JPH07327199A - Signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the need for selecting a channel for a reproduction output of a different program by replacing a definition table for an identification signal (PID) of a transmission packet and a pointer pointing out the PID or the like. CONSTITUTION:A transmission bit stream comprising a transport packet of a received television signal is given to an ID replacement circuit 2, in which an ID signal part representing a broadcast station and a program or the like is replaced with an ID signal part representing a storage medium. Then the signal is coded by tape recording use at a coding circuit 3, and the recording sequence is arranged again by using a shuffling circuit 4 to increase an error correction efficiency and after an error correction code is applied by an ECC circuit 5, the resulting signal is fed to a recording head 7 via a recording amplifier 6. The ECC circuit 11 applies error correction to the tape reproduction signal and the resulting data are rearranged by a de-shuffling circuit 12 and decoded by a decoding circuit 13. The decoder selects a recording medium channel and a reproduced screen is obtained from a reproduction bit stream.

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 device and a video signal reproducing device used for recording and reproducing a video signal.

[0002]

2. Description of the Related Art In recent years, there has been a remarkable introduction of digital technology to video signal recording / reproducing apparatuses, and some digital recording type video signal recording / reproducing apparatuses have been put into practical use. Further, transmission / reception of television signals using such a digital technique is also under study.

A conventional digital recording type video signal recording / reproducing apparatus records and encodes compressed image data by recording and recording the compressed image data 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.

An example of a conventional video signal recording / reproducing apparatus will be described below with reference to the drawings.

FIG. 12 is a block diagram of a conventional digital video signal recording apparatus. In FIG. 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
Reference numeral 5 is an image signal restoration circuit, and 86 is an output terminal.

In this example, the digital image signal input to the input terminal 72 is compressed by the image signal conversion circuit 73 using MPEG2 or the like and recorded.
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. After that, 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.

During reproduction, the reproduction signal read by the reproduction head 80 (which may also serve as the recording head 78) is input to the ECC circuit 82 through the 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 reproduction signal decoded by the decoding circuit 84 is restored in the image signal restoration circuit 85, becomes an original image signal, and is output from the output terminal 86 to obtain a reproduced image.

In this example, a digital video signal compressed by MPEG2 or the like is recorded on a recording track on the tape-shaped recording medium 79 after being directly subjected to a recording coding process and the like. .

Therefore, even when the input digital video signal is originally a compressed digital signal such as a transmission bit stream of MPEG2, the same recording / coding processing is performed and the data is directly recorded on the tape-shaped recording medium. It was thought to play.

[0010]

However, in the video signal recording / reproducing apparatus as in the conventional example, 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. If you want to record the stream as it is and play it back,
It was necessary to select the channel of the broadcasting station with the decoder during playback.

That is, a television signal transmitted as a digital video signal can be transmitted by transporting transport packets, which is the transmission unit, by multiplexing it on a plurality of channels. Has an ID signal representing a channel of the broadcasting station. Therefore, at the time of normal reception, the channel of the broadcasting station is selected by the decoder, the ID signal in the bit stream is referred to, and the selected broadcasting program is received.
Image data and audio data are decoded. However, according to the video signal recording / reproducing apparatus that records and reproduces the transmission bitstream of these transport packets as they are, when reproducing, the channel of the broadcasting station being reproduced at that time must be selected by the decoder. When the channel of the video signal recorded during the reproduction or search changes, the channel of the decoder also has to be reselected, which causes a problem of extremely complicated operation.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a video signal recording or reproducing apparatus which does not require channel reselection of recorded television signals.

[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 consisting of transport packets of an input digital image signal. The ID signal portion representing the contents of is replaced. I
The D signal portion is an identification signal (P
ID) and a table for defining in which transport packet the contents of the image signal and the audio signal are transmitted. At this time, the table or PID indicating the contents of the broadcasting station or the like is replaced with a unique table or PID indicating the storage medium such as the VTR. Alternatively, if there is no channel for the storage medium, it is replaced with an ID signal representing the channel of any broadcasting station, and this is used for the storage medium. Thus, when the decoder selects the channel for the storage medium at the time of reproduction, the channel reselection at the decoder is not necessary even when the recording medium in which the transmission bitstreams from a plurality of broadcasting stations are recorded is reproduced. Further, the ID signal portion of the image signal may be replaced before or after recording on the recording medium.

