JP2011198459A - Data signal recording device and data signal reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce data without losing real-time property of the data recorded, and increase utilization efficiency of the capacity of the recording medium having a fixed-size minimum recording unit.SOLUTION: A data signal recording device includes: a reception means for receiving a transport stream having a transport stream packet that stores a data signal composed of a digital video audio signal and a null packet of a fixed pattern including invalid data; and a time stamp addition means for adding only time information before a header of the transport stream packet and before a header of the null packet. Before recording, the null packet with the time information added thereto is removed from the transport stream.

Description

  The present invention has an apparatus and method for recording a compression-coded video / audio signal such as MPEG (Moving Picture Experts Group) standard on a recording medium, and a function of reproducing the compressed video / audio signal recorded on the recording medium. The present invention relates to a playback apparatus and method.

  As a method for 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 compressed moving image recording method. In the figure, 201 is a track on a recording medium, and 202 is a plurality of sequences constituting the track. The sequence 202 includes 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.

  The GOP 204 is the smallest unit that can be decoded as a moving image, and information necessary for reproduction is stored in the sequence header 203. As a result, the sequence 202 that is the smallest unit that can be reproduced is constituted. Further, sub-sequence headers 205 having the same information as the sequence header 203 are arranged in the sequence 202 at appropriate intervals.

  In order to reproduce the sequence 202, the information included in the sequence header 203 is required. For example, even when an attempt is made to reproduce from the middle of the sequence 202, the next sequence 202 can be obtained by using the subsequence header 205. Thus, it is possible to perform reproduction from the middle without waiting for the head of the image, and as a result, it is possible to perform reproduction across the sequence 202 in special reproduction or the like.

  However, since the recording / reproducing apparatus configured as described above is premised on the reproduction of the storage medium, when recording a broadcast signal composed of a digital video / audio signal or the like based on the recording / reproduction method of the storage medium. These signals are recorded without having time information. In addition, since the time reference at the time of reproduction is not stipulated, the time required for recording and the time required for reproduction do not always coincide with each other, and there is a problem that the real time property is lost.

  In addition, when the size of the GOP 204 varies depending on the image, and as a result, the size of the sequence 202 varies depending on the image. For example, when recording on a recording medium having a fixed minimum data recording unit such as a hard disk, the data to be recorded There is a problem that the capacity is wasted due to the difference between the amount and the data recording unit.

Even if the subsequence header 205 is arranged, if a data error occurs in the GOP 204 due to recording / reproduction, there is a problem that reproduction cannot be performed as a result.
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 a program cannot be recognized, and a search for a program, an inter-program or an internal search operation of a program is performed. There was a problem that it was not possible.

Even if the sequence header 203 and the sub-sequence header 205 are arranged, data breaks can be recognized only in sequence units, and fast-forward playback of programs cannot be performed precisely. It was.
Further, recording fixed pattern data and duplicated data included in the sequence header 203, the subsequence header 205, and the GOP 204 increases the recording capacity and consequently shortens the recording time. was there.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a recording method and reproducing apparatus capable of reproducing moving images and audio without losing real-time characteristics during recording and reproduction.
It is another object of the present invention to provide a recording method and reproducing apparatus with high capacity use 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 on a recording medium having a fixed minimum data recording unit such as a hard disk, the capacity is used efficiently and even if an error occurs in the data itself due to recording / reproduction, the error is corrected and continuous. It is an object of the present invention to obtain a recording method and a reproducing apparatus that enable reproduction.
In addition, a recording method and a reproducing apparatus capable of performing special reproduction such as program search at the time of reproduction with high capacity use efficiency even when recording on a recording medium having a fixed minimum data recording unit such as a hard disk. The purpose is to obtain.

In addition, a recording method and a reproducing apparatus capable of performing special reproduction such as fast-forward reproduction at the time of reproduction with high capacity use efficiency even when recording on a recording medium having a fixed minimum data recording unit such as a hard disk. The purpose is to obtain.
It is another object of the present invention to provide a recording method and a reproducing apparatus that can extend the recording time even when recording on a recording medium having a maximum recording capacity such as a hard disk.

  A data signal recording apparatus according to the present invention comprises a receiving means for receiving a transport stream having a transport stream packet storing a data signal composed of a digital video / audio signal and a null packet having a fixed pattern including invalid data; Time stamp adding means for adding only time information before the header of the port stream packet and before the header of the null packet, and recording after removing the null packet with the time information added from the transport stream Is.

