JP2002218393A - Recording-reproducing method and apparatus thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording-reproducing apparatus capable of recording AV-data at a variable rate and moreover performing special reproductions. SOLUTION: The recording-reproducing apparatus for reading data from an HDD 8 and recording and reproducing the read data comprises a reproducing means 10 for reading first MPEG data from the HDD 8, an analyzing means 30 for obtaining position information indicating the positions of GOPs before and after a GOP of the first MPEG data, based on the first read MPEG data, a navigating information adding means 6 for adding the position information to a predetermined position of the first MPEG data to generate second MPEG data, and a recording means 7 for recording the second MPEG data on an optical disc 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing method and a recording / reproducing apparatus, and more particularly to data processing such as addition of navigation information, conversion of a signal form, and code rate conversion when digital data is dubbed.

[0002]

2. Description of the Related Art In recent years, the spread of DVD players has been remarkable. One of the reasons for this is the ease of use such as high-speed reproduction and cueing. This largely depends on the information of the navigation pack defined in the DVD video format. The navi-pack is located at the beginning of a VOBU which is a data unit defined by the DVD standard, and the navi-pack of each VOBU has a position indicating the position of a plurality of VOBUs located before and after the VOBU. Since the information is described, the DVD player can instantly jump the playback position to a desired position. This means that the DVD video data is ROM data and the target VO being processed at the time of authoring.
VOBU whose processing order is later than BU (hereinafter referred to as future VOB
U. This is because it was possible to know the position information of ()). The VOBU is composed of one or more GOPs (data units for which random access is performed). Hereinafter, the VOBU will be described as a GOP for convenience of explanation.

[0003]

However, in recent years, DVD
A system for recording AV data (audio video data) in real time, such as a recorder or an HDD recorder, has become widespread. In this case, position information of future data (data located after data currently recorded) is written. Is impossible. When all data is recorded at a fixed rate (CBR), writing of this position information is possible, 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 on future data, such as that recorded on a Navipack.

As a method of dubbing a digital signal once recorded in the HDD, a method of dubbing by returning digital data to analog data or a method of dubbing in the signal form (digital form) can be considered. It is desirable to reduce the amount of information or convert the signal form according to the capacity of the medium. There has been a demand for a method for recording position information of future data corresponding to a DVD video navi pack even in a real-time recording device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a recording / reproducing method and a recording / reproducing apparatus which can record AV data at a variable rate so as to enable special reproduction. The purpose is to:

Another object of the present invention is to provide a recording / reproducing method and a recording / reproducing apparatus capable of, when dubbing AV data, making the information amount of the AV data correspond to the capacity of the recording medium of the dubbing destination. With the goal.

[0007]

According to a first aspect of the present invention, there is provided a recording / reproducing method, comprising: a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded; A recording / reproducing method for reading data and performing a recording / reproducing process of the read data, comprising: a reading step of reading the first MPEG data from the first recording medium; and a reading first MPEG data. An information obtaining step of obtaining position information indicating positions of data groups before and after the specific data group of the first MPEG data based on the first and second MPEG data; And a recording step of recording the second MPEG data on a second recording medium. It is characterized in that comprises a.

According to a second aspect of the present invention, there is provided a recording / reproducing method comprising:
A recording / reproducing method for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group, and performing a recording / reproducing process of the read data, A reading step of reading the first MPEG data from the first recording medium, a decoding step of decoding the read first MPEG data to generate a decoded signal, and transmitting the decoded signal to the first MPEG data. Re-encoding to generate second MPEG data by re-encoding so that the amount of information is smaller than the above, and a recording step of recording the second MPEG data on a second recording medium. Is what you do.

According to a third aspect of the present invention, there is provided a recording / reproducing method comprising:
A recording / reproducing method for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group, and performing a recording / reproducing process of the read data, A reading step of reading the first MPEG data from the first recording medium, a decoding step of decoding the read first MPEG data to generate a decoded signal, and transmitting the decoded signal to the first MPEG data. Re-encoding to generate second MPEG data by re-encoding so that the amount of information is smaller than that of the second MPEG data.
An information obtaining step of obtaining position information indicating positions of data groups before and after the specific data group of the MPEG data, and adding the position information to the determined position of the second MPEG data to obtain a third data. An information adding step of generating MPEG data, and the third MPE
Recording the G data on a second recording medium.

According to a fourth aspect of the present invention, there is provided a recording / reproducing method comprising:
4. The recording / reproducing method according to claim 3, wherein the information obtaining step includes a step of recording the second MPEG data on a third recording medium, and a step of recording the second MPEG data from the third recording medium.
Reading the MPEG data, and obtaining, based on the read second MPEG data, position information indicating positions of data groups before and after the specific data group of the second MPEG data. It is characterized by the following.

[0011] The recording / reproducing method according to claim 5 of the present invention comprises:
3. The recording / reproducing method according to claim 2, wherein fixed-rate MPEG data is recorded as the first MPEG data on the first recording medium, and the re-encoding step includes the fixed-rate MPEG data. The variable rate MPEG data is generated as the second MPEG data by re-encoding the decoded signal corresponding to the data.

According to a sixth aspect of the present invention, there is provided a recording / reproducing method comprising:
4. The recording / reproducing method according to claim 3, wherein the first recording medium has fixed-rate MPEG data recorded as the first MPEG data, and the re-encoding step comprises: The variable-length MPEG data is generated as the second MPEG data by re-encoding the decoded signal corresponding to the MPEG data.

According to a seventh aspect of the present invention, there is provided a recording / reproducing method comprising:
7. The recording / reproducing method according to claim 6, wherein the information acquiring step includes a step of recording variable-rate MPEG data as the second MPEG data on a third recording medium, and the step of recording the variable-rate MPEG data from the third recording medium. And reading the MPEG data of the variable rate
Obtaining position information indicating positions of data groups before and after the specific data group of the variable-rate MPEG data based on the PEG data.

[0014] The recording / reproducing method according to claim 8 of the present invention comprises:
3. The recording and reproducing method according to claim 2, wherein the re-encoding step has a predetermined resolution.
Converting a decoded signal corresponding to the data into a signal having a resolution lower than the resolution, and re-encoding the converted signal to generate the second MPEG data. Is what you do.

According to a ninth aspect of the present invention, there is provided a recording / reproducing method comprising:
4. The recording and reproducing method according to claim 3, wherein the re-encoding step has a predetermined resolution.
Converting a decoded signal corresponding to the data into a signal having a resolution lower than the resolution, and re-encoding the converted signal to generate the second MPEG data. Is what you do.

According to a tenth aspect of the present invention, there is provided a recording / reproducing method according to the eighth or ninth aspect, wherein
A decoded signal corresponding to the first MPEG data is a high-definition signal, and a signal generated by converting the resolution of the decoded signal is a standard signal.

In a preferred embodiment of the present invention, the information obtaining step includes the step of recording the second MPEG data on a third recording medium. Reading the second MPEG data from the third recording medium; and reading the second MPEG data based on the read second MPEG data.
Determining position information indicating positions of data groups before and after the specific data group of the data.

According to a twelfth aspect of the present invention, there is provided a recording / reproducing method for recording / reproducing MPEG data obtained by encoding a video signal according to an MPEG encoding method, wherein predetermined data units are divided into one data group. A playback method, comprising: a first M corresponding to one or more data groups;
A storage step of reading the PEG data from the first recording medium and storing the data in the data storage unit; a reading step of reading the first MPEG data from the data storage unit; First M
An information acquisition step of acquiring position information indicating positions of data groups before and after a specific data group of PEG data, and transmitting the position information to the first MPEG.
An information adding step of adding the data to a predetermined position to generate second MPEG data;
Recording the data on a second recording medium.

A recording and reproducing method according to a thirteenth aspect of the present invention is the recording and reproducing method according to any one of the first, second, and third aspects, wherein the video signal is encoded by an MPEG encoding method to generate video data. Simultaneously encoding an audio signal to generate audio data; multiplexing the audio data and video data to generate the first MPEG data; and encoding the first MPEG data into the first MPEG data. And a pre-processing recording step of recording on one recording medium.

According to a fourteenth aspect of the present invention, in the recording / reproducing method according to any one of the first, third, and twelfth aspects, the information adding step is performed before and after the specific data group. The position information indicating the position of the data group is added to the vicinity of the head of the specific data group.

According to a fifteenth aspect of the present invention, in the recording / reproducing method according to any one of the first, second, third and twelfth aspects, the reading step includes the step of:
EG data is read out at a higher speed than a real-time playback speed for decoding and displaying the first MPEG data.
The recording step is characterized in that the second MPEG data is written to the second recording medium at a higher speed than a real-time reproduction speed for decoding and displaying the second MPEG data. is there.

