time stamp packet, the packet is continuously read from the reproduction buffer 19 and output until the time stamp packet is identified.

As described above, the data recording / reproducing apparatus 10 of the first embodiment identifies the packet ID of the MPEG2 transport stream, and stores the identified packet in the packet selector 13 for selecting the PCR packet. A recording buffer 14, a packet generating unit 15 for generating a time stamp packet using the arrival time of a specific packet as information, a packet inserting unit 16 for inserting the time stamp packet into a transport stream,
A recording medium 18 for recording a transport stream after packet insertion, a recording / reproducing control unit 17 for controlling recording / reproduction on the recording medium 18, and a reproduction buffer 1 for storing reproduction data
9, a time stamp packet selection unit 20 for identifying a time stamp packet from the output data, a control unit 21 for controlling the reading of data from the reproduction buffer 19 based on the time information of the obtained time stamp, and a data read from the reproduction buffer 19. Output unit 2 for outputting data
2 so that an arbitrary stream can be extracted from the multiplexed data regardless of the bit rate of the stream, and can be reproduced using a common reproduction stream transmission speed.

That is, in the conventional example, the number of packets between the extracted packets in the multiplexed stream is stored, and dummy data corresponding to the number of packets is inserted during reproduction. Therefore, in order to restore the packet interval, it was necessary to output at a bit rate (clock) equal to the bit rate of the input data, and it was necessary to have a different output clock for each stream. . On the other hand, in the present embodiment, a time stamp packet having the arrival time of the PCR packet as information is generated, inserted and recorded immediately before the PCR packet, and at the time of reproduction, based on the information of the time stamp packet. , And the transmission timing of the PCR. Since the timestamp is a numerical value that does not depend on the input / output bit rate, it is possible to restore the packet interval even at a bit rate different from the data bit rate of the input data. Of these, by setting the highest one as the transmission bit rate, it is possible to reproduce with a reproducing apparatus having a common output clock.

Next, a second embodiment of the present invention will be described. The basic configuration of the data recording / reproducing apparatus according to the second embodiment is the same as that shown in FIG. 1, and a description thereof will be omitted. In the second embodiment, the packet generator 15
Generates a packet using the PCR identification signal output when the packet selecting unit 13 identifies the PCR packet as a trigger and using the count value as information,
1 obtains a time stamp from the time stamp selecting unit 20 and compares it with the count value of the reproduction counter to measure the timing of sending the PCR.

FIG. 4 is a block diagram showing the configuration of the packet generator 30 of the data recording / reproducing apparatus according to the present embodiment.
3 is a block diagram illustrating a configuration of the control unit 40. FIG. In FIG. 4, the packet generator 30 includes a recording counter 31 and a time stamp packet generator 32. Also, in FIG.
0 is a time stamp comparison unit 41, a reproduction counter 42,
And a buffer control unit 43.
The packet generation unit 30 and the control unit 40 shown in FIG.
It is used instead of 1.

Hereinafter, the operation of the data recording / reproducing apparatus configured as described above will be described. A description of parts that perform the same operations as those of the data recording / reproducing apparatus according to the first embodiment will be omitted, and only different operations will be described. First, the recording operation of the data recording / reproducing apparatus will be described. As in the data recording / reproducing apparatus of the first embodiment, in FIG.
In the packet selector 13, the T
The S packet is selected and temporarily stored in the recording buffer 14. At the same time, when a PCR packet (a packet whose PID is 0x20 in this embodiment) is identified, the PCR packet identification signal is output to the recording counter 3.
Output to 1. The recording counter 31 starts counting from the start of recording and outputs a count value when the PCR packet identification signal is input. The time stamp packet generation unit 32 generates a time stamp packet using the count value as information. If a packet can be generated, a generation signal is output to the packet insertion unit 16. This information is used to measure data transfer timing during reproduction. A description of the reproduction method will be described later.