[0014]

According to the present invention, when the image data reproduced from the VTR or the like is sent to the decoder by the above-mentioned structure, the decoder selects the channel of the storage medium and decodes the reproduced image data. It is possible to reproduce the transmission bit stream broadcast from the device without requiring a complicated operation.

[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 an embodiment of the present invention. In FIG. 1, 1 is an input terminal, 2 is an ID replacing 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, and 9 is a recording medium. Is the playhead,
Reference numeral 10 is a reproducing 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 unit will be described below. First, a transmission bit stream consisting of transport packets of a received television signal is input from the input terminal 1. Next, in the ID replacement circuit 2, the ID signal part representing the broadcasting station or the like is replaced with the ID signal part representing the storage medium. At this time, the ID signal part is not limited to the broadcasting station,
It is also conceivable that different ID signals are given depending on programs and the like.

Since the number of ID signals representing the broadcasting station, program, etc. is large, the ID signals may be transmitted using pointers of two stages or more. A conceptual diagram of this ID signal section is shown in FIG. That is, as shown in FIG. 2, the ID signal (PID) of the transport packet in which the program table is written as the first-stage pointer.
To get This program represents a bit stream itself of a program or the like from a certain broadcasting station, and the program table is a table showing ID signals and the like of transport packets transmitting the program. Next, the transport packet having the obtained packet ID is referred to, the transport packet ID in which the bit stream of each program is transmitted is obtained from the program table as the second stage pointer, and the transport packet is obtained. By referring to, a bitstream of a desired program can be obtained. Therefore, when replacing the ID signal part with the ID signal part indicating the storage medium as described above, as shown in FIG. 3, one of all the ID signal parts serving as the pointers is replaced, The transport packet in which the bitstream to be recorded is transmitted needs to be selected on the channel for the storage medium.

Next, the transmission bit stream with the ID signal portion replaced is input to the encoding circuit 3 and is encoded for recording. After that, in the shuffling circuit 4, the order of recording on the tape-shaped recording medium can be rearranged so as to improve the efficiency of error correction. Next, after the error correction code is added in the ECC circuit 5, 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, the reproduction head 9 (which may also serve as the recording head 7) is used to read a signal from each recording track, and a reproduction signal is obtained through the reproduction amplifier 10. For this reproduced signal, first the ECC circuit 1
The error correction is performed at 1, and the error at the time of recording and reproducing is corrected as much as possible. The signal for which error correction has been completed enters the deshuffling circuit 12.

Thereafter, it 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 television broadcasting. The reproduced bit stream is input to the decoder and is decoded by selecting a channel for the recording medium in the decoder, so that a reproduced screen can be obtained.

It should be noted that the channel for the storage medium may not be the channel dedicated to the storage medium but may be the 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 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 substitution circuit, 28 is an output terminal.

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

The operation of each unit will be described below. First, a transmission bitstream consisting of transport packets of a received television signal is input from the input terminal 15 and input to the encoding circuit 16 to be encoded for recording. Thereafter, the shuffling circuit 17 can rearrange the order of recording. Next, after the error correction code is added by the ECC circuit 18, the recording signal amplified by the recording amplifier 19 is recorded on the tape-shaped recording medium 21 by the recording head 20.

During normal reproduction as well, the reproducing head 22 is similarly operated.
(The recording head 20 may also be used) to read the signal from each recording track, and the reproduction amplifier 23
To obtain a reproduction signal. An error correction is first performed on the reproduced signal by the ECC circuit 24, and errors during recording and reproduction are corrected as much as possible. The error-corrected signal is input to the deshuffling circuit 25, and the order is restored by the reverse operation of the recording.

After that, a bit stream similar to the input transmission bit stream of the television broadcast is obtained by being decoded by the decoding circuit 26. In the second embodiment, a series of ID signal portions, which are next inputted to the ID replacing circuit 27 and represent a broadcasting station, a program, etc., by the same operation as the ID replacing circuit 2 of the first embodiment, are stored in the ID for the storage medium.
It is replaced by the signal part. In this way, the transmission bit stream having the ID signal portion for the storage medium is output from the output terminal 28. The reproduced bit stream is input to the decoder as in the first embodiment, and is decoded by selecting the channel for the recording medium in the decoder, so that the reproduced screen can be obtained.

