JP4520483B2 - Recording / reproducing method and recording / reproducing apparatus - Google Patents

Description

  The present invention relates to a recording / reproducing method and a recording / reproducing apparatus, and more particularly to data processing such as navigation information addition, signal form conversion, and code rate conversion when dubbing digital data.

  In recent years, there has been a remarkable spread of DVD players. One of the reasons for this is the ease of use such as high-speed playback and cueing. This is largely due to the information of the navigation pack defined in the DVD video format. The navigation pack is arranged at the head of a VOBU that is a data unit defined in the DVD standard, and the navigation pack of each VOBU has a position indicating the positions of a plurality of VOBUs arranged before and after the VOBU. Since the information is described, the DVD player can instantaneously jump the playback position to the desired position. This is because the DVD video data is ROM data, and at the time of authoring, it is possible to know the position information of the VOBU whose processing order is later than the target VOBU to be processed (hereinafter referred to as future VOBU). is there. The VOBU is composed of one or more GOPs (data units in which random access is performed), and for convenience of explanation, the VOBU will be described as a GOP.

  However, in recent years, a system for recording AV data (audio video data) in real time, such as a DVD recorder or an HDD recorder, has become widespread. In this case, future data (data positioned after the data currently recorded) is used. It is impossible to write the position information. When all data is recorded at a fixed rate (CBR), this position information can be written, but in this case, compression efficiency is lowered, which is not desirable. That is, in a system for recording data at a variable rate (VBR) on a real-time recording device such as a DVD recorder or an HDD recorder, there is no means for recording information relating to future data as recorded in a navigation pack.

  Also, as a method of dubbing a digital signal once recorded on the HDD, a method of dubbing digital data back to analog data, or a method of dubbing the signal form (digital form) as it is conceivable can be considered. It is desirable to reduce the amount of information or convert the signal form according to the capacity of the signal. Even in a real-time recording device, there has been a demand for a method for recording position information of future data corresponding to a DVD video navigation pack.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a recording / reproducing method and recording / reproducing apparatus capable of recording AV data at a variable rate so that special reproduction is possible. And

  Another object of the present invention is to provide a recording / reproducing method and a recording / reproducing apparatus capable of making the amount of AV data information in accordance with the capacity of the recording medium to be dubbed when dubbing AV data. To do.

The recording / reproducing method according to claim 1 of the present invention reads data from a first recording medium on which first MPEG data divided into predetermined data units as one data group is recorded, and the read data the a recording method for recording on the second recording medium, the first recording and read out the first MPEG data from the medium, the first MPEG data per the partial data, the first the second recording medium while sequentially stored in different third recording medium and the position information indicating the position of data before and after that group against a specific data group of the MPEG data of said first, said A specific data group is sequentially obtained from the first MPEG data stored in the third recording medium, and the obtained position information is stored before the third recording medium is stored. Are sequentially added to the first of said specific data group in the MPEG data to generate second MPEG data, characterized in that the second MPEG data you recorded before Symbol second recording medium Is.

The recording / reproducing method according to claim 2 of the present invention is the recording / reproducing method according to claim 1 , wherein the generation of the second MPEG data indicates the position of the data group before and after the specific data group. the position information is a Turkey be added to the beginning vicinity of the specific data group in which the features.

The recording / reproducing method according to claim 3 of the present invention is the recording / reproducing method according to claim 1 , wherein the first MPEG data is read out by decoding the first MPEG data and usually the first MPEG data. and to read out faster than real time playback speed to display, wherein the second MPEG data recorded on the second recording medium, the second MPEG data, decodes the normal second MPEG data and it is characterized in the write-law on the second recording medium faster than real-time playback speed to be displayed Te.

Recording and reproducing method according to claim 4 of the present invention, there is provided a recording and reproducing method according to claim 1, wherein the first and second recording media, a hard disk, an optical disk, a semiconductor memory or a magnetic tape, And the third recording medium is a semiconductor memory.

According to a fifth aspect of the present invention, there is provided a recording / reproducing apparatus that reads data from a first recording medium on which first MPEG data divided into predetermined data units as one data group is recorded, and the read data a recording and reproducing apparatus for recording on the second recording medium, reading means for reading the first MPEG data from the first recording medium, the first MPEG data per the partial data, the second while sequentially accumulated in the third recording medium different from the first and second recording medium, the position information indicating the position of data before and after that group against a specific data group of the MPEG data of the first, for the particular data group, the third and sequentially obtaining information acquiring means from the stored in the recording medium the first MPEG data, said location information to said information acquiring means is determined The said third and information adding means which generates a second MPEG data are sequentially added to the specific data group in said first MPEG data stored in the recording medium, the second MPEG data and recording means that records before Symbol second recording medium is characterized in including it.

A personal computer according to a sixth aspect of the present invention reads data from a first recording medium on which first MPEG data divided into predetermined data units as one data group is recorded, and reads the read data. data processing you recorded in the second recording medium, a personal computer that performs the software, the data processing, a reading process of reading the first MPEG data from the first recording medium, the first the first MPEG data per the partial data, while sequentially accumulated in different third recording medium and the first and the second recording medium, its against a specific data group of the MPEG data of the first before and after the position information indicating the position of the data group for the particular data group, the third of the accumulated in the recording medium first MP of And sequentially obtaining information acquisition processing from the G data, the positional information obtained in the information acquisition process, sequentially added to the third said specific data group in said first MPEG data stored on a recording medium an information adding processing for generating a second MPEG data Te, in which the recording process records the second MPEG data before Symbol second recording medium is characterized in including it.

The recording / reproducing program according to claim 7 of the present invention reads data from a first recording medium on which first MPEG data divided into predetermined data units as one data group is recorded, and the read data the second recording medium to the recording process, a recording and reproducing program for a computer, a reading step of reading the first MPEG data from the first recording medium, the first MPEG data for each the partial data, the first and while sequentially stored in the third recording medium different from the second recording medium, data before and after that group against a specific data group of the MPEG data of the first position information indicating a position, on the particular data group sequentially determined from the third said accumulated in the recording medium the first MPEG data An information acquisition step, wherein the positional information obtained by the information acquisition step, wherein the third of said specific sequential addition to a second MPEG data group in said first MPEG data stored on a recording medium and information adding step of generating data, and a recording step that records the second MPEG data before Symbol second recording medium is characterized in including it.