In the packet insertion unit 16, the recording buffer 1
4 is read out, and the read out packet is recorded on the recording medium 18 by the recording / reproducing control unit 17. Data read from the packet insertion unit 16 is performed in packet units. Time stamp packet generator 32
When the generation signal is input from the recording buffer 14, the reading from the recording buffer 14 is temporarily suspended, the generated time stamp packet is output to the recording / reproduction control unit 17, and when the output of the time stamp packet is completed, the packet is again output from the recording buffer. Is read. At this time, the packet read from the packet insertion unit 16 is a PCR packet. That is, the time stamp packet is inserted immediately before the PCR packet. Then, the data is recorded on the recording medium 18 by the recording / reproduction control unit 17.

Next, the reproducing operation of the data recording / reproducing apparatus will be described. The recording / reproduction control unit 17 reads out a packet necessary for reproduction from the recording medium 18, and
And is temporarily stored. The buffer control unit 43 controls reading from the reproduction buffer 19.
The read data is identified by the time stamp packet selector 20 as to whether it is a time stamp packet. If the packet is not a time stamp packet, the data is input to the output unit 22 and the output unit 22 outputs reproduced data. If it is determined that the packet is a time stamp packet, the time stamp comparing unit 41 of the control unit 40 holds the value of the time stamp.
The reproduction counter 42 sets the value of the first time stamp as an initial value and starts counting.

When the initial value is set in the reproduction counter 42, a read request is issued from the time stamp comparing section 41 to the buffer control section 43. In response to the request, a read signal is output from the buffer control unit 43 to the reproduction buffer 19, and the data stored in the reproduction buffer 19 is input to the output unit 22 via the time stamp packet selection unit 20, and is reproduced from the output unit 22. Data is output.

When the next time stamp packet is identified, the value of the time stamp is similarly held in the time stamp comparing section 41. In the time stamp comparing section 41, the value (T) of the time stamp and the reproduction counter 42
Are compared, and if they match or T <C,
A read request is issued to the buffer control unit 43, data is output from the reproduction buffer 19, and reproduction data is output from the output unit 22.

In the present data recording / reproducing apparatus, the frequency of the clock for counting the recording counter 31 and the clock for counting the reproduction counter 42 must be equal. The clock to be used may be a 27 MHz clock used for the MPEG2 PCR, or may be another clock. FIG. 6 shows an example of a packet generated by the time stamp packet generation unit 32.

FIG. 6 is a diagram showing the structure of a time stamp packet, in which a flag is set in the most significant bit of the synchronization byte in order to distinguish between a TS packet to be recorded and a time stamp packet. The normal sync byte is 0x47 with 1 byte, but the sync byte attached to the time stamp packet is 0xC7. The time information output by the recording counter 31 from the byte next to the synchronization byte is stored. In FIG. 6, the time stamp is stored as 6-byte data as in the case of the PCR, but the time information may be within 187 bytes, and the data length may be determined so that the designer can easily design. Although FIG. 6 shows an example in which the most significant bit is flagged as the synchronization byte of the time stamp packet, various methods such as changing the PID or changing the header itself are conceivable. Although the packet is 188 bytes, the packet may not be of fixed length but may be of variable length as long as it can be confirmed that the packet is a time stamp packet.

FIG. 7 is an explanatory diagram showing received data, recorded data, and output data of the data recording / reproducing apparatus, showing a data receiving interval at the time of reception, a configuration of recorded data, and a data transfer interval at the time of reproduction. When the user issues a recording instruction for program A, as shown in FIG. 7, only the TS packets constituting program A are recorded, and the TS packets of other programs are discarded. Then, at the time of reproduction, data is continuously output until the time stamp packet is identified. When the time stamp packet is identified, the data output is temporarily stopped. When the time stamp value and the counter value match, the next packet, that is, the PCR packet is transmitted. As is clear from FIG. 7, in the present data recording / reproducing apparatus, it is possible to output a PCR packet at the same timing as that of the received data, so that the program reproduction is not hindered.

Next, a third embodiment of the present invention will be described. The basic configuration of the data recording / reproducing apparatus according to the third embodiment is the same as that of FIG. In the third embodiment, the packet generator 15
Has means for acquiring a PCR when a PCR packet is selected by the packet selecting unit 13 and means for holding a PCR packet that has arrived immediately before the PCR packet, and determines the difference between the two PCR values. The control unit 21 generates a packet serving as time information, obtains a time stamp from the time stamp selecting unit 13, and compares the time stamp with the count value of the reproduction counter 42 to measure the transmission timing of the PCR.