In each of the first and second embodiments, the ID signal portion representing the broadcasting station, the program, etc. is recorded on the tape-shaped recording medium.
On the recording side, the ID signal portion may be deleted and not recorded, and the ID signal for the storage medium may be added by the ID adding circuit after reproduction.

(Third Embodiment) FIG. 5 is a block diagram showing a video signal recording / reproducing apparatus according to a third embodiment of the present invention. In FIG. 5, 29 is an input terminal, 30 is a PMT, a PID replacement circuit, 31 is an encoding circuit, 32 is a shuffling circuit, and 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 the present embodiment, an ATV is used as an example of the input digital television signal.
Consider a signal according to MPEG2 adopted in. MPEG
In 2, it is possible to multiplex video and audio of various programs (programs) sent from each broadcasting station with transport packets and transmit them.

The operation of each unit will be described below. First, the received transmission bit stream consisting of MPEG2 transport packets is input from the input terminal 29 and input to the PMT and PID replacement circuit 30. The operation here is shown in FIGS. First, referring to FIG.
How to specify a program in is briefly described. As described in the first embodiment, this is shown as a two-stage pointer as described below as the ID signal section.

First, the transport packet ID
The PAT (program association table) included in the packet whose (PID) is 0 is referred to. In this table, a table in which a program number indicating each program and a PID of a transport packet including each PMT (program map table) are associated with each other is described. PMT is an elementary stream of each program (bit stream including video, audio signals, etc.)
The PID of the transport packet that is being transmitted,
It is a table in which information such as PID of a packet including a clock is written. Therefore, the PMT is then referred to, the PID in which each elementary stream of the program is transmitted is obtained, and the video and audio of each program can be obtained.

When actually selecting a channel by the decoder, various programs are selected through such a two-stage pointer. Therefore, by rewriting a part of these pointers and tables, it becomes possible to reproduce with the channel of the decoder fixed regardless of the type of the 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 shows that the PMT of the program x is written in the transport packet whose PID is Mx. Therefore, this Mx
It is preferable to replace the PMT of the program x in the above packet 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 in which the elementary stream of the program x is transmitted is replaced with the PID number portion of the elementary stream of the program number 2 or the like. Good. That is, the PI representing the clock, video, audio, etc. in the PMT of the program x
The numbers such as Exc, Exv, and Exa, which are D, are changed to E2.
c, E2v, E2a, etc. Now, when the channel x is selected by the decoder during the 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 programs is replaced with the information such as the PID of the program to be recorded, not only the channel x but also
Playback images from the VTR can be seen on all channels.

As another example, FIG. 8 shows an example in which the PID is replaced. In FIG. 8, as in the above example, when the channel x is selected on the decoder side, the VTR is selected.
You should be able to see replay images from. At this time, the PID number and Ex of the elementary stream of the program x and the PID of the packet in which the clock is transmitted are designated by the two-stage pointer. Therefore, as shown in FIG. 8, all PIDs in which the elementary stream of the program to be recorded (program 2 in this example) is transmitted are Exc, Exv, and Exa.
It may be recorded by substituting PIDs representing clock, video, audio, etc. of the program x, etc.

In each of the above examples, basically, a reproduced image from a VTR is viewed on an existing channel (channel x in each example), but as shown in FIG.
When one channel is assigned exclusively to the storage medium, it can be similarly realized by changing the PMT and the PID of the storage medium channel (referred to as channel DSM) as in the above-described examples. The program DS in the figure
When playing M, the program DSM is specified to specify the PID in which the video and audio of the program to be recorded are recorded.
Has replaced the PMT of. This is similar to the method shown in FIG. 7, but by adopting the method shown in FIG. 8 in the same manner, the reproduced image from the VTR can be viewed on the channel DSM.

The input signal obtained by replacing a part of the ID signal portion of each recording program as described above is next encoded.
1 is input, and recording coding is performed to a code for actual recording. After that, in the shuffling circuit 32, the recording order can be rearranged. Next, after the error correction code is added in the ECC circuit 33, 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, similarly, the reproduction head 37 (which may also serve as the recording head 35) is used to read a signal from each recording track, and a reproduction signal is obtained through the reproduction amplifier 38. For this reproduction signal, first EC
Error correction is performed by the C circuit 39, and errors during recording and reproduction are corrected as much as possible. The signal for which error correction has been completed enters the deshuffling circuit 40, and an operation reverse to the rearrangement at the time of recording is performed to restore the order.