  The data signal recording apparatus according to the present invention comprises a receiving means for receiving a transport stream packet storing a data signal comprising a digital video / audio signal, and a time stamp for adding only time information before the header of the transport stream packet. Recording means for adding a data start code to a block composed of a plurality of transport stream packets to which time information is added by a time stamp adding means, and data of the block to which the data start code is added Recording means for recording on the medium, so that the time information is added to the data signal, then the data is recorded on the recording medium, and the data signal is reproduced by reproducing the data signal according to the time information at the time of reproduction. It is possible to record including information indicating the time relationship Can, also it is possible to ensure the real time can be reproduced while maintaining the time relationship when input even during reproduction.

1 is a configuration diagram of a recording / reproducing apparatus according to Embodiment 1 of the present invention and a schematic diagram of recorded data. It is a block diagram of the recording / reproducing apparatus by Embodiment 2 of this invention, and the schematic diagram of the data recorded. It is the block diagram of the recording / reproducing apparatus by Embodiment 3 of this invention, and the schematic diagram of the data recorded. It is a block diagram of the recording / reproducing apparatus by Embodiment 4 of this invention, and the schematic diagram of the data recorded. It is a block diagram of the recording / reproducing apparatus by Embodiment 5 of this invention, and the schematic diagram of the data recorded. It is the block diagram of the recording / reproducing apparatus by Embodiment 6 of this invention, and the schematic diagram of the data recorded. It is the block diagram of the recording / reproducing apparatus by Embodiment 7 of this invention, and the schematic diagram of the data recorded. It is a block diagram of the recording / reproducing apparatus by Embodiment 8 of this invention, and the schematic diagram of the data recorded. It is a block diagram of the recording / reproducing apparatus by Embodiment 9 of this invention, and the schematic diagram of the data recorded. It is the block diagram of the recording / reproducing apparatus by Embodiment 10 of this invention, and the schematic diagram of the data recorded. It is a schematic diagram of the data recorded on the recording medium by the conventional recording / reproducing apparatus.

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

The TS packet 14 is a 188-byte fixed-length packet defined in the MPEG-2 system (ISO / IEC 13818-1), and is required for data coding in addition to compression-coded video signals and audio signals. It is used for transmission of various table information. Except for packets that transmit invalid data called null packets, each TS packet 14 usually has any information.
The packet 12 includes at least one TS packet 14 and a time stamp 13 of the TS packet 14. In the first embodiment, it is assumed that the packet 12 is composed of one TS packet 14 and a time stamp 13.

  Next, the operation of the first embodiment will be described. Here, it is assumed that the input digital video / audio signal 1 in FIG. 1 is an MPEG-2 transport stream defined by ISO / IEC13818-1. The MPEG-2 transport stream is often used for broadcasting, and since data is divided into fixed-size packets, transmission is relatively easy, but recording / reproduction is not premised, so once recording is performed. Some kind of time standard is required for playback.

  The reference clock generator 2 generates a reference clock necessary for generating time information described below. The time stamp generation 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 generation device 2. The time stamp 13 represents, for example, the time when the transport stream packet of the input digital video / audio signal 1 reaches the time stamp adding device 5. The time stamp adding device 5 multiplexes the time stamp 13 generated by the time stamp generating device 3 with the input digital video / audio signal 1. 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 illustrates the output of the recording device 6. The sector 11 indicates the minimum data recording unit of the recording medium. For example, in the case of an IDE (Integrated Drive Electronics) type hard disk, the sector 11 is fixed to 512 bytes. In the figure, the sector 11 is composed of two packets 12. Further, the packet 12 includes a time stamp 13 and a transport stream packet 14. In general, the size of the transport stream packet 14 is 188 bytes.

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

  In this way, 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. Real-time characteristics after recording and reproduction are maintained.

  As described above, when recording data on a recording medium, time information is superimposed as additional data on a data signal such as a digital broadcast input to the apparatus, and data is output according to the time information when reproduced. Therefore, even for data in a format that does not assume recording and reproduction, such as MPEG-2 transport stream, for example, real time can be ensured during reproduction, and the time interval of the transmitted data signal is maintained. Playback can be performed in this state.

  In FIG. 1, a portion for generating a reference clock that is used in common by the time stamp generating device 3 and the reference time generating device 4 is provided independently as the reference clock generating device 2, but for example, a recording device 6 Alternatively, a clock generation device of a microprocessor (not shown) that controls the reproduction device 8 may be used.