According to a sixteenth aspect of the present invention, in the recording and reproducing method according to the second or third aspect, the decoding step includes decoding only video data included in the first MPEG data. Generating a decoded video signal, wherein the re-encoding step re-encodes the decoded video signal to generate re-encoded video data, and converts the re-encoded video data into the first MPEG data. Multiplexed data is generated by multiplexing the included audio data with delayed audio data that has been delayed, and the recording step includes recording the multiplexed data as the second MPEG data. Things.

According to a seventeenth aspect of the present invention, in the recording / reproducing method according to the second or third aspect, the re-encoding step includes the step of external audio data obtained by encoding an external audio signal. With the second MPE
Data insertion processing for inserting into the G data, data replacement processing for replacing the external audio data with audio data in the second MPEG data, or data synthesis processing for synthesizing the external audio data with audio data in the second MPEG data , Which performs any one of data processing.

The recording and reproducing method according to claim 18 of the present invention is the recording and reproducing method according to any one of claims 1, 2, 3, and 12, wherein the MPEG data is MPEG1,
It is characterized by being coded data conforming to the MPEG2, MPEG4 or MPEG7 standard.

A recording and reproducing method according to a nineteenth aspect of the present invention is the recording and reproducing method according to any one of the first, second and third aspects, wherein the first and second MPEG data are a transport stream or a program. It is characterized by being a stream.

According to a twentieth aspect of the present invention, in the recording / reproducing method according to any one of the first, second, third and twelfth aspects, the data group includes one or a plurality of access during reproduction. It is characterized by being constituted by a GOP as a unit.

According to a twenty-first aspect of the present invention, there is provided a recording / reproducing method according to any one of the first, second, third and twelfth aspects, wherein the first and second recording media are a hard disk and an optical disk. , A magneto-optical disk, a semiconductor memory, or a magnetic tape.

[0028] The recording and reproducing method according to claim 22 of the present invention is the recording and reproducing method according to any one of claims 1, 2, 3, and 12, wherein the first recording medium and the second recording medium are:
It is characterized by being the same data recording medium.

According to a twenty-third aspect of the present invention, there is provided a recording / reproducing apparatus for reading and reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded. A recording / reproducing apparatus for performing a recording / reproducing process of the read data, comprising: reading means for reading out the first MPEG data from the first recording medium; and reading out the first MPEG data based on the read first MPEG data. Information obtaining means for obtaining position information indicating positions of data groups before and after a specific data group of one MPEG data, and adding the position information to a predetermined position of the first MPEG data to obtain a second data; MPEG
Information adding means for generating data, and the second MPEG
Recording means for recording data on a second recording medium.

According to a twenty-fourth aspect of the present invention, there is provided a recording / reproducing apparatus for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded. A recording / reproducing apparatus for performing a recording / reproducing process of the read data, a reading means for reading the first MPEG data from the first recording medium, and a decoding signal for decoding the read first MPEG data. Decoding means for generating, and re-encoding means for re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data;
Recording means for recording the second MPEG data on a second recording medium.

A recording / reproducing apparatus according to a twenty-fifth aspect of the present invention reads and reads data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded. A recording / reproducing apparatus for performing a recording / reproducing process of the read data, a reading means for reading the first MPEG data from the first recording medium, and a decoding signal for decoding the read first MPEG data. Decoding means for generating, and re-encoding means for re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data;
Based on the second MPEG data, the second MPE
Information obtaining means for obtaining position information indicating positions of data groups before and after the specific data group of the G data, and adding the position information to a determined position of the second MPEG data to obtain a third MPEG An information adding means for generating data and a recording means for recording the third MPEG data on a second recording medium are provided.

A recording / reproducing apparatus according to a twenty-sixth aspect of the present invention is a recording / reproducing apparatus for recording and reproducing MPEG data obtained by encoding a video signal by an MPEG encoding method, and corresponds to one or more data groups. First MPE
A memory unit for storing G data; reading means for reading first MPEG data from the memory unit; and, based on the read first MPEG data, before and after a specific data group of the first MPEG data. Information acquisition means for acquiring position information indicating the position of the data group; information addition means for adding the position information to a determined position of the first MPEG data to generate second MPEG data; Recording means for recording the second MPEG data on a second recording medium.

A recording medium according to a twenty-seventh aspect of the present invention provides a second MP generated by the recording / reproducing method according to the first aspect.
A recording medium storing EG data, wherein the second M
The PEG data is characterized in that a predetermined data unit is divided into one data group, and has a data structure including position information indicating positions of data groups before and after the specific data group.

A personal computer according to a twenty-eighth aspect of the present invention reads out data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded. A personal computer for performing data processing for recording and reproducing the data 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. Information acquisition processing for obtaining position information indicating positions of data groups before and after a specific data group of the first MPEG data based on the MPEG data of the first MPEG data;
The method includes an information adding process of generating the second MPEG data by adding the position information to a determined position of the PEG data, and a recording process of recording the second MPEG data on a second recording medium. It is characterized by the following.

A personal computer according to claim 29 of the present invention reads data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded. A personal computer that performs data processing for recording and reproducing the data 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. A decoding process of decoding the MPEG data to generate a decoded signal, and a re-encoding process of re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data. And recording processing for recording the second MPEG data on a second recording medium. .

A personal computer according to claim 30 of the present invention reads and reads data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded. A personal computer that performs data processing for recording and reproducing the data 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. A decoding process of decoding the MPEG data to generate a decoded signal, and a re-encoding process of re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data. , Based on the second MPEG data, before and after the specific data group of the second MPEG data Third MP adds the information acquisition process of obtaining position information indicating the position of the over data group, the position information on the determined position of said second MPEG data
Information addition processing for generating EG data, and the third MP
And recording processing for recording the EG data on the second recording medium.

A personal computer according to a thirty-first aspect of the present invention is provided with a memory unit for holding MPEG data obtained by encoding a video signal by an MPEG encoding method and dividing predetermined data units into one data group. And data processing for recording and reproducing the MPEG data,
A personal computer which is performed by software, wherein the data processing includes storing processing for storing first MPEG data corresponding to one or more data groups in a memory unit, and reading and reading the first MPEG data from the memory unit. Processing, and information acquisition processing for acquiring, based on the read first MPEG data, position information indicating positions of data groups before and after the specific data group of the first MPEG data, and the position information Is added to a predetermined position of the first MPEG data,
Information addition processing for generating MPEG data of
And recording processing for recording the MPEG data on a second recording medium.

A recording and reproducing program according to a thirty-second aspect of the present invention reads data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded. A recording / reproducing program for recording / reproducing processing for recording / reproducing the read data by a computer, comprising: a reading step of reading the first MPEG data from the first recording medium; Based on the MPEG data,
An information obtaining step of obtaining position information indicating positions of data groups before and after the specific data group of the first MPEG data; and adding the position information to a determined position of the first MPEG data. Second MP
An information adding step of generating EG data and a recording step of recording the second MPEG data on a second recording medium are included.

According to a third aspect of the present invention, there is provided a recording / reproducing program for reading and reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded. A recording / reproducing program for recording / reproducing processing for recording / reproducing the read data by a computer, comprising: a reading step of reading out the first MPEG data from the first recording medium; A decoding step of decoding data to generate a decoded signal; a re-encoding step of re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; Recording the second MPEG data on a second recording medium.

A recording and reproducing program according to a thirty-fourth aspect of the present invention reads and reads data from a first recording medium on which first MPEG data in which a predetermined data unit is divided into one data group is recorded. A recording / reproducing program for recording / reproducing processing for recording / reproducing the read data by a computer, comprising: a reading step of reading out the first MPEG data from the first recording medium; A decoding step of decoding data to generate a decoded signal; a re-encoding step of re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; Based on the second MPEG data, for a specific data group of the second MPEG data,
An information obtaining step of obtaining position information indicating positions of data groups before and after the third MPEG data; and adding the position information to a determined position of the second MPEG data to obtain a third MPEG data.
An information adding step of generating data, and the third MP
Recording the EG data on a second recording medium.

A recording / reproducing program according to claim 35 of the present invention is a recording / reproducing apparatus for recording / reproducing MPEG data obtained by encoding a video signal according to the MPEG encoding method, wherein predetermined data units are divided into one data group. A recording / reproducing program for performing a process by a computer, a storage step of storing first MPEG data corresponding to one or more data groups in a data storage unit, and reading the first MPEG data from the data storage unit A reading step; an information obtaining step of obtaining, based on the read first MPEG data, position information indicating positions of data groups before and after the specific data group of the first MPEG data; Information is added to a predetermined position of the first MPEG data to obtain a second MPE. And information adding step of generating data, and characterized by comprising a recording step of recording the second MPEG data into the second recording medium.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIGS. 1 and 3 are block diagrams for explaining a recording / reproducing method according to Embodiment 1 of the present invention. FIG. 1 shows the 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 reproduced by the reproducing means 10 into the HDD 8.
And reproduces the MPEG stream (AV data). The MPEG stream includes various types such as a transport stream, a program stream, and an elementary stream. The analysis means 30 analyzes the position of each GOP on the MPEG stream,
The positional relationship between a predetermined GOP and GOPs before and after the predetermined GOP is recognized. 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. This memory means 19 may be a semiconductor memory or a recording medium such as an HDD. The MPEG stream to which the navigation information has been added is recorded by the recording means 7 on the optical disk 9 as the second recording medium. Here, the predetermined GOP to which the navigation information is added is MPEG
All GOPs included in the stream are set. However, the GOP to which the navigation information is added may be selected from all the GOPs included in the MPEG stream based on a certain standard.

