JP2001285800A - Data signal recording and reproducing device and data signal recording and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems that it is difficult to secure a real time property of the time of recording at the time of reproduction when reproducing recorded data and the using efficiency of a capacity lowers in the case that a recording medium is provided with the minimum recording unit of a fixed size. SOLUTION: Time information is superimposed when recording data and output is controlled by using the time information when the reproduction is performed. Also, the time information and additional data are added to the data and the difference between the data to be recorded and the minimum recording unit is absorbed. Or, the time information and the additional data are added to the data and recording is performed by a unit which is the integer multiple of the minimum recording unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an MPEG (Moving Pic)
apparatus and method for recording a compression-encoded video / audio signal such as a video / audio signal on a recording medium, and an apparatus and method for reproducing a compressed video / audio signal recorded on a recording medium. It is.

[0002]

2. Description of the Related Art As a method of recording a compression-encoded video signal on a recording medium, there is a recording method using a recording format shown in FIG. FIG. 11 is a schematic diagram of a method for recording a compressed moving image. In the figure, 201 is a track on a recording medium, and 202 is a plurality of sequences forming a track. The sequence 202 has a sequence header 203
And a plurality of GOPs (Group Of Pictures) 204. Reference numeral 205 denotes a sub-sequence header arranged for special reproduction.

[0003] The GOP 204 is the minimum unit that can be decoded as a moving image, and information necessary for reproduction is stored in a sequence header 203. As a result, a sequence 202, which is the minimum unit that can be reproduced, is constructed. Also, a sub-sequence header 205 having the same information as the sequence header 203 is arranged inside the sequence 202 at appropriate intervals.

[0004] In order to reproduce the sequence 202, information included in the sequence header 203 is required. For example, even if an attempt is made to reproduce from the middle of the sequence 202, by using the sub-sequence header 205, Can be reproduced from the middle without waiting for the beginning of the sequence 202, and as a result, reproduction over the sequence 202 in special reproduction or the like can be performed.

[0005]

However, in the recording / reproducing apparatus configured as described above, since it is assumed that the storage medium is originally reproduced, the recording / reproducing apparatus includes digital video / audio signals and the like based on the recording / reproducing method of the storage medium. When recording broadcast signals, these signals are recorded without time information. Furthermore, since the time reference for reproduction is not specified, the time required for recording does not always coincide with the time required for reproduction, and there is a problem that real-time performance is lost.

Further, since the size of the GOP 204 varies depending on the image, the size of the sequence 202 varies depending on the image as a result. For example, when recording is performed on a recording medium such as a hard disk in which the minimum data recording unit is fixed, Since there is a difference between a data amount to be recorded and a data recording unit, there is a problem that a capacity is wasted.

Further, even if the sub-sequence header 205 is arranged, if a data error occurs inside the GOP 204 due to recording / reproducing, there is a problem that the reproduction cannot be performed as a result. Further, even if the sequence header 203 and the sub-sequence header 205 are arranged, the start point of a new program and the break of the program cannot be recognized, and the start of the program and the search operation between programs and the program are performed. There was a problem that it was not possible.

Further, even if the sequence header 203 and the sub-sequence header 205 are arranged, a break in data can be recognized only in a sequence unit, and fast forward reproduction of a program cannot be performed precisely. There was a point. Further, recording of fixed pattern data and duplicated data contained in the sequence header 203, sub-sequence header 205, and GOP 204 increases the recording capacity, and consequently shortens the recording time. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a recording method and a reproducing apparatus capable of reproducing a moving image and a sound without losing real-time performance at the time of recording and reproducing. And It is another object of the present invention to provide a recording method and a reproducing apparatus having a high capacity utilization efficiency even when recording on a recording medium having a fixed minimum data recording unit such as a hard disk.

In addition, even when recording is performed on a recording medium having a fixed minimum data recording unit such as a hard disk, even when an error occurs in the data itself due to high capacity use efficiency and recording / reproducing, the error is corrected. It is an object of the present invention to obtain a recording method and a reproducing apparatus which enable continuous reproduction. Also, a recording method and a reproducing apparatus which have a high capacity utilization efficiency even when recording on a recording medium having a fixed minimum data recording unit such as a hard disk and which can easily perform special reproduction such as a program search at the time of reproduction. The purpose is to get.

Further, even when recording is performed on a recording medium having a fixed minimum data recording unit, such as a hard disk, a recording method which has a high capacity use efficiency and can easily perform special reproduction such as fast forward reproduction during reproduction. And a playback device. Another object of the present invention is to provide a recording method and a reproducing apparatus capable of further extending the recording time even when recording is performed on a recording medium having an upper limit in the recording capacity such as a hard disk.

[0012]

According to a first aspect of the present invention, there is provided a data signal recording / reproducing apparatus which adds time information to a received data signal comprising a digital video / audio signal, and a time stamp adding means for adding the time information. Recording means for recording the reproduced data signal on a recording medium, reproducing means for reproducing the data recorded on the recording medium, and the reproduced data signal,
A time stamp reading and removing means for outputting based on the time information added to the reproduced data signal and removing the time information from the output data signal.