Embodiment 2. FIG.
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 others are the same as in the first embodiment. The lower part of FIG. 2 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 23 is a dummy header, 24 is a packet constituting the sector 11, and the others are the same as in the first embodiment.

  Next, the operation of the second embodiment will be described. The dummy header adding device 21 further superimposes a 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 to form a packet 24. Recording is performed on the recording medium 7. In this embodiment, the dummy header 23 is inserted between the time stamp 13 and the transport stream packet 14, but the position to insert is not particularly defined. The dummy header 23 superimposed here is removed from the output of the reproducing device 8 by the dummy header removing device 22.

  Here, the lower part of FIG. 2 illustrates 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 is half the size of the sector 11, that is, 2 One sector 11 can be constituted by one packet 24. 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, the present embodiment is configured to absorb the difference between the amount of data to be recorded and the minimum data recording unit of the recording medium by adding additional data when recording data on the recording medium. Therefore, 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 usage efficiency of the capacity of the recording medium can be improved. Also, since the data recorded on the recording medium can be recorded so as to be within the minimum recording unit of the recording medium, the data is not recorded across a plurality of minimum recording units, so that the data can be reproduced. Makes it easier to access data when

  In the present embodiment, the role of the dummy header 23 is only data stuffing (the data size is adjusted so that the size of each data is constant). For example, text information indicating the title of the program Etc. may be stored.

Embodiment 3 FIG.
FIG. 3 shows Embodiment 3 of the present invention. In the figure, 31 is a block header adding device, 32 is a block header removing device, and others 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, and a block obtained by collecting a plurality of sectors 11 is used as a block. Reference numeral 34 denotes a block header, and the others are 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 stamp 13 output from the time stamp adding device 5 is superimposed, that is, a plurality of packets 12, and constitutes a block 33. In this 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, N sectors 11 are collected to constitute one block 33. Further, the recording device 6 records the block 33 which is the output of the block header adding device 31 in the sector 11 of the recording medium 7. When there is no common multiple that is convenient for 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. 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 M sectors 12 as well as a set of N sectors 11. Thus, data can be efficiently stored by performing recording in units of the block 33 composed of the sector 11 and the packet 12.

  As described above, in the present embodiment, when data is recorded on the recording medium, a plurality of data is collected, and a dummy header (here, a block header) is added to the data to thereby record the minimum recording on the recording medium. Since the recording unit is formed by collecting a predetermined number of units, data can be efficiently recorded for each recording unit of the recording medium (for each block in which a plurality of sectors are collected).

  In the present embodiment, the role of the block header 23 is only data stuffing. However, for example, text information indicating the title of the program may be stored.

  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 sectors that can be continuously accessed, and is continuously recorded or reproduced. Access is easier. Thus, by selecting the value of N so that the data size that allows continuous access to the recording medium 7 is equal to the size of the block 53, it is possible to improve performance during recording and reproduction.

Embodiment 4 FIG.
FIG. 4 shows a fourth embodiment of the present invention. In the figure, 41 is an error correction code adding device, 42 is an error correction code removing device, and others are the same as in the second embodiment. The lower part of FIG. 4 illustrates the format of data stored in the recording medium 7, that is, the output of the recording device 6. In the figure, 43 is an error correction code, 44 is a packet composed of the error correction code 43, the time stamp 13 and the transport stream packet 14, and the others are the same as 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, thereby forming a packet 44. To do. In the present embodiment, two packets 44 are collected to constitute the sector 11, and the packet that is the output of the error correction code adding device 41 is recorded in the sector 11 of the recording medium 7 by the recording device 6. The error correction code 43 superimposed here is removed from the output of the reproduction apparatus 8 by the error correction code removal apparatus 42. At this time, a code error in the time stamp 13 or the transport stream packet 14 caused by recording / reproduction is generated. Will be corrected.

  As described above, by adding the error correction code 43 before data is recorded on the recording medium 7, it is possible to efficiently store the data in the sector 11, and the reliability with respect to the data error due to the recording / reproduction is improved. A high output digital video / audio signal 10 can be obtained.

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

Embodiment 5 FIG.
FIG. 5 shows a fifth embodiment of the present invention. In the figure, 51 is an error correction code adding device, 52 is an error correction code removing device, and others are the same as in 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 others are the same as in the third embodiment.