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

Next, the recording / reproducing method according to the first embodiment 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 the recording / reproducing apparatus according to Embodiment 1 of the present invention.

The video signal input from the terminal 20 is A / D converted by the A / D converter 1 and sent to the video encoder 2 via the switch S1, and the video encoded data output from the video encoder 2 is output to the system encoder. Sent to 5.

The audio signal input from the terminal 21 is A / D converted by the A / D converter 3 and sent to the audio encoder 4 via the switch S2. The audio encoded data output from the audio encoder 4 is output from the switch S3. Is sent to the system encoding means 5 through

The video data and the audio data are multiplexed by the system encoding means 5, and the MPE obtained by the multiplexing is obtained.
The G data is sent to the switches S4 and S6.
The signal that has 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 needed.

A 1394 signal is input from the terminal 22,
The signal 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 as the first recording medium or the optical disk 9 as the second recording medium. A reproduced signal read out from the HDD 8 as the first recording medium or the optical disk 9 as the second recording medium by the reproducing means 10 and reproduced is converted into a video decoding means 11, an audio decoding means 12, an audio delaying means. 13, is supplied to the analysis means 30, the switch S4, the switch S5, and the switch S6.

The video signal decoded by the video decoding means 11 is supplied to the switch S1 and the DA conversion means 14
And output to a terminal 23 as a reproduced video signal. The audio signal decoded by the audio decoding unit 12 is supplied to the switch S2, is input to the DA conversion unit 15, and is 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 input to the 1394 I / F means 17, and is output to the terminal 25 in the 1394 format. At this time, CP
U18 controls the entire operation of the recording / reproducing apparatus.

Here, a case where signals from the terminals 20 and 21 are recorded at a variable rate will be considered. A signal is generated by the above-described recording system, that is, the above-described means 1 to 7. At this time,
In the navigation information adding means 6, the GOPs before and after the predetermined GOP
Although it is necessary to add OP position information, the amount of data to be recorded in the future cannot be predicted by real-time recording.
The position information of the preceding and following GOPs cannot be added. Therefore,
The data input to the navigation information adding means 6 is
The position information of P is sent to the recording means 7 without being added, converted into a recording signal, and recorded on the HDD 8.

FIG. 2 is a schematic diagram showing a stream conforming to the DVD video standard. In a DVD, as described above, one or a plurality of GOPs constitutes a data unit called VOBU, but in the present invention, VOBU will be described as a GOP for convenience. At the beginning of each GOP, information called a navi-pack is added, and position information indicating the positions of the GOPs located before and after the GOP is written therein so as to be useful during special playback or the like. I have. The DVD player implements special reproduction such as high-speed reproduction based on the position information.

Since the data recorded on the HDD 8 lacks the position information of the preceding and succeeding GOPs shown by diagonal lines in FIG. 2, the normal DVD player cannot guarantee the reproduction operation. However, by reading the already recorded data from the HDD 8 again, it is possible to know the position information of the previous and next GOPs. In order to add the position information thus obtained, the recording / reproducing apparatus shown in FIG. 1 performs the following operation.

GOP of data recorded in HDD 8
The following processing is performed so that the CPU 18 can detect the position information. For example, data reproduction (data reading) for a predetermined section of data recorded on the HDD 8 is executed, and the analyzing unit 30 analyzes the reproduced data (read data), or the recording unit 7 records the data on the HDD 8. Then, a process of recording the GOP position information in a predetermined position of the HDD 8 and storing the information is performed.

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

In the recording / reproducing apparatus according to the first embodiment, the above-mentioned units may be configured by hardware, or the processes by the 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, and position information indicating the position of the GOP before and after each GOP is added to the MPEG stream. Since the MPEG stream to which the position information is added is recorded on the optical disc 9, it is possible to record the MPEG data at a variable rate so that special reproduction is possible.

(Second Embodiment) Next, as a second embodiment, a recording / reproducing method for converting a code rate of data itself recorded first on an HDD will be described. For example, data of a fixed rate (CBR) of 9 Mbps is recorded on the HDD 8. To keep this data permanent,
When dubbing on the optical disc 9, it is assumed that the data is converted into data of a variable rate (VBR) of 3 Mbps and recorded in order to enable recording for a longer time.

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

Here, the navigation information adding means 6 still has
Future GOP for which the corresponding VBR data has not been input
Since the position information of the V
Navigation information cannot be added to BR data. Therefore, when VBR data is recorded on the HDD 8, each G
The position information of the OP is recorded in a storage area of the semiconductor memory that can be controlled by the CPU 18 or the HDD 8 in a storage area different from the storage area of the VBR data. Then, after the CBR data is re-encoded so that the code rate is converted from 9 Mbps to 3 Mbps, the reproduction unit 10 re-encodes the HDD.
8 to read out the 3 Mbps VBR data. Further, the read VBR data is supplied to the navigation information adding means 6 via the switch S4, and the navigation information adding means 6 adds navigation information including the position information of the GOPs before and after each GOP to the VBR data. I do. The VBR data to which the navigation information is added is recorded on the optical disk 9 via the switch S5 and the recording means 7.

As described above, according to the recording / reproducing method according to the second embodiment of the present invention, the C
The BR data 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 GOPs before and after each GOP for each GOP is added to the data, and the VBR data to which the position information is added is recorded on the optical disc 9, the amount of information of the MPEG data can be reduced when dubbing the MPEG data. MPEG data with a reduced amount of information can be recorded so that special reproduction is possible.

In the second embodiment, when the navigation information is added to each GOP, the re-encoded 3 Mbps VB
Although the case where the R data is temporarily recorded in the HDD 8 has been described, the present invention is not limited to this. For example, the navigation information adding means 6
May be provided 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 future GOP described above can be easily known, and the position information can be added to the VBR data almost in real time. In this case, G
The 3 Mbps VBR data to which the position information of the OP is added is recorded on the optical disk 9 via the recording means 7.

In this case, however, the position information of the GOPs before and after each GOP added to each GOP is a GOP within a range corresponding to the data amount of the VBR data stored in the memory means 19.
It is limited to the position information of the OP. Specifically, when the memory unit 19 is a 256-Mbit DRAM, the navigation information adding unit 6 sets each GOP of 3 Mbps VBR data.
, It is possible to know the position information of a future GOP separated by about 80 seconds.

(Embodiment 3) Next, as Embodiment 3, a description will be given of a recording / reproducing method in which data initially recorded on the HDD is a digital broadcast signal and the rate is converted. The digital broadcast signal is input to the 1394 I / F unit 16 in the form of an MPEG transport stream (TS data) from the terminal 22 in the 1394 format, and the TS data is transmitted to the HDD 8 via the switch S5 and the recording unit 7.
Will be recorded. That is, a transport stream in MPEG is recorded on the HDD 8 as CBR data, and this stream does not include navigation information.

In the third embodiment, the CBR
In order to record data on the optical disc 9 for a long time,
The CBR data is converted to VBR data, and further converted to VBR.
The navigation information is added to the 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, except that the video decoding unit 11 decodes the CBR data, and the video encoding unit 2 decodes the CBR data. Is converted to VBR data by re-encoding, and the system encoding means 5 converts the program stream (P) into AV data (MPEG data).
S).

The method of adding navigation information to this program stream is the same as in the second embodiment. This allows the data format to be converted from the TS data to the PS data at the same time as the code rate conversion.

According to the recording / reproducing method according to the third embodiment of the present invention, the rate conversion processing for converting the AV data recorded on the HDD 8 from CBR data to VBR data by re-encoding the data is performed, and Is subjected to stream format conversion processing for converting TS data into PS data, and the AV data having the converted code rate and stream format are converted into G data before and after each GOP.
Since the position information of the OP is added and the AV data to which the position information is added is recorded on the optical disc 9, the AV data (MP
When dubbing EG data), it is possible to reduce the amount of information of the MPEG data, convert the data format, and perform special reproduction of the AV data with the reduced amount of information and the converted data format. Can be recorded.

(Embodiment 4) Next, as Embodiment 4, a description will be given of a recording / reproducing method in which data initially recorded on an HDD is an HD digital broadcast signal and its code rate is converted. In the fourth embodiment, the video decoding means 11 decodes CBR TS data corresponding to a high-definition signal (HD signal) and converts the decoded data corresponding to the HD signal to a standard signal (SD signal). Embodiment 3 in that it has a function of converting (downconverting) the data to be converted
Is different.