The data signal recording / reproducing apparatus according to the second invention adds a dummy header to the data signal output from the time stamp adding means so that the data amount becomes equal to the data amount of the minimum recording unit of the recording medium. And a dummy header adding means.

According to a third aspect of the present invention, there is provided a data signal recording / reproducing apparatus, wherein each of the plurality of data signals output from the time stamp adding means is a recording unit formed by collecting a predetermined number of minimum recording units of a recording medium. And a block header adding means for adding a dummy header such that

A data signal recording / reproducing apparatus according to a fourth aspect is characterized in that the dummy header is error correction data for performing error correction on an input data signal.

According to a fifth aspect of the present invention, in the data signal recording / reproducing apparatus, the dummy header is data information indicating information on the data content of the input data signal.

According to a sixth aspect of the present invention, there is provided a data signal recording / reproducing apparatus for removing a fixed pattern unique to data from a data signal output from a time stamp adding means, and outputting the fixed pattern to the recording means; And a fixed pattern data reproducing means for adding the same pattern information as the fixed pattern removed by the fixed pattern removing means to the data signal reproduced from.

A data signal recording / reproducing apparatus according to a seventh aspect of the present invention includes a fixed pattern data removing means for removing, from a data signal output from the time stamp adding means, fixed pattern information which is unnecessary data information during reproduction. It is a thing.

According to an eighth aspect of the present invention, in the data signal recording / reproducing method, time information indicating a time interval at which the data signal is input is added to each data signal composed of the received digital video and audio signals, and the time information is added. Is recorded on a recording medium, and when reproducing and outputting the data signal recorded on the recording medium, the data signal is output at time intervals based on the time information.

According to a ninth aspect of the present invention, in the data signal recording / reproducing method, a dummy header is added to the data signal to which the time information is added so that the data amount becomes equal to the data amount of the minimum recording unit of the recording medium. This is for recording on a recording medium.

According to a tenth aspect of the present invention, in the data signal recording / reproducing method, each of the plurality of data signals output from the time stamp adding means is a recording unit comprising a predetermined minimum number of recording units of a recording medium. And a block header adding means for adding a dummy header such that

[0022]

Embodiments of the present invention will be described below. Embodiment 1 FIG. FIG. 1 shows a first embodiment of the present invention. In the figure, reference numeral 1 denotes an input digital video / audio signal comprising a data signal of a received digital broadcast or the like, 2 denotes a reference clock generator, and 3 denotes a time stamp generator. Reference numeral 4 denotes a reference time generating device, 5 denotes a time stamp adding device, 6 denotes a recording device, 7 denotes a recording medium such as a hard disk, 8 denotes a reproducing device, 9 denotes a time stamp removing device, and 10 denotes an output digital video / audio signal. The recording medium 7 is, for example, a disk-shaped recording medium such as a hard disk or a DVD,
Refers to a recording medium such as a tape. The lower part of FIG. 1 illustrates the format of data stored in the recording medium 7, that is, the output of the recording device 6. In the figure, reference numeral 11 denotes a sector, which is a minimum data recording unit of a recording medium. Reference numeral 12 denotes a packet constituting the sector 11, reference numeral 13 denotes a time stamp, and reference numeral 14 denotes a transport stream packet (hereinafter, referred to as a TS packet).

The TS packet 14 is a packet having a fixed length of 188 bytes specified by the MPEG-2 system (ISO / IEC 13818-1). It is used for transmission of various table information required at the time of. Except for a packet that transmits invalid data called a null packet, each TS packet 14 usually has any information thereof. Packet 12
Contains at least one or more of the TS packets 14 and a time stamp 13 of the TS packet 14. In the first embodiment, it is assumed that the packet 12 includes one TS packet 14 and the time stamp 13.

Next, the operation of the first embodiment will be described. The input digital video / audio signal 1 in FIG.
MPEG defined by SO / IEC13818-1
-2 transport stream. MP
The EG-2 transport stream is often used for broadcasting, and data is divided into fixed-size packets, so transmission is relatively easy. On the other hand, recording is not premised on recording and reproduction. When reproducing, some time reference is required.

The reference clock generator 2 generates a reference clock necessary for generating time information described below. The time stamp generating device 3 generates time information at the time of recording, that is, a time stamp 13, based on the reference clock generated by the reference clock generating device 2. The time stamp 13 represents, for example, the time when the transport stream packet of the input digital video / audio signal 1 arrives at the time stamp adding device 5. The time stamp adding device 5 multiplexes the input digital video / audio signal 1 with the time stamp 13 generated by the time stamp generating device 3. The recording device 6 records the output of the time stamp adding device 5 on the recording medium 7.

Here, the lower part of FIG. 1 shows the output of the recording device 6. The sector 11 indicates a minimum data recording unit of the recording medium, and is, for example, an IDE (Integrated Drive Elec).
In the case of a hard disk of the tronics type, it is fixed at 512 bytes. In the figure, a sector 11 is composed of two packets 12. Further, the packet 12 includes a time stamp 13 and a transport stream packet 1
4. Generally, the size of the transport stream packet 14 is 188 bytes.