FIG. 8 is a block diagram showing the configuration of the packet generator 50 of the data recording / reproducing apparatus of the present embodiment. The same components as those of the packet generation unit 30 shown in FIG. 4 are denoted by the same reference numerals. Further, the configuration of the control unit of the data recording / reproducing apparatus of the present embodiment is the same as the control unit 40 shown in FIG. 8, the packet generation unit 50 includes a PCR acquisition unit 51 (PCR acquisition unit),
It includes a pre-PCR holding unit 52 (pre-PCR holding unit), a PCR difference calculation unit 53 (PCR difference calculation unit), and a time stamp packet generation unit 32. The packet generation unit 50 and the control unit 40 (see FIG. 5)
They are used in place of the packet generation unit 15 and the control unit 21 in FIG. 3, respectively.

Hereinafter, the operation of the data recording / reproducing apparatus configured as described above will be described. A description of parts that perform the same operations as those of the data recording / reproducing apparatus according to the first embodiment will be omitted, and only different operations will be described. First, the recording operation of the data recording / reproducing apparatus will be described. As in the digital data recording / reproducing apparatus of the first embodiment, in FIG. 3, the packet selecting unit 13 selects the TS packet received by the receiving unit 11 and
4 and temporarily stored. Packet select unit 1
When the first PCR packet is identified in step 3, the PCR
Is held in the PCR acquisition unit 51 of the packet generation unit 50.

FIG. 9 is a diagram showing the structure of the PCR. As shown in this figure, the PCR is a 48-bit area in the option field of the TS,
base area 61 and 9-bit PCR_extension area 6
2 and a 6-bit Stuffing area 6 between the two areas
3 The data of the PCR_base area 63 is 90
The data of the PCR_extention area 61 in KHz unit is
It increases by 1 in units of 27 MHz. The PCR value is counted up in the PCR_extention area 61 by 27.
Increase from 0 to 299 in MHz, then PCR_ex
At the same time as the tention area 61 becomes 0, the PCR_base area 63 increases by 1.

Returning to FIG. 3 and FIG.
When the PCR is acquired, 0 is output from the PCR difference calculation unit 53 and is input to the time stamp packet generation unit 32. The time stamp packet generation unit 32 generates a new packet using the input data as information. The generated packet is inserted immediately before the PCR packet by the packet insertion unit 16 and recorded on the recording medium 18 by the recording / reproduction control unit 17. At the time of identifying the second and subsequent PCR packets, the value (OP) of the immediately preceding PCR held in the PCR acquisition unit 51 is replaced with the previous PCR holding unit 52.
And the new PCR value (NP) is stored in the PCR acquisition unit 51.

In the PCR difference calculation section 53, the two P
Calculate the CR difference. That is, the new PCR value (N
P) minus the previous PCR value (OP) (NP
-OP). The calculation result is input to the time stamp packet generation unit 32. Time stamp packet generator 32
Then, a time stamp packet having the input data as information is generated, and a packet generation signal is input to the packet insertion unit 16. When the generation signal is input, the packet insertion unit 16 inserts the generated packet immediately before the PCR packet, and transfers this packet to the recording / reproduction control unit 17. The recording / reproduction control unit 17 records the packet on the recording medium 18. Here, the difference (NP-OP) calculated by the PCR difference calculation unit 53 is obtained by the following equation (1).

NP-OP = [PCR_base (i) −PCR_base (i−1)] × 300 + [PCR_extention (i) −PCR_extention (i−1)] (1)

Next, the reproducing operation of the data recording / reproducing apparatus will be described. In the recording / reproducing control unit 17, packets necessary for reproduction are read from the storage medium 18,
And is temporarily stored. The buffer control unit 43 controls reading from the reproduction buffer 19.
The read data is identified by the time stamp packet selector 20 as to whether it is a time stamp packet. If the packet is not a time stamp packet, the data is input to the output unit 22, and the output unit 22 outputs reproduced data. If it is determined that the packet is a time stamp packet, the time stamp comparing unit 41 of the control unit 40 holds the value of the time stamp.

