JP3111806B2 - Signal recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording apparatus and a video signal reproducing apparatus used for recording and reproducing a video signal.

[0002]

2. Description of the Related Art In recent years, there has been remarkable introduction of digital technology into video signal recording / reproducing devices, and several digital recording type video signal recording / reproducing devices have been put into practical use. In addition, transmission and reception of television signals using such digital techniques are being studied.

A conventional digital recording type video signal recording / reproducing apparatus records and encodes compressed image data and records it, as disclosed in, for example, Japanese Patent Application No. 5-79236 "Video signal recording / reproducing apparatus". It was an apparatus for recording and reproducing on a medium.

Hereinafter, an example of a conventional video signal recording / reproducing apparatus will be described with reference to the drawings.

FIG. 12 is a block diagram of a conventional digital video signal recording device. 12, 72 is an input terminal, 73 is an image signal conversion circuit, 74 is an encoding circuit, 7
5 is a shuffling circuit, 76 is an ECC circuit, 77 is a recording amplifier, 78 is a recording head, 79 is a tape-shaped recording medium,
80 is a reproducing head, 81 is a reproducing amplifier, 82 is an ECC circuit, 83 is a deshuffling circuit, 84 is a decoding circuit, 8
5 is an image signal restoration circuit, and 86 is an output terminal.

In this embodiment, the digital image signal inputted to the input terminal 72 is compressed and recorded in the image signal conversion circuit 73 by using MPEG2 or the like.
The compressed digital image signal is recorded and encoded by the encoding circuit 74, and the order of recording by the shuffling circuit 75 is rearranged. Thereafter, an error correction code is added by the ECC circuit 76, and is recorded on the tape-shaped recording medium 79 via the recording amplifier 77 and the recording head 78.

At the time of reproduction, a reproduction signal read by a reproduction head 80 (which may also be used as the recording head 78) is input to an ECC circuit 82 through a reproduction amplifier 81. Here, errors during recording and reproduction are corrected as much as possible, and the order is rearranged by the deshuffling circuit 83. Next, the reproduced signal decoded by the decoding circuit 84 is restored by the image signal restoring circuit 85, output as an original image signal from the output terminal 86, and a reproduced image is obtained.

In this embodiment, the digital video signal compressed by, for example, MPEG2 or the like is recorded on a recording track on the tape-shaped recording medium 79 after being subjected to processing such as recording encoding as it is. .

Therefore, even if the input digital video signal is originally a compressed digital signal such as an MPEG2 transmission bit stream, the recording and encoding processing is performed in the same manner, and the data is recorded as it is on a tape recording medium. It was supposed to play.

[0010]

However, in the video signal recording / reproducing apparatus of the prior art, a television signal transmitted as a digital video signal such as ATV (MPEG2) in the United States is received and its transmission bit is transmitted. When recording and playing back the stream as it is,
At the time of reproduction, it was necessary to select the channel of the broadcasting station with the decoder.

In other words, a television signal transmitted as a digital video signal can be transmitted by multiplexing a transport packet as a transmission unit on a plurality of channels. Has an ID signal indicating a channel or the like of a broadcasting station. Therefore, at the time of normal reception, the channel of the broadcasting station is selected by the decoder, thereby referring to the ID signal in the bit stream and receiving the selected broadcast program.
Decodes image data and audio data. However, according to the video signal recording / reproducing apparatus which records and reproduces the transport bit stream of these transport packets as they are, when performing the reproduction, the channel of the broadcast station being reproduced at that time must be selected by the decoder. If the channel of the video signal recorded during reproduction or search changes, the channel of the decoder must be re-selected, which involves a very complicated operation.

Accordingly, an object of the present invention is to provide a video signal recording or reproducing apparatus which does not require channel reselection of a recorded television signal.