In FIG. 1, a reference time generator 4 generates reference time information for reproduction based on the reference clock generated by the reference clock generator 2. The playback device 8
The recorded data is read from the recording medium 7 and transmitted to the time stamp removing device 9. The time stamp removing device 9 compares the time stamp 13 with the reference time information generated by the reference time generating device 4 and outputs only the transport stream packet 14 as the output digital video / audio signal 10 when they match, The latter MPEG
It is transmitted to a video / audio decoder circuit (not shown). Specifically, the data is output in accordance with the time information generated by the reference time generation device 4 based on time information indicating a time interval of each data.

As described above, the output digital video / audio signal 10
Is output at an appropriate time by comparing the reference time with the time stamp 13, so that the time interval at which the transport stream packet 14 arrives can be faithfully reproduced even during reproduction, so that real-time performance after recording and reproduction is improved. Will be kept.

As described above, when recording data on a recording medium, time information is superimposed as additional data on a data signal of a digital broadcast or the like input to the apparatus, and data is output according to the time information during reproduction. Therefore, even in the case of data of a format that is not premised on recording and reproduction, such as MPEG-2 transport stream, real-time performance can be ensured at the time of reproduction, and the time interval between transmitted data signals can be ensured. While maintaining such,
Reproduction can be performed.

In FIG. 1, a portion for generating a reference clock commonly used by the time stamp generating device 3 and the reference time generating device 4 is provided independently as the reference clock generating device 2. It may also be used as a clock generation device of a microprocessor (not shown) for controlling the recording device 6 and the reproducing device 8.

Embodiment 2 FIG. 2 shows a second embodiment of the present invention. In the figure, 21 is a dummy header adding device, 22 is a dummy header removing device, and the other components are the same as in the first embodiment. The lower part of FIG.
2 illustrates the format of data stored in the storage device 6, that is, the output of the recording device 6. In the figure, reference numeral 23 denotes a dummy header, reference numeral 24 denotes a packet constituting the sector 11, and the rest is the same as in the first embodiment.

Next, the operation of the second embodiment will be described. The dummy header adding device 21 forms a packet 24 by further superimposing the dummy header 23 on the transport stream packet 14 on which the time stamp 13 output from the time stamp adding device 5 is superimposed,
Recording is performed on the recording medium 7 by the recording device 6. In the present embodiment, the dummy header 23 is inserted between the time stamp 13 and the transport stream packet 14, but the insertion position is not particularly defined. Here, the superimposed dummy header 23 is removed from the output of the reproducing device 8 by the dummy header removing device 22.

Here, the lower part of FIG. 2 shows the output of the recording device 6. In the present embodiment, by adding the dummy header 23, the packet 24 composed of the time stamp 13, the dummy header 23, and the transport stream packet 14 has a half size of the sector 11, ie, 2 One packet 11 can constitute one sector 11. As described above, by adjusting the size of the packet 24 by the dummy header 23, data can be efficiently stored in the sector 11.

As described above, in this embodiment, when data is recorded on a recording medium, the difference between the amount of data to be recorded and the minimum data recording unit of the recording medium is absorbed by adding additional data. With this configuration, the data amount of the data to which the additional data is added can be made equal to the minimum data recording unit of the recording medium, and the use efficiency of the capacity of the recording medium can be improved. Also, since data recorded on the recording medium can be recorded so as to fit within the minimum recording unit of the recording medium, the data is not recorded over a plurality of minimum recording units, so that the data is reproduced. Access to data becomes easier.

Also, in the present embodiment, the role of the dummy header 23 is only data stuffing (adjusting the data size so that the size of each data is constant). It may be configured to store the indicated text information and the like.

Embodiment 3 FIG. FIG. 3 shows a third embodiment of the present invention. In the figure, 31 is a block header adding device, 32 is a block header removing device, and the other components are the same as in the first embodiment. The lower part of FIG. 3 illustrates the format of data stored in the recording medium 7, that is, the output of the recording device 6. In the figure, reference numeral 33 denotes a block composed of a plurality of sectors 11;
Are collected as a block. 34
Denotes a block header, and the rest is the same as in the first embodiment.

Next, the operation of the third embodiment will be described. The block header adding device 31 collects a plurality of TS packets 14 on which the time stamps 13 output from the time stamp adding device 5 are superimposed, that is, a plurality of packets 12, and forms a block 33. In the present embodiment, one block 33 is configured by collecting M packets 12. The block 33 is composed of a plurality of sectors 11 which are the minimum data recording unit of the recording medium 7. In the present embodiment, one block 33 is configured by collecting N sectors 11. Further, the recording device 6 records the block 33 output from the block header adding device 31 in the sector 11 of the recording medium 7.
If there is no convenient common multiple between the size of the packet 12 and the size of the sector 11, the data size can be adjusted by adding a block header 34. Here, the superposed block header 34 and the configured block 33 are removed from the output of the reproducing device 8 by the block header removing device 32.