As described above, according to the record reproduction method of the present invention, reads data from the first recording medium in which a first MPEG data partitioning predetermined data unit as a data group is recorded, read out A recording / reproducing method for processing the processed data and recording it on a second recording medium, wherein the first MPEG data is read from the first recording medium, and the read first MPEG Recording data on a third recording medium different from the first and second recording media, reading the first MPEG data from the third recording medium, and the read first Information acquisition step for obtaining position information indicating the positions of the data groups before and after the specific data group of the first MPEG data based on the MPEG data of An information adding step of generating the second MPEG data by adding the position information to a predetermined position of the first MPEG data, and the second MPEG data as the first recording medium. A recording step of recording substantially continuously on different second recording media, so that MPEG data can be recorded at a variable rate so that special playback such as high-speed playback and heading can be performed. Can do. Further, it is possible to easily obtain position information indicating the position of the GOP before and after each GOP.

According to record reproduction method of the present invention, reads from the data first recording medium in which a first MPEG data partitioning predetermined data unit as a data group is recorded, the processing of the read data Is a recording / reproducing method for recording on a second recording medium, and a reading step of reading the first MPEG data from the first recording medium; and decoding the read first MPEG data A decoding step for generating a decoded signal; a re-encoding step for re-encoding the generated decoded signal to generate second MPEG data; the generated second MPEG data as the first recording medium; Recording on a third recording medium different from the second recording medium, reading the second MPEG data from the third recording medium, and reading the second An information acquisition step for obtaining position information indicating the position of the data group before and after the specific data group of the second MPEG data based on the MPEG data of the second MPEG data; and a determined position of the second MPEG data An information adding step for generating third MPEG data by adding the position information to the recording medium, and a recording step for recording the third MPEG data on a second recording medium different from the first recording medium. Therefore, when dubbing MPEG data, the MPEG data can be recorded at a variable rate so that special reproduction such as high-speed reproduction or cueing can be performed, and the amount of MPEG data can be reduced. Depending on the capacity of the recording medium of the dubbing destination. Further, it is possible to easily obtain position information indicating the position of the GOP before and after each GOP.

According to record reproduction method of the present invention, in the recording and reproduction method, a reading step from said first recording medium, an information acquisition step, the information adding step, the recording step to the second recording medium, Since it is continuously performed in almost real time, MPEG data can be recorded at a variable rate so that special reproduction such as high-speed reproduction and heading can be performed. Further, it is possible to easily obtain position information indicating the position of the GOP before and after each GOP.

According to record reproduction method of the present invention, in the recording and reproducing method, wherein the first recording medium, as the first MPEG data, MPEG data of a fixed-rate is recorded, the re-encoding step Is characterized in that variable-rate MPEG data is generated as the second MPEG data by re-encoding the decoded signal corresponding to the fixed-rate MPEG data. It is possible to convert from a fixed rate to a variable rate.

According to record reproduction method of the present invention, in the recording method, the information acquisition step includes a step of recording the MPEG data of a variable rate as the second MPEG data to the third recording medium, said 3 Reading out the variable rate MPEG data from the recording medium, and position information indicating the positions of the data groups before and after the specific data group of the variable rate MPEG data based on the read out variable rate MPEG data Therefore, it is possible to easily obtain position information indicating the positions of the GOPs before and after each GOP.

According to record reproduction method of the present invention, in the recording and reproducing method, the re-encoding step has a predetermined resolution, the decoded signal corresponding to the first MPEG data, having a lower than the resolution Resolution A conversion step of converting the signal into a signal, and a step of re-encoding the converted signal to generate the second MPEG data. Therefore, the MPEG data is converted from the signal having a predetermined resolution to the resolution. It can be converted into a signal having a lower resolution and dubbed.

According to record reproduction method of the present invention, in the recording and reproducing method, wherein the first decoded signal corresponding to the MPEG data are high definition signals, signals generated said decoded signal by resolution converting the standard signal Therefore, MPEG data can be dubbed by converting from a high definition signal to a standard signal.

According to record reproduction method of the present invention, in the recording method, the information adding step, the for a particular data group, the position information indicating the position of the data before and after a group, the head of the specific data groups Since it is added in the vicinity, there is an effect that it is possible to reproduce MPEG data even with a DVD player.

According to record reproduction method of the present invention, in the recording and reproducing method, the reading step, the first MPEG data, read out in a normal faster than real-time playback speed to be displayed by decoding the first MPEG data And the recording step writes the second MPEG data onto the second recording medium at a speed higher than a real-time reproduction speed that normally decodes and displays the second MPEG data. Therefore, data processing such as position information addition, code rate conversion, and signal form conversion for MPEG data can be performed during high-speed dubbing of MPEG data.

According to record reproduction method of the present invention, in the recording and reproducing method, wherein the decoding step is to generate a video decoded signal by only decoding video data included in the first MPEG data, the re The encoding step re-encodes the video decoded signal to generate re-encoded video data, and the re-encoded video data is delayed audio data obtained by delaying audio data included in the first MPEG data, Multiplexed data is generated, and the recording step is characterized in that the multiplexed data is recorded as the second MPEG data. It becomes possible to prevent.

According to record reproduction method of the present invention, in the recording and reproducing method, the re-encoding step, the data to insert the external audio data obtained by coding the audio signal from the external, the second MPEG data Any of insertion processing, data replacement processing for replacing the external audio data with audio data in the second MPEG data, or data synthesis processing for combining the external audio data with audio data in the second MPEG data Since one data process is performed, there is an effect of enabling post-recording at the time of dubbing.

According to record reproduction method of the present invention, in the recording and reproducing method, wherein the first and second recording medium is either a hard disk, an optical disk, a semiconductor memory or a magnetic tape, said Since the third recording medium is a semiconductor memory, the dubbing of AV data has almost no restrictions on the type of recording medium on which AV data is recorded or the type of recording medium to which the AV data is dubbed. It can be done without receiving.

According to record reproduction apparatus of the present invention, reads from the data first recording medium in which a first MPEG data partitioning predetermined data unit as a data group is recorded, the read data record A recording / reproducing apparatus for performing a reproduction process, wherein the first MPEG data is read out based on the read-out means for reading out the first MPEG data from the first recording medium and the first MPEG data read out. Information acquisition means for obtaining position information indicating positions of data groups before and after a specific data group, and generating the second MPEG data by adding the position information to a predetermined position of the first MPEG data Information adding means for recording, and recording means for recording the second MPEG data on a second recording medium different from the first recording medium substantially continuously, The information acquisition means includes means for recording the first MPEG data on a third recording medium different from the first and second recording media, and the first MPEG data from the third recording medium. And a means for obtaining position information indicating positions of preceding and succeeding data groups with respect to a specific data group of the first MPEG data based on the read first MPEG data. Therefore, it is possible to record MPEG data at a variable rate so that special reproduction such as high-speed reproduction and cueing is possible. Further, it is possible to easily obtain position information indicating the position of the GOP before and after each GOP.