[0013]

In order to achieve the above object, a video signal recording or reproducing apparatus according to the present invention comprises an image signal and an audio signal in a transmission bit stream comprising transport packets of an input digital image signal. Is replaced with an ID signal portion representing the contents of the above. I
The D signal portion is a transport packet identification signal (P
ID), and a table that defines to which transport packet the contents of the image signal and the audio signal are transmitted. At this time, the table or PID representing the contents of the broadcast station or the like is replaced with a unique table or PID indicating a storage medium such as a VTR. Alternatively, if there is no channel for the storage medium, it is replaced with an ID signal indicating the channel of any broadcast station, and this is used for the storage medium. Thus, when a channel for a storage medium is selected by a decoder at the time of reproduction, even when a recording medium on which transmission bit streams from a plurality of broadcasting stations are recorded is reproduced, it is not necessary to reselect a channel at the decoder. The ID signal portion of the image signal may be replaced before recording on the recording medium or after reproducing.

[0014]

According to the present invention, when image data reproduced from a VTR or the like is sent to a decoder, the decoder selects a channel of a storage medium and decodes the reproduced image data. Can be reproduced without the need for complicated operations.

[0015]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a video signal recording / reproducing apparatus according to one embodiment of the present invention. In FIG. 1, 1 is an input terminal, 2 is an ID replacement circuit, 3 is an encoding circuit, 4 is a shuffling circuit, 5 is an ECC circuit, 6 is a recording amplifier, 7 is a recording head, 8 is a tape-shaped recording medium, 9 Is the playback head,
10 is a reproduction amplifier, 11 is an ECC circuit, 12 is a deshuffling circuit, 13 is a decoding circuit, and 14 is an output terminal.

The operation of each section will be described below. First, a transmission bit stream including a transport packet of a received television signal is input from an input terminal 1. Next, in the ID replacement circuit 2, the ID signal portion representing the broadcast station or the like is replaced with the ID signal portion representing the storage medium. At this time, the ID signal section includes not only broadcast stations,
It is also conceivable that different ID signals are given depending on programs and the like.

Further, since the number of ID signals representing the broadcast station, the program, etc. is large, the ID signals may be transmitted using two or more pointers. FIG. 2 shows a conceptual diagram of the ID signal section. That is, as shown in FIG. 2, first, as a first-stage pointer, an ID signal (PID) of a transport packet in which a program table is described
Get. The program represents a bit stream itself such as a program from a certain broadcasting station, and the program table is a table indicating an ID signal of a transport packet transmitting the program. Next, referring to the transport packet having the obtained packet ID, a transport packet ID in which the bit stream of each program is transmitted is obtained as a second-stage pointer from the program table, and the transport packet is obtained. , A bit stream of a desired program can be obtained. Therefore, when replacing the ID signal portion with the ID signal portion indicating the storage medium as described above, as shown in FIG. 3, one of all the ID signal portions serving as pointers is replaced, It is necessary that a transport packet in which a bit stream to be recorded is transmitted can be selected on a channel for a storage medium.

Next, the transmission bit stream in which the ID signal portion has been replaced is input to the encoding circuit 3, where encoding for recording is performed. After that, in the shuffling circuit 4, the order of recording on the tape-shaped recording medium can be changed so as to increase the efficiency of error correction. Next, after the ECC circuit 5 adds the error correction code, the recording signal amplified by the recording amplifier 6 is recorded on the tape-shaped recording medium 8 by the recording head 7.

At the time of normal reproduction, a signal is read from each recording track by using a reproduction head 9 (which may also be used as the recording head 7), and a reproduction signal is obtained through a reproduction amplifier 10. First, the ECC circuit 1
In step 1, error correction is performed, and errors during recording and reproduction are corrected as much as possible. The signal after error correction enters the deshuffling circuit 12.

Thereafter, the data is decoded by the decoding circuit 13 and output from the output terminal 14 as a bit stream similar to the input transmission bit stream of the television broadcast. The reproduced bit stream is input to a decoder, and is decoded by selecting a channel for a recording medium by the decoder, so that a reproduced screen can be obtained.

Note that the channel for the storage medium is not limited to the channel dedicated to the storage medium, but may be a channel for a certain broadcasting station.