As described above, the block 1 is a set of N sectors 11 and also a set of M packets 12. As described above, data is efficiently stored by performing recording in units of the block 33 including the sector 11 and the packet 12.

As described above, in the present embodiment, when recording data on a recording medium, a plurality of data are collected, and a dummy header (here, a block header) is added thereto, whereby the recording medium can be recorded. Is a recording unit composed of a plurality of predetermined minimum recording units, so that data can be efficiently recorded for each recording unit of the recording medium (for each block in which a plurality of sectors are collected). it can.

In this embodiment, the role of the block header 23 is only data stuffing. However, the block header 23 may be configured to store, for example, text information indicating a program title.

When an IDE hard disk is used as the recording medium 7, if the block 53 is formed by collecting 256 sectors, the size of the block 53 becomes equal to the maximum number of continuously accessible sectors. It is easier to make continuous access during playback. As described above, by selecting the value of N so that the data size that allows continuous access to the recording medium 7 and the size of the block 53 are equal, the performance during recording and reproduction can be improved.

Embodiment 4 FIG. 4 shows a fourth embodiment of the present invention. In the figure, reference numeral 41 denotes an error correction code adding device, reference numeral 42 denotes an error correction code removing device, and the other components are the same as those in the second embodiment. The lower part of FIG.
2 illustrates the format of data stored in the storage device 6, that is, the output of the recording device 6. In the figure, reference numeral 43 denotes an error correction code, reference numeral 44 denotes a packet including the error correction code 43, the time stamp 13, and the transport stream packet 14, and the other components are the same as those in the second embodiment.

Next, the operation of the fourth embodiment will be described. The error correction code adding device 41 adds an error correction code 43 such as a Reed-Solomon code to the transport stream packet 14 on which the time stamp 13 output from the time stamp adding device 5 is superimposed to form a packet 44. I do. In the present embodiment, two packets 44 are collected to form the sector 11, and the recording device 6 transfers the packet output from the error correction code adding device 41 to the recording medium 7.
Is recorded in sector 11. The error correction code 43 superimposed here is removed from the output of the reproduction device 8 by the error correction code elimination device 42. At this time, the time stamp 13 and the code error in the transport stream packet 14 caused by recording and reproduction are removed. Is corrected.

As described above, by adding the error correction code 43 before recording data on the recording medium 7,
It is possible to efficiently store data in the sector 11,
In addition, it is possible to obtain an output digital video / audio signal 10 with high reliability against a data error due to recording and reproduction.

As described above, in the present embodiment, when data is recorded on a recording medium, error correction information is simultaneously recorded as additional data, and at the time of reproduction, a data error is corrected according to the error correction information. In addition to improving the use efficiency of the capacity of a recording medium, even when a data error occurs due to recording and reproduction, the reliability of reproduced data is improved so that continuous moving images and audio can be reproduced.

Embodiment 5 FIG. FIG. 5 shows a fifth embodiment of the present invention, in which 51 is an error correction code adding device, 52 is an error correction code removing device, and the other components are the same as those of the third embodiment. The lower part of FIG. 5 illustrates the format of data stored in the recording medium 7, that is, the output of the recording device 6. In the figure, 53 is a block composed of a plurality of sectors 11, 54 is an error correction code, and the other is the same as the third embodiment.

Next, the operation of the fifth embodiment will be described. The error correction code adding device 51 includes a transport stream packet 14 on which the time stamp 13 output from the time stamp adding device 5 is superimposed, that is, a plurality of packets 12, and a block 5 from the error correction code 54.
Constituting No. 3. In this embodiment, one block 53 is formed from the M packets 12 and the error correction code 54 corresponding thereto.
Is composed. The block 53 is composed of a plurality of sectors 11 which are the minimum data recording unit of the recording medium 7. In the present embodiment, the block 53 is composed of N sectors 11, and the recording device 6 records the block 53 output from the error correction code adding device 51 in the sector 11 of the recording medium 7. The superimposed error correction code 54 and the constructed block 53 are removed from the output of the reproduction device 8 by the error correction code removal device 52. At this time, a code error in the block 53 caused by recording and reproduction is removed. Will be corrected.

As described above, the block 53 is a set of N sectors 11 and also a set of M packets 12. By performing recording in units of the block 53 composed of the sector 11 and the packet 12 as described above, data can be efficiently stored, and the output digital video / audio signal with high reliability against a data error due to recording / reproducing. 10 can be obtained.

As described above, in this embodiment, when data is recorded on a recording medium, a plurality of data are collected and added with a dummy header (here, the dummy header is a block header). By performing the above, the data size can be adjusted so that the data amount becomes equal to the recording unit obtained by collecting a plurality of minimum data recording units of the recording medium, and the use efficiency of the capacity of the recording medium can be improved. Further, since the block header is used as the data of the error correction information, even if a data error occurs during reproduction, the data error can be corrected according to the error correction information, and the reliability of the reproduced data is improved. Reproduction of moving images and sounds can be performed.

