WO2006059804A1

WO2006059804A1 - Data recording/reproduction/transmission method, device, and recording medium

Info

Publication number: WO2006059804A1
Application number: PCT/JP2005/022597
Authority: WO
Inventors: Satoshi Itoi
Original assignee: Nec Corporation
Priority date: 2004-12-03
Filing date: 2005-12-02
Publication date: 2006-06-08

Abstract

Reproduction buffer read-out data (701) is inputted and packet data is outputted from a packetization output (703) via a packetization block (702). Simultaneously with this, the packet data is inputted to a PCR detection (704) and a reproduction PCR is detected. A recorder or a player artificially generates a PCR by an artificial PCR generation (706) from a built-in clock (705) so as to be used as an inner PCR. The reproduction PCR and the inner PCR are compared to each other by a PCR comparison (707). According to the result, a read-out signal of the reproduction buffer is sent from a buffer input (709) via an output request (708) to the reproduction buffer.

Description

DATA RECORDING / REPRODUCING TRANSMISSION METHOD, DEVICE, AND RECORDING MEDIUM TECHNICAL FIELD

The present invention relates to a hard disk D V D combo video stream recorder, a D V D video recorder, a D V D stream recorder, and a hard disk video stream.

Of video, audio, and data on recording devices such as video recorders, at least

The present invention also relates to a method, an apparatus, and a recording medium for recording and reproducing one. Background art

Conventionally, video and stream related application formats on DVD (Digital Versatile Disc) are DVD-Video for playback only on DVD-Forum, DVD-VR (Video Recording) for easy recording, playback and editing, and broadcasting. Alternatively, the DVD-SR (Stream Recording) format that facilitates direct recording and playback of transmission streams has been standardized.

DVD-Video is a disc playback format that contains pre-recorded content such as movies, and is mainly targeted at home theaters. DVD-VR is a format whose main purpose is to digitize analog video and record it with MPEG-2 encoding. Its main targets are analog broadcast recording and video camera recording. DVD-SR is a format that basically records the data sent as an MPEG stream as it is, and its main target is direct recording of digital broadcasting. Currently, DVD-Video is widely available around the world, and DVD-VR is also becoming very popular, but DVD-SR has not been commercialized.

Here, when recording an analog broadcast by DVD-VR, normally only one channel was recorded. For example, NTV (4-channel) recording only, or TBS

(6 channels) only recording. DVD-Video is a playback-only format, but it can also be applied to recording. When recording analog broadcasts with DVD-Video, usually only one channel was recorded. For this reason, a multi-channel recording apparatus and a recording method for efficiently recording a plurality of programs simultaneously on a disk-shaped recording medium are disclosed in Japanese Patent Laid-Open No.

1).

On the other hand, when a stream such as a digital broadcast is recorded as it is, the arrival time of the digital broadcast is recorded at a fixed number of bits at the same time. Here, the fixed number of bits is usually a TS (Transport Stream) of 188 bytes, and the input time or arrival time of digital broadcast data is a 4-byte PATS (Packet Arrival Time Stamp). In digital broadcasting, TS composed of multiple programs in one stream is arranged as follows, for example.

搴 Ach TS (PATS: 0), Ach TS (PATS: 1), Bch TS (PATS: 2), Ach TS (PATS: 3), Bch TS (PATS: 4), Bch TS ( PATS: 5), Ach TS (PATS: 6), ········ PATS indicates the input time or arrival time of digital broadcast data. PATS

When recording only Ach TS, it was necessary to synchronize during playback.

In the example of recording only the Ach TS mentioned above,

Ach TS (Time I) 0), Ach TS (Time 1), Ach TS (Time! J 3), Ach TS (Time 6),

It was recorded as follows. Disclosure of the invention

Problems to be solved by the invention

In response to a request to simultaneously record video, audio, data, etc. across multiple channels on a DVD, when a digital broadcast is recorded directly on a DVD-SR, a single broadcast wave is generated in the digital broadcast. As a format, multiple streams of digital broadcast data can be recorded simultaneously.

However, if multiple channels are recorded simultaneously by the recording method as described above, there are the following problems.

In other words, when recording an analog broadcast with DVD-VR or DVD-Video, it is possible to record more than 2 channels of video audio simultaneously. And TBS are recorded at the same time, a stream with NTV encoded is recorded in area A for 1 second, and then a stream encoded with TBS is recorded in area B for 1 second. Will repeat. In such a recording method, when a seek frequently occurs and a medium error rate partially deteriorates, a recording error may occur. Recording errors, unlike playback errors, are difficult to retry, and if you try to re-record forcibly, more delay will accumulate and the recording may fail. In addition, the difficulty of realization increases as the number of channels increases, such as 3-channel recording and 4-channel recording.

On the other hand, it is necessary to consider the possibility of broadcasting a program with correlation on multiple channels. For example, a program that broadcasts one soccer broadcast, one broadcast station (for example, NTV) from the front stand, and another broadcast station (for example, TBS) from the back of the goal net, can be recorded simultaneously. In this case, it is necessary to synchronize and switch both channels (in this case, NTV and TBS) at the time of playback, but such high-speed synchronization and switching are very difficult.

In addition, it is possible to record multi-stream digital broadcasts directly with DVD-SR. In that case, since the contents of the recorded stream are not known after recording, it is necessary to read the stream and analyze its contents. The user cannot know the recording position, recording time, and correlation of the video / audio data of each channel in the multi-stream.

In the above-mentioned Patent Document 1, a plurality of channel programs can be recorded by controlling each digital data constituting two different programs on a disc-shaped recording medium alternately in a specified data length unit. It is disclosed. However, even with the recording method disclosed in Patent Document 1, it is difficult to solve the problem of occurrence of a recording error as in the above-described methods.

Recently, however, the number of PC-based video stream recorders has also increased. Of these, there are two types for digital broadcasting. In the first type, digital broadcasting is demodulated by an external STB (Set-top Box), converted to TS, input to the PC, recorded, played back, and MPEG decoded by the PC. In the second type, digital broadcasting is directly input to the PC, demodulated, converted to TS, recorded, played back, MPEG decoding.

Both types required PATS records. However, it is difficult to generate and record an accurate PATS because the PC does not have the 27 MHz cucumber normally required to generate a PATS. In addition, it is difficult to generate and record the recording position on the medium of TS data corresponding to PATS as a time table.

It is also possible to generate a PTS (Presentation Time Stamp) -based time map. In this way, when using a PTS-based time map, TS is used to detect the PTS during playback. The contents of the stream must be analyzed, and there are problems such as the complexity of the system and the difficulty of handling multiple channels.

An object of the present invention is to provide a data recording / reproducing transmission method that can easily realize simultaneous recording of a plurality of channels by a simple recording method and a PC-based video stream recorder.