(Embodiment 2) FIG. 4 is a block diagram showing a video signal recording / reproducing apparatus according to Embodiment 2 of the present invention. In FIG. 4, 15 is an input terminal, 16 is an encoding circuit, 17 is a shuffling circuit, 18 is an ECC circuit, 19 is a recording amplifier,
20 is a recording head, 21 is a tape-shaped recording medium, 22 is a reproducing head, 23 is a reproducing amplifier, 24 is an ECC circuit, 25
Is a deshuffling circuit, 26 is a decoding circuit, and 27 is an ID
The replacement circuit 28 is an output terminal.

As shown in FIG. 4, the second embodiment differs from the first embodiment only in that replacement of an ID signal is performed after reproduction.

The operation of each section will be described below. First, a transmission bit stream composed of transport packets of a received television signal is input from an input terminal 15 and input to an encoding circuit 16, where encoding for recording is performed. After that, in the shuffling circuit 17, the recording order can be changed. Next, after the ECC circuit 18 adds the error correction code, the recording signal amplified by the recording amplifier 19 is recorded on the tape recording medium 21 by the recording head 20.

At the time of normal reproduction, the reproduction head 22
(May also be used as the recording head 20) to read signals from each recording track,
To obtain a reproduction signal. First, error correction is performed on the reproduced signal by the ECC circuit 24, and errors during recording and reproduction are corrected as much as possible. The signal after the error correction is input to the deshuffling circuit 25, and the order is restored by an operation reverse to that at the time of recording.

Thereafter, a bit stream similar to the transmission bit stream of the television broadcast input by decoding by the decoding circuit 26 is obtained. In the second embodiment, a series of ID signal parts which are input to the ID replacement circuit 27 and represent a broadcast station or a program by the same operation as the ID replacement circuit 2 of the first embodiment are converted into IDs for storage media.
Replaced by the signal part. Thus, the transmission bit stream having the ID signal section for the storage medium is output from the output terminal 28. The reproduced bit stream is input to a decoder in the same manner as in the first embodiment, and is decoded by selecting a channel for a recording medium by the decoder, so that a reproduction screen can be obtained.

In each of the first and second embodiments, the ID signal portion representing a broadcasting station or a program is recorded on a tape-shaped recording medium.
Instead of deleting the ID signal portion on the recording side and recording, the ID signal for the storage medium may be added by an ID adding circuit after reproduction.

(Embodiment 3) FIG. 5 is a block diagram showing a video signal recording / reproducing apparatus according to Embodiment 3 of the present invention. In FIG. 5, 29 is an input terminal, 30 is a PMT and PID replacement circuit, 31 is an encoding circuit, 32 is a shuffling circuit, 33
Is an ECC circuit, 34 is a recording amplifier, 35 is a recording head,
36 is a tape-shaped recording medium, 37 is a reproducing head, 38 is a reproducing amplifier, 39 is an ECC circuit, 40 is a deshuffling circuit, 41 is a decoding circuit, and 42 is an output terminal.

As shown in FIG. 5, the structure of the third embodiment is almost the same as that of the first embodiment. In this embodiment, ATV is used as an example of an input digital television signal.
Let us consider a signal based on MPEG2 adopted in the above. MPEG
In 2, it is possible to multiplex video and audio of various programs (programs) transmitted from each broadcasting station with transport packets and transmit the multiplexed data.

The operation of each section will be described below. First, a transmission bit stream composed of the received MPEG2 transport packet is input from the input terminal 29 and input to the PMT / PID replacement circuit 30. The operation here is shown in FIGS. First, FIG.
Here is a brief description of how to specify a program in. This is indicated via a two-stage pointer as described below as an ID signal portion, as described in the first embodiment.

First, the ID of the transport packet
A PAT (program association table) included in a packet whose (PID) is 0 is referred to. This table describes a table in which a program number indicating each program is associated with a PID of a transport packet including each PMT (program map table). PMT is an elementary stream of each program (bit stream including video, audio signal, etc.)
, The PID of the transport packet in which
It is a table in which information such as PID of a packet including a clock is described. Therefore, by referring to the PMT next, the PID to which each elementary stream of the program is transmitted is obtained, and the video and audio of each program can be obtained.