After that, a bitstream in which the ID signal portion is replaced is obtained in the same manner as the input transmission bitstream of the television broadcast, which is decoded 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 input.
You can get the playback screen by decoding.

In the present embodiment, the substituted I
It is also possible to record the D signal and the like in another portion such as the AUX area on the recording medium, obtain these ID signals at the time of reproduction, and perform the same operation as above.

(Fourth Embodiment) FIG. 10 is a block diagram showing a video signal recording / reproducing apparatus according to a fourth embodiment of the present invention. Figure 10
In 43, 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, and 50 is a recording medium.
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 a PID replacement circuit, and 56 is an output terminal.

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

The operation of each unit will be described below. First, the received transmission bit stream composed of MPEG2 transport packets is input from the input terminal 43 and input to the encoding circuit 44, and the recording encoding is performed to a code for actual recording. After that, the shuffling circuit 45 can rearrange the order of recording. Next, after the error correction code is added by the ECC circuit 46, the recording signal amplified by the recording amplifier 47 is recorded on the tape-shaped recording medium 49 by the recording head 48.

At the time of normal reproduction, similarly, the reproduction head 50 (which may also serve as the recording head 48) is used to read a signal from each recording track, and a reproduction signal is obtained through the reproduction amplifier 51. For this reproduction signal, first EC
Error correction is performed in the C circuit 52, and errors during recording and reproduction are corrected as much as possible. The signal for which error correction has been completed enters the deshuffling circuit 53, and an operation reverse to the rearrangement at the time of recording is performed to restore the order. After that, a bit stream similar to the input transmission bit stream of the television broadcast is obtained by the decoding circuit 54, and is input to the PMT / PID replacement circuit 55.

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

The transmission bit stream having the ID signal portion thus replaced is output from the output terminal 56. This reproduced bit stream is input to the decoder as in the other embodiments, and the channel (program x or program DS) determined for the recording medium by the decoder is input.
It is decoded by selecting (M, etc.), and a reproduction screen can be obtained.

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

(Fifth Embodiment) FIG. 11 is a block diagram showing a video signal recording / reproducing apparatus according to a fifth embodiment of the present invention. Figure 11
, 57 is an input terminal, 58 is an ID separation circuit, a 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
Is a reproduction amplifier, 67 is an ECC circuit, 68 is a deshuffling circuit, 69 is a decoding circuit, 70 is a PAT and PMT addition circuit, and 71 is 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 and deleted so as not to be recorded. ing.

The operation of each unit will be described below. First, the received transmission bitstream consisting of MPEG2 transport packets is input from the input terminal 57 and input to the ID separation / PID replacement circuit 58. Here, the tables that are pointers related to the ID signal part such as PAT and PMT are 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 the PID for the 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, the EC.
Recording is performed on the tape-shaped recording medium 64 by the recording head 63 through the C circuit 61, the recording amplifier 62, and the same processing as in the fourth embodiment.

Also during normal reproduction, the reproduction head 65 (which may also be used as the recording head 63) is used to read signals from the respective recording tracks as in the fourth embodiment, and the reproduction amplifier 66 and the ECC circuit 67 are used. , A deshuffling circuit 68 and a decoding circuit 69, respectively, to obtain a reproduced bit stream, which is input to a PAT / PMT addition circuit 70.

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

The transmission bit stream having the ID signal portion newly added in this way is output from the output terminal 71. This reproduced bit stream is input to the decoder as in the other embodiments, and is decoded by selecting a channel determined for the recording medium by the decoder, so that a reproduced screen can be obtained.

Although all of the above embodiments are described as the video signal recording / reproducing apparatus, the same configuration may be performed by 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, transmission bits sent to the decoder via an optical disk or other storage medium, or a tuner for selecting a channel from another communication channel. The same configuration may be applied to a stream or a transmission bit stream having a similar ID signal part other than MPEG2.

The same operations and processes as those 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, the table or PID relating to the ID signal portion representing the contents of the transmission bit stream at the time of recording or reproduction is replaced, and the transmission bit stream has a bit of a fixed channel. By obtaining a playback bitstream that is a stream, V
It is possible to easily select and decode various programs recorded in a storage medium such as TR in a decoder, and obtain a reproduced image or sound without requiring a complicated operation.