  Next, the operation of the fifth embodiment will be described. The error correction code adding device 51 constitutes a block 53 from the error correction code 54 and a plurality of transport stream packets 14, that is, packets 12 superimposed with the time stamp 13 output from the time stamp adding device 5. In the present embodiment, one block 53 is composed of M packets 12 and error correction codes 54 corresponding thereto. The block 53 is composed of a plurality of sectors 11 that are the minimum data recording unit of the recording medium 7. In this embodiment, the block 53 is composed of N sectors 11, and the recording device 6 records the block 53 that is the output of the error correction code adding device 51 in the sector 11 of the recording medium 7. The error correction code 54 superimposed here and the constructed block 53 are removed from the output of the reproduction apparatus 8 by the error correction code removal apparatus 52. At this time, the code error in the block 53 caused by recording and reproduction is not detected. Will be corrected.

  As described above, the block 53 is not only a set of N sectors 11 but also a set of M packets 12. As described above, recording is performed by using the block 53 composed of the sector 11 and the packet 12 as a unit, so that data can be stored efficiently, and a highly reliable output digital video / audio signal against a data error caused by recording / reproduction 10 can be obtained.

  As described above, in the present embodiment, when data is recorded on the recording medium, recording is performed by adding a dummy header (here, the dummy header is a block header) to a collection of a plurality of data. Thus, the data size can be adjusted so that the data amount is 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. In addition, since the block header is data of error correction information here, even when 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 and continuous. Video and audio can be played back.

Embodiment 6 FIG.
FIG. 6 shows a sixth embodiment of the present invention. In the figure, 61 is a data start code adding device for adding a data start code indicating the start position of data, which is one of data information relating to data to be recorded, 62 is a data start code removing device, and others are in the second embodiment. It is the same. 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, 63 is a data start code, 64 is a packet composed of the data start code 63, the time stamp 13, and the transport stream packet 14, and the others are the same as in the second embodiment.

  Next, the operation of the sixth embodiment will be described. The data start code adding device 61 adds 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 to form a packet 64 and records it. The device 6 records the packet 64 that is the output of the data start code adding device 61 in the sector 11 of the recording medium 7. Here, the data start code 63 has information indicating that the content of the transport stream packet 14 has changed. For example, when the transport stream packet 14 is transmitting a program composed of moving images and audio, it indicates that the program has been newly started or stores a chapter number within the program. The data start code 63 superimposed here is used for searching for a data reading start point when the reproducing apparatus 8 reads data from the recording medium 7. Finally, the data start code 63 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, it is possible to efficiently store the data in the sector 11, and at the time of reproduction, the data reading start point Searching is possible, and special playback such as searching for a program or searching for an arbitrary part can be performed.

  As described above, in this embodiment, when data is recorded on the recording medium, the data start code is simultaneously recorded as additional data, and at the time of reproduction, the reproduction start position is determined based on the data start code. In addition to improving the use efficiency of the capacity of the recording medium and knowing the starting position of the recorded data, special reproduction such as program search is made possible.

Embodiment 7 FIG.
FIG. 7 shows Embodiment 7 of the present invention. In the figure, 71 is a data start code adding device for adding a data start code indicating a data start position, which is one of data information relating to data to be recorded, 72 is a data start code removing device, and others are the same as in the third embodiment. It is the same. 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 is a block composed of a plurality of sectors 11, 74 is a data start code, and the others are the same as in the third embodiment.

Next, the operation of the seventh embodiment will be described. The data start code adding device 71 configures a block 73 from the data start code 74 and a plurality of transport stream packets 14, that is, packets 12 superimposed with the time stamp 13 output from the time stamp adding device 5. In this embodiment, one packet 73 is configured by collecting M packets 12.
The block 73 is composed of a plurality of sectors 11 that are the minimum data recording units of the recording medium 7. In the present embodiment, N sectors 11 are collected to form one block 73, and the block 73 that is the output of the data start code adding device 71 is recorded in the sector 11 of the recording medium 7 by the recording device 6. 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 moving images and sound, it indicates that the program has been newly started or stores a chapter number within the program. The data start code 74 superimposed here is used for searching for a data reading start point when the reproducing apparatus 8 reads data from the recording medium 7. Finally, the data start code 74 and the constructed block 73 are removed from the output of the reproduction apparatus 8 by the data start code removal apparatus 72.

  As described above, the block 73 is not only a set of N sectors 11 but also a set of M packets 12. In this way, recording is performed in units of the block 73 composed of the sector 11 and the packet 12, so that the data can be stored efficiently, and the data reading start point can be searched at the time of reproduction. Special playback such as cueing or searching for an arbitrary location can be performed.