Another object of the present invention is to provide a recording medium that can be used in the above-described data recording, reproduction, and / or transmission method.

Means for solving the problem

According to one aspect of the present invention, data is recorded that records a transport stream (TS) and does not record a time map indicating a relationship between a time and a recording position based on a PTS that is a TS display time. A recording method is obtained.

Alternatively, a data recording method can be obtained in which the transport stream (TS) is recorded and the PATS that is the arrival time of the TS is not recorded.

Alternatively, a data recording method can be obtained, in which a transport stream (TS) is recorded and a time table indicating a relationship between a recording position and a time based on PATS that is the arrival time of the TS is not recorded.

According to another aspect of the present invention, the reproduction reference skew read from the reproduced TS stream is compared with the internal reference clock generated by the apparatus in the apparatus, and the reproduction is performed based on the result. A data reproduction method characterized by controlling the timing of reading data from the buffer and / or the amount of data can be obtained.

Or a playback reference clock read from the played TS stream, and It is possible to compare the internal reference clocks in which the clocks in the device are generated, and to control the timing of writing data to the decoder buffer and the amount or amount of data based on the result.

Or, when the difference between the value of the reproduction reference clock and the value of the internal reference clock reaches a certain value, reading from the reproduction buffer and writing to the buffer or decoder buffer are stopped, and reproduction is performed when the difference reaches another certain value. There is obtained a data reproduction method characterized by starting reading from a buffer and / or writing to a decoder buffer.

Alternatively, it is characterized in that data having a regenerative reference clock that roughly matches the internal reference clock is read from the regenerative buffer and written to the decoder buffer.

Alternatively, the data between the reproduction reference clocks is read from the reproduction buffer and / or written to the decoder buffer in the internal reference clock period that is substantially the same as the data.

Or, compare the value of the playback reference clock with the value of the timer generated from the internal clock, and start reading from the playback buffer and / or writing to the decoder buffer according to the result, and detect the playback reference clock. Reading from the playback buffer and writing to the memory buffer or decoder buffer are stopped.

Or, start reading from the playback buffer and / or writing to the decoder buffer when the timer value generated from the internal clock is greater than or equal to the value of the playback reference clock, plus the offset. It is characterized by.

Alternatively, writing to the playback buffer is stopped when the amount of data stored in the playback buffer reaches a certain value, and writing to the playback buffer is started when it reaches another constant value.

Alternatively, writing to the playback buffer is stopped when the amount of data stored in the playback buffer reaches a certain value, and writing to the playback buffer is started when it reaches another constant value. Or the buffer capacity of the playback buffer and the decoder buffer

It is characterized in that it is set to the same value as when playing data recorded with PATS.

Alternatively, in the above, the reproduction speed of the recording medium is sufficiently high.

Alternatively, the buffer capacity of the reproduction buffer and / or the decoder buffer is set to a capacity capable of storing at least the number of data bits transmitted in the time interval of the reference clock.

Or, if the PATS appearance time interval is a second and the reference clock appearance time interval is b seconds, the buffer capacity of the playback buffer and the decoder buffer is approximately b Z compared to when the PATS is recorded. It is characterized by a. Or, the buffer capacity of the playback buffer is at least the value obtained by subtracting the average playback buffer read unit from the playback buffer write unit, and the average playback buffer read unit is the TS rate multiplied by the playback buffer write unit time. The buffer write unit time is a value obtained by dividing the playback buffer write unit by the playback buffer write rate.

Or, the buffer capacity of the decoder buffer should be at least the value specified by the decoder model and the decoder buffer write unit plus the decoder buffer write unit, TS rate, and (reproduction reference clock period + internal clock timer (Period)).

Or, the reference clock is PCR, and / or 0PCR, and Z or PTS, and D or DTS, or other time information.

Alternatively, the data read from the playback buffer is transmitted from the digital interface after adding all or part of the header and overhead.

Alternatively, a stream transmitted by the digital interface is received and played back by a decoder having a decoder buffer defined by any of the methods described above.

Or, receive the stream transmitted by the digital interface, It is characterized in that it is replayed by a decoder having an arbitrary decoder buffer, and a retransmission is requested to the device transmitting to the digital transmission device when the amount of data stored in the decoder buffer exceeds a certain value.

Alternatively, the reproduction buffer is a buffer for writing data reproduced from the recording medium and reading the data to be sent to the decoder, and the buffer in the decoder is a decoder buffer.

According to still another aspect of the present invention, a data recording / reproducing transmission apparatus for realizing the above-described data recording / reproducing transmission is obtained.

According to another aspect of the present invention, a recording medium recorded by the data recording method, that is, a recording medium is obtained.

The invention's effect

The present invention does not record the time map that is the relationship between the time and recording position based on the PTS, the PATS itself, and the time table that is the relationship between the time and recording position based on the PATS. It simplifies the recording process and easily records multiple streams simultaneously.

A PC-based video stream recorder can also be realized. According to the present invention, simultaneous recording can be performed without frequent seeks. Therefore, the occurrence of recording errors can be reduced, and special hardware such as a 27 MHz clock is not required. There is an effect that a PC-based video stream recorder can be easily realized by software alone. Brief Description of Drawings

FIG. 1 is a functional block diagram for realizing the present invention. Here, the recording system is mainly shown.

FIG. 2 is a functional block diagram for realizing the present invention. Here, a reproduction system is shown.

FIG. 3 is a functional block diagram for realizing the present invention, showing video and audio playback.

FIG. 4 is a functional block diagram for realizing the present invention, and shows a TS decoder. FIG. 5 is a timing chart for realizing the present invention, showing video and audio reproduction.

FIG. 6 is another example of a functional block diagram for realizing the present invention, and is a diagram showing video and audio reproduction.

FIG. 7 is another example of a functional block diagram for realizing the present invention, and is a diagram showing bucket playback.

FIG. 8 is another example of a functional block diagram for realizing the present invention, and shows a TS decoder.

FIG. 9 is another example of a functional block diagram for realizing the present invention, and shows a TS decoder for received digital data.

FIG. 10 is another example of a timing chart for realizing the present invention, and is a diagram showing video and audio reproduction.

FIG. 11 is still another example of a timing chart for realizing the present invention, and shows video and audio reproduction.

FIG. 12 is still another example of a timing chart for realizing the present invention, and is a diagram showing video and audio reproduction.

FIG. 13 is a diagram showing an example of the transition of the data storage amount of the decoder buffer that implements the present invention.

FIG. 14 is a diagram showing another example of the transition of the data storage amount of the decoder buffer that implements the present invention.

FIG. 15 is a diagram showing still another example of the transition of the data accumulation amount of the decoder buffer that implements the present invention.