According to record reproduction apparatus of the present invention, reads from the data first recording medium in which a first MPEG data partitioning predetermined data unit as a data group is recorded, the read data record A recording / reproducing apparatus for performing reproduction processing, wherein the reading means reads the first MPEG data from the first recording medium, and the decoding means decodes the read first MPEG data to generate a decoded signal. Re-encoding means for re-encoding the decoded signal to generate second MPEG data; and data before and after the specific data group of the second MPEG data based on the second MPEG data Information obtaining means for obtaining position information indicating the position of the group; and third MPEG data by adding the position information to a predetermined position of the second MPEG data Information adding means for generating, and recording means for recording the third MPEG data on a second recording medium different from the first recording medium, wherein the information acquiring means stores the second MPEG data Means for recording on a third recording medium different from the first recording medium and the second recording medium; means for reading out the second MPEG data from the third recording medium; On the basis of a specific data group of the second MPEG data, and means for obtaining position information indicating the position of the data group before and after the specific data group. When dubbing MPEG data, the MPEG data Can be recorded at a variable rate so that special playback such as high-speed playback and cueing can be performed. It can be made in response to the capacity of the recording medium. Further, it is possible to easily obtain position information indicating the position of the GOP before and after each GOP.

According to record reproduction apparatus of the present invention, the the recording and reproducing apparatus, operations of the the reading means from the first recording medium, an information acquisition unit, and an information adding means, the recording means to the second recording medium Is performed continuously in almost real time, so that MPEG data can be recorded at a variable rate so that special reproduction such as high-speed reproduction and heading can be performed. Further, it is possible to easily obtain position information indicating the position of the GOP before and after each GOP.

According to path over coarsely braided computer of the present invention, it reads from the data first recording medium in which a first MPEG data partitioning predetermined data unit as a data group is recorded, records the read data A personal computer for performing data processing to be reproduced by software, wherein the data processing includes reading processing for reading the first MPEG data from the first recording medium, and reading the first MPEG data. Based on the information acquisition processing for obtaining the position information indicating the position of the data group before and after the specific data group of the first MPEG data, and the position information at the determined position of the first MPEG data. An information adding process for generating second MPEG data by adding the second MPEG data to the first recording medium; And a recording process for recording the first MPEG data on the second recording medium, which is different from the first recording medium and the second recording medium. A process for recording on a recording medium, a process for reading the first MPEG data from the third recording medium, and a specific data group of the first MPEG data based on the read first MPEG data, It is characterized by comprising processing for obtaining position information indicating the positions of the data groups before and after that, so that MPEG data can be recorded at a variable rate so that special reproduction such as high-speed reproduction and cueing can be performed. it can. Further, it is possible to easily obtain position information indicating the position of the GOP before and after each GOP.

According to path over coarsely braided computer of the present invention, it reads from the data first recording medium in which a first MPEG data partitioning predetermined data unit as a data group is recorded, records the read data A personal computer that performs software data processing for reproduction, wherein the data processing includes reading processing for reading the first MPEG data from the first recording medium and decoding the read first MPEG data. A decoding process for generating a decoded signal, a re-encoding process for re-encoding the decoded signal to generate second MPEG data, and a second MPEG data based on the second MPEG data. An information acquisition process for obtaining position information indicating positions of preceding and succeeding data groups for a specific data group, and the second MPE An information addition process for generating third MPEG data by adding the position information to a predetermined position of data, and recording the third MPEG data on a second recording medium different from the first recording medium The information acquisition process includes: a process for recording the second MPEG data on a third recording medium different from the first and second recording media; and the third recording medium. A process for reading out the second MPEG data from the second MPEG data, and a process for obtaining position information indicating the positions of the data groups before and after the specific data group of the second MPEG data based on the read second MPEG data Therefore, when dubbing MPEG data, the MPEG data can be played at a variable rate, and at the same time, special playback such as high-speed playback and cueing is possible. Can be recorded, further information of MPEG data, it can be made in accordance with the capacity of the dubbing destination recording medium. Further, it is possible to easily obtain position information indicating the position of the GOP before and after each GOP.

According to record reproduction program of the present invention, reads from the data first recording medium in which a first MPEG data partitioning predetermined data unit as a data group is recorded, the read data record A recording / reproduction program for performing reproduction processing by a computer, wherein the first MPEG data is read from the first recording medium, and the first MPEG data is read based on the read first MPEG data. An information acquisition step for obtaining position information indicating positions of preceding and succeeding data groups for a specific data group of one MPEG data; and adding the position information to a predetermined position of the first MPEG data An information adding step for generating the MPEG data and a second MPEG data different from the first recording medium. A step of recording the first MPEG data on a third recording medium different from the first recording medium and the second recording medium. A step of reading the first MPEG data from the third recording medium, and based on the read first MPEG data, a data group before and after the specific data group of the first MPEG data. Since it comprises the step of obtaining position information indicating the position, the MPEG data can be recorded at a variable rate so that special reproduction such as high-speed reproduction and cueing is possible. Further, it is possible to easily obtain position information indicating the position of the GOP before and after each GOP.

According to record reproduction program of the present invention, reads from the data first recording medium in which a first MPEG data partitioning predetermined data unit as a data group is recorded, the read data record A recording / reproducing program for performing reproduction processing by a computer, wherein a reading step for reading the first MPEG data from the first recording medium, and a decoding signal obtained by decoding the read first MPEG data A decoding step for generating, a re-encoding step for re-encoding the decoded signal to generate second MPEG data, and a specific data group of the second MPEG data based on the second MPEG data An information acquisition step for obtaining position information indicating the positions of the preceding and succeeding data groups, and determination of the second MPEG data An information adding step for generating the third MPEG data by adding the position information to the determined position, and a recording step for recording the third MPEG data on a second recording medium different from the first recording medium The information acquiring step includes: recording the second MPEG data on a third recording medium different from the first and second recording media; and extracting the second MPEG data from the third recording medium. And a step of obtaining position information indicating the positions of data groups before and after the specific data group of the second MPEG data based on the read second MPEG data. Therefore, when dubbing MPEG data, the MPEG data can be played at a variable rate, and special playback such as high-speed playback and cueing is possible. Can be recorded so as to be further information amount of MPEG data, it can be made in accordance with the capacity of the dubbing destination recording medium. Further, it is possible to easily obtain position information indicating the position of the GOP before and after each GOP.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
(Embodiment 1)
1 and 3 are block diagrams for explaining a recording / reproducing method according to Embodiment 1 of the present invention. FIG. 1 shows an entire recording / reproducing apparatus that performs dubbing of AV data by the recording / reproducing method. FIG. 3 shows a part of the recording / reproducing apparatus shown in FIG.