When a channel is actually selected by the decoder, various programs are selected through such a two-stage pointer. Therefore, by rewriting a part of these pointers and tables, it is possible to perform reproduction with the decoder channel fixed, regardless of the type of program to be reproduced.

As an example, FIG. 7 shows an example in which the PMT is replaced. In FIG. 7, it is assumed that the reproduced image from the VTR can be viewed when the channel x is selected on the decoder side. The PAT indicates that the PMT of the program x is written in a transport packet whose PID is Mx. Therefore, this Mx
May be replaced with a part of the PMT of the program number to be recorded. That is, as shown in the figure, for example, when recording the program number 2, the PID number at which the elementary stream of the program x or the like is transmitted is replaced with the PID number portion of the elementary stream of the program number 2 or the like. Good. That is, PI representing the clock, video, audio, etc. in the PMT of the program x
D is a number such as Exc, Exv, Exa, etc.
c, E2v, E2a, etc. Thus, when the channel x is selected by the decoder during reproduction of the VTR, the recorded program 2 is reproduced.

Therefore, in addition to x as in the above example,
If the information such as the elementary stream PID in the PMT of all the programs is replaced with the information such as the PID of the program to be recorded, not only the channel x but also the
Playback images from the VTR can be viewed on all channels.

FIG. 8 shows another example in which the PID is replaced. In FIG. 8, when the channel x is selected on the decoder side, the VTR
It is assumed that the user can view the reproduced image from. At this time, the PID number and Ex of the elementary stream of the program x, the PID of the packet transmitting the clock, and the like are designated by the two-stage pointer. Therefore, as shown in FIG. 8, the PIDs through which the elementary streams of the program to be recorded (program 2 in this example) are transmitted are all Exc, Exv, and Exa.
May be replaced with PIDs representing clock, video, audio, etc. of the program x and recorded.

In each of the above examples, basically, a case where a reproduced image from a VTR is viewed on an existing channel (in each example, channel x), as shown in FIG.
In the case where one channel is allocated exclusively to the storage medium, the same can be realized by changing the PMT and PID of the storage medium channel (referred to as channel DSM) as in each of the above examples. The figure shows the program DS
When reproducing M, the program DSM is designed to specify the PID on which the video and audio of the program to be recorded are recorded.
Is replaced. This is the same as the method shown in FIG. 7, but the reproduced image from the VTR can be viewed on the channel DSM by employing the method shown in FIG.

The input signal, in which a part of the ID signal portion of each recording program is replaced as described above,
1 and recording encoding is performed to a code for actual recording. After that, in the shuffling circuit 32, the recording order can be changed. Next, after the ECC circuit 33 adds the error correction code, the recording amplifier 34
The recording signal amplified by is recorded on the tape-shaped recording medium 36 by the recording head 35.

At the time of normal reproduction, a signal is read from each recording track using a reproduction head 37 (which may also be used as the recording head 35), and a reproduction signal is obtained through a reproduction amplifier 38. First, the EC
Error correction is performed by the C circuit 39, and errors during recording and reproduction are corrected as much as possible. The signal after the error correction enters the deshuffling circuit 40, and the operation is completely reversed from the rearrangement at the time of recording, and the order is restored.

Thereafter, a bit stream in which the ID signal portion is replaced is obtained in the same manner as the transmission bit stream of the television broadcast input by decoding by the decoding circuit 41.

The transmission bit stream having the ID signal portion thus replaced is output from the output terminal 42. The reproduced bit stream is input to the decoder as in the first and second embodiments, and the channel (program x or program DSM) determined for the recording medium by the decoder is used.
, Etc.), and a playback screen can be obtained.

In this embodiment, the substituted I
The D signal or the like may be recorded in another portion such as the AUX area on the recording medium, and these ID signals may be obtained at the time of reproduction, and the above operation may be performed in exactly the same manner.