The reproduction counter 42 sets the value of the first time stamp as an initial value and starts counting. When the initial value is set in the reproduction counter 42, a read request is issued from the time stamp comparing unit 41 to the buffer control unit 43. In response to the request, a read signal is output from the buffer control unit 43 to the reproduction buffer 19, and the data stored in the reproduction buffer 19 is input to the output unit 22 via the time stamp packet selection unit 20, and is reproduced from the output unit 22. Data is output.

When the next time stamp packet is identified, the time stamp value is held in the time stamp comparing section 41 in the same manner. In the time stamp comparing section 41, the value (T) of the time stamp and the reproduction counter 42
Are compared, and if they match or T <C,
A read request is issued to the buffer control unit 43, and the count value of the reproduction counter 42 is reset.
The buffer control unit 43 issues a read request to the reproduction buffer 19, and the data output from the reproduction buffer 19 is output from the output unit 22. The reproduction counter 42 of this device uses a clock of 27 MHz.

Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, when a packet is selected by the packet selecting unit 13, the PCR packet is identified by the adaptation field control flag and the PCR flag of the packet. The PCR is identified not only from the PID but also from the adaptation field control flag present in the TS packet and the PCR.
By examining the flag, it is possible to identify whether a PCR exists. The structure of the TS is shown in FIG.

In the present data recording / reproducing apparatus, the identification of the PCR packet is not performed from the PID, but from the adaptation field control flag and the PCR flag. The hardware configuration of the data recording / reproducing apparatus is the same as that of the data recording / reproducing apparatuses of the first to third embodiments. In the method of identifying the PCR, the packet selection unit 13 first checks whether the value of the adaptation field control flag (2 bits) in the TS is 11 or 10, and if it is 11 or 10, then the PCR flag (1
Bit). If 1, it can be confirmed that PCR is included. Otherwise, it can be confirmed that PCR is not included.

Next, a fifth embodiment of the present invention will be described. The basic configuration of the data recording / reproducing apparatus according to the fifth embodiment is the same as that shown in FIG. 1, and a description thereof will be omitted. In the fifth embodiment, the packet generation unit 15
However, when a certain time has elapsed, a time stamp packet is generated, and the control unit 21 obtains a time stamp from the time stamp
The transmission timing of the data is measured by comparing the count value with the count value.

FIG. 10 is a block diagram showing a configuration of the packet generator 70 of the data recording / reproducing apparatus of the present embodiment. The same components as those of the packet generation unit 30 shown in FIG. 4 are denoted by the same reference numerals. Further, the configuration of the control unit of the data recording / reproducing apparatus of the present embodiment is the same as the control unit 40 shown in FIG. 10, the packet generator 70 includes a count value setting unit 71, a recording counter 31, and a time stamp packet generator 32. The packet generation unit 70 and the control unit 40 (see FIG. 5) are used in place of the packet generation unit 15 and the control unit 21 in FIG. 3, respectively.

Hereinafter, the operation of the data recording / reproducing apparatus configured as described above will be described. Since the basic operation is the same as that of the data recording / reproducing apparatus of the first embodiment, the description is omitted, and the operation of the packet generator 70 will be described in detail. First, the recording operation of the data recording / reproducing apparatus will be described. As in the data recording / reproducing apparatus of the first embodiment, in FIG. 3, when recording is started, the count value of the recording counter 31 of the packet generation unit 70 is reset. In the count value setting section 71, a predetermined count is set.

The count value setting section 71 compares the count value of the recording counter 31 with the set count value. If the count values match,
The trigger signal is output to the packet insertion unit 16. When a trigger signal is input to the packet insertion unit 16, if the data currently output from the packet insertion unit 16 to the re-recording control unit 17 is a packet break, the count value currently output from the recording counter 31 is used. A trigger signal is issued to the count value setting unit 71 so as to generate a time stamp packet as time information. The count value setting unit 71 instructs the recording counter 31 to output the current count value to the time stamp packet generation unit 32 based on the trigger signal. According to the instruction, the recording counter 31 outputs a count value to the time stamp packet generation unit 32.