  The MPEG data stored in the HDD 8 as the first recording medium is read from the HDD 8 by the reproducing means 10 and reproduced to obtain an MPEG stream (AV data). There are various MPEG streams such as a transport stream, a program stream, and an elementary stream. The analysis unit 30 analyzes the position of each GOP on the MPEG stream and recognizes the positional relationship between a predetermined GOP and the preceding and subsequent GOPs. The navigation information adding means 6 adds position information indicating the positions of the preceding and following GOPs to a predetermined position near the head of a predetermined GOP based on an instruction from the analyzing means 30. At this time, the navigation information adding means 6 uses the memory means 19 as necessary. The memory means 19 may be a semiconductor memory or a recording medium such as an HDD. The MPEG stream to which the navigation information is added is recorded on the optical disk 9 as the second recording medium by the recording means 7. Here, the predetermined GOP to which the navigation information is added is all GOPs included in the MPEG stream. However, the GOP to which the navigation information is added may be selected based on a certain standard from all the GOPs included in the MPEG stream.

  This operation is not limited to being performed in real time, but may be performed at a speed faster than the actual operation (normal decoding display operation) or may be performed at a speed slower than the actual operation. It depends on the processing capability of the means 30 and the like. The processing of the analysis unit 30 may be performed by the navigation information addition unit 6 as part of the navigation information addition processing, or may be performed by the CPU 18.

  Next, the recording / reproducing method according to Embodiment 1 of the present invention will be described in more detail with reference to FIG. FIG. 1 is a block diagram showing a detailed configuration of a recording / reproducing apparatus according to Embodiment 1 of the present invention.

  The video signal input from the terminal 20 is AD converted by the AD conversion means 1, sent to the video encoding means 2 through the switch S 1, and the video encoded data output from the video encoding means 2 is sent to the system encoding means 5. It is done.

  The voice signal input from the terminal 21 is AD-converted by the AD conversion means 3 and sent to the voice coding means 4 through the switch S2, and the voice coded data which is the output of the voice coding means 4 is sent to the system via the switch S3. It is sent to the encoding means 5.

  The video data and the audio data are multiplexed by the system encoding means 5, and the MPEG data obtained by the multiplexing is sent to the switch S4 and the switch S6. The signal passed through the switch S4 is input to the navigation information adding means 6, and the output of the navigation information adding means 6 is output to the switch S5. The navigation information adding means 6 uses a memory means 19 as a storage medium as required.

  A 1394 signal is input from the terminal 22 and is output to the switch S5 via the 1394 I / F means 16. The output of the switch S5 is converted into a recording signal by the recording means 7 and recorded on the HDD 8 serving as the first recording medium or the optical disk 9 serving as the second recording medium. A reproduction signal read out and reproduced by the reproduction means 10 from the HDD 8 as the first recording medium or the optical disk 9 as the second recording medium is reproduced by the video decoding means 11, the audio decoding means 12, and the audio delay means. 13, supplied to the analysis means 30, the switch S4, the switch S5, and the switch S6.

  The video signal decoded by the video decoding unit 11 is supplied to the switch S1 and is input to the DA conversion unit 14 and is output to the terminal 23 as a reproduced video signal. The audio signal decoded by the audio decoding unit 12 is supplied to the switch S2 and input to the DA conversion unit 15 and output to the terminal 24 as a reproduced audio signal. The output of the audio delay means 13 is output to the switch S3. The output of the switch S6 is inputted to the 1394 I / F means 17 and outputted to the terminal 25 in the form of 1394. At this time, the CPU 18 controls the overall operation of the recording / reproducing apparatus.

Here, consider a case where signals from the terminals 20 and 21 are recorded at a variable rate.
A signal is generated by the above-described recording system, that is, the means 1-7. At this time, the navigation information adding means 6 needs to add the position information of the previous and subsequent GOPs to a predetermined GOP. However, since the amount of data to be recorded in the future cannot be predicted by real-time recording, the position information of the previous and subsequent GOPs. Cannot be added. Therefore, the data input to the navigation information adding means 6 is sent to the recording means 7 without adding the position information of the previous and subsequent GOPs, converted into a recording signal, and recorded on the HDD 8.

  FIG. 2 is a schematic diagram showing a stream compliant with the DVD video standard. In the DVD, as described above, one or a plurality of GOPs constitute a data unit called VOBU. In the present invention, VOBU is described as a GOP for convenience. At the top of each GOP, information called a navigation pack is added. In this information, position information indicating the positions of the GOPs located before and after the GOP is entered so as to be useful during special playback. Yes. The DVD player realizes special reproduction such as high-speed reproduction based on this position information.

  Now, since the data recorded in the HDD 8 lacks the positional information of the GOPs before and after the hatching shown in FIG. 2, the reproduction operation is not guaranteed in a normal DVD player. However, it is possible to know the position information of the preceding and following GOPs by reading the already recorded data from the HDD 8 again. In order to add the position information obtained in this way, the recording / reproducing apparatus shown in FIG. 1 performs the following operation.

The following processing is performed so that the CPU 18 can detect the position information of the GOP of the data recorded in the HDD 8.
For example, data reproduction (reading of data) for a predetermined section of data recorded on the HDD 8 is executed and the reproduction data (read data) is analyzed by the analysis unit 30, or the recording unit 7 records the data on the HDD 8. At this time, the GOP position information is recorded in a predetermined position of the HDD 8 and stored.

  Thereafter, the reproduction data read and reproduced from the HDD 8 by the reproduction means 10 is sent to the switch S4. The reproduction data output from the switch S4 is navigation information adding means 6 in accordance with an instruction from the CPU 18, and navigation information including position information of GOPs before and after each GOP is determined at a position determined at the head of each GOP. The additional processing is performed, and the data is recorded on the HDD 8 or the optical disk 9 through the recording means 7. Here, since the recorded reproduction data includes navigation information, it can be reproduced by a normal DVD player.