(Embodiment 4) FIG. 10 is a block diagram showing a video signal recording / reproducing apparatus according to Embodiment 4 of the present invention. FIG.
In the figure, 43 is an input terminal, 44 is an encoding circuit, 45 is a shuffling circuit, 46 is an ECC circuit, 47 is a recording amplifier, 48 is a recording head, 49 is a tape-shaped recording medium, 50
Is a reproducing head, 51 is a reproducing amplifier, 52 is an ECC circuit,
53 is a deshuffling circuit, 54 is a decoding circuit, 55 is a PMT and PID replacement circuit, and 56 is an output terminal.

As shown in FIG. 10, the configuration of the fourth embodiment is almost the same as that of the third embodiment, except that the table of the ID signal portion of each program is replaced or added on the reproducing side.

The operation of each section will be described below. First, a received transmission bit stream composed of MPEG2 transport packets is input from an input terminal 43 and input to an encoding circuit 44, where recording encoding is performed to codes for actual recording. Thereafter, in the shuffling circuit 45, the recording order can be changed. Next, after the ECC circuit 46 adds the error correction code, the recording signal amplified by the recording amplifier 47 is recorded on the tape recording medium 49 by the recording head 48.

At the time of normal reproduction, a signal is read from each recording track using the reproduction head 50 (which may also be used as the recording head 48), and a reproduction signal is obtained through the reproduction amplifier 51. First, the EC
Error correction is performed by the C circuit 52, and errors during recording and reproduction are corrected as much as possible. The signal after the error correction enters the deshuffling circuit 53, and the operation is completely reversed from the rearrangement at the time of recording, and the order is restored. After that, a bit stream similar to the input television broadcast transmission bit stream obtained by decoding by the decoding circuit 54 is obtained and input to the PMT / PID replacement circuit 55.

In the PMT / PID replacement circuit 55,
The same operation as in FIGS. 6 to 9 described in the third embodiment is performed, and each ID signal is replaced. That is, replacement of the PMT shown in FIG. 7, replacement of the PID as shown in FIG.
As shown in FIG. 9, there are various methods such as allocating one channel exclusively to storage media.

The transmission bit stream having the ID signal portion thus replaced is output from the output terminal 56. The reproduced bit stream is input to the decoder in the same manner as the other embodiments, and the channel (program x or program DS) determined for the recording medium by the decoder is used.
M) is decoded to obtain a playback screen.

In this embodiment, the ID signal and the like are recorded in another portion such as the AUX area on the recording medium, and these ID signals are obtained at the time of reproduction, and the above operation is performed in the same manner. Good.

(Embodiment 5) FIG. 11 is a block diagram showing a video signal recording / reproducing apparatus according to Embodiment 5 of the present invention. FIG.
, 57 is an input terminal, 58 is an ID separation and PID replacement circuit, 59 is an encoding circuit, 60 is a shuffling circuit,
61 is an ECC circuit, 62 is a recording amplifier, 63 is a recording head, 64 is a tape-shaped recording medium, 65 is a reproducing head, 66
Denotes a reproduction amplifier, 67 denotes an ECC circuit, 68 denotes a deshuffling circuit, 69 denotes a decoding circuit, 70 denotes a PAT / PMT addition circuit, and 71 denotes an output terminal.

As shown in FIG. 11, the configuration of the fifth embodiment is almost the same as that of the fourth embodiment, except that the table of the ID signal portion of each program is separated before recording, deleted, and not recorded. ing.

The operation of each section will be described below. First, a transmission bit stream composed of the received MPEG2 transport packet is input from an input terminal 57 and input to an ID separation / PID replacement circuit 58. Here, a table which is a pointer related to an ID signal portion such as PAT and PMT is separated. Separated ID
The signal part is deleted and is not recorded on the recording medium. Instead, the PID of the transport packet in which the elementary stream such as each video and audio is transmitted is replaced with a PID for a storage medium determined in advance.

Thereafter, the transmission bit stream other than the ID signal portion is encoded by the encoding circuit 59, the shuffling circuit 60, and the EC.
After the C circuit 61, the recording amplifier 62, and the same processing as in the fourth embodiment, the recording is performed on the tape-shaped recording medium 64 by the recording head 63.