Embodiment 6 FIG. FIG. 6 shows a sixth embodiment of the present invention. In the figure, reference numeral 61 denotes a data start code adding device for adding a data start code indicating a start position of data, which is one of data information relating to data to be recorded; 62, a data start code removing device; Is the same as The lower part of FIG. 6 illustrates the format of data stored in the recording medium 7, that is, the output of the recording device 6. In the figure, reference numeral 63 denotes a data start code, 64 denotes a packet composed of a data start code 63, a time stamp 13, and a transport stream packet 14, and the rest is the same as in the second embodiment.

Next, the operation of the sixth embodiment will be described. The data start code adding device 61 forms a packet 64 by adding a data start code 63 to the transport stream packet 14 on which the time stamp 13 output from the time stamp adding device 5 is superimposed. The packet 64 output from the data start code adding device 61 is recorded in the sector 11 of the recording medium 7 by the device 6. Here, the data start code 63 has information indicating that the contents of the transport stream packet 14 have changed. For example, when the transport stream packet 14 is transmitting a program including a moving image and audio, it indicates that the program has newly started, or stores a chapter number in the program. The superimposed data start code 63 is used for searching for a data read start point when the reproducing device 8 reads data from the recording medium 7. Finally, the data start code 63 is
It is removed from the output of the reproducing device 8 by the data start code removing device 62.

As described above, by adding the data start code 63 before recording data on the recording medium 7, data can be efficiently stored in the sector 11 and data can be read out during reproduction. The start point can be searched, and special reproduction such as the search for the beginning of a program or a search operation for an arbitrary position can be performed.

As described above, in this embodiment, when data is recorded on a recording medium, a data start code is simultaneously recorded as additional data, and at the time of reproduction, a reproduction start position is determined based on the data start code. With this configuration, the use efficiency of the capacity of the recording medium can be improved, and the start position of the recorded data can be known, so that special reproduction such as program search can be performed.

Embodiment 7 FIG. FIG. 7 shows a seventh embodiment of the present invention. In the figure, reference numeral 71 denotes a data start code adding device for adding a data start code indicating a data start position, which is one of data information regarding data to be recorded, 72 denotes a data start code removing device, and The same is true. The lower part of FIG. 7 illustrates the format of data stored in the recording medium 7, that is, the output of the recording device 6. In the figure, 73 indicates a plurality of sectors 11
, A data start code 74 is the same as that of the third embodiment.

Next, the operation of the seventh embodiment will be described. The data start code adding device 71 forms a block 73 from the transport stream packet 14 on which the time stamp 13 output from the time stamp adding device 5 is superimposed, that is, a plurality of packets 12, and the data start code 74. In this embodiment, M packets 12
Are collected to form one block 73. The block 73 includes a plurality of sectors 11 which are the minimum data recording unit of the recording medium 7. In the present embodiment, N blocks 11 are collected to form one block 73, and the recording device 6 records the block 73 output from the data start code adding device 71 in the sector 11 of the recording medium 7. The data start code 74 has information indicating that the content of the block 73 has changed.

For example, when the transport stream packet 14 is transmitting a program composed of a moving image and a sound, it indicates that the program has newly started, or stores a chapter number in the program. . The superimposed data start code 74 is used for searching for a data read start point when the reproducing device 8 reads data from the recording medium 7. Finally, the data start code 74 and the constructed block 73 are stored in the data start code removing device 7.
2 removes it from the output of the playback device 8.

As described above, the block 73 is a set of N sectors 11 and also a set of M packets 12. By performing recording in units of the block 73 composed of the sector 11 and the packet 12 as described above, it is possible to efficiently store data, and to search for a data reading start point during reproduction,
It is possible to perform special reproduction, such as locating a program or searching for an arbitrary portion.

As described above, in this embodiment, when data is recorded on a recording medium, the data is recorded by adding a dummy header (here, the dummy header is a data start code) to a plurality of collected data. By performing the above, the data size can be adjusted so that the data amount becomes equal to the recording unit obtained by collecting a plurality of minimum data recording units of the recording medium, and the use efficiency of the capacity of the recording medium can be improved. Further, at the time of data reproduction, the reproduction start position of each data recorded on the recording medium is determined based on the data start code, so that special reproduction such as program search can be performed.

Embodiment 8 FIG. FIG. 8 shows an eighth embodiment of the present invention. In the figure, reference numeral 81 denotes a data content display code adding device for adding a data content display code which is one of data content information relating to data to be recorded. 82
Denotes a data content display code removing device, and the other components are the same as in the second embodiment. The lower part of FIG. 8 illustrates the format of data stored in the recording medium 7, that is, the output of the recording device 6. In the figure, 83 is a data content display code,
Reference numeral 84 denotes a packet composed of a data content display code 83, a time stamp 13, and a transport stream packet 14, and the rest is the same as in the second embodiment.

Next, the operation of the eighth embodiment will be described. The data content display code adding device 81 adds a data content display code 83 to the transport stream packet 14 on which the time stamp 13 output from the time stamp adding device 5 is superimposed, forms a packet 84, and records the packet 84. The device 6 records the packet 84 output from the data content display code adding device 81 in the sector 11 of the recording medium 7. Here, the data content display code 83 has information on the content of the data transmitted in the transport stream packet 14.