  Note that the recording / reproducing apparatus of the first embodiment may be configured such that each of the above units is configured by hardware, or the processing by each of the above units may be performed by software.

  As described above, in the first embodiment of the present invention, the position of each GOP on the MPEG stream is obtained, the position information indicating the position of the GOP before and after the GOP is added to the MPEG stream, and the position is Since the MPEG stream to which the information is added is recorded on the optical disk 9, the MPEG data can be recorded at a variable rate so that special reproduction is possible.

(Embodiment 2)
Next, as a second embodiment, a recording / reproducing method for converting the code rate of the data recorded on the HDD first will be described.

  For example, data of a fixed rate (CBR) of 9 Mbps is recorded in the HDD 8. In order to permanently store this data, when dubbing on the optical disc 9, it is possible to record for a longer time, and consider the case where the data is converted into data of 3 Mbps variable rate (VBR) and recorded.

  First, 9 Mbps CBR data is read from the HDD 8 and played back, and is decoded by the video decoding means 11. The decoded data is supplied to the video encoding means 2 through the switch S1, and the decoded data is VBR encoded by the means 2. Re-encoded data (VBR data) obtained by VBR encoding of the decoded data is recorded as 3 Mbps VBR data on the HDD 8 via the system encoder means 5, the navigation information adding means 6, and the recording means 7.

  Here, since the navigation information adding means 6 does not yet know the position information of the future GOP for which the corresponding VBR data has not been input, the navigation information cannot be added to the VBR data in real time. Therefore, the position information of each GOP is recorded in a storage area different from the storage area of the VBR data in the semiconductor memory or HDD 8 that can be controlled by the CPU 18 when the VBR data is recorded in the HDD 8. Then, after re-encoding the CBR data so that the code rate is converted from 9 Mbps to 3 Mbps, the reproduction means 10 reads the 3 Mbps VBR data from the HDD 8 again. Further, the read VBR data is supplied to the navigation information adding means 6 through the switch S4, and the navigation information adding means 6 adds the navigation information including the position information of the GOP before and after each GOP to the VBR data. To do. The VBR data to which the navigation information is added is recorded on the optical disc 9 via the switch S5 and the recording means 7.

  As described above, according to the recording / reproducing method of the second embodiment of the present invention, the CBR data recorded on the HDD 8 is converted into VBR data by re-encoding, and the position information of each GOP of the VBR data is obtained. Since the position information of the GOP before and after each GOP is added to the VBR data and the VBR data to which the position information is added is then recorded on the optical disc 9, the information of the MPEG data is recorded when dubbing the MPEG data. The amount of MPEG data with a reduced amount of information can be recorded so that special reproduction is possible.

  In the above-described second embodiment, when navigation information is added to each GOP, the re-encoded 3 Mbps VBR data is temporarily recorded in the HDD 8, but the present invention is not limited to this. For example, the navigation information adding means 6 may have the memory means 19 as a work area, and the VBR data input to the navigation information adding means 6 may be temporarily stored in the memory means 19. In this case, the position information of the above-mentioned future GOP can be easily obtained, and the position information can be added to the VBR data almost in real time. In this case, 3 Mbps VBR data to which GOP position information is added is recorded on the optical disc 9 via the recording means 7.

  However, in this case, the position information of the previous and subsequent GOPs added to each GOP is limited to the position information of the GOP within the range corresponding to the data amount of the VBR data stored in the memory means 19. Specifically, when the memory unit 19 is a 256 Mbit DRAM, the navigation information adding unit 6 can know the position information of the future GOP separated by about 80 seconds for each GOP of the 3 Mbps VBR data. It becomes possible.

(Embodiment 3)
Next, as a third embodiment, a recording / reproducing method in which data recorded at first in the HDD is a digital broadcast signal and the rate is converted will be described.

  The digital broadcast signal is input in the form of an MPEG transport stream (TS data) from the terminal 22 in the 1394 format to the 1394 I / F means 16, and the TS data is recorded in the HDD 8 through the switch S 5 and the recording means 7. That is, the HDD 8 records a transport stream in MPEG as CBR data, and this stream does not include navigation information.

  In the third embodiment, the CBR data can be recorded on the optical disc 9 for a long time, so that the CBR data is converted into VBR data, and navigation information is added to the VBR data and recorded on the recording medium. .

In the third embodiment, the data recording / reproducing process is performed in substantially the same manner as in the second embodiment, but the video decoding means 11 decodes the CBR data, and the video encoding means 2 recodes the CBR data. The system encoding means 5 creates a program stream (PS) as AV data (MPEG data).
The method of adding the navigation information to the program stream is the same as in the second embodiment.

  Thereby, simultaneously with the code rate conversion, it is possible to convert the data form from TS data to PS data.

  According to the recording / reproducing method of the third embodiment of the present invention, the AV data recorded in the HDD 8 is subjected to rate conversion processing for converting the CBR data into the VBR data by re-encoding the AV data, and the AV data is further converted into TS. Stream format conversion processing for converting data to PS data is performed, and the position information of the GOP before and after each GOP is added to the AV data in which the code rate and the stream format are converted, and the AV data to which the position information is added is added. Since data is recorded on the optical disc 9, when dubbing AV data (MPEG data), the information amount of the MPEG data can be reduced, the data form can be converted, and the information amount can be reduced and the data format can be converted. The recorded AV data can be recorded so that special reproduction is possible.

(Embodiment 4)
Next, as a fourth embodiment, a recording / reproducing method for converting the code rate of data initially recorded on the HDD as an HD digital broadcast signal will be described.

  In the fourth embodiment, the video decoding means 11 decodes the CBR TS data corresponding to the high-definition signal (HD signal), and the decoded data corresponding to the HD signal corresponds to the standard signal (SD signal). The third embodiment is different from the third embodiment in that it has a function of converting (down-converting) into data to be converted.

  The CBR data corresponding to the standard signal output from the video decoding unit 11 is input to the video encoding unit 2 via the switch S1. In the means 2, the CBR data is converted into VBR data by re-encoding and input to the system encoding means 5. The AV data including VBR video data output from the system encoding means 5 is recorded in the HDD 8 or the memory means 19, and then navigation information is added to the optical disc as in the third embodiment. 9 is recorded.