FIG. 16 shows another example of a timing chart for realizing the present invention. In this example, read data is continuously read.

FIG. 17 is another example of a functional block diagram for realizing the present invention, showing a bucket playback.

FIG. 18 shows another example of a timing chart for realizing the present invention. In this example, read data is continuously read. BEST MODE FOR CARRYING OUT THE INVENTION

A data recording / reproducing transmission method according to an embodiment of the present invention will be described with reference to FIGS.

Referring to FIG. 1, there is shown a schematic configuration of a data recording / reproducing apparatus for realizing multichannel video audio recording according to the present invention. In the illustrated example, the parts other than the parts constituted by hardware are shown as functional blocks mainly executed by software, but these parts may be realized by hardware.

Fig. 1 shows an example of recording multi-channel video audio data on an HDD or a DVD video recorder. Here, Fig. 1 shows an example of multi-channel recording. A digital broadcast RF signal 101 and a control signal 102 are input to the illustrated apparatus. The control signal 102 is user operation data that designates a channel number to be multiplexed and a multiplexing method, and is generated according to a user operation.

Upon receiving the input signal 101, the tuner 103 outputs a full TS for each channel and performs TS selection 104. TS selection 104 selects the necessary partial TS of each full TS.

Each partial TS selected by TS selection 104 is input to integration 105. In the integration 105, a plurality of partial TSs given by the TS selection 104 are multiplexed and integrated using a plurality of PMTs (P rogram maps Tab 1 e). The designation is made according to 109.

The data integrated by the integration 105 is converted into a format corresponding to the HDD or DVD by the recording formatting 106. Formatting is performed according to the physical format, file format, and video application format of each HDD and DVD.

The feature of the present invention is that it does not have a time map based on PTS (Presentation Time Stamp), does not have PATS, or does not have a time table based on PATS. In addition, formatization is performed. The video / audio data formatted by the recording format 106 is recorded on the HDD 107 or the DVD 108 as a file designated by 109. .

At the same time, the control signal 102 specifies the recording format and the recording file in the recording format conversion 106 by the recording file determination and management data generation 109, and generates the channel, method and data management data to be multiplexed and integrated. Record to HDD 107 and DVD 108.

The data recorded on the HDD 107 and the DVD 108 is dubbed between the two and reproduced from 110. As shown in the figure, the HDD may be played as playback 1 and the DVD as playback 2. As shown in the figure, though it is not shown, it may be played as one system after passing through the selector for selecting playback 1 and playback 2.

FIG. 2 is a block diagram for displaying and outputting reproduced data after multi-channel recording. Here, it is assumed that 110 shown in FIG. At the same time, a control signal 202 is given. The control signal 202 is user operation data for designating a channel to be selected and displayed from among the multiplexed reproduction data, a display position, and the like.

The playback signal 201 is input to the HDD / DVD playback block 203.

In the HDD / DVD playback block 203, physical layer playback processing called front-end processing is performed, and the played back 203 output is input to a video / audio playback block 204.

In the video / audio playback block 204, the TS bucket is decoded, and then MP EG decoding is performed. The compression method may be other than MP EG. When the compression stream is other than MP EG, decoding is performed in the compressed method. Details regarding the video and audio playback block 204 will be described separately.

The output of the video / audio playback block 204 is designated by the control signal 202, the channel to be selected and displayed from the recorded multi-channel video audio data, the display position, etc. Display output to the monitor and audio output to the speaker are output. The output signal may be subjected to processing such as noise reducer and filter. The control signal 202 is input to the management data decoding / playback file determination block 205. In the playback file determination block 205, the management data is interpreted from the playback data, the file to be played back is determined, playback controlled, and the playback video reconstruction method is determined. Once determined, the HDD, DVD playback block 203, video and audio playback block 204 are controlled.

Hereinafter, an example of the operation in the video / audio playback block 204 will be described with reference to FIGS. Here, in order to facilitate understanding of the present invention, first, a case where data recorded with PATS (Packe ArriValTiMeStamp) is reproduced will be described.

Referring to FIG. 3, an HDD with PATS and DVD playback signal 301 are input to the illustrated video and audio playback block 204, and this signal 301 corresponds to 203 output in FIG. The reproduction signal 301 is written to the reproduction buffer 302 in a constant data unit. When writing to the playback buffer 302, the PATS detection block 304 detects PATS at the same time. The PATS detection block 304 is described here as using a 27 MHz clock 303, but this clock may not be used. The data written in the playback buffer 302 is read from the playback buffer 302 according to the timing of the PATS detected by the PATS detection block 304 and is input to the bucketizer 305. The debucketizer 305 reconstructs the TS bucket according to the PATS and performs processing such as filling the space where the PATS does not exist with stuffing. The first output of the debucketizer 305 is output from the interface output 307 as a digital interface with a header, overhead, etc. added by the interface 306. Also, the second output of the bucketizer 305 is MPEG-TS decoded by the TS decoder 308, and a video signal is output from the display audio output 309 to the monitor or an audio signal is output to the speaker. On the other hand, in order to prevent overflow or underflow of the playback buffer 302, the buffer monitor 310 monitors the amount of 302 data, and when it falls below a certain value, the HDD or DVD is played back via the write control 31 1. Control is performed so that the specified reproduction data is written in the reproduction buffer 302 as the reproduction signal 301. With reference to FIG. 4, a specific configuration and operation of the TS decoder 3 08 shown in FIG. 3 will be described. The debucketizer output 4 0 1 corresponds to the output of the debucketizer 3 0 5 shown in FIG. 3, and is input to the decoder buffer 4 0 2. When certain data is written to the decoder buffer 4 0 2, reading by the MPEG decoder 4 3 starts. The MPEG decoder 4 03 performs MPEG decoding on the data read from the decoder buffer 4 0 2, and displays the same display as in FIG. 3, and the audio output 3 0 9 consists of a video signal to the monitor or an audio signal to the speaker. Display audio output 4 0 4 is output. FIG. 5 shows a timing chart of the blocks shown in FIGS. 3 and 4, and the operation of FIGS. 3 and 4 will be described with reference to FIG. First, 5 0 2 is the timing of HDD and DVD playback signal 3 0 1, while 5 0 1 is the PATS in which playback signal 3 0 1 is detected by PATS detection block 3 0 4, that is, 5 0 2 Indicates PATS. In Fig. 5, playback is played continuously every 5 TS packets, and PATS is also input simultaneously with playback.

5 0 4 is the output of the playback buffer 3 0 2, and 5 0 3 is the PATS for 5 0 4. Timing has been reconfigured according to the detected PATS. In Fig. 5, there is no data in the part indicated by the horizontal line, and it is filled with stuffing, for example, and output.