In the time stamp packet generator 32,
A time stamp packet using the input count value as information is generated, and when the time stamp packet is generated, a generated signal is input to the packet insertion unit 16. The packet insertion unit 16 transfers the generated time stamp packet to the re-recording control unit 17 using the generated signal as a trigger, and records the time stamp packet on the recording medium 18. Then, the packets stored in the recording buffer 14 are transferred to the re-recording control unit 17 again, and the re-recording control unit 17 records the packets on the recording medium 18.

Next, the reproducing operation of the data recording / reproducing apparatus will be described. The recording / reproduction control unit 17 reads out a packet necessary for reproduction from the recording medium 18, and
And is temporarily stored. The buffer control unit 43 controls reading from the reproduction buffer 19.
The read data is identified by the time stamp packet selector 20 as to whether it is a time stamp packet. If the packet is not a time stamp packet, the data is input to the output unit 22, and the output unit 22 outputs reproduced data. If the packet is identified as a time stamp packet, the time stamp comparing unit 41 holds the value of the time stamp.

In the reproduction counter 42, when the first time stamp packet arrives, the counter is reset and counting is started. When the reproduction counter is reset, a read request is issued from the time stamp comparison unit 41 to the buffer control unit 43. In response to the request, a read signal is output from the buffer control unit 43 to the reproduction buffer 19, and the data stored in the reproduction buffer 19 is input to the output unit 22 via the time stamp packet selection unit 20.

When the next time stamp packet is identified, the value of the time stamp is changed to the time stamp comparing unit 4.
It is held at 1. The time stamp comparing section 41 compares the value (T) of the time stamp with the value (C) of the reproduction counter 42, and if they match or T <C, issues a read request to the buffer control section 43 and performs reproduction. The count value of the counter 42 is reset. The buffer control unit 43 issues a read request to the reproduction buffer 19, and the data output from the reproduction buffer 19 is output from the output unit 22.

Next, a sixth embodiment of the present invention will be described. In the sixth embodiment, when the count value output from the reproduction counter 42 is smaller than the time stamp obtained by the control unit 21, a dummy which performs control to output dummy data until the count value becomes equal to the time stamp is set. It has data insertion means.

FIG. 11 is a block diagram showing a configuration of a data recording / reproducing apparatus according to the sixth embodiment of the present invention. In the description of the present embodiment, the same components as those in FIG. 3 are denoted by the same reference numerals, and the description of the overlapping portions will be omitted. 11, the data recording / reproducing device 80 includes a time stamp packet selecting unit 20, a control unit 21, and an output unit 22.
Between the dummy data generation unit 81 and the output switching unit 82
And a dummy data insertion unit 83 (dummy data insertion means).

The recording method is the same as that of the data recording apparatus according to the first to fifth embodiments, and the description is omitted. The reproduction method is the same as in the first to fifth embodiments up to the point where the time stamp is acquired by the time stamp comparison unit 41.

The time stamp comparing section 41 compares the obtained time stamp (T) with the count value (C) output from the reproduction counter, and if they match or T <C, the present invention is applied to the second embodiment. If so, a read request is issued to the buffer control unit 43. When applied to the third or fifth embodiment, a read request is issued to the buffer control unit 43 and the count value of the reproduction counter 42 is reset. If T> C, it instructs the dummy data generation unit 81 to generate dummy data, and instructs the output switching unit 82 to output the data generated by the dummy data generation unit 81. The output switching unit 82 outputs data according to the instruction, and the output unit 22 outputs reproduced data. When T = C or T> C is satisfied by the time stamp comparing unit 41, a read request is issued to the buffer control unit 43 when applying to the second embodiment. When applied to the third or fifth embodiment, a read request is issued to the buffer control unit 43 and the count value of the reproduction counter 42 is reset. At the same time, an instruction is issued to switch the data output to the output switching unit 82 to the data output from the time stamp selection unit 20. In accordance with the instruction, the output switching unit 82
Switch the data to be output.