  As described above, according to the recording / reproducing method of the fourth embodiment of the present invention, the rate conversion process for converting the AV data corresponding to the HD signal recorded on the HDD 8 from the CBR data to the VBR data by re-encoding is performed. In addition, the AV data is further down-converted from data corresponding to the HD signal to data corresponding to the SD signal, and the AV data subjected to the rate conversion process and the down-conversion process is subjected to the conversion for each GOP. Since the position information of the previous and subsequent GOPs is added and the AV data to which the position information is added is recorded on the optical disc 9, when the AV data (MPEG data) is dubbed, the information amount of the MPEG data is reduced and the definition is reduced. AV data with reduced information volume and reduced definition can be converted to special It can be recorded so that it is possible.

(Embodiment 5)
Next, a recording / reproducing method according to Embodiment 5 of the present invention will be described.
In the recording / reproducing method of the fifth embodiment, when re-encoding of audio data is unnecessary, only re-encoding of video data is performed. Here, the operations of re-encoding video data and adding GOP position information are the same as those in the second embodiment, and are therefore omitted.

  When the code rate of audio data is converted or when the encoding method is converted, re-encoding is necessary, and the following re-encoding is performed.

  The audio data output from the reproduction unit 10 is decoded by the audio decoding unit 12 and input to the audio encoding unit 4 via the switch S2 as decoded audio data. The decoded speech data input to the means 4 is re-encoded and input to the system encoding means 5 via the switch S3 as re-encoded speech data. In the means 5, the re-encoded audio data is multiplexed with the re-encoded video data and output as AV data.

  On the other hand, when re-encoding of the audio data is unnecessary, the output of the reproduction unit 10 is delayed by the delay unit 13 and input to the system encoding unit 5 via the switch S3 as delayed audio data. In the means 5, delayed audio data and re-encoded video data are multiplexed.

  As described above, according to the recording / reproducing method according to the fifth embodiment of the present invention, when re-encoding of audio data is unnecessary when re-encoding AV data recorded on the HDD 8, it is converted into AV data. Without re-encoding the included audio data, the audio data read from the HDD 8 is delayed and multiplexed with the re-encoded video data, and the AV data obtained by this multiplexing is recorded on the optical disc 9 Therefore, it is possible to prevent deterioration in sound quality due to re-encoding of the audio signal during dubbing.

  In addition, since the process of re-encoding video data and the process of adding navigation information to AV data (MPEG data) are performed in the same manner as in the second embodiment, when AV data is dubbed, the AV data is converted into the amount of information. Can be converted into data that can be played back specially.

(Embodiment 6)
Next, a recording / reproducing method according to Embodiment 6 of the present invention will be described.
The recording / reproducing method of the sixth embodiment is the same as the recording / reproducing method of the second embodiment except that it includes post-recording processing or audio multiplex processing. Here, the re-encoding process of video data and MPEG data are performed. A description of the process of adding navigation information is omitted.

First, the post-recording process of the recording / reproducing method of the sixth embodiment will be described.
Here, in the post-recording process, it is assumed that the viewer performs recording in accordance with the video displayed based on the playback video signal from the terminal 23 of the recording / playback apparatus (see FIG. 1).

  When an analog audio signal is input from the outside to the terminal 21 of the recording / reproducing apparatus, the audio signal is converted into a digital audio signal by the AD conversion means 3, and this digital audio signal is encoded by the audio through the switch S2. Input to means 4.

  The audio encoding unit 4 performs the encoding process of the digital audio signal, and the audio data obtained by the encoding process is input to the system encoding unit 5 through the switch S3. In the system encoder 5, the audio data is multiplexed with the re-encoded video data, and the multiplexed data is output to the navigation information adding unit 6 as AV data. This AV data is recorded on the optical disc 9 with navigation information added, as in the second embodiment.

  In this after-recording process, the audio data of the MPEG data recorded in the HDD 8 is replaced with the after-recording audio data input from the outside.

Next, audio multiplexing processing of the recording / reproducing method of the sixth embodiment will be described.
Here, it is assumed that the audio multiplexing process time-multiplexes original audio data and post-record audio data from the outside.

  The audio signal input from the outside is converted into a digital audio signal by the AD conversion unit 3 and input to the audio encoding unit 4 via the switch S2, as in the post-recording process. In the means 4, the digital audio signal is encoded, and the audio data (after-recording audio data) obtained by the encoding process is output to the switch S3.

  On the other hand, the audio delay means 13 outputs audio data obtained by delaying original audio data (audio data included in MPEG data recorded in the HDD 8), and the audio data is output to the switch S3.

  In the switch S3, a time axis multiplexing process for switching and selecting the after-recording audio data from the audio encoding unit 4 and the original audio data from the audio delay unit 13 is performed, and is obtained by the time axis multiplexing process. The multiplexed audio data is output to the system encoding means 5. The system encoder means 5 performs an AV multiplexing process for multiplexing the multiplexed audio data and the re-encoded video data, and the AV data obtained by the AV multiplexing process is output to the navigation information adding means 6. The This AV data is recorded on the optical disc 9 with navigation information added, as in the second embodiment.

  In the audio multiplex processing, after-recording audio data input from the outside is inserted into the MPEG data recorded in the HDD 8, and the MPEG data recorded on the optical disc 9 includes two audio streams. Become.

  As described above, according to the recording / reproducing method according to the sixth embodiment of the present invention, when MPEG data recorded on the HDD 8 is re-encoded, the original audio data included in the MPEG data is converted into audio data from the outside. Since replacement processing or processing for inserting audio data from outside into the MPEG data is performed, post-recording at the time of dubbing is possible.

  In the sixth embodiment, when MPEG data is re-encoded, the original audio data included in the MPEG data is replaced with external audio data, or external audio data is inserted into the MPEG data. Although the processing has been described, when MPEG data is re-encoded, processing for synthesizing original audio data included in the MPEG data with external audio data may be performed.

(Embodiment 7)
Next, a recording / reproducing method according to Embodiment 7 of the present invention will be described.
The recording / reproducing method according to the seventh embodiment adds navigation information to MPEG data in almost real time.

  FIG. 4 is a block diagram showing a schematic configuration of a recording / reproducing apparatus for recording MPEG data by the recording / reproducing method of the seventh embodiment.