5 0 6 is the output of the debucketizer 3 0 5, and 5 0 5 is the PATS for 5 0 6. Timing has been reconfigured according to the detected PATS.

5 0 8 is the output of the TS decoder 3 0 8, and 5 0 7 indicates the time corresponding to the PATS of 3 0 8. The decoded output is continuous video audio data.

In FIG. 5, the timings “0” of 5 0 2, 5 0 4, 5 0 6 and 5 0 8 are shown to occur at the same time. It becomes. For ease of illustration, they are only shown as occurring simultaneously.

Referring to FIG. 6, an example of the video / audio playback block 2 0 4 shown in FIG. 2 is shown. Here, a video / audio playback block capable of playing back data not recorded by the PATS, which is a feature of the present invention, is shown. Has been. Here, the video and audio playback block 204 shown in FIG. 6 may be used together with or independently of the block described with reference to FIGS. Referring to FIG. 6, an HDD and DVD playback signal 601 without PATS are input, and the playback signal 601 corresponds to the output of the playback block 203 in FIG. The HD D / DVD playback signal 601 is written to the playback buffer 602 in a fixed data unit. When writing to the playback buffer 602, PATS is not recorded in the HDD or DVD playback signal 601 and cannot be detected. The data written in the reproduction buffer 602 is read from the reproduction buffer 602 and input to the packet reproduction block 603 according to the timing generated by the bucket reproduction block 603 under the control of the bucket reproduction block 603. The packet recovery block 603 reconstructs the TS bucket according to the timing generated internally, and performs processing such as filling the space where no data exists with stuffing. The bucket playback block 603 will be described in more detail later. The first output of the packet reproduction block 603 is output from the interface output 605 to the digital interface with the header, overhead, etc. added by the interface 604. Also, the second output of the packet reproduction block 603 is MPEG-TS decoded by the TS decoder 606, and an image signal is output from the display audio output 607 to the monitor or an audio signal to the speaker. On the other hand, in order to prevent overflow or underflow of the playback buffer 602, the buffer monitor 608 monitors the amount of data in the playback buffer 602, and when it falls below a certain value, the HDD or DVD is played back via the write control 609. The specified playback data is controlled to be written in the playback buffer 602 as the playback signal 601. When the specified playback data exceeds a certain value, playback of the HDD or DVD is stopped via the write control 609, and the playback buffer 602 Stop writing.

The buffer capacity of the playback buffer 602 is such that the buffer monitor 608 controls to prevent overflow or underflow when the HDD or DVD playback speed is sufficiently high compared to the TS decode speed. That is, the same capacity as the reproduction buffer 302 shown in FIG. If the HDD and DVD playback speed is not sufficiently high compared to the TS decoding speed, a capacity capable of recording all data in the PCR (Procedure Clock Reference) interval is required. For example, when the broadcast bit rate is 10Mbps and the PCR interval is 100msec, 1Mbit or more Capacity is required.

Or the additional capacity more than the above is required for the capacity when PATS is recorded. For example, if the capacity when PATS is recorded is 1Mbit, the data bit rate is 10Mbps, and the PCR interval is 100msec, a capacity of 2Mbit or more is required. With reference to FIG. 7, the bucket playback block 60 3 shown in FIG. 6 will be described in detail. First, the packet reproduction block 60 3 shown in FIG. 7 can manage the timing of reproducing the TS packet without PATS, and the block 6 0 3 includes the reproduction buffer read data 当該 0 1 Enter. The reproduction buffer read data Ί 0 1 is supplied to the depacket block 7 0 2 and simultaneously to the PCR detection block 7 0 4. The PCR detection block 70 4 detects PCR (Program Clock Reference) from MPEG-TS. Here, PCR will be explained. PCR is data defined by MPEG system formats, and is 42-bit data that counts up a 27 MHz clock synchronized with the video signal at the time of recording. PCR is always recorded at least once every 100 msec in digital broadcasting. The PCR detected in the PCR detection block 70 4 is input to the PCR comparison block 70 7 as a regenerative PCR.

On the other hand, the recorder or player generates a built-in clock 7 0 5, and this clock 7 0 5 is given to the pseudo PCR generation block 7 0 6. Pseudo PCR generation block 700 generates pseudo-PCR that is 42-bit data that counts up the 27MHz clock from the clock and uses it as internal PCR. Clock 7 0 5 may use 27MHz or other frequency. When using a clock with a frequency other than 27 MHz, the frequency must be set so as not to cause an error with the count value of the 27 MHz clock as much as possible.

The reproduction PCR detected from the reproduction data and the internal PCR generated in the recorder or player are input to the PCR comparison block 70 7 for comparison. Here, if the regenerative PCR and the internal PCR are consistent, they are synchronized, and neither the playback buffer nor the decoder buffer overflows or underflows.

However, there is usually a deviation, ie, a deviation, between the regenerative PCR and the internal PCR. The HDD or DVD drive must be capable of playing back at a bit rate that exceeds at least the bit rate for MPEG decoding. PCR counts up faster than internal PCR.

Therefore, the regenerative PCR is constantly compared with the internal PCR, and when the regenerative PCR advances by a certain value or more relative to the internal PCR, reading of the regenerative buffer 60 2 is stopped, and when the regenerative PCR is below the certain value, reading of the regenerative buffer 60 2 is started. Control to do.

For example, when displaying PCR for seconds for explanation,

• When the progress of the regenerative PCR with respect to the internal PCR is 2 seconds or more, the data to be decoded, that is, the data accumulated in the decoder buffer (eg, 80 2 in Fig. 8) is sufficient. Stop reading the playback buffer 6 0 2

譬 When the advance value of the internal PCR of the playback PCR is less than 1 second, the playback buffer 6 0 2 assumes that the data to be decoded, that is, the data accumulated in the decoder buffer 8 0 2 at the subsequent stage is insufficient. Start reading

• As described above, as the drive operation, when the amount of data stored in the playback buffer 60 2 falls below a certain value, the drive starts playback, and the amount of data stored in the playback buffer exceeds another certain value. The drive will stop playing.

By doing so, it becomes possible to keep a stable buffer amount in the reproduction buffer 6 0 2 and the decoder buffer 8 0 2.

The read signal of the reproduction buffer 6 0 2 is sent to the reproduction buffer 6 0 2 as the buffer input 7 0 9 through the output request 70 8.

The buffer input 7 0 1 read at the normal timing is debucketed by the depacket block 7 0 2, and the bucket replay data is output from the bucket replay output 7 0 3.

In this embodiment, PCR is shown, but the same processing is possible with OPCR (Original Program Clock Reference; and PTS (Presentation Time Stamp) ^ DTS (Decoding rime Stamp) and other time information.