At the time of normal reproduction, similarly to the fourth embodiment, a signal is read from each recording track by using a reproduction head 65 (which may also be used as the recording head 63), and a reproduction amplifier 66 and an ECC circuit 67 are used. , A deshuffling circuit 68 and a decoding circuit 69 to obtain a reproduced bit stream, which is input to a PAT / PMT adding circuit 70.

In the PAT / PMT addition circuit 70,
It is necessary to newly add an ID signal part. Also in this case, the elementary stream in the reproduced bit stream is transmitted according to the principle described in each of the above-described embodiments, that is, when the channel fixed for the storage medium is selected by the decoder. The decoding is performed by referring to the existing PID. That is, PA
T, PID to be referred by PMT, ID separation at the time of recording, P
PAT and PMT fixed so as to become the PID replaced by the ID replacement circuit 58 are generated, and these are added.

The transmission bit stream having the newly added ID signal portion is output from the output terminal 71. The reproduced bit stream is input to a decoder in the same manner as in the other embodiments, and is decoded by selecting a channel determined for a recording medium by the decoder, thereby obtaining a reproduction screen.

In each of the embodiments described above, the video signal recording / reproducing apparatus has been described. However, the same configuration may be applied to the video signal recording apparatus or the video signal reproducing apparatus alone.

In the various embodiments described above, the case of the VTR has been described. However, the transmission bit transmitted to the decoder via a tuner for selecting a channel from an optical disk or other storage media or another communication path is described. A similar configuration may be applied to a stream or a transmission bit stream having a similar ID signal portion other than MPEG2.

The same operations and processes as those described in the above embodiments may be performed during special reproduction such as high-speed reproduction or slow reproduction of a VTR or an optical disk.

[0060]

As described above, according to the present invention, at the time of recording or reproduction, the table and PID relating to the ID signal portion representing the contents of the transmission bit stream are replaced, and the bits of the transmission bit stream are fixed. By obtaining a playback bit stream that is a stream,
Various programs recorded on a storage medium such as a TR can be easily selected and decoded by a decoder, and a reproduced image and a sound can be obtained without requiring a complicated operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a video signal recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 2 is a conceptual diagram showing an ID signal portion of a transmission stream to be recorded and reproduced according to an embodiment of the present invention.

FIG. 3 is a conceptual diagram showing an ID signal portion of a transmission stream to be recorded and reproduced in an embodiment of the present invention.

FIG. 4 is a block diagram illustrating a video signal recording / reproducing apparatus according to a second embodiment.

FIG. 5 is a block diagram illustrating a video signal recording / reproducing apparatus according to a third embodiment.

FIG. 6 is a conceptual diagram illustrating the operation of a PMT / PID replacement circuit according to a third embodiment.

FIG. 7 is a conceptual diagram illustrating the operation of a PMT / PID replacement circuit according to a third embodiment;

FIG. 8 is a conceptual diagram illustrating an operation of a PMT / PID replacement circuit according to a third embodiment.

FIG. 9 is a conceptual diagram showing the operation of the PMT / PID replacement circuit according to the third embodiment.

FIG. 10 is a block diagram illustrating a video signal recording / reproducing apparatus according to a fourth embodiment.

FIG. 11 is a block diagram illustrating a video signal recording / reproducing apparatus according to a fifth embodiment.

FIG. 12 is a block diagram showing a conventional video signal recording / reproducing apparatus.

[Explanation of symbols]

2,27 ID replacement circuit 3,16,31,44,59,74 Encoding circuit 4,17,32,45,60,75 Shuffling circuit 5,11,18,24,33,39,46,52, 6
1, 67, 76, 82 ECC circuit 6, 19, 34, 47, 62, 77 Recording amplifier 7, 20, 35, 48, 63, 78 Recording head 8, 21, 36, 49, 64, 79 Tape recording medium 9 , 22, 37, 50, 65, 80 Reproduction head 10, 23, 38, 51, 66, 81 Reproduction amplifier 12, 25, 40, 53, 68, 83 Deshuffling circuit 13, 26, 41, 54, 69, 84 Decoding Conversion circuit 30, 55 PMT, PID replacement circuit 58 ID separation, PID replacement circuit 70 PAT, PMT addition circuit 73 Image signal conversion circuit 85 Image signal restoration circuit