  In addition to the configuration of the recording / reproducing apparatus of the first embodiment shown in FIG. 1, the recording / reproducing apparatus of the seventh embodiment encodes an STB (Set-Top Box) 31 that receives a digital broadcast signal and an analog video signal. Selects output data from the encoder 32, the distribution data receiving unit 33 that receives AV data such as MPEG data distributed via a computer network such as the Internet, and the STB 31, the encoder 32, and the distribution data receiving unit. And a switch S7 for outputting. However, in FIG. 4, the same reference numerals as those in FIG. 1 are the same as those in the recording / reproducing apparatus of the first embodiment, and the encoder 32 includes means 1 to 5 and switches S1 to S1 in the recording / reproducing apparatus shown in FIG. This corresponds to S3. Further, the output data of the switch S7 of the seventh embodiment corresponds to the output data of the system encoder 5 of the first embodiment.

  In the seventh embodiment, as the source of the recorded MPEG stream (MPEG data), output data of an STB (Set-Top Box) 31 that receives a digital broadcast signal, and output data of an encoder 32 that encodes an analog video signal Alternatively, output data of the distribution data receiving unit 33 that receives MPEG data distributed via a computer network such as the Internet can be considered.

  In the switch S7, output data is selected from among the STB 31, the encoder 32, and the distribution data receiving unit, and the MPEG stream supplied as output data from each unit is input to the navigation information adding unit 6 and the analyzing unit 30.

The operations of the navigation information adding means 6, the analyzing means 30 and the recording means 7 are performed in the same manner as the recording / reproducing apparatus of the first embodiment shown in FIG.
However, the seventh embodiment is different from the first embodiment in that a series of processing such as addition of navigation information and analysis of MPEG data needs to be performed almost in real time.

  That is, when MPEG data is input to the navigation information adding means 6, the navigation information adding means 6 performs a process of temporarily storing data in the memory means 19 that the means 6 has as a work area. The analysis unit 30 performs a position information detection process for detecting the position information of each GOP for the data stored in the memory unit 19. Then, the navigation information adding means 6 performs processing for adding, to the MPEG data, position information indicating the positions of the preceding and succeeding GOPs for each GOP based on the position information obtained by the analyzing means 30.

  However, in this case, the position information of the previous and subsequent GOPs added to each GOP is limited to the position information of the GOP in a range corresponding to the data amount of the MPEG data stored in the memory means 19.

  As described above, in the recording / reproducing method of the seventh embodiment, a digital broadcast signal or distribution data on the Internet is received and recorded as MPEG data, or an external analog video signal is encoded and recorded as MPEG data. At this time, the MPEG data is temporarily stored in the memory means 19 and the stored MPEG data is analyzed to obtain the position information of each GOP. Therefore, when recording the MPEG data, the MPEG data is recorded before and after each GOP. The process of adding the GOP position information can be performed almost in real time.

(Embodiment 8)
Next, a recording / reproducing method according to Embodiment 8 of the present invention will be described.
In the recording / reproducing method of the eighth embodiment, navigation information addition, code rate conversion, signal format conversion, and the like are performed during high-speed dubbing of AV data such as MPEG data.

  The data recorded on the recording medium HDD8 is normally read out at a real time reproduction speed because the data is decoded and displayed. However, when the decoding display process for the data is not performed or when the decoding display for the data is performed intermittently, the data can be read from the HDD 8 at a speed higher than the real time reproduction speed.

  Therefore, the recording / reproducing apparatus of the eighth embodiment performs the highest transfer of the data (first MPEG data) recorded on the HDD 8 (see FIG. 1) during dubbing without performing normal decoding display processing. AV data that has been subjected to the above data processing is read out at a rate, data processing such as navigation information addition, code rate conversion, signal form conversion in each of the above-described embodiments is performed at a speed higher than the real-time playback speed. The second or third MPEG data) is recorded on the optical disc 9 (see FIG. 1) at a speed higher than the real-time playback speed. Here, the CPU 18 (see FIG. 1) functions to control the entire system.

  As described above, in the recording / reproducing method according to the eighth embodiment of the present invention, when dubbing without performing normal decoding display processing is performed, the data recorded in the HDD 8 is read at a speed higher than the real-time reproduction speed. While performing high-speed dubbing of data, it is possible to add navigation information to MPEG data, convert a code rate, and convert a signal form.

  For example, when an HDD 8 with a maximum transfer rate of 20 Mbps is used and the normal playback speed of AV data recorded on the HDD 8 is 5 Mbps, high-speed dubbing at about 4 × speed is performed on the AV data. It is possible to perform data processing such as addition of the navigation information, conversion of the code rate, conversion of the signal form.

  In the eighth embodiment, the case where high-speed dubbing is performed in the recording / reproducing apparatus has been described. However, data (reproduction data) read from the HDD or data recorded on the optical disc during the high-speed dubbing process. (Recording data) may be sent to the STB or the like as a recording signal or a reproduction signal in 1394 format.

  In this case, these signals are output from the terminal 25 by supplying the recording signal or the reproduction signal to the 1394 I / F means 17 via the switch S6.

  In each of the above-described embodiments, the HDD and the optical disk are exemplified as the recording medium. However, the recording medium is not limited thereto, and the recording medium may be a magneto-optical disk, a magnetic tape, or a semiconductor memory.

  In each of the above embodiments, the SD signal, the HD signal, the CBR data, the VBR data, and the MPEG data (TS or PS) are shown as data recorded on the HDD. Digital data such as elementary data and DVC (digital video camera) may be used.

  Needless to say, the MPEG data mentioned in each of the above embodiments specifically corresponds to all MPEG standards such as MPEG1, MPEG2, MPEG4, MPEG7, and the like. Further, the first, second or third recording medium in the above embodiment may be a separate recording medium or the same recording medium.

  Further, in each of the above embodiments, the recording / reproducing apparatus is realized by hardware. However, these apparatuses may be realized by software. In this case, the recording / reproducing apparatus is constructed in an independent computer system by recording the recording / reproducing program for performing the recording / reproducing process described in each of the above embodiments on a data storage medium such as a floppy disk medium. It becomes possible to do.

  FIG. 5 is a diagram for explaining a case where the recording / reproducing process of each of the above embodiments is performed by a computer system using a floppy disk medium storing the recording / reproducing program.

  FIG. 5A shows an external appearance, a sectional structure, and a floppy disk medium main body of the floppy disk medium, and FIG. 5B shows an example of a physical format of the floppy disk medium main body.

  The floppy disk medium FD has a structure in which the floppy disk medium body D is accommodated in a floppy disk case FC, and a plurality of concentric circles are formed on the surface of the floppy disk medium body D from the outer periphery toward the inner periphery. Tracks Tr are formed, and each track Tr is divided into 16 sectors Se in the angular direction. Accordingly, in the floppy disk medium FD storing the program, the floppy disk medium main body D is such that data as the program is recorded in an area (sector) Se allocated thereon.