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

As described above, according to the recording / reproducing method according to the fourth embodiment of the present invention, the rate at which the AV data corresponding to the HD signal recorded on HDD 8 is converted from CBR data to VBR data by re-encoding the AV data. In addition to performing the conversion process, the AV data is further down-converted to convert the data corresponding to the HD signal into the data corresponding to the SD signal. Since the position information of the GOPs before and after the GOP is added to the GOP and the AV data to which the position information is added is recorded on the optical disc 9, A
When dubbing V data (MPEG data), the MP
The information amount of the EG data can be reduced, and the definition can be converted. In addition, the AV data with the reduced information amount and the converted definition can be recorded so as to enable special reproduction.

(Embodiment 5) Next, a recording / reproducing method according to Embodiment 5 of the present invention will be described. In the recording / reproducing method according to the fifth embodiment, when the re-encoding of the audio data is unnecessary, only the re-encoding of the video data is performed. Here, the operation of re-encoding the video data and adding the position information of the GOP is the same as that of the second embodiment, and thus the description is omitted.
When converting the code rate of audio data or converting the encoding method, re-encoding is required, and the following re-encoding is performed.

The audio data output from the reproducing means 10 is decoded by the audio decoding means 12 and input to the audio coding means 4 via the switch S2 as decoded audio data. The decoded audio data input to the means 4 is re-encoded and input as re-encoded audio data to the system encoding means 5 via the switch S3. 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 it is not necessary to re-encode the audio data, the output of the reproducing means 10 is delayed by the delay means 13 and input to the system encoding means 5 via the switch S3 as delayed audio data. In the means 5, the delayed audio data and the 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 the AV data recorded on the HDD 8 is re-encoded, The audio data included in the AV data is not re-encoded, and the audio data read from the HDD 8 is delayed and multiplexed with the re-encoded video data. 9, the sound quality can be prevented from deteriorating due to re-encoding of the audio signal during dubbing.

The process of re-encoding the video data and the process of adding navigation information to the AV data (MPEG data) are performed in the same manner as in the second embodiment. The data can be converted into data that can be trick-played with a reduced amount of information.

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

First, a post-recording process of the recording / reproducing method according to the sixth embodiment will be described. Here, the post-recording processing is performed by the viewer by using the terminal 2 of the recording / reproducing apparatus (see FIG. 1).
It is assumed that recording is performed in accordance with the displayed video based on the reproduced video signal from the third video signal.

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

The audio encoding means 4 encodes the digital audio signal, and the audio data obtained by the encoding processing is input to the system encoding means 5 via the switch S3. The system encoder means 5
Then, the audio data is multiplexed with the re-encoded video data, and the multiplexed data is output to the navigation information adding means 6 as AV data. This AV data is recorded on the optical disc 9 with the navigation information added thereto, as in the second embodiment. In the post-recording process, the audio data of the MPEG data recorded on the HDD 8 is replaced with the post-recording audio data input from the outside.

Next, audio multiplexing processing of the recording / reproducing method according to the sixth embodiment will be described. Here, in the audio multiplexing process, it is assumed that the original audio data and external post-record audio data are time-division multiplexed. The audio signal input from the outside is converted into a digital audio signal by the AD conversion means 3 and input to the audio coding means 4 via the switch S2, similarly to the post-recording processing. In the means 4, encoding processing of the digital audio signal is performed, and audio data (after-recording audio data) obtained by the encoding processing is performed.
Is output to the switch S3.

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

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

In the audio multiplexing process, after-recording audio data input from the outside is inserted into the MPEG data recorded on the HDD 8, and
The MPEG data recorded in the file contains two audio streams.

As described above, according to the recording / reproducing method according to the sixth embodiment of the present invention, the MPE recorded on HDD 8
At the time of re-encoding the G data, processing for replacing the original audio data included in the MPEG data with external audio data or processing for inserting external audio data into the MPEG data is performed. Becomes possible.

In the sixth embodiment, when the MPEG data is re-encoded, the original audio data included in the MPEG data is replaced with external audio data, or the external audio data is added to the MPEG data. Has been described, but when the MPEG data is re-encoded, a process of combining the original audio data included in the MPEG data with the external audio data may be performed.

(Embodiment 7) Next, a recording and 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 almost in real time. FIG. 4 shows an MPEG recording / reproducing method according to the seventh embodiment.
FIG. 2 is a block diagram illustrating a schematic configuration of a recording / reproducing device that records data.

The recording / reproducing apparatus of the seventh embodiment is similar to that of FIG.
STB (Set-Top Box) 3 for receiving digital broadcast signals in addition to the configuration of the recording / reproducing apparatus of the first embodiment shown in FIG.
1. Encoder 3 for encoding analog video signals
2. a distribution data receiving unit 33 for receiving AV data such as MPEG data distributed via a computer network such as the Internet;
1, an encoder 32, and a switch S7 for selecting and outputting any output data of the distribution data receiving unit. 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 is provided with the means 1 to 5 and the switches S1 to S1 in the recording / reproducing apparatus shown in FIG. This corresponds to S3. 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, the recorded MPE
As a source of the G stream (MPEG data), an STB (Set-Top Box) 31 for receiving a digital broadcast signal is used.
Output data, output data of an encoder 32 that encodes an analog video signal, or M distributed via a computer network such as the Internet.
Output data of the distribution data receiving unit 33 that receives PEG data may be considered.

In the switch S7, any one of the output data of the STB 31, the encoder 32, and the distribution data receiving unit is selected, and M is supplied as output data from each unit.
The PEG stream is sent to the navigation information adding means 6 and the analyzing means 3
Input to 0.

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 in the recording / reproducing apparatus of the first embodiment shown in FIG. However, in the seventh embodiment,
This embodiment differs from the first embodiment in that a series of processes such as the addition of navigation information and the analysis of MPEG data need 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 the data in the memory means 19 which the means 6 has as a work area. In the analysis means 30,
For the data stored in the memory means 19,
Position information detection processing for detecting the position information of each GOP is performed. In the navigation information adding means 6, each GOP is set based on the position information obtained by the analyzing means 30.
Position information indicating the positions of the GOPs before and after the
A process for adding to the MPEG data is performed. However, in this case, the position information of the GOPs before and after that 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 unit 19.

As described above, according to the recording / reproducing method of the seventh embodiment, when a digital broadcast signal or distribution data on the Internet is received and recorded as MPEG data,
Alternatively, an external analog video signal is encoded and
When recording as EG data, 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 the MPEG data is recorded, each MPEG data is stored in the MPEG data. , The process of adding the position information of the GOPs before and after that 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 according to the eighth embodiment, during high-speed dubbing of AV data such as MPEG data, addition of navigation information, conversion of a code rate, conversion of a signal format, and the like are performed.

The data recorded on the recording medium HDD 8 is usually read at a real-time reproduction speed in order to decode and display the data. However, when the decoding display processing is not performed on the data or the decoding display is performed intermittently, the reading of the data from the HDD 8 can be performed at a speed higher than the real time reproduction speed.

Therefore, the recording / reproducing apparatus of the eighth embodiment performs H
DD8 (see FIG. 1) (first M
PEG data) at the highest transfer rate of the HDD 8, and performs data processing such as addition of navigation information, conversion of a code rate, and conversion of a signal form in each of the above-described embodiments at a speed higher than a real-time playback speed. A with the above data processing
The V data (second or third MPEG data) is recorded on the optical disk 9 (see FIG. 1) at a speed higher than the real-time reproduction 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, at the time of dubbing in which ordinary decoding and display processing is not performed, the data recorded on the HDD 8 is read at a higher speed than the real-time reproducing speed. Therefore, while performing high-speed dubbing of MPEG data, it is possible to add navigation information to the MPEG data, convert a code rate, and convert a signal form.

For example, if the HDD 8 has a maximum transfer rate of 20 Mbps and the normal reproduction speed of the AV data recorded on the HDD 8 is 5 Mbps, the AV data is dubbed at a speed of about 4 × while For, add the above navigation information, convert the code rate,
Data processing such as conversion of signal form can be performed.

In the eighth embodiment, the case where high-speed dubbing is performed by the recording / reproducing apparatus has been described. However, at the time of the high-speed dubbing process, data read out from the HDD (reproduced data) or recorded on an optical disk is used. The data (recorded data) to be transmitted may be transmitted to a STB or the like in a 1394 format as a recorded signal or a reproduced signal.

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

Further, in each of the above embodiments, the HDD and the optical disk have been described as examples of the recording medium, but 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 data recorded on the HDD includes SD signal, HD signal, CB
Although the R data, the VBR data, and the MPEG data (TS or PS) are shown, the data recorded in the HDD may be digital data such as elementary data and DVC (digital video camera).

Also, the MPEG described in each of the above embodiments
The data is, specifically, MPEG1, MPEG2, MP
Needless to say, it complies with all MPEG standards such as EG4 and MPEG7. Further, the first, second, or third recording medium in the above embodiment may be a separate recording medium or may be the same recording medium.