Next, a seventh embodiment of the present invention will be described. The basic configuration of the data recording / reproducing apparatus according to the seventh embodiment is the same as that of the sixth embodiment shown in FIG. 11, and will be described with reference to FIG. In the seventh embodiment,
When the count value output from the reproduction counter is smaller than the obtained time stamp, the control unit 21 calculates the number of transport stream packets that can be inserted before the count value becomes equal to the time stamp,
It has dummy data insertion means for generating dummy data packets by that number and controlling the output. The recording method is the same as that of the data recording apparatus according to the sixth embodiment, and a description thereof will be omitted.

The reproduction method is as follows.
1st to 5th until the time stamp is obtained
This is the same as the embodiment. Time stamp comparing unit 41
Then, the obtained time stamp (T) and the reproduction counter 4
The count value (C) output from 2 is compared, and if they match or T <C, a read request is issued to the buffer control unit 43 when applied to the second embodiment. When applied to the third or fifth embodiment, a read request is issued to the buffer control unit 43 and the count value of the reproduction counter 42 is reset. If T> C, the difference is used to calculate how many TS packets are to be inserted before outputting the next reproduced data. The number of dummy data packets to be inserted into the switching unit 82 is indicated.

An example of calculation of a dummy data packet to be generated will be described. A clock used by the recording counter 31 and the reproduction counter 42 uses a system clock. Here, it is assumed that the system clock is three times the reproduction bit rate, T = 0x278, and C = 0x44.

When the difference (TC) between the time stamp (T) and the count value (C) output from the reproduction counter 42 is obtained by the time stamp comparing section 41, the value is 0x23.
It turns out that it is 4. This is 56 in decimal
4. If this value is divided by 188, the number of dummy packets on the system clock is calculated, and the value is 564/1.
88 = 3. By dividing this value by the ratio of the reproduction bit rate to the system clock, the number of dummy packets at the reproduction bit rate is obtained. This value becomes 3/3 = 1, which means that dummy data for one packet should be inserted. This operation may be performed each time a time stamp packet arrives.

In accordance with the instruction from dummy data generation section 81, output switching section 82 inputs the designated packet number data from dummy data generation section 81 and outputs the data. When the output switching unit 82 outputs the designated packet number data, a read request is issued to the buffer control unit 43. At the same time, the time stamp comparing unit 41
A trigger signal notifying that the designated number of packets have been output.

In the case where the present invention is applied to the third or fifth embodiment, the time stamp comparing section 41 resets the count value of the reproduction counter in accordance with the trigger signal. At the same time, an instruction is issued to switch the data output to the output switching unit 82 to the data output from the time stamp selection unit 20. According to the instruction, the output switching unit 82
Switches data to be output to the output unit 22.

The display device according to each of the above embodiments can be applied to a television receiver having a digital broadcast receiving function capable of receiving radio waves of digital broadcast as described above. The type, recording method, and the like are not limited, and can be applied to all devices. Further, in each of the above-described embodiments, an example in which a digital broadcast program is recorded as a program has been described.
It may be an audio program such as a current television broadcast program or a radio broadcast program.

In each of the above embodiments, the recording medium may be any device as long as it can record data. In particular, if an HDD that has high data transfer speed and random access performance and allows high-speed access is used as a recording medium, it is possible to instantly search for a desired program from programs recorded for a long time and use it immediately. Become. Further, a recording device other than the HDD such as a magneto-optical disk may be used, and the same effect can be obtained.

In each of the above embodiments, the MPEG2
Has been described as an example in which the desired program data is received from the TS data multiplexed by the transport stream method and recorded. However, the present invention is not limited to this.
The present invention can be applied to all devices that use a PEG stream (for example, devices conforming to the MPEG4 and MPEG7 level standards).

Further, in each of the above-described embodiments, the case where the data recording / reproducing apparatus according to the present invention is applied to a data recording / reproducing apparatus having a data recording function and a data reproducing function has been described as an example. The present invention can be applied to a data recording device having only a function and a data reproducing device having only a data reproducing function. Further, the types, numbers, connection methods, and the like of the respective circuit units constituting the data recording / reproducing device, for example, the receiving unit, the buffer, and the like are not limited to the above-described embodiments.