[Brief description of drawings]

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

FIG. 2 is a conceptual diagram showing an ID signal part of a transmission stream recorded / reproduced in one embodiment of the present invention.

FIG. 3 is a conceptual diagram showing an ID signal part of a transmission stream recorded / reproduced in an embodiment of the present invention.

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

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

FIG. 6 is a conceptual diagram showing the operation of the PMT and PID replacement circuit of the third embodiment.

FIG. 7 is a conceptual diagram showing the operation of the PMT and PID replacement circuit of the third embodiment.

FIG. 8 is a conceptual diagram showing the operation of the PMT and PID replacement circuit of the third embodiment.

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

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

FIG. 11 is a block diagram showing 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-shaped recording medium 9 , 22, 37, 50, 65, 80 reproducing head 10, 23, 38, 51, 66, 81 reproducing amplifier 12, 25, 40, 53, 68, 83 deshuffling circuit 13, 26, 41, 54, 69, 84 decoding 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

Front page continued (72) Inventor Mutsuyuki Okayama 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Masazumi Yamada 1006 Kadoma, Kadoma City Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (9)

[Claims] 1. A digital signal transmission packet group having N1 kinds of recognition signals of a first group to an N1th group (N1 is an integer of 1 or more), each of which is composed of a plurality of transmission packets, is multiplexed. In the transmission path that has been transmitted, the transmission packet groups of the first group to the N1th group are set as the first layer, and the transmission packet group of the first layer is formed by combining a plurality of the transmission packet groups into the first layer. Group to form an N2th group (N2 is an integer of 1 or more) of the second layer of transmission packet groups, and the N2 kinds of transmission packet groups of the second layer are formed by combining a plurality of the transmission packet groups into the first group. To the N3th group (N3 is an integer of 1 or more) of the third layer of transmission packets,
Sequentially from the first group to the Nkth layer of the k-th layer (k is an integer of 1 or more)
Groups (Nk is an integer of 1 or more) of Nk types, and the m-th layer (m is an integer of 2 or more and k or less) is included in each transmission packet group of the m-th layer. There are n kinds (n is an integer of 1 or more and N1 or less) of recognition signals from the transmission path through which the transmission packet group including the table group that defines the transmission packet group of the (m-1) th layer using the recognition signal is simultaneously transmitted. In a signal recording / reproducing apparatus for extracting and recording / reproducing a transmission packet group, a part or all of the table group of each layer or a part or all of an identification signal of the transmission packet group to be recorded / reproduced is replaced or added. 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. 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 from a recording medium. The signal recording / reproducing apparatus according to claim 1. 4. A means for deleting a table group of each layer, a means for replacing a part or all of an identification signal of a transmission packet group to be recorded / reproduced, a means for recording / reproducing the transmission packet group, the recording / reproducing. 2. A means for generating a table group for a transmission packet group, and means for connecting the recording / reproducing transmission packet group and the table group generated by the means for generating the table group. Signal recording and reproducing device. 5. Means for sequentially replacing the table groups of the respective layers from the m-th layer (m is an integer of 2 or more and k or less) to the second layer, and the m-th layer is replaced by the table group. A specific definition included in a specific table of a hierarchy is defined so as to indicate a table group of each layer up to the second layer, and the table of the second layer is a part of a transmission packet group to be recorded and reproduced. 4. The signal recording / reproducing apparatus according to claim 1, wherein the respective table groups are replaced so as to be defined so as to indicate all of them. 6. 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 provided, which comprises means for replacing an identification signal of a transmission packet group to be recorded and reproduced. The recording / reproducing is performed by the means for replacing the identification signal so that the table group of each layer up to the second layer is shown and the definition of the table group of the second layer shows the transmission packet group to be recorded / reproduced. 6. The signal recording / reproducing apparatus according to claim 1, wherein the identification signal of the transmission packet group is replaced. 7. The contents of each transmission packet group of a specific layer are:
7. A digital signal which constitutes an independent program consisting of a video signal or an audio signal and is a digital signal.
The signal recording / reproducing apparatus according to any one of 1. 8. A transmission packet group to be recorded and reproduced is composed of three layers (k = 3).
7. 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 contains 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.