Further, in each of the above embodiments, the recording and reproducing apparatus is realized by hardware, but these apparatuses may be realized by software. In this case, the recording / reproducing program for performing the recording / reproducing process described in each of the above embodiments is recorded on a data storage medium such as a floppy (registered trademark) disk, so that the recording / reproducing apparatus can be operated by an independent computer. It can be built in a system.

FIG. 5 is a diagram for explaining a case where the recording / reproducing processing of each of the above embodiments is performed by a computer system using a floppy disk storing the recording / reproducing program. FIG. 5A shows an external appearance, a sectional structure, and a floppy disk main body viewed from the front of the floppy disk, and FIG. 5B shows an example of a physical format of the floppy disk main body.

The floppy disk FD is formed by attaching the floppy disk body D to a floppy disk case FC.
A plurality of tracks Tr are formed concentrically from the outer circumference to the inner circumference on the surface of the floppy disk main body D, and each track Tr is divided into 16 sectors Se in the angular direction. Has been split. Therefore, in the floppy disk FD storing the above program,
The floppy disk main body D has data as the program recorded in an area (sector) Se allocated thereon.

FIG. 5C shows a floppy disk F
4 shows a configuration for recording the above-mentioned program to D and performing recording and reproduction processing by software. When recording the above program on the floppy disk FD, a computer system (personal computer)
The data as the above program is transferred from Cs to the floppy disk FD via the floppy disk drive FD.
Write to. When the recording / reproducing apparatus is constructed in the computer system Cs by the program recorded on the floppy disk FD, the program is stored on the floppy disk drive FDD.
D and read 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 and from recording media such as HDDs, optical disks, and memories can be processed by software.

In the description of FIG. 5, a description has been given using a floppy disk as a data storage medium. However, even when an optical disk is used, recording and reproducing processing by software can be performed similarly to the case of the floppy disk. Further, the data storage medium is not limited to the above-mentioned optical disk or floppy disk, but may be any type of IC card, ROM cassette, etc., as long as it can record a program. The recording / reproducing processing by software can be performed as in the case of using a floppy disk or the like.

[0111]

As described above, claims 1 and 1 of the present invention are provided.
According to the recording / reproducing method according to 3, 18, 19, the first M unit in which a predetermined data unit is divided as one data group.
A recording / reproducing method for reading data from a first recording medium on which PEG data is recorded, and performing a recording / reproducing process on the read data, wherein the first MPEG data is read from the first recording medium. Reading the first MPEG data based on the read step and the read first MPEG data.
An information obtaining step for obtaining position information indicating positions of data groups before and after the specific data group of the PEG data; and adding the position information to a determined position of the first MPEG data to obtain a second MPEG Since the method includes an information adding step of generating data, and a recording step of recording the second MPEG data on a second recording medium, the MPEG data can be reproduced at a variable rate, at a high speed, or at the beginning. Can be recorded so that the special reproduction can be performed.

According to the recording / reproducing method according to the second, thirteenth, eighteenth and nineteenth aspects of the present invention, the first recording in which the first MPEG data obtained by dividing a predetermined data unit into one data group is recorded. A recording / reproducing method for reading data from a medium and performing recording / reproducing processing of the read data, comprising: a reading step of reading the first MPEG data from the first recording medium;
A decoding step of decoding the EG data to generate a decoded signal, and a re-encoding step of re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; , The second MPEG
Recording the data on the second recording medium, so that when dubbing the MPEG data, the information amount of the MPEG data is made to correspond to the capacity of the recording medium of the dubbing destination. be able to.

According to the recording / reproducing method according to the third, thirteenth, eighteenth, and nineteenth aspects of the present invention, the first recording in which the first MPEG data obtained by dividing the predetermined data unit into one data group is recorded. A recording / reproducing method for reading data from a medium and performing a recording / reproducing process on the read data, comprising: a reading step of reading the first MPEG data from the first recording medium;
A decoding step of decoding the EG data to generate a decoded signal; a re-encoding step of re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; , The second MPEG
An information obtaining step for obtaining position information indicating positions of data groups before and after the specific data group of the second MPEG data based on the data; The method includes an information adding step of adding information to generate third MPEG data, and a recording step of recording the third MPEG data on a second recording medium.
When dubbing MPEG data, the MPEG data can be recorded at a variable rate so that special reproduction such as high-speed reproduction and heading can be performed.
The information amount of data can be made to correspond to the capacity of the recording medium at the dubbing destination.

[0114] According to a recording / reproducing method according to a fourth aspect of the present invention, in the recording / reproducing method according to the third aspect, the information acquiring step is a step of recording the second MPEG data on a third recording medium. Reading the second MPEG data from the third recording medium; and reading the second MPEG data based on the read second MPEG data.
Determining the position information indicating the position of the data group before and after the specific data group of the G data, so that the position information indicating the position of the GOP before and after the GOP for each GOP is easily obtained. be able to.

According to a recording / reproducing method according to a fifth aspect of the present invention, in the recording / reproducing method according to the second aspect, the first method is used.
Has fixed rate MPEG data as the first MPEG data, and the re-encoding step is performed by re-encoding a decoded signal corresponding to the fixed rate MPEG data. Rate MPE
G data is generated as the second MPEG data.
G data can be converted from a fixed rate to a variable rate.

According to a recording / reproducing method according to a sixth aspect of the present invention, in the recording / reproducing method according to the third aspect, the first recording medium includes, as the first MPEG data,
The fixed-rate MPEG data is recorded, and the re-encoding step is performed by re-encoding a decoded signal corresponding to the fixed-rate MPEG data to obtain a variable-rate MPEG data.
EG data is generated as the second MPEG data.
While converting the EG data from a fixed rate to a variable rate, the converted MPEG data can include GOP position information required for special reproduction.

According to a recording / reproducing method according to a seventh aspect of the present invention, in the recording / reproducing method according to the sixth aspect, the information obtaining step includes the step of using variable-rate MPEG data as the second MPEG data. Recording on a recording medium; and reading the variable rate MP from the third recording medium.
Reading the EG data, and, based on the read variable-rate MPEG data,
Determining the position information indicating the position of the data group before and after the specific data group of the G data, so that the position information indicating the position of the GOP before and after the GOP for each GOP is easily obtained. be able to.

According to the recording / reproducing method according to claim 8 of the present invention, in the recording / reproducing method according to claim 2, the re-encoding step has a predetermined resolution.
Converting a decoded signal corresponding to the PEG data into a signal having a resolution lower than the resolution, and re-encoding the converted signal to generate the second MPEG data. Therefore, it is possible to convert the MPEG data from a signal having a predetermined resolution to a signal having a lower resolution than the resolution and dubbing.

According to a ninth aspect of the present invention, in the recording and reproducing method of the third aspect, the re-encoding step has a predetermined resolution.
Converting a decoded signal corresponding to the PEG data into a signal having a resolution lower than the resolution, and re-encoding the converted signal to generate the second MPEG data. Therefore, while converting the MPEG data from a signal having a predetermined resolution to a signal having a resolution lower than the resolution, the converted MPEG data is converted into a G signal required for special reproduction.
The location information of the OP may be included.

According to the recording / reproducing method according to claim 10 of the present invention, in the recording / reproducing method according to claim 8 or 9, the decoded signal corresponding to the first MPEG data is a high-definition signal. Since the signal generated by converting the resolution of the signal is a standard signal, MP
EG data can be converted from a high-definition signal to a standard signal and dubbed.

According to the recording / reproducing method according to claim 11 of the present invention, in the recording / reproducing method according to claim 9, the information acquiring step is a step of recording the second MPEG data on a third recording medium. Reading the second MPEG data from the third recording medium; and reading the second MPEG data based on the read second MPEG data.
Determining the position information indicating the positions of the data groups before and after the specific data group of the EG data, so that the position information indicating the positions of the preceding and succeeding GOPs with respect to each GOP is easily obtained. be able to.

According to the recording / reproducing method according to the twelfth and eighteenth aspects of the present invention, MPEG data obtained by encoding a video signal by the MPEG encoding method and having a predetermined data unit divided into one data group, A recording / reproducing method for recording / reproducing, comprising: a storage step of storing first MPEG data corresponding to one or more data groups in a data storage unit; a reading step of reading the first MPEG data from the data storage unit; First MPE read
An information obtaining step of obtaining position information indicating positions of data groups before and after the specific data group of the first MPEG data based on the G data; and determining the position information as the first MPEG data. And a recording step of recording the second MPEG data on a second recording medium. The method further comprises the steps of: In addition, GOP position information required for special reproduction can be added and recorded almost in real time.

According to a recording / reproducing method according to claim 14 of the present invention, in the recording / reproducing method according to any one of claims 1, 3, and 12, the information adding step comprises: Since position information indicating the positions of the preceding and following data groups is added to the vicinity of the head of the specific data group,
There is an effect that MPEG data can be reproduced even by a VD player.