For example, when the transport stream packet 14 transmits a moving image compressed and encoded in accordance with the MPEG standard, the attribute of the image is shown.
According to the MPEG standard, compression-encoded images are classified into the following three attributes. The first is an I picture using predictive coding inside an image, and can reproduce one image alone during reproduction. The second is a P picture that has been predictively coded from a past image, and requires past image information during reproduction. The third is a B picture that is predictively coded from a past image and a future image, and requires past and future image information during reproduction. In the present embodiment, the data content display code 83 is the transport stream packet 14
Indicates which of the three attributes has image data. Data content display code 8 superimposed here
Reference numeral 3 is used when the reproducing device 8 reads data from the recording medium 7, for example, when reading only the packet 84 having I-picture image data. Finally, the data content display code 83 is the data content display code removal device 8
2 removes it from the output of the playback device 8.

As described above, by adding the data content display code 83 before recording data on the recording medium 7, the data can be efficiently stored in the sector 11, and the reproducing device 8 can be used during reproduction. By selectively reading out only the packet 84 having the image data of the I picture, special reproduction such as fast-forward reproduction can be performed.

As described above, in the present embodiment, when data is recorded on the recording medium, the data content indication code is simultaneously recorded as additional data for each data, thereby reducing the data capacity of the recorded data. Since the recording unit is set to be equal to the minimum recording unit, the use efficiency of the recording medium can be improved. Also, at the time of reproduction, the reproduction data is selected based on the data content display code, so that special reproduction such as fast forward reproduction can be performed.
Further, the recorded data is recorded with its data size adjusted so as to be equal to the minimum recording unit of the recording medium, so that it is easy to access the data when reproducing.

Embodiment 9 FIG. 9 shows a ninth embodiment of the present invention, in which 91 is a data content display code adding device, 92 is a data content display code removal device,
Others are the same as the third embodiment. The lower part of FIG. 9 shows the format of data stored in the recording medium 7, that is, the recording device 6
Of FIG. In the figure, reference numeral 93 denotes a block composed of a plurality of sectors 11, reference numeral 94 denotes a data content display code, and others are the same as in the third embodiment.

Next, the operation of the ninth embodiment will be described. The data content display code adding device 91 forms a block 93 from the transport stream packet 14 on which the time stamp 13 output from the time stamp adding device 5 is superimposed, that is, a plurality of packets 12, and the data content display code 94. . In the present embodiment, one block 74 is configured by collecting M packets 12.
The block 93 is composed of a plurality of sectors 11 which are the minimum data recording unit of the recording medium 7. In the present embodiment, N blocks 11 are collected to form one block 94, and the recording device 6 records the block 93 output from the data content display code adding device 91 in the sector 11 of the recording medium 7. Data content display code 9
4 has information on the contents of the block 93.

For example, it indicates which image attribute the transport stream packet 14 included in the block 93 has. The superimposed data content display code 94 is used when the reproducing device 8 reads data from the recording medium 7, for example, when reading only the block 93 having I-picture image data. Finally, the data content display code 94 and the configured block 93
Is removed from the output of the reproducing device 8 by the data content display code removing device 92.

As described above, the block 93 is a set of N sectors 11 and also a set of M packets 12. By performing recording in units of the block 93 composed of the sector 11 and the packet 12 in this manner,
Data can be efficiently stored for each block, and the reproducing device 8 selectively reads out only the blocks 93 having the I-picture image data based on the data content display code during reproduction. Thus, special reproduction such as fast forward reproduction can be performed.

As described above, according to the present embodiment, when data is recorded on a recording medium, a plurality of pieces of data are recorded with a data content display code added to perform recording.
The data size can be adjusted so that the data amount becomes equal to the recording unit obtained by collecting a plurality of minimum data recording units of the recording medium, and the use efficiency of the capacity of the recording medium can be improved. Further, at the time of data reproduction, the reproduction data is selected based on the data content display code, so that special reproduction such as fast forward reproduction can be performed.
Further, the recorded data is recorded with the data size adjusted to be equal to the recording unit obtained by collecting a plurality of minimum recording units of the recording medium, so that the data can be easily accessed at the time of reproduction. Has become.

Embodiment 10 FIG. FIG. 10 shows a tenth embodiment of the present invention. In the figure, reference numeral 101 denotes a fixed pattern data removing device, 102 denotes a fixed pattern data reproducing device, and the other components are the same as those in the first embodiment.
The lower part of FIG. 10 shows the format of data stored in the recording medium 7,
That is, the output of the recording device 6 is illustrated. In the figure, reference numeral 103 denotes a transport stream packet from which fixed pattern data has been removed, 104 denotes a packet composed of the time stamp 13 and the transport stream packet 103, and the other components are the same as those in the first embodiment.