[0086]

As described above in detail, according to the present invention, an arbitrary stream is extracted from multiplexed data regardless of the bit rate of the stream, and reproduction is performed using a common reproduction stream transmission speed. It can be carried out. Specifically, the following effects can be obtained.

According to the first aspect of the present invention, the data transmission timing at the time of reproduction need only be adjusted to the time of the time stamp packet regardless of the bit rate of the stream, and the transmission timing can be easily controlled. According to the invention described in claim 2, the time stamp packet is inserted immediately before the PCR packet at the time of recording, and at the time of reproduction,
Since the playback data transmission timing is adjusted based on the time stamp value, the PCR can be transmitted at the reception timing regardless of the stream bit rate, and specific data is extracted from the multiplexed data and recorded. Even so, it is possible to obtain an effect that does not hinder reproduction.

According to the third aspect of the present invention, two PCs
Since the difference of R is used as the information of the time stamp packet, the effect that the bit length required for the recording counter 5 and the reproduction counter 13 is smaller than the actual PCR can be obtained. According to the fourth aspect of the present invention, in particular, P
Time stamp packet to PC without specifying ID
It is possible to insert immediately before the R packet.
Can be obtained without having to know the PID.

According to the fifth aspect of the present invention, the time stamp packet is inserted at a fixed time interval regardless of the PCR packet, so that the transmission interval can be controlled even for a stream such as a data broadcast where no PCR exists. . According to the invention of claim 6 or 7, data can be output without interruption during reproduction.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a packet interval restoring method using a PCR value according to the present invention.

FIG. 2 is an explanatory diagram of a packet interval restoring method when a system clock is used according to the present invention.

FIG. 3 is a block diagram illustrating a configuration of a data recording / reproducing device according to the first embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a packet generation unit of the data recording / reproducing device of the present embodiment.

FIG. 5 is a block diagram showing a configuration of a control unit of the data recording / reproducing device of the present embodiment.

FIG. 6 is a diagram showing a configuration of a time stamp packet of the data recording / reproducing apparatus of the present embodiment.

FIG. 7 is an explanatory diagram showing received data, recorded data, and output data of a data recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 8 is a block diagram illustrating a configuration of a packet generation unit of a data recording / reproducing device according to a third embodiment of the present invention.

FIG. 9 is a diagram showing a structure of a PCR of the data recording / reproducing device of the present embodiment.

FIG. 10 is a block diagram illustrating a configuration of a packet generator of a data recording / reproducing device according to a fifth embodiment of the present invention.

FIG. 11 is a block diagram illustrating a configuration of a data recording / reproducing apparatus according to a sixth embodiment of the present invention.

FIG. 12 shows a transport stream (T
It is a figure which shows the structure of S).

FIG. 13 is an explanatory diagram showing received data, recorded data, and transmitted data when the bit rates at the time of reception and the time of transmission of the conventional data recording / reproducing apparatus are matched.

FIG. 14 is an explanatory diagram showing reception data, recording data, and transmission data when the bit rate at the time of reception and the bit rate at the time of transmission of the conventional data recording / reproducing apparatus are changed.

[Explanation of symbols]

10, 80 data recording / reproducing device 11 receiving unit (receiving unit) 12 synchronization detecting unit (synchronizing detecting unit) 13 packet selecting unit (packet extracting unit) 14 recording buffer 15, 30, 50, 70 packet generating unit (packet generating unit) 16 packet insertion unit (packet insertion unit) 17 recording / reproduction control unit (recording / reproduction control unit) 18 recording medium 19 reproduction buffer 20 time stamp packet selection unit (time stamp packet extraction unit) 21, 40 control unit (control unit) 22 output (Output means) 30. Reference Signs List 31 recording counter 32 time stamp packet generation unit 41 time stamp comparison unit 42 reproduction counter 43 buffer control unit 51 PCR acquisition unit (PCR acquisition unit) 52 previous PCR holding unit (pre-PCR holding unit) 53 PCR difference calculation unit (PCR difference calculation) Means) 61 PCR_base area 62 PCR_extention area 63 Stuffing area 71 Count value setting section 81 Dummy data generation section 82 Output switching section 83 Dummy data insertion section (dummy data insertion section) 100 Time stamp packet