According to a recording / reproducing method according to a fifteenth aspect of the present invention, in the recording / reproducing method according to any one of the first, second, third, and twelfth aspects, the reading step includes the step of reading the first MPEG data. The first MPEG data is read out at a higher speed than the real-time playback speed for decoding and displaying the first MPEG data, and the recording step displays the second MPEG data by decoding the second MPEG data normally. It is characterized in that the data is written to the second recording medium at a speed higher than the real-time playback speed, so that data processing such as addition of position information to the MPEG data, code rate conversion and signal form conversion can be performed at a high speed dubbing of the MPEG data. Can be done during

According to a recording / reproducing method according to claim 16 of the present invention, in the recording / reproducing method according to claim 2 or 3, the decoding step decodes only video data contained in the first MPEG data. Wherein the re-encoding step re-encodes the decoded video signal to generate re-encoded video data, and converts the re-encoded video data to the first MPEG data. Multiplexing the multiplexed data with delayed audio data obtained by delaying audio data included in the data to generate multiplexed data, wherein the recording step records the multiplexed data as the second MPEG data. Therefore, it is possible to prevent sound quality deterioration due to re-encoding of the audio signal.

According to a recording / reproducing method according to claim 17 of the present invention, in the recording / reproducing method according to claim 2 or 3, the re-encoding step comprises the steps of: The audio data is stored in the second MP
Data insertion processing for inserting into the EG data, data replacement processing for replacing the external audio data with audio data in the second MPEG data, or data synthesis processing for synthesizing the external audio data with audio data in the second MPEG data Since any one of the data processing is performed, there is an effect that dubbing can be performed during dubbing.

According to a recording / reproducing method according to a twentieth aspect of the present invention, in the recording / reproducing method according to any one of the first, second, third, and twelfth aspects, the data group may include one or more data groups. In addition, when dubbing AV data divided into VOBUs composed of one or more GOPs corresponding to the DVD video format, the addition of navigation information and the amount of information are performed. Can be reduced.

According to a recording / reproducing method according to claim 21 of the present invention, in the recording / reproducing method according to any one of claims 1, 2, 3, and 12, the first and second recording media are:
Since it is one of a hard disk, an optical disk, a magneto-optical disk, a semiconductor memory, and a magnetic tape, dubbing of AV data depends on the type of the recording medium on which the AV data is recorded or the dubbing destination of the AV data. This can be performed with almost no restriction on the type of recording medium.

According to a recording / reproducing method according to claim 22 of the present invention, in the recording / reproducing method according to any one of claims 1, 2, 3, and 12, the first recording medium and the second recording medium are Since the same data recording medium is used, the number of recording media mounted on the recording / reproducing apparatus can be reduced.

According to the recording / reproducing apparatus according to claim 23 of the present invention, data is read from the first recording medium on which the first MPEG data in which a predetermined data unit is divided into one data group is recorded. What is claimed is: 1. A recording / reproducing apparatus for performing recording / reproducing processing of read data, comprising: reading means for reading the first MPEG data from the first recording medium; and Information obtaining means for obtaining position information indicating positions of data groups before and after the specific data group of the first MPEG data; and adding the position information to a determined position of the first MPEG data. Second MP
Information adding means for generating EG data, and the second MP
Since the recording means for recording the EG data on the second recording medium is provided, there is an effect that the MPEG data can be recorded at a variable rate so that special reproduction such as high-speed reproduction or heading can be performed.

According to the recording / reproducing apparatus according to the twenty-fourth aspect of the present invention, data is read from the first recording medium on which the first MPEG data in which a predetermined data unit is divided as one data group is recorded. What is claimed is: 1. A recording / reproducing apparatus for performing recording / reproducing processing of read data, comprising: reading means for reading said first MPEG data from said first recording medium; and decoding by decoding said read first MPEG data. Decoding means for generating a signal; re-encoding means for re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; And a recording means for recording the MPE on the second recording medium.
When dubbing G data, there is an effect that the information amount of MPEG data can be made to correspond to the capacity of the recording medium of the dubbing destination.

According to the recording / reproducing apparatus according to the twenty-fifth aspect of the present invention, data is read from the first recording medium on which the first MPEG data in which a predetermined data unit is divided into one data group is recorded. What is claimed is: 1. A recording / reproducing apparatus for performing recording / reproducing processing of read data, comprising: reading means for reading said first MPEG data from said first recording medium; and decoding by decoding said read first MPEG data. Decoding means for generating a signal; re-encoding means for re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; Based on the second M
Information obtaining means for obtaining position information indicating positions of data groups before and after a specific data group of PEG data, and adding the position information to a determined position of the second MPEG data to obtain a third MPEG The apparatus further comprises an information adding means for generating data and a recording means for recording the third MPEG data on a second recording medium.
The EG data can be recorded at a variable rate so that special reproduction is possible, and the information amount of the MPEG data can be made to correspond to the capacity of the recording medium of the dubbing destination.

According to the recording / reproducing apparatus according to claim 26 of the present invention, there is provided a recording / reproducing apparatus for recording / reproducing MPEG data obtained by encoding a video signal according to the MPEG encoding method, wherein the video signal comprises The corresponding first M
A memory for storing PEG data, reading means for reading the first MPEG data from the memory, and a first MPEG data based on the read first MPEG data;
Information acquisition means for acquiring position information indicating positions of data groups before and after the specific data group of the data, and adding the position information to a predetermined position of the first MPEG data to obtain a second MPEG An information adding unit for generating data; and a recording unit for recording the second MPEG data on a second recording medium.
There is an effect that data can be recorded almost in real time by adding the GOP position information required for special reproduction.

According to the recording medium of claim 27 of the present invention, the second medium generated by the recording and reproducing method of claim 1 is provided.
Wherein the second MPEG data is divided into a predetermined data unit as one data group, and position information indicating positions of data groups before and after the specific data group with respect to a specific data group. Since it has a data structure including the data structure, dubbed MPEG data can be specially reproduced.

According to the personal computer of the twenty-eighth aspect of the present invention, the data is read from the first recording medium on which the first MPEG data obtained by dividing the predetermined data unit into one data group is recorded. A personal computer which performs data processing for recording and reproducing the output data by software, wherein the data processing includes a read processing for reading the first MPEG data from the first recording medium, and a read processing for reading the first MPEG data from the first recording medium. First MPE
Information acquisition processing for obtaining position information indicating positions of data groups before and after a specific data group of the first MPEG data based on the G data;
And a recording process for recording the second MPEG data on a second recording medium by adding the position information to the determined position of the MPEG data to generate second MPEG data. Therefore, processing for recording MPEG data at a variable rate so as to enable special reproduction can be performed by software.

According to the personal computer of the present invention, the data is read from the first recording medium in which the first MPEG data in which the predetermined data unit is divided into one data group is recorded, and the data is read. A personal computer for performing data processing for recording and reproducing the output data by software, wherein the data processing includes reading processing for reading the first MPEG data from the first recording medium, and reading the read MPEG data. 1 MPE
A decoding process of decoding G data to generate a decoded signal, and a re-encoding process of re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data. And recording processing for recording the second MPEG data on a second recording medium.
The processing for performing the information amount of the PEG data according to the capacity of the recording medium of the dubbing destination can be realized by software.

According to the personal computer of the present invention, the data is read from the first recording medium in which the first MPEG data in which the predetermined data unit is divided as one data group is recorded. A personal computer for performing data processing for recording and reproducing the output data by software, wherein the data processing includes reading processing for reading the first MPEG data from the first recording medium, and reading the read MPEG data. 1 MPE
A decoding process of decoding G data to generate a decoded signal, and a re-encoding process of re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data. Information acquisition processing for obtaining position information indicating positions of data groups before and after a specific data group of the second MPEG data based on the second MPEG data, and determining the second MPEG data And a recording process of recording the third MPEG data on a second recording medium, the information adding process of generating third MPEG data by adding the position information to the determined position. Therefore, the dubbing process of the MPEG data by software is performed so that the MPEG data is recorded at a variable rate so that the special reproduction can be performed. The information amount of EG data can be a process of converting in accordance with the capacity of the dubbing destination recording medium.

According to the personal computer of the thirty-first aspect of the present invention, a memory unit for holding MPEG data obtained by encoding a video signal by an MPEG encoding method and dividing predetermined data units into one data group. Wherein the data processing for recording and reproducing the MPEG data is performed by software, and the data processing is a storage processing for storing first MPEG data corresponding to one or more data groups in a memory unit. Reading processing for reading out the first MPEG data from the memory unit; and, based on the read out first MPEG data, determining the positions of the data groups before and after the specific data group of the first MPEG data. Information acquisition processing for acquiring position information indicating the first MP. It is characterized by including an information adding process of generating second MPEG data by adding it to a determined position of G data, and a recording process of recording the second MPEG data on a second recording medium. So MP
The process of recording the EG data almost in real time by adding the position information of the GOP necessary for the special reproduction can be realized by software.