With reference to FIG. 8, the TS decoder 6 06 shown in FIG. 6 will be specifically described. The bucket playback output 70 03 of the bucket playback block 60 3 shown in FIG. 7 is given to the decoder buffer 8 02 as the bucket playback output 8 0 1. When certain data is written to the decoder buffer 8 02, reading by the MPEG decoder 8 3 starts. In MPEG decoder 8 0 3, read from decoder buffer 8 0 2 MPEG decoding is performed on the data, and the display audio output 8 04 consisting of the video signal to the monitor or the audio signal to the speaker is output as the display audio output 6 07 shown in FIG.

As described with reference to FIGS. 6 to 8, in the present invention, the reproduction buffer 6 0 2 and the decoder buffer 8 0 2 are controlled by the reference clock information without recording the time stamp information for each packet. This control enables stable recording and playback without a time stamp or time map. In other words, the recording / reproducing method according to the present invention makes it unnecessary to calculate PTS, time map, etc., when recording multiple channels simultaneously by performing control without recording PATS, time map, and time table. There is an advantage to say. This control method can be applied to data transmission as well.

With reference to FIG. 9, the configuration of the TS decoder used on the receiving side when the interface output 6 05 shown in FIG. 6 is transmitted as digital data will be described. 9, the interface output 6 0 5 of FIG. 6 is received by the TS decoder as the interface input 9 0 1, and the TS decoder MPEG decodes the interface input 9 0 1. The interface input 9 0 1 is input to the decoder buffer 9 0 2, and when certain data is written to the decoder buffer 9 0 2, reading by the MPEG decoder 9 0 3 starts. The MPEG decoder 90 3 performs MPEG decoding on the data read from the decoder buffer 90 2 and outputs a video signal from the display audio output 90 4 to the monitor or an audio signal to the speaker. The display audio output 9 0 4 corresponds to 6 0 7 shown in FIG.

Figure 10 shows the timing chart of the blocks shown in Figure 6, Figure 7, and Figure 8.

1 0 0 2 indicates the timing of the HD and D V D playback signals 6 0 1. 1 0 0 1 indicates a PATS when a PATS is recorded. In the illustrated embodiment, since PATS is not actually recorded, P A T S 1 0 0 1 cannot be used for synchronization in playback.

1 0 0 4 indicates the read timing and read data of the playback buffer 6 0 2 when two streams share one stream. 1 stream to 2 broadcast stations Is shared, the power to read the playback buffer 602 for each ITS is still accumulated.

Reference numeral 1003 indicates time-based information on the reproduction PCR detected by the PCR detection block 704 as the PCR of the data read from the reproduction buffer 602.

Reference numeral 1005 indicates the internal PCR generated by the pseudo PCR generation 706 from the clock 705 as time information.

Comparing the illustrated reproduction PC R 1003 and the internal PCR 1005, the reproduction PC R 1003 has a slightly higher frequency. In the figure, at time "0", the regenerated PCR 1003 and the internal PCR 1005 start simultaneously, and the regenerated PCR 1003's regenerated PCR time 14 and the internal PCR 1005's internal PCR time 12 are simultaneously timed. .

here,

• Stops reading the playback buffer when the playback PCR time has advanced by 2 or more relative to the internal PCR time

再生 When the playback PCR time is more than "2" behind the internal PCR time, reading of the playback buffer is started.

When the playback PCR time 14 of the regenerative PCR 1003 and the internal PCR time 12 of the internal PCR 1005 overlap, reading of the regenerative buffer 602 is stopped. Playback buffer reading starts when playback PCRB Teraki 14 and internal PCR time 16 of internal PCR 1 005 overlap.

Further, referring to FIG. 10, reference numeral 1007 denotes an output of the bucket reproduction 603, and reference numeral 1006 denotes reproduction PCR of the bucket reproduction output data as time information.

1009 is the output of the TS decoder 606, and 1008 indicates the PCR time information of 606. The decoded output is continuous video audio data.

Here, in FIG. 10, it is shown that the timings “0” of 1002, 1004, 1006, and 1008 are generated at the same time. For ease of illustration, they are only shown as occurring simultaneously. In this embodiment, the force described in the case of generating time information using PCR is the same for OPCR (Original Program Clock Reference), PTS (Presentation Time Stamp), DTS (Decoding Time Stamp), and other time information. Processing is possible.

In FIG. 10, if 2 broadcast stations share 1 stream in 1 0 4, it is assumed that the playback buffer 6 0 2 is read for each ITS. If it is unknown how the data is shared, data will be read continuously from the playback buffer 6 0 2.

An example of a continuous data read timing chart is shown in Fig. 11.

1 1 0 1, 1 1 0 2, 1 1 0 5 in FIG. 11 are equal to the temporary P AT S 1 0 0 1, the reproduction timing 1 0 0 2, and the internal P C R 1 0 0 5 in FIG. In 1 1 0 4, continuous 8 T S data is read out. Reference numeral 1 1 0 3 indicates, as time information, the reproduction PCR in which the PCR of the data read from the reproduction buffer is detected in 70 4.

Playback When playback PCR 1 1 0 3 playback PCR time 1 4 and internal PCR 1 1 0 5 internal PCR time 1 2 overlap, playback buffer 6 0 2 stops reading and playback PCR 1 1 0 3 The operation of starting the reading of the reproduction buffer 60 2 when the reproduction PCR time 14 overlaps the internal PCR time 16 of the internal PCR 110 is the same as in FIG. 1 1 0 7 is an output of the packet reproduction block 6 0 3.

1 1 0 6 shows the reproduction PCR of the bucket reproduction output data as time information.

1 1 0 9 is the output of the TS decoder 6 06, and 1 0 0 8 is the PCR time information of 6 06. The decoded output is continuous video audio data.

Here is a more specific example of a block that actually compares PCR.

An example PCR comparison timing chart is shown in Figure 12.

1 2 0 1 indicates 100 msec based on internal PCR, and 1 2 0 3 indicates a regenerated TS. Further, 1 2 0 2 shows the regenerated PCR detected from the regenerated TS as time information, and 1 2 0 4 shows the internal PCR as time information.

The playback TS PCR is assumed to be recorded once every 100 msec, and the PCR is 100 msec. 12 counts shall be advanced. Therefore, the actual PCR is recorded only in TS0, TS12, TS24, ···, and not in other TS. However, 1 2 0 2 shows all PCR information for explanation.

In TS0, regenerative PCR 1 2 0 2 and internal PCR 1 2 0 4 match, and TS of TS0 to TS10 is read within 100 m from internal PCR 1 2 0 4 as a reference. Then, after reading TS10, stop reading. Alternatively, if it is not known whether PCR is recorded in TS12, reading may be stopped after TS12 is read.