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsuyoshi Hashimoto 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Reito Mori 22-22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka (72) Inventor Shinichiro Shirai 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Tsuyoshi Hayama 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka F term (reference) 5C053 GA13 GB10 GB37 HA04 HA33 JA22 JA26 KA01 LA15 5C059 MA00 RB02 RB08 RC04 SS11 UA08 UA34 UA38 5D044 DE38 EF05 FG19 GK12

Claims (7)

[Claims] 1. A receiving means for receiving desired program data from a plurality of program data; a synchronization detecting means for detecting synchronization of a transport stream in the received MPEG; and identifying and specifying a packet ID of the transport stream. A packet extraction unit for extracting a packet of the packet; a recording buffer for storing a packet identified by the packet extraction unit; a packet generation unit for generating a time stamp packet using information on the arrival time of the specific packet; Packet insertion means for inserting the time stamp packet generated by the generation means into the transport stream; recording medium for recording the transport stream after insertion of the time stamp packet; recording for controlling recording and reproduction of the recording medium Re-control means and playback A time stamp packet extracting means for identifying the time stamp packet from the output data of the playback buffer; and obtaining a time stamp from the time stamp packet extracted by the time stamp extracting means. A data recording / reproducing apparatus comprising: control means for controlling reading of data from the reproduction buffer based on time information of a time stamp; and output means for outputting data read from the reproduction buffer. 2. The method according to claim 1, wherein the specific packet extracted by the packet extraction unit is a PCR (Program Clock Reference) packet, and the packet generation unit triggers a PCR identification signal output when the PCR packet is identified. Has a reproduction counter that counts the time stamp, generates a packet using the count value from the reproduction counter as information, the control unit acquires a time stamp from the time stamp extraction unit, 2. The data recording / reproducing apparatus according to claim 1, wherein the transmission timing of the PCR is controlled by comparing with a count value. 3. The specific packet extracted by the packet extraction unit is a PCR packet, and the packet generation unit includes a PCR acquisition unit that acquires a PCR when the PCR packet is extracted by the packet extraction unit. A pre-PCR holding unit that holds a PCR packet that has arrived immediately before the PCR packet; and a difference between a PCR value obtained by the PCR obtaining unit and a PCR value held by the pre-PCR holding unit. A PCR difference calculating means for calculating, a packet using the difference calculated by the PCR difference calculating means as time information is generated, the control means acquires a time stamp from the time stamp extracting means, and The transmission timing of the PCR is controlled by comparing with a count value of a counter. Data recording and reproducing apparatus according to Motomeko 1 or 2. 4. The data recording apparatus according to claim 1, wherein when the packet is extracted by the packet extracting unit, a PCR packet is identified by an adaptation field control flag and a PCR flag of the packet. Playback device. 5. The packet generating means generates a time stamp packet after a lapse of a predetermined time irrespective of the arrival time of the specific packet, and the control means obtains a time stamp from the time stamp extracting means. 2. The data recording / reproducing apparatus according to claim 1, wherein the data transmission timing is controlled by comparing the data transmission timing with a count value of a reproduction counter. 6. The packet generation means has a reproduction counter for counting a time stamp triggered by a PCR identification signal output when a PCR packet is identified, and uses the count value from the reproduction counter as information. Generating a packet, and further comprising a dummy data insertion unit for outputting dummy data until the count value becomes equal to the time stamp when the count value output from the reproduction counter is smaller than the obtained time stamp. The data recording / reproducing device according to claim 1. 7. When the count value output from the reproduction counter is smaller than the acquired time stamp, the dummy data insertion unit may determine the number of transport stream packets that can be inserted until the count value becomes equal to the time stamp. 7. The data recording / reproducing apparatus according to claim 6, wherein the number of dummy data packets is calculated and output.