According to the recording / reproducing program according to claim 32 of the present invention, data is read from a first recording medium on which first MPEG data in which a predetermined data unit is divided into one data group is recorded. A recording / reproducing program for performing, by a computer, a recording / reproducing process for recording / reproducing the read data, comprising: a reading step of reading the first MPEG data from the first recording medium; An information obtaining step of obtaining position information indicating positions of data groups before and after a specific data group of the first MPEG data based on the first MPEG data;
The position information is added to the determined position of the data and the second
And a recording step of recording the second MPEG data on a second recording medium, so that the MPEG data can be reproduced at a variable rate and specially reproduced. Can be performed by software.

According to the recording / reproducing program according to claim 33 of the present invention, data is read from the first recording medium on which the first MPEG data in which a predetermined data unit is divided into one data group is recorded. A recording / reproducing program for performing, by a computer, a recording / reproducing process for recording / reproducing the read data, comprising: a read step of reading the first MPEG data from the first recording medium; Decoding the MPEG data to generate a decoded signal, and re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data And a recording step of recording the second MPEG data on a second recording medium. Dubbing over data, information amount of MPEG data, the processing performed to be the one corresponding to the capacity of the dubbing destination recording medium can be realized by software.

According to the recording / reproducing program according to claim 34 of the present invention, data is read from a first recording medium on which first MPEG data in which a predetermined data unit is divided into one data group is recorded. A recording / reproducing program for performing, by a computer, a recording / reproducing process for recording / reproducing the read data, comprising: a read step of reading the first MPEG data from the first recording medium; Decoding the MPEG data to generate a decoded signal, and re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data And, based on the second MPEG data, before and after a specific data group of the second MPEG data An information obtaining step of obtaining position information indicating a position of the data group; an information adding step of adding the position information to a determined position of the second MPEG data to generate third MPEG data; Recording the MPEG data on the second recording medium, so that the dubbing processing of the MPEG data by software is performed so that the MPEG data can be recorded at a variable rate and special reproduction is possible. Then, the information amount of the MPEG data can be converted according to the capacity of the recording medium at the dubbing destination.

A recording / reproducing program according to claim 35 of the present invention is a recording / reproducing program for recording / reproducing MPEG data obtained by encoding a video signal according to the MPEG encoding method and divided into predetermined data units as one data group. A recording / reproducing program for performing a process by a computer, a storage step of storing first MPEG data corresponding to one or more data groups in a data storage unit, and reading the first MPEG data from the data storage unit A reading step; an information obtaining step of obtaining, based on the read first MPEG data, position information indicating positions of data groups before and after the specific data group of the first MPEG data; The information is added to a predetermined position of the first MPEG data and the second MPEG data is added. And information adding step of generating data, since; and a recording step of recording the second MPEG data to the second recording medium, MP
The process of recording the EG data almost in real time by adding the position information of the GOP necessary for the special reproduction can be realized by software.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a detailed configuration of a recording / reproducing apparatus according to each embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating the configuration of a stream.

FIG. 3 is a block diagram showing a schematic configuration of a recording / reproducing apparatus according to Embodiment 1 of the present invention.

FIG. 4 is a block diagram illustrating a schematic configuration of a recording / reproducing apparatus according to a seventh embodiment of the present invention.

FIG. 5 illustrates a data storage medium (FIGS. (A) and (b)) storing a program for performing a recording / reproducing process according to each of the embodiments by a computer system, and the computer system (FIG. (C)). FIG.

[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 9 Optical disk 10 Playing means 11 Video decoding means 12 Audio decoding means 13 Audio delay means 14 , 15 DA conversion means 16, 17 1394 IF means 18 CPU 19 Memory means 20, 21, 22 Terminal 23, 24, 25 Terminal 30 Analysis means 31 STB 32 Encoder 33 Data receiving unit S1-S7 Switch Cs Computer system FD Floppy disk

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H04N 5/7826 H04N 5/85 A 5/783 Z 5/85 5/907 B 5/91 P 5/907 5/92 H 5/92 5/93 Z 5/93 5/782 Z F term (reference) 5C018 HA01 NA01 5C052 AA01 AA04 AA17 AB03 AB04 AB05 AB09 AC01 CC06 CC11 DD04 GA07 GB06 GB09 GC05 GD01 GF05 5C053 FA15 FA21 FA23 FA24 FA27 GB28 GB37 HA21 KA08 LA11 5D044 AB07 BC04 CC06 DE25 DE40 DE43 EF03 EF05 EF06 EF07 FG23 GK02 GK08 GK10 GK12 HL07

Claims (35)