Subsequently, TS from TS12 to TS22 is read out until the next lOOm after the internal PCR 1 2 0 4 as a reference. Then, after reading TS22, reading is stopped. Or, even if reading is stopped after reading TS up to TS24. In this way, the difference between the playback PCR 1202 and the internal PCR 1204 is detected within each internal PCR reference time, and the amount of playback data read from the playback buffer is adjusted.

Next, the capacity of the decoder buffers 4 0 2 and 8 0 2 (or 9 0 2) shown in FIGS. 4 and 8 (or FIG. 9) will be described.

FIG. 13 shows the transition of accumulated data in the decoder buffer 4 0 2 with respect to the data in which the PATS shown in FIG. 3 is recorded. This is the data read out from the 1 3 0 2 power reproduction buffer 3 0 2. 1 3 0 1 Force Read data 1 3 0 2 PATS.

1 3 0 3 Force PATS equivalent time generated from the internal counter.

1 3 0 4 Force This is the transition of buffer accumulated data in decoder buffer 4 0 2.

Since 1 3 0 4 is controlled by PATS, it does not cause an overflow or underflow beyond a certain range.

With reference to FIG. 14, the transition of the accumulated data in the decoder buffer 80 2 with respect to the data in which the PATS shown in FIG. 6 is not recorded will be described. Here, one stream consisting of data in which PATS is not recorded is shared by two broadcast stations, and if the reproduction buffer 60 2 is read out for each ITS, the accumulated data stored in the decoder buffer 8 02 is stored. The transition of data is shown.

1 4 0 2 force; read data from the reproduction buffer 6 0 2.

1 4 0 1 Force S, Playback buffer time information of playback buffer 6 0 2.

1 4 0 3 is internal PCR time information. 1 4 0 4 Force Decoder buffer 8 0 2 buffer accumulated data transition, and accumulated data transition 1 4 0 4 As is clear from 1 4 0 4, it is not normal to cause overflow and underflow beyond a certain range .

With reference to FIG. 15, the transition of the accumulated data in the decoder buffer 82 with respect to the data that is not recorded in the PATS shown in FIG. 6 and is continuously read from the reproduction buffer will be described. 1 5 0 2 Force Playback buffer 6 0 2 continuous read data, 1 5 0 1 Force playback buffer 6 0 2 playback PCR time information.

1 5 0 3 Force Internal PCR time information.

1 5 0 4 Force Decoder buffer 8 0 2 buffer accumulated data transition. As is clear from this data transition '1 5 0 4, while reading continuous data from playback buffer 6 0 2, decoder buffer 8 0 2 On the other hand, when the continuous data reading from the reproduction buffer 6 0 2 is completed, the data stored in the decoder buffer 8 0 2 decreases. The capacity of the decoder buffer 82 is required to be able to record all data in the PCR interval in addition to the buffer amount specified by the MPEG format. For example, when the broadcast bit rate is 20 Mbps and the PCR interval is 100 msec, an additional capacity of 2 Mbit or more is required.

Or the additional capacity more than the above is required for the capacity when PATS is recorded. For example, if the capacity when PATS is recorded is 1Mbit, the data bit rate is 20Mbps, and the PCR interval is 100msec, an additional capacity of 3Mbit or more is required.

As described above, the read buffer 60 2 read stop and start control have been mainly described as examples, but read stop and read control at a plurality of stages are also possible. In this case, it is possible to perform low-speed reading or stop reading when the regenerative PCR advances a certain value or more with respect to the internal PCR, and to perform high-speed reading when the value falls below a certain value.

In addition, low-speed reading or reading can be stopped when the regenerative PCR progresses above a certain value relative to the internal PCR, and high-speed reading can be performed when the internal PCR proceeds above a certain value relative to the regenerative PCR.

Also, when the internal PCR advances over a certain value relative to the regenerative PCR, high-speed reading is performed. It is possible to read at a low speed or stop reading when the PCR falls below a certain value relative to the regenerated PCR.

Fig. 12 shows the case where the read data is read discretely. However, even if there is no information on the broadcasting station sharing one stream, the playback buffer can be read continuously. .

Figure 16 shows an example of a PCR comparison timing chart in that case.

1 6 0 1 indicates 100 msec based on internal PCR.

1 6 0 3 is a reproduction TS.

Reference numeral 1 6 0 2 denotes a reproduction PCR detected from the reproduction TS as time information. 1 6 0 4 indicates internal PCR as time information.

The PCR of the playback TS shall be recorded once every 100 msec, and the PCR shall advance 12 counts at 100 msec. Therefore, the actual PCR is recorded only in TS0, TS12, TS24, '' 'and not in other TS. However, 1 6 0 2 shows all PCR information for explanation. Also, since it is continuous data, it shall have all PCR values.

In TS0, regenerative PCR and internal PCR are combined, and 12 TSs from TS0 to TS11 are read out within 100m from the internal PCR. Then, after reading TS11, reading is stopped. Or, if you are not sure whether or not PCR is recorded in TS12, you can stop reading after reading TS12.

Subsequently, 12 TSs TS12 to TS23 are read out until the next 100m after the internal PCR. Then, after reading TS23, reading is stopped. Alternatively, reading may be stopped after reading TS24.

In this way, the difference between playback PCR and internal PCR is detected within each internal PCR reference time, and the amount of playback data read from the playback buffer is adjusted.

In the above, an example has been shown in which data having a playback reference clock that matches the internal reference clock is read from the playback buffer and written to the node buffer or decoder buffer. The same applies when reading from the playback buffer and writing to the Z or decoder buffer during the matching internal reference clock period. By the way, the buffer capacity of the playback buffer and decoder buffer may be specified as follows.

That is, when the PATS appearance time interval is a second and the recorded PCR appearance time interval is b seconds, the buffer capacity of the playback buffer and decoder buffer is approximately b Z a compared to when PATS is recorded. And

For example, when the broadcast bit rate is 10 Mbps, the TS is composed of 188 bytes, so the TS appearance time interval, that is, the PATS application time interval a is 1/6650 seconds. On the other hand, the appearance time interval b of PCR is usually 1/10 second. Therefore, the Koffa capacity is 665 times.

FIG. 17 shows still another example of the bucket playback block 60 3 shown in FIG. 6 in a PC-based recorder. First, the reproduction buffer read data 1701 is input to the packet reproduction block 603 shown in FIG. The reproduction buffer read data 1 7 0 1 is supplied to the bucket block 1 7 0 2 and simultaneously to the PCR detection block 1 7 0 4. The PCR detection block 1704 detects the PCR from MPEG-TS and outputs the detected timing. The PCR detected in the PCR detection block 170 4 is input to the PCR comparison block 1 70 8 as a regenerative PCR and simultaneously input to the output request 1 7 09 as the detection timing. On the other hand, a PC-based recorder or player generates a built-in clock 1 7 0 5, and in the counter 1 7 0 6 and timer 1 7 0 7 from the clock 1 7 0 5, the internal unit of the same unit as PCR Generate timer data. The timer data generated by timer 1 7 0 7 is input to PCR comparison block 1 7 0 8.