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Mutsuyuki Okayama 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-company (56) References JP-A-6-292123 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/91-5/956 H04N ^7/ 24-7/68 G11B 20/10-20/12

Claims (9)

(57) [Claims] 1. A digital signal transmission packet group having N1 types of recognition signals from a first group to an N1 group (N1 is an integer of 1 or more), each of which comprises a plurality of transmission packets. In the transmission path that is being transmitted, the transmission packet groups of the first group to the N1st group are defined as a first layer, and the transmission packet group of the first layer collectively includes a plurality of the transmission packet groups. A second layer transmission packet group of an N2 group (N2 is an integer equal to or greater than 1) is formed from the group, and the N2 type transmission packet group of the second layer is formed by grouping a plurality of the transmission packet groups into a first group. To form an N3 group (N3 is an integer of 1 or more) third-layer transmission packet group.
Sequentially from the first group of the k-th layer (k is an integer of 1 or more) to the N k -th layer
It is assumed that a group (Nk is an integer of 1 or more) of Nk types of transmission packet groups is included, and the mth hierarchy (m is an integer of 2 or more and k or less) is included in each transmission packet group of the mth hierarchy. There are n types (n is an integer of 1 or more and N1 or less) of recognition signals from a transmission path through which a transmission packet group including a table group that defines a transmission packet group of the (m-1) th hierarchy using a recognition signal is transmitted at the same time. In a signal recording / reproducing apparatus for extracting and recording and reproducing a transmission packet group, a part or all of a table group of each layer or a part or all of an identification signal of the transmission packet group to be recorded and reproduced is replaced or added. 1. A signal recording / reproducing apparatus comprising: 2. A means for replacing or adding a part or all of a table group of each layer or a part or all of an identification signal of a transmission packet group to be recorded before recording on a recording medium. The signal recording / reproducing apparatus according to claim 1, wherein 3. A means for replacing or adding a part or all of a table group of each layer or a part or all of an identification signal of a reproduced transmission packet group after reproducing it from a recording medium. The signal recording / reproducing apparatus according to claim 1, wherein 4. A means for deleting a table group of each hierarchy, a means for replacing a part or all of an identification signal of a transmission packet group to be recorded and reproduced, a means for recording and reproducing the transmission packet group, and the recording and reproduction 2. The apparatus according to claim 1, further comprising: means for generating a table group for the transmission packet group, and means for combining the transmission packet group to be recorded / reproduced with the table group generated by the table group generation means. Signal recording and reproducing device. 5. A means for sequentially replacing a table group of each layer from an m-th layer (m is an integer of 2 or more and k or less) to a second layer, wherein said table group is replaced by said m-th layer. The specific definition included in the specific table of the hierarchy is defined so as to sequentially indicate the group of tables of each layer up to the second layer, and the table of the second layer is a part of the transmission packet group to be recorded and reproduced. The signal recording / reproducing apparatus according to any one of claims 1 to 3, wherein each of the table groups is replaced so as to define all of the tables. 6. A means for replacing an identification signal of a transmission packet group to be recorded / reproduced, wherein a specific definition included in a specific table of an m-th layer (m is an integer of 2 or more and k or less) is sequentially Means for replacing the identification signal so as to indicate a table group of each layer up to the second layer, and to define the group of tables of the second layer indicating the transmission packet group to be recorded and reproduced. The signal recording / reproducing apparatus according to any one of claims 1 to 3, wherein the identification signal of the transmission packet group is replaced. 7. The content of each transmission packet group of a specific hierarchy is:
7. A digital signal constituting an independent program comprising a video signal or an audio signal.
The signal recording / reproducing device according to any one of the above. 8. A transmission packet group to be recorded and reproduced comprises three layers (k = 3).
8. The signal recording / reproducing device according to any one of 7. 9. A transmission packet group to be recorded and reproduced is composed of three layers (k = 3), and each transmission packet group of the second layer includes at least a digital video signal and a digital audio signal synchronized therewith. The signal recording / reproducing apparatus according to any one of claims 1 to 8, wherein