[Claims] 1. A recording / reproducing device for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group, and performing a recording / reproducing process of the read data. A reading step of reading the first MPEG data from the first recording medium; and a step of reading the first MPEG data based on the read first MPEG data.
An information obtaining step of obtaining position information indicating positions of data groups before and after the specific data group of the MPEG data, and adding the position information to the determined position of the first MPEG data, A recording / reproducing method, comprising: an information adding step of generating MPEG data; and a recording step of recording the second MPEG data on a second recording medium. 2. A recording / reproducing device for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group, and performing a recording / reproducing process of the read data. A reading step of reading the first MPEG data from the first recording medium; a decoding step of decoding the read first MPEG data to generate a decoded signal; A re-encoding step of re-encoding so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; and a recording step of recording the second MPEG data on a second recording medium. A recording / reproducing method comprising: 3. A recording / reproducing device for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group, and performing a recording / reproducing process of the read data. A reading step of reading the first MPEG data from the first recording medium; a decoding step of decoding the read first MPEG data to generate a decoded signal; A re-encoding step of re-encoding so that the information amount is smaller than that of the first MPEG data to generate second MPEG data; and a second MPE based on the second MPEG data.
An information obtaining step of obtaining position information indicating positions of data groups before and after the specific data group of the G data; and adding the position information to a determined position of the second MPEG data to obtain a third MPEG data. A recording / reproducing method, comprising: an information adding step of generating data; and a recording step of recording the third MPEG data on a second recording medium. 4. The recording / reproducing method according to claim 3, wherein the information acquiring step comprises: a step of recording the second MPEG data on a third recording medium; and a step of recording the second MPEG data from the third recording medium. Reading MPEG data; and obtaining position information indicating positions of data groups before and after the specific data group of the second MPEG data based on the read second MPEG data. Characteristic recording / reproducing method. 5. The recording / reproducing method according to claim 2, wherein the first recording medium has fixed-rate MPEG data recorded as the first MPEG data. A recording / reproducing method for generating variable-rate MPEG data as the second MPEG data by re-encoding a decoded signal corresponding to the fixed-rate MPEG data. 6. The recording / reproducing method according to claim 3, wherein fixed-rate MPEG data is recorded as the first MPEG data on the first recording medium. Recording / reproducing a method of generating variable-rate MPEG data as the second MPEG data by re-encoding a decoded signal corresponding to the fixed-rate MPEG data. 7. The recording / reproducing method according to claim 6, wherein the information obtaining step comprises: a step of obtaining a variable rate MPEG as the second MPEG data.
Recording data on a third recording medium; reading the variable rate MPEG data from the third recording medium; identifying the variable rate MPEG data based on the read variable rate MPEG data Obtaining position information indicating the positions of the data groups before and after the data group. 8. The recording / reproducing method according to claim 2, wherein the re-encoding step converts a decoded signal corresponding to the first MPEG data having a predetermined resolution into a signal having a lower resolution than the resolution. Converting the converted signal, re-encoding the converted signal to the second MP
Generating EG data. 9. The recording / reproducing method according to claim 3, wherein the re-encoding step converts a decoded signal corresponding to the first MPEG data having a predetermined resolution into a signal having a lower resolution than the resolution. Converting the converted signal, re-encoding the converted signal to the second MP
Generating EG data. 10. The recording / reproducing method according to claim 8, wherein a decoded signal corresponding to the first MPEG data is a high-definition signal, and a signal generated by converting the resolution of the decoded signal is a standard signal. A recording / reproducing method, characterized in that: 11. The recording / reproducing method according to claim 9, wherein the information acquiring step comprises: a step of recording the second MPEG data on a third recording medium; and a step of recording the second MPEG data from the third recording medium. Reading MPEG data; and obtaining position information indicating positions of data groups before and after the specific data group of the second MPEG data based on the read second MPEG data. Characteristic recording / reproducing method. 12. A recording / reproducing method for recording / reproducing MPEG data obtained by encoding a video signal according to the MPEG encoding method and dividing a predetermined data unit into one data group, comprising: at least one data group; Storing the first MPEG data corresponding to the first MPEG data in the data storage unit; reading the first MPEG data from the data storage unit; and reading the first MPEG data based on the read first MPEG data.
An information acquisition step of acquiring position information indicating positions of data groups before and after the specific data group of the MPEG data, and adding the position information to a predetermined position of the first MPEG data, A recording and reproducing method, comprising: an information adding step of generating MPEG data; and a recording step of recording the second MPEG data on a second recording medium. 13. The recording / reproducing method according to claim 1, wherein the video signal is encoded by an MPEG encoding method to generate video data, and at the same time, the audio signal is encoded to encode the audio data. An encoding step of creating; and multiplexing the audio data and the video data to form the first MP.
A recording / reproducing method, comprising: a multiplexing step of generating EG data; and a pre-processing recording step of recording the first MPEG data on the first recording medium. 14. The recording / reproducing method according to claim 1, wherein the information adding step includes: transmitting position information indicating positions of data groups before and after the specific data group with respect to the specific data group. A recording / reproducing method, which is added near a head of a specific data group. 15. The recording / reproducing method according to claim 1, wherein the reading step displays the first MPEG data by decoding the first MPEG data. Reading out the second MPEG data at a speed higher than a real-time playback speed for decoding and displaying the second MPEG data. A recording / reproducing method for writing to a recording medium. 16. The recording / reproducing method according to claim 2, wherein the decoding step includes decoding only video data included in the first MPEG data to generate a decoded video signal. The re-encoding step includes re-encoding the decoded video signal to generate re-encoded video data, and delaying the re-encoded video data by delaying audio data included in the first MPEG data. Multiplexed data to generate multiplexed data, and the recording step includes:
A recording / reproducing method for recording as G data. 17. The recording / reproducing method according to claim 2, wherein the re-encoding step inserts external audio data obtained by encoding an external audio signal into the second MPEG data. Data insertion processing, data replacement processing for replacing the external audio data with audio data in the second MPEG data, or data synthesis processing for synthesizing the external audio data with audio data in the second MPEG data. A recording / reproducing method for performing one type of data processing. 18. The recording / reproducing method according to claim 1, wherein the MPEG data is MPEG1, MPEG2, MP
A recording / reproducing method, which is coded data conforming to the EG4 or MPEG7 standard. 19. The recording / reproducing method according to claim 1, wherein the first and second MPEG data are a transport stream or a program stream. . 20. The recording / reproducing method according to claim 1, wherein the data group is constituted by one or a plurality of GOPs which are access units at the time of reproduction. Characteristic recording / reproducing method. 21. The recording / reproducing method according to claim 1, wherein the first and second recording media are a hard disk, an optical disk, a magneto-optical disk, a semiconductor memory, or a magnetic tape. Recording / reproducing method, characterized in that: 22. The recording / reproducing method according to claim 1, wherein the first recording medium and the second recording medium are the same data recording medium. Recording and playback method. 23. Recording / reproduction for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded, and performing recording / reproduction processing of the read data. A reading unit for reading the first MPEG data from the first recording medium; and a first unit for reading the first MPEG data based on the read first MPEG data.
Information obtaining means for obtaining position information indicating positions of data groups before and after the specific data group of the MPEG data, and adding the position information to the determined position of the first MPEG data, A recording / reproducing apparatus comprising: information adding means for generating MPEG data; and recording means for recording the second MPEG data on a second recording medium. 24. Recording / reproduction for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group is recorded, and performing recording / reproduction processing of the read data. A reading unit for reading the first MPEG data from the first recording medium; a decoding unit for decoding the read first MPEG data to generate a decoded signal; Re-encoding means for re-encoding so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; and recording means for recording the second MPEG data on a second recording medium. A recording / reproducing apparatus comprising: 25. Recording / reproduction for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group and recording / reproducing the read data. A reading unit for reading the first MPEG data from the first recording medium; a decoding unit for decoding the read first MPEG data to generate a decoded signal; Re-encoding means for re-encoding so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; and a second MPE based on the second MPEG data.
Information obtaining means for obtaining position information indicating positions of data groups before and after the specific data group of the G data, and adding the position information to a determined position of the second MPEG data to obtain a third MPEG A recording / reproducing apparatus comprising: an information adding unit for generating data; and a recording unit for recording the third MPEG data on a second recording medium. 26. A recording / reproducing apparatus for recording / reproducing MPEG data obtained by encoding a video signal by an MPEG encoding method, comprising: a memory unit for storing first MPEG data corresponding to one or more data groups; Reading means for reading out the first MPEG data from the memory unit; and reading the first MPEG data based on the read first MPEG data.
Information acquisition means for acquiring position information indicating positions of data groups before and after the specific data group of the MPEG data, and adding the position information to a predetermined position of the first MPEG data to obtain a second data. A recording / reproducing apparatus, comprising: information adding means for generating MPEG data; and recording means for recording the second MPEG data on a second recording medium. 27. A recording medium storing second MPEG data generated by the recording / reproducing method according to claim 1, wherein the second MPEG data is divided into predetermined data units as one data group. A recording medium having a data structure including position information indicating positions of data groups before and after a specific data group. 28. A data process for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group, and recording and reproducing the read data, A personal computer which is performed by software, wherein the data processing includes: a reading process of reading the first MPEG data from the first recording medium; and a first process based on the read first MPEG data.
An information obtaining process for obtaining position information indicating positions of data groups before and after the specific data group of the MPEG data, and adding the position information to the determined position of the first MPEG data, and A personal computer, comprising: an information adding process for generating MPEG data; and a recording process for recording the second MPEG data on a second recording medium. 29. A data process for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group, and recording and reproducing the read data, A personal computer performed by software, wherein the data processing includes a reading process of reading the first MPEG data from the first recording medium, and a decoding signal generated by decoding the read first MPEG data. A re-encoding process of generating the second MPEG data by re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data; And a recording process for recording on a recording medium. 30. A data process for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group, and recording and reproducing the read data, A personal computer performed by software, wherein the data processing includes a reading process of reading the first MPEG data from the first recording medium, and a decoding signal generated by decoding the read first MPEG data. A decoding process for generating the second MPEG data by re-encoding the decoded signal so that the information amount is smaller than that of the first MPEG data; and a decoding process based on the second MPEG data. , The second MPE
An information acquisition process for obtaining position information indicating positions of data groups before and after a specific data group of G data; and adding the position information to a determined position of the second MPEG data to obtain a third MPEG data. A personal computer comprising: an information adding process for generating data; and a recording process for recording the third MPEG data on a second recording medium. 31. A data processing apparatus comprising: a memory unit for storing MPEG data obtained by encoding a video signal according to an MPEG encoding method and dividing predetermined data units into one data group, and recording and reproducing the MPEG data. A personal computer that performs, by software, the data processing, the first MPEG data corresponding to one or more data groups is stored in a memory unit, and the first MPEG data is stored in the memory unit. A first reading process based on the read first MPEG data;
Information acquisition processing for acquiring position information indicating the positions of data groups before and after the specific data group of the MPEG data, and adding the position information to a predetermined position of the first MPEG data, A personal computer comprising: an information adding process for generating MPEG data; and a recording process for recording the second MPEG data on a second recording medium. 32. A recording / reproducing process for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group and recording / reproducing the read data. A read / write step for reading the first MPEG data from the first recording medium, wherein the first MPEG data is read based on the read first MPEG data.
An information obtaining step of obtaining position information indicating positions of data groups before and after the specific data group of the MPEG data, and adding the position information to the determined position of the first MPEG data, A recording / reproducing program, comprising: an information adding step of generating MPEG data; and a recording step of recording the second MPEG data on a second recording medium. 33. A recording / reproducing process for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group and recording / reproducing the read data. A read / write step for reading the first MPEG data from the first recording medium; and a decoding step for decoding the read first MPEG data to generate a decoded signal. Re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; and recording the second MPEG data in a second record. A recording step for recording on a medium. 34. A recording / reproducing process for reading data from a first recording medium on which first MPEG data obtained by dividing a predetermined data unit into one data group and recording / reproducing the read data. A read / write step for reading the first MPEG data from the first recording medium; and a decoding step for decoding the read first MPEG data to generate a decoded signal. Re-encoding the decoded signal so that the amount of information is smaller than that of the first MPEG data to generate second MPEG data; and re-encoding the decoded signal based on the second MPEG data. Second MPE
An information obtaining step of obtaining position information indicating positions of data groups before and after the specific data group of the G data; and adding the position information to a determined position of the second MPEG data to obtain a third MPEG data. A recording / reproducing program, comprising: an information adding step of generating data; and a recording step of recording the third MPEG data on a second recording medium. 35. A recording / reproducing program for performing, by a computer, a recording / reproducing process for recording / reproducing MPEG data obtained by encoding a video signal by an MPEG encoding method and obtained by dividing a predetermined data unit into one data group. A storage step of storing first MPEG data corresponding to one or more data groups in a data storage unit; a reading step of reading out the first MPEG data from the data storage unit; Based on the data, the first
An information acquisition step of acquiring position information indicating positions of data groups before and after the specific data group of the MPEG data, and adding the position information to a predetermined position of the first MPEG data, A recording / reproducing program, comprising: an information adding step of generating MPEG data; and a recording step of recording the second MPEG data on a second recording medium.