Next, the operation of the tenth embodiment will be described. The fixed pattern data removing device 101 removes the fixed pattern data from the transport stream on which the time stamp 13 output from the time stamp adding device 5 has been superimposed.
3 is generated to form the packet 104. For example, MPEG
In the case of the -2 transport stream, it includes header information of a fixed pattern indicating the head of the packet. Also,
In order to adjust the data rate of the transmission line, a null packet having a fixed pattern including invalid data is included. The fixed pattern data removing device 101 removes fixed pattern information that is not necessary for reproducing video and audio. In this embodiment, the sector 11 is composed of three packets 104 from which the fixed pattern data has been removed. The fixed pattern data finally removed here is added to the output of the reproducing device 8 by the fixed pattern data reproducing device 102.

As described above, by removing the fixed pattern data before recording data on the recording medium 7,
The amount of information to be recorded on the recording medium 7 is reduced, and
It is possible to efficiently store data.

For example, in the case of an MPEG-2 transport stream packet, which is mainly used for broadcasting, for example, a packet containing information on a transmission path for performing reception, information on real time, information on another stream, and the like. Has also been transmitted. By removing these pieces of information that have lost their meaning and become unnecessary when recording / reproducing is performed by the fixed pattern data removing apparatus 101, the amount of information to be recorded on the recording medium 7 can be further reduced. Since these pieces of information are not used in a decoder circuit (not shown) connected to the subsequent stage of the time stamp removing device 9, there is no need to add them to the output of the reproducing device 8 by the fixed pattern data reproducing device 102.

As described above, in the present embodiment, when data is recorded on the recording medium, the fixed pattern data and unnecessary data are removed and recorded, so that the recording data amount is reduced. The recording time can be extended.

[0074]

Since the present invention is configured as described above, it has the following effects. According to the first invention, a time stamp adding unit that adds time information to an input digital video / audio data signal, a recording unit that records a data signal to which time information is added on a recording medium, Reproducing means for reproducing the recorded data; and a time stamp reading means for outputting the reproduced data signal based on the time information added to the reproduced data signal and removing the time information from the output data signal. By having the removing means,
After the time information is added to the data signal, the data signal is recorded on a recording medium, and at the time of reproduction, the data signal is reproduced according to the time information so that the recording including the information indicating the time relationship when the data is input is performed. The reproduction can be performed while maintaining the time relationship at the time of input during reproduction, and real-time performance can be ensured.

According to the second invention, a dummy header adding means for adding a dummy header to the data signal output from the time stamp adding means so as to have a data amount equal to the data amount of the minimum recording unit of the recording medium is provided. With this arrangement, the amount of data to be recorded can be made equal to the minimum data recording unit of the recording medium.

According to the third aspect of the present invention, a dummy data signal is output so that each data signal output from the time stamp adding means becomes a recording unit composed of a predetermined minimum number of recording units of a recording medium. A block header adding means for adding a header, a dummy header is added to each of a plurality of data signals recorded on the recording medium, and a recording comprising a plurality of minimum data recording units of the recording medium is collected. It is possible to record for each unit,
The data size of the data signal can be adjusted, and recording can be performed efficiently on a recording medium.

In the fourth aspect, the dummy header is error correction data for performing error correction on the input data signal. Therefore, even if a data error occurs due to recording / reproduction, the reliability of the reproduction data is improved. And a continuous moving image can be reproduced.

In the fifth invention, since the dummy header is data information indicating information relating to the data content of the input data signal, information relating to the data content can be known based on this data information, and Special playback such as search and fast forward playback can be performed.

According to the sixth aspect, a fixed pattern removing unit for removing a fixed pattern unique to data from a data signal output from the time stamp adding unit and outputting the same to the recording unit, and a data reproduced from the reproducing unit. By providing the signal with fixed pattern data reproducing means for adding the same pattern information as the fixed pattern removed by the fixed pattern removing means, when recording data on a recording medium,
By removing and recording the fixed pattern data, the amount of recording data can be saved, and the recording time can be extended.

According to the seventh aspect, since the fixed pattern data removing means for removing fixed pattern information, which is data information unnecessary at the time of reproduction, from the data signal output from the time stamp adding means, the recording is provided. When recording data on a medium, by removing fixed pattern data that becomes unnecessary data during reproduction and recording, the amount of recorded data can be saved, and the recording time can be extended.

According to the eighth aspect, for each input data signal, time information indicating a time interval at which the data signal is input is added, and the data signal to which the time information is added is recorded on a recording medium. When reproducing and outputting a data signal recorded on a recording medium, the data is output at time intervals based on the time information. Therefore, it is necessary to reproduce and output the input data at the time interval at the time of input. And real-time input data can be maintained during reproduction.

According to a ninth aspect, in the eighth aspect, a dummy header is added to the data signal to which the time information has been added so that the data amount is equal to the data amount of the minimum recording unit of the recording medium. Since recording is performed on a recording medium from the beginning, data to be recorded can be recorded with a data capacity equal to the minimum data recording unit of the recording medium, and recording can be performed efficiently.