The PCR comparison block 1 7 0 8 compares the regenerated PCR as A and the internal timer data as B. Here, if regenerative PCR is output as time, internal timer data is also output as time, and if regenerative PCR is output as 27 MHz counter value, internal timer data is also output as 27 MHz counter value, etc. Both are compared in the same unit. In 1 7 0 8, when A is B, or, the comparison output is output.

The output request block 1 7 0 9 receives the PCR comparison output and the PCR detection timing. At this time, if the PCR comparison output (A <B or A ≤ B) is input, the playback buffer When a PCR detection timing is input, a signal to stop reading the playback buffer is generated and output to the buffer input 1 7 1 0.

Buffer output read at normal timing 1 7 0 1 is a bucket block

Bucket conversion is performed by 1 7 0 2, and bucket playback data is output from the bucket playback output 1 7 0 3.

FIG. 18 shows a timing chart for explaining the operation of FIG.

PCR detection block 1 7 0 4 PCR detection interval is 100 msec, timer 1 7

The CPU timer by 0 7 shall be generated at 30 msec intervals.

1 8 0 1 indicates the CPU timer generation interval.

1 8 0 2 indicates the timing at which PCR is detected.

1 8 0 3 indicates the time calculated from PCR, or the PCR value shown in FIG. 12 or FIG.

1 8 0 4 represents the reproduction buffer read timing.

1 8 0 5 indicates the timing when A≤B.

In FIG. 18, as shown in 1 8 0 4, reading of the reproduction buffer is started by 1 7 0 9 and 1 7 1 0 at time 0. And at the timing shown in 1 8 0 2

1 Detect PCR with a value of 100msec shown in 80 3 and stop reading the playback buffer. Next, since CPU timer data is generated at 30 msec intervals, 100 msec indicated by PCR cannot be detected, and at 120 msec, A = 100 msec, B = 120 msec, that is, A≤B, and reading of the playback buffer starts. To do. Also, reading of the playback buffer is stopped at the timing when the PCR of 200 msec is read, and reading of the playback buffer is started when the CPU timer data reaches 210 msec.

By repeating these steps, it is possible to keep stable buffer operation in the playback buffer.

Next, another example of the buffer capacity of the reproduction buffer is shown.

The buffer capacity of the playback buffer is a value obtained by subtracting the average amount of data read out at least after writing to the playback buffer in bursts, that is, the average playback buffer read unit is subtracted from the playback buffer write unit. Value. Here, the average playback buffer read unit is the TS buffer rate playback buffer write unit. The playback buffer write unit time is set to the value obtained by multiplying the playback buffer write unit by the playback buffer write rate.

For example, if the playback buffer write unit is set to lMByte as the capacity to write to the playback buffer at a time, the TS rate is 25 Mbps, and the playback buffer write rate is 40 Mbps, the playback buffer write unit time = playback buffer write unit no playback buffer write rate. —G = lMByte / 40Mbps = 0.2 sec

Average playback buffer read unit = TS rate X Playback buffer write unit time = 25Mbps X 0.2 sec = 0.625MByte

Buffer capacity of playback buffer = Playback buffer write unit Average playback buffer Read unit = 1MByte— 0. 625MByte = 0. 375MByte

It can be calculated as follows.

Next, another example of the buffer capacity of the decoder buffer is shown.

The buffer capacity of the decoder buffer shall be at least the value specified by the decoder model called T-STD model in MPEG-2 and the decoder buffer write unit. Here, the decoder buffer writing unit is a value obtained by multiplying the TS rate by (the reproduction reference clock period, that is, the PCR period + the internal clock timer period).

For example, if the playback buffer write unit is lMByte, the TS rate is 25 Mbps, the PCR period is 100 msec, and the internal clock timer period is 30 msec,

Decoder buffer writing unit = TS rate X (PCR period + internal clock timer one period) = 25Mbps X (I00msec + 30msec) = 0.4062525MByte

Buffer capacity of decoder buffer = value specified by decoder model + decoder buffer write unit = value specified by decoder model + 0.4062525MByte

It can be calculated as follows.

The playback buffer write speed is the medium read speed, and the read buffer read speed is the value between the medium read speed and the TS rate.

For example, if the medium read unit is 40 Mbps and the TS rate is 25 Mbps, the playback buffer write speed = medium read speed = 40 Mbps

Medium read speed> Read speed of playback buffer> TS rate 40Mbps> Read speed of playback buffer> 25Mbps

It can be calculated as follows.

In the above embodiment, PCR is shown, but the same applies to time information such as OPCR (Original Program Clock Reference), PTS (Presentation Time Stamp), DTS (Decoding Time Stamp) _N, and the like.

In addition, the buffer capacity of the decoder buffer when a stream transmitted via the digital interface is received is specified as follows.

That is, a capacity that can store at least the number of data bits transmitted at PCR intervals is required. For example, if the data bit rate is S 10 Mbps and the PCR interval is 50 msec, a capacity of 0.5 Mbit or more is required.

Or the additional capacity more than the above is required for the capacity when PATS is recorded. For example, if the capacity when PATS is recorded is 0.5 Mbit, the data bit rate is 10 Mbps, and the PCR interval is 50 msec, a capacity of 1 Mbit or more is required. Alternatively, when the PATS appearance time interval is a second and the recorded PCR appearance time interval is b seconds, the buffer capacity of the decoder buffer is approximately b Za compared to when the PATS is recorded.

For example, when the broadcast bit rate is 10 Mbps, the TS is composed of 188 bytes, so the TS appearance time interval, that is, the PATS application time interval a is 1/6650 seconds. On the other hand, the appearance time interval b of PCR is usually 1/10 second. Therefore, the buffer capacity is 665 times.

Alternatively, the buffer capacity of the decoder buffer shall be at least the value specified by the decoder model called T-STD model in MPEG-2 and the decoder buffer write unit. Here, the decoder buffer writing unit is a value obtained by multiplying the TS rate by (reproduction reference clock period, that is, PCR period + internal clock timer period).

The decoder buffer when receiving a stream transmitted through the digital interface may be specified as follows.

In other words, the data is reproduced by a decoder having an arbitrary decoder buffer, and when the amount of data stored in the decoder buffer exceeds a certain value, it is transmitted to the digital transmission device. Request retransmission.

In the above embodiment, PCR is shown, but the same applies to OPCR (Original Program Clock Reference), PTS (Presentation Time Stamp), DTS (Decoding Time Stamp), and other time information.