  As described above, in this embodiment, when data is recorded on the recording medium, recording is performed by adding a dummy header (here, the dummy header is a data start code) to a collection of a plurality of data. Thus, the data size can be adjusted so that the data amount is 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. In addition, when data is reproduced, 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 FIG. 8, 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 recorded data. Reference numeral 82 denotes a data content display code removing device, and the other components are the same as those 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, 84 is a packet composed of a data content display code 83, a time stamp 13 and a transport stream packet 14, and the others are 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 superimposed with the time stamp 13 output from the time stamp adding device 5 to form a packet 84 and record it. The device 6 records the packet 84 that is the output of the data content display code adding device 81 in the sector 11 of the recording medium 7. Here, the data content indication code 83 has information relating to 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 image attribute is indicated. In the MPEG standard, compression-coded images are classified into the following three attributes. The first is an I picture using predictive coding within an image, and one image can be reproduced independently during reproduction. The second is a P picture that has been predictively encoded from past images, and requires past image information during reproduction. The third is a B picture that is predictively encoded from a past image and a future image, and information on the past and future images is required for reproduction. In the present embodiment, the data content indication code 83 indicates which image data of the three attributes the transport stream packet 14 has. The superimposed data content display code 83 is used when the reproducing apparatus 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 removed from the output of the playback device 8 by the data content display code removal device 82.

  As described above, by adding the data content display code 83 before data is recorded on the recording medium 7, the data can be efficiently stored in the sector 11, and the playback device 8 can reproduce the I picture during playback. By selectively reading out only the packet 84 having the image data, 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 display code is simultaneously recorded as additional data for each data, so that the data capacity of the recorded data is reduced to the minimum recording unit of the recording medium. Therefore, the usage efficiency of the recording medium can be improved. Further, since the reproduction data is selected based on the data content display code at the time of reproduction, special reproduction such as fast-forward reproduction can be performed. Furthermore, since the recorded data is recorded with the data size adjusted so as to be equal to the minimum recording unit of the recording medium, it is easy to access the data during reproduction.

Embodiment 9 FIG.
FIG. 9 shows a ninth embodiment of the present invention. In the figure, 91 is a data content display code adding device, 92 is a data content display code removing device, and the others are the same as in the third embodiment. The lower part of FIG. 9 illustrates the format of data stored in the recording medium 7, that is, the output of the recording device 6. In the figure, 93 is a block composed of a plurality of sectors 11, 94 is a data content display code, and the 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 constitutes a block 93 from the data content display code 94 and a plurality of transport stream packets 14, that is, packets 12 superimposed with the time stamp 13 output from the time stamp adding device 5. . 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 that are the minimum data recording unit of the recording medium 7. In this embodiment, N sectors 11 are collected to form one block 94, and the block 93 that is the output of the data content display code adding device 91 is recorded in the sector 11 of the recording medium 7 by the recording device 6. The data content display code 94 has information regarding the content of the block 93.

  For example, it shows 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 playback 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 constructed block 93 are removed from the output of the playback device 8 by the data content display code removal device 92.

  As described above, the block 93 is not only a set of N sectors 11 but also a set of M packets 12. As described above, recording is performed in units of the block 93 composed of the sector 11 and the packet 12, so that data can be efficiently stored for each block, and the reproducing apparatus 8 can reproduce the data content display code during reproduction. By selectively reading out only the block 93 having I-picture image data based on the above, 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 display code is added to a collection of a plurality of data and recording is performed, so that a plurality of minimum data recording units of the recording medium are recorded. The data size can be adjusted so that the data amount is equal to the collected recording unit, and the use efficiency of the capacity of the recording medium can be improved. Further, since the reproduction data is selected based on the data content display code at the time of data reproduction, special reproduction such as fast-forward reproduction can be performed.
Further, since the recorded data is recorded with the data size adjusted so as to be equal to the recording unit in which a plurality of minimum recording units of the recording medium are collected, it is easy to access the data during reproduction. It has become.

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

  Next, the operation of the tenth embodiment will be described. The fixed pattern data removing apparatus 101 generates a transport stream packet 103 from which the fixed pattern data is removed from the transport stream on which the time stamp 13 output from the time stamp adding apparatus 5 is superimposed, and forms a packet 104. For example, in the case of an MPEG-2 transport stream, it includes header information of a fixed pattern indicating the head of a packet. Further, in order to adjust the data rate of the transmission path, a fixed pattern null packet including invalid data is included. The fixed pattern data removing apparatus 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 fixed pattern data is removed. The fixed pattern data finally removed here is added to the output of the reproducing apparatus 8 by the fixed pattern data reproducing apparatus 102.