According to a tenth aspect, in the ninth aspect, the plurality of data signals output from the time stamp adding means are formed by collecting predetermined plural minimum recording units of a recording medium. A block header adding unit for adding a dummy header so as to be a unit, so that a recording unit is formed by collecting predetermined plural minimum data recording units of a recording medium for each of a plurality of data to be recorded. And the data capacity can be made equal to that of the data, and recording can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a recording / reproducing device according to a first embodiment of the present invention and a schematic diagram of recorded data.

FIG. 2 is a configuration diagram of a recording / reproducing device according to a second embodiment of the present invention and a schematic diagram of recorded data.

FIG. 3 is a configuration diagram of a recording / reproducing device according to a third embodiment of the present invention and a schematic diagram of recorded data.

FIG. 4 is a configuration diagram of a recording / reproducing device according to a fourth embodiment of the present invention and a schematic diagram of recorded data.

FIG. 5 is a configuration diagram of a recording / reproducing device according to a fifth embodiment of the present invention and a schematic diagram of recorded data.

FIG. 6 is a configuration diagram of a recording / reproducing device according to a sixth embodiment of the present invention and a schematic diagram of recorded data.

FIG. 7 is a configuration diagram of a recording / reproducing device according to a seventh embodiment of the present invention and a schematic diagram of recorded data.

FIG. 8 is a configuration diagram of a recording / reproducing device according to an eighth embodiment of the present invention and a schematic diagram of recorded data.

FIG. 9 is a configuration diagram of a recording / reproduction device according to a ninth embodiment of the present invention and a schematic diagram of recorded data.

FIG. 10 is a configuration diagram of a recording / reproduction device according to a tenth embodiment of the present invention, and a schematic diagram of data to be recorded.

FIG. 11 is a schematic diagram of data recorded on a recording medium by a conventional recording / reproducing apparatus.

[Explanation of symbols]

1 input digital video signal, 2 reference clock generation device, 3 time stamp generation device, 4 reference time generation device, 5 time stamp addition device, 6 recording device, 7 recording medium, 8 playback device, 9 time stamp removal device, 10 output Digital video signal,
11 sectors, 12 packets, 13 time stamps, 14 transport stream packets.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Keiichi Shirasuka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5C053 FA23 FA24 GB06 GB37 GB38 HA01 HA21 JA22 LA05 LA07 5C059 MA00 PP05 PP06 PP07 RB09 RB10 RC04 RC09 RC24 RF05 SS16 UA10 5D044 AB05 AB07 BC01 BC06 CC03 CC04 DE03 DE22 DE39 DE49 DE57 DE70 DE83 DE96 EF05 FG18 FG18 FG24 GK12 5D077 AA22 AA30 BA04 BA08 CA02 DC03 DD04 EA01 EA32 EA33

Claims (10)

[Claims] 1. A time stamp adding means for adding time information to a data signal comprising a received digital video / audio signal, a recording means for recording the data signal with the time information added to a recording medium, A reproducing means for reproducing the recorded data; and a time stamp reading means for outputting the reproduced data signal based on the time information added to the reproduced data signal and removing the time information from the output data signal. A data signal recording / reproducing apparatus comprising: a removing unit. 2. A data processing apparatus according to claim 1, further comprising: a dummy header adding unit that adds a dummy header to the data signal output from the time stamp adding unit so that the data amount is equal to the data amount of the minimum recording unit of the recording medium. Claim 1
The data signal recording / reproducing apparatus according to the above. 3. A block header for adding a dummy header so that each data signal output from the time stamp adding means becomes a recording unit composed of a predetermined plurality of minimum recording units of a recording medium. 2. The data signal recording / reproducing apparatus according to claim 1, further comprising an adding unit. 4. The data signal recording / reproducing apparatus according to claim 2, wherein the dummy header is error correction data for performing error correction on an input data signal. 5. The data signal recording / reproducing apparatus according to claim 2, wherein the dummy header is data information indicating information on data content of the input data signal. 6. A fixed pattern removing means for removing a fixed pattern peculiar to data from a data signal output from a time stamp adding means and outputting the fixed pattern to a recording means; 2. The data signal recording / reproducing apparatus according to claim 1, further comprising: fixed pattern data reproducing means for adding the same pattern information as the fixed pattern removed by the removing means. 7. The apparatus according to claim 1, further comprising fixed pattern data removing means for removing fixed pattern information, which is unnecessary data information at the time of reproduction, from the data signal output from the time stamp adding means. Data signal recording / reproducing device. 8. A data signal comprising a received digital video / audio signal, to which time information indicating a time interval at which the data signal is input is added, and the data signal to which the time information is added is recorded on a recording medium. A data signal recording / reproducing method characterized in that when reproducing and outputting a data signal recorded on a recording medium, the data signal is output at time intervals based on the time information. 9. A data signal to which time information is added, wherein a dummy header is added so as to have a data amount equal to the data amount of the minimum recording unit of the recording medium, and then recording is performed on the recording medium. 9. The data signal recording / reproducing method according to claim 8, wherein: 10. A block header for adding a dummy header so that a data signal for each of a plurality of data output from the time stamp adding means becomes a recording unit including a predetermined plurality of minimum recording units of a recording medium. 9. The data signal recording / reproducing method according to claim 8, further comprising an adding unit.