  FIG. 5C shows a configuration for recording the program on the floppy disk medium FD and recording / reproducing processing by software.

  When the program is recorded on the floppy disk medium FD, data as the program is written from the computer system (personal computer) Cs to the floppy disk medium FD via the floppy disk drive FDD. When the recording / reproducing apparatus is constructed in the computer system Cs by the program recorded on the floppy disk medium FD, the program is read from the floppy disk medium FD by the floppy disk drive FDD and loaded into the computer system Cs.

  In such a computer system, not only encoding and decoding of video signals and audio signals, but also writing and reading to a recording medium such as an HDD, an optical disk, and a memory can all be processed by software.

  In the description of FIG. 5, the description has been made using the floppy disk medium as the data storage medium. However, even when the optical disk is used, the recording / reproducing process by software can be performed as in the case of the floppy disk medium. In addition, the data storage medium is not limited to the above optical disk and floppy disk medium, and may be anything such as an IC card, a ROM cassette, etc. as long as it can record a program. Even when using these data recording media, Software recording / reproduction processing can be performed in the same manner as in the case of using the floppy disk medium or the like.

  The present invention relates to a recording / reproducing method and a recording / reproducing apparatus, and more particularly to data processing such as navigation information addition, signal form conversion, and code rate conversion when dubbing digital data.

It is a block diagram for demonstrating the detailed structure of the recording / reproducing apparatus of each embodiment of this invention. It is a schematic diagram explaining the structure of a stream. It is a block diagram which shows schematic structure of the recording / reproducing apparatus by Embodiment 1 of this invention. It is a block diagram which shows schematic structure of the recording / reproducing apparatus by Embodiment 7 of this invention. A diagram for explaining a data storage medium (FIGS. (A) and (b)) storing a program for performing the recording / reproducing process of each of the embodiments by a computer system, and the computer system (FIG. (C)) It is.

Explanation of symbols

1, 3 AD conversion means 2 Video encoding means 4 Audio encoding means 5 System encoding means 6 Navigation information adding means 7 Recording means 8 HDD
DESCRIPTION OF SYMBOLS 9 Optical disk 10 Reproduction | regeneration means 11 Video | video decoding means 12 Audio | voice decoding means 13 Audio | voice delay means 14, 15 DA conversion means 16, 17 1394IF means 18 CPU
19 memory means 20, 21, 22 terminals 23, 24, 25 terminals 30 analysis means 31 STB
32 Encoder 33 Data receiver S1 to S7 Switch Cs Computer system FD Floppy disk medium

Claims (7)

A recording / reproducing method in which data is read from a first recording medium on which first MPEG data divided into predetermined data units as one data group is recorded, and the read data is recorded on a second recording medium. There,
To read out the first MPEG data from the first recording medium,
For each the partial data the first MPEG data, against different third while sequentially accumulated in a recording medium, a specific data group of the MPEG data of said first and said first and said second recording medium that the position information indicating the position of data before and after that group, for the particular data group sequentially determined from said third recording medium into stored electrical first MPEG data, the positional information obtained the , Sequentially adding to the specific data group in the first MPEG data stored in the third recording medium to generate second MPEG data ;
The front Symbol a second MPEG data you recorded on the second recording medium,
And a recording / reproducing method. The recording / reproducing method according to claim 1 ,
The generation of the second MPEG data, the for a particular data group, recording that the positional information indicating the position of the data before and after the group, wherein the Turkey be added to the head near the particular data group Method. The recording / reproducing method according to claim 1 ,
The first of MPEG data reading, the first MPEG data, normally read out faster than real time playback speed to be displayed by decoding the first MPEG data,
The second MPEG data is recorded on the second recording medium by the second recording at a speed higher than the real-time reproduction speed at which the second MPEG data is normally decoded and displayed. written to the media free,
And a recording / reproducing method. The recording / reproducing method according to claim 1 ,
The first and second recording media are either a hard disk, an optical disk, a magneto-optical disk, a semiconductor memory, or a magnetic tape,
The third recording medium is a semiconductor memory;
And a recording / reproducing method. A recording / reproducing apparatus that reads data from a first recording medium on which first MPEG data divided into predetermined data units as one data group is recorded, and records the read data on a second recording medium. There,
Reading means for reading out the first MPEG data from the first recording medium;
For each the partial data the first MPEG data, against different third while sequentially accumulated in a recording medium, a specific data group of the MPEG data of said first and said first and said second recording medium that the position information indicating the position of data before and after that group, for the particular data group, and sequentially obtains information acquiring means from the third said accumulated in the recording medium the first MPEG data,
Information for generating second MPEG data by sequentially adding the position information obtained by the information acquisition means to the specific data group in the first MPEG data stored in the third recording medium. Additional means;
Including a recording unit that records the second MPEG data before Symbol second recording medium,
And a recording / reproducing apparatus. First read data from the first recording medium in which MPEG data is recorded, the read data processing data you a recorded in the second recording medium which is divided predetermined data unit as a data group Is a personal computer that performs software,
The data processing is
A reading process of reading the first MPEG data from the first recording medium;
For each the partial data the first MPEG data, against different third while sequentially accumulated in a recording medium, a specific data group of the MPEG data of said first and said first and said second recording medium that the position information indicating the position of data before and after that group, for the particular data group, and sequentially obtains information acquisition processing from the third said accumulated in the recording medium the first MPEG data,
Information for generating second MPEG data by sequentially adding the position information obtained in the information acquisition process to the specific data group in the first MPEG data stored in the third recording medium. Additional processing,
The second including a recording process that records before Symbol second recording medium MPEG data,
A personal computer characterized by that. A process of reading data from a first recording medium on which first MPEG data divided into a predetermined data unit as one data group is recorded, and recording the read data on a second recording medium. A recording / playback program for performing
A step of reading out the first MPEG data from the first recording medium;
For each the partial data the first MPEG data, against different third while sequentially accumulated in a recording medium, a specific data group of the MPEG data of said first and said first and said second recording medium that the position information indicating the position of data before and after that group, for the particular data group, and sequentially obtains information acquiring step from said third said accumulated in the recording medium the first MPEG data,
Information for generating second MPEG data by sequentially adding the position information obtained in the information acquisition step to the specific data group in the first MPEG data stored in the third recording medium. Additional steps;
Including a recording step that records the second MPEG data before Symbol second recording medium,
A recording / reproducing program characterized by the above.

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