  As described above, by removing fixed pattern data before recording data on the recording medium 7, the amount of information to be recorded on the recording medium 7 can be reduced, and data can be efficiently stored in the sector 11. It becomes.

  For example, in the case of an MPEG-2 transport stream packet, since it is mainly used for broadcasting, for example, a packet including information on a transmission path for reception, information on real time, information on other streams, etc. is transmitted. ing. It is also possible to further reduce the amount of information to be recorded on the recording medium 7 by removing the information that is meaningless when recording / reproducing is performed and is removed by the fixed pattern data removing apparatus 101. Since these pieces of information are not used by a decoder circuit (not shown) connected to the subsequent stage of the time stamp removing device 9, it is not necessary 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 as to save the recording data amount. Can be extended.

Since the present invention is configured as described above, the following effects can be obtained.
According to the first invention, the time stamp adding means for adding time information to the input digital video / audio data signal, the recording means for recording the data signal to which the time information is added to the recording medium, and the recording medium Reproduction means for reproducing recorded data, and reproduction of a reproduced data signal based on time information added to the reproduced data signal, and time stamp reading for removing time information from the output data signal With the removal means,
After adding time information to the data signal, it is recorded on the recording medium, and at the time of reproduction, the data signal is reproduced according to the time information, so that recording including information indicating the time relationship when the data is input is performed. In addition, it is possible to perform reproduction while maintaining the time relationship when input, and to ensure real-time performance.

According to the second invention, the 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. So
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 invention, the dummy header is added so that each of the plurality of data signals output from the time stamp adding means becomes a recording unit consisting of a predetermined number of minimum recording units of the recording medium. Block header adding means to
A dummy header is added to each of the plurality of data signals recorded on the recording medium, and recording can be performed for each recording unit comprising a plurality of minimum data recording units of the recording medium. The size can be adjusted, and recording can be performed efficiently on the recording medium.

In the fourth invention, the dummy header is error correction data for performing error correction on the input data signal.
Even when a data error occurs due to recording and reproduction, it is possible to improve the reliability of reproduced data and reproduce a continuous moving image.

In the fifth invention, since the dummy header is data information indicating information related to the data content of the input data signal,
Based on this data information, information on the data contents can be known, and special reproduction such as program search and fast-forward reproduction can be performed.

According to the sixth invention, the fixed pattern specific to the data is removed from the data signal which is the output of the time stamp adding means, the fixed pattern removing means for outputting to the recording means, and the data signal reproduced from the reproducing means, By including 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 the recording medium, the fixed pattern data is removed and recorded, so that the amount of recording data can be saved and the recording time can be extended.

According to the seventh invention, by including fixed pattern data removing means for removing fixed pattern information that is data information that is not required at the time of reproduction from the data signal that is output from the time stamp adding means,
When data is recorded on the recording medium, the fixed pattern data, which is unnecessary data during reproduction, is removed and recorded, so that the amount of recording data can be saved and the recording time can be extended.

According to the eighth aspect of the invention, 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 the recording medium. When the data signal recorded on the medium is reproduced and output, it is output at time intervals based on the above time information.
The input data can be reproduced and output at the time interval at the time of input, and the real time property of the input data can be maintained even during the reproduction.

According to the ninth invention, in the eighth invention, after adding a dummy header to the data signal to which the time information is added so that the data amount is equal to the data amount of the minimum recording unit of the recording medium, Because we record to
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 the tenth aspect, in the ninth aspect, each of the plurality of data signals output from the time stamp adding means is a recording unit comprising a predetermined plurality of minimum recording units of the recording medium. By providing a block header adding means for adding a dummy header,
For each piece of data to be recorded, the data capacity can be made equal to the data of the recording unit consisting of a predetermined number of minimum data recording units of the recording medium, and recording can be performed efficiently.

1 input digital video signal, 2 reference clock generator,
3 time stamp generator, 4 reference time generator,
5 Time stamp adding 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 stamp, 14 Transport stream packet.

Claims (2)

Receiving means for receiving a transport stream packet including a data stream composed of a digital video / audio signal and a transport stream packet having a fixed pattern of null packets including invalid data;
Timestamp adding means for adding only time information before the header of the transport stream packet and before the header of the null packet;
A data signal recording apparatus for recording after removing the null packet to which the time information is added from the transport stream. A data signal reproducing apparatus for reproducing a data signal recorded by the data signal recording apparatus according to claim 1.

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