Next, we will explain the time search when there is no time map or time table.

Digital broadcasting is basically CBR (Constant Bit Rate). This indicates that the number of bits per hour is almost constant. In this case, a rough time search can be realized without recording a time map.

In other words, since the number of sectors required for recording the title is known from the recording time when a title is recorded, the recording start sector one address, and the recording end sector one address, the number of sectors per unit time Is calculated. That is, if the recording time is c and the number of sectors required for recording is d, the number of sectors per second is dZc. Thus, for example, when searching after 1000 seconds, a rough search can be realized by searching from the current sector to 1000 X dZc. As described above, the buffer that reads the data reproduced from the medium and reads the data sent to the decoder is the playback buffer, and the buffer in the decoder is the decoder buffer.

Claims

The scope of the claims

1. Data recording, characterized by recording a transport stream (TS) and not recording a time map indicating the relationship between time and recording position based on PTS (Presentation Time Stamp), which is the TS display time. Method.

2. A data recording method characterized by recording a transport stream (TS) and not recording a TSTS packet arrival time stamp (PATS).

3. A data recording method characterized by recording a transport stream (TS) and not recording a time table indicating the relationship between the time and recording position based on PATS which is the arrival time of TS.

4. The playback reference clock read from the playback TS stream is compared with the internal reference clock generated by the clock in the device, and the timing to read data from the playback buffer and the Z or amount of data are controlled based on the result. A method for reproducing data recorded by the data recording method according to any one of claims 1 to 3.

5. A reproduction reference clock read from regenerated TS stream, click-locking the instrumentation置内compares the internal reference clock generated, the timing of writing data to the decoder buffer by a result, and _/ / or the amount of data A method for reproducing data recorded by the data recording method according to any one of claims 1 to 3, wherein control is performed.

6. When the difference between the value of the reproduction reference clock and the value of the internal reference clock reaches a certain value, reading from the reproduction buffer is stopped, and reading from the reproduction buffer is started when it reaches another certain value. The data reproduction method according to claim 4.

7. When the difference between the value of the regenerated reference clock and the value of the internal reference clock reaches a certain value, writing to the decoder buffer is stopped, and writing to the decoder buffer is started when it reaches another certain value. Claim 5 Data playback method.

8. The data reproduction method according to claim 4, wherein data having a reproduction reference clock that roughly matches the internal reference clock is read from the reproduction buffer.

9. The data reproduction method according to claim 4, wherein the data between the reproduction reference clocks is read from the reproduction buffer during an internal reference clock period substantially coincident therewith.

10. The data reproduction method according to claim 5, wherein data having a reproduction reference clock that roughly matches the internal reference clock is written to the decoder buffer.

11. The data reproduction method according to claim 5, wherein data between reproduction reference clocks is written to the decoder buffer during an internal reference clock period substantially coincident with the data.

1 2. Compare the value of the playback reference clock to the timer value generated from the internal clock, and start reading from the playback buffer based on the result, and stop reading from the playback buffer when a playback reference clock is detected. 5. The data reproduction method according to claim 4, wherein:

1 3. Compare the playback reference clock ^ t and the timer value generated from the internal clock, start writing to the decoder buffer based on the result, and write to the decoder buffer when the playback reference clock is detected. 6. The data reproduction method according to claim 5, wherein the data reproduction is stopped.

1 4. When the timer value generated from the internal clock is greater than or equal to the value of the playback reference clock or the offset plus, or larger, start reading from the playback buffer and writing to the buffer or decoder buffer. The data reproduction method according to claim 12, wherein the data reproduction method is a data reproduction method.

1 5. It is characterized in that writing to the playback buffer is stopped when the amount of data stored in the playback buffer reaches a certain value, and writing to the playback buffer is started when it reaches another constant value. 1 The data reproduction method according to 4.

1 6. Buffer capacity of playback buffer and decoder buffer 16. The data reproduction method according to claim 15, wherein the same value is set as compared with the case where the data recorded with the PATS is reproduced.

17. The data reproducing method according to claim 16, wherein a reproducing speed of the recording medium is sufficiently high.

1 8. Set the buffer capacity of the playback buffer to a capacity that can store at least the number of data bits transmitted in the time interval of the reference clock, and / or the buffer capacity of the decoder buffer as specified by the decoder model. 16. The data reproduction method according to claim 15, wherein a capacity capable of storing at least the number of data bits transmitted in the reference clock time interval is set in addition to the above value.

1 9. When the PATS appearance time interval is a second and the reference clock appearance time interval is b seconds, the buffer capacity of the playback buffer and / or decoder buffer is approximately a compared to when PATS is recorded. Claims characterized in that

1 The data reproduction method according to 5.

2 0. The buffer capacity of the playback buffer is at least the value obtained by subtracting the average playback buffer read unit from the playback buffer write unit, the average playback buffer read unit is the TS rate multiplied by the playback buffer write unit time, The data reproduction method according to claim 19, wherein the reproduction buffer write unit time is a value obtained by dividing the reproduction buffer write unit by the reproduction buffer write rate.

2 1. The buffer capacity of the decoder buffer is at least the value specified by the decoder model plus the decoder buffer write unit, the decoder buffer write unit is the TS rate, (reproduction reference clock period + internal clock timer) The data reproduction method according to claim 20, wherein a value obtained by multiplying (period) is obtained.

2 2. Reference clock force PCR (Program Clock Reference), and / or OPCR (Original Program Clock Reference), and Z or PTS

The data recording method according to claim 21, wherein the data recording method is a (Presentation Time Stamp) and / or DTS (Decoding Time Stamp) or other time information. How to play back recorded data.

23. The data transmission or reproduction method according to claim 22, wherein the data read from the reproduction buffer is transmitted from the digital interface after adding all or part of a header and overhead. .

2 4. According to claim 2 3, a stream transmitted by a digital interface is received,

A data reproducing method comprising: reproducing by a decoder having a decoder buffer defined by the method according to any one of claims 5, 7, 1 0, 1 1, 1 3, 14, and 16 to 2 2.

2 5. According to claim 2 3, a stream transmitted by a digital interface is received,

Playing back with a decoder with an arbitrary decoder buffer, and when the amount of data stored in the decoder buffer exceeds a certain value, the device sending to the digital transmission device requests retransmission. Data playback method.

26. The data recording / reproducing according to claim 25, wherein a buffer for writing data reproduced from a recording medium and reading data to be sent to a decoder is a reproduction buffer, and a buffer in the decoder is a decoder buffer. Transmission method.

27. A data recording / reproducing transmission apparatus for realizing data recording / reproducing transmission according to any one of claims 1 to 26.

2 8. A recording medium recorded by the data recording method according to claim 1.