JPH07231427A - Compressed television signal processor - Google Patents

Abstract

PURPOSE:To suppress the degradation of picture quality at the time of a superscription and an error when a compressed television signal is recorded and reproduced. CONSTITUTION:A recording circuit arrays the compressed TV signal inputted from a buffer memory on a tape and records the signal. When the difference from the rate of an inputted signal can not be absorbed in a buffer memory because a recording circuit 3 performs recording at a fixed data rate, dummy data is inserted and recording is performed. At this time, a flag showing the starting location and termination location where dummy data is recorded is generated by a dummy data location information setting circuit. This flag is also recorded with the compressed TV signal and the dummy data on the tape. A reproduction circuit reproduces the signal from the tape and the flag showing the dummy data location is taken out by a flag take-out circuit. When this flag exists, the dummy data is eliminated from the reproduced signal and a compressed TV signal is taken out from the reproduced signal by a compressed TV signal take-out circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording / reproducing a compressed audio signal and a compressed video signal (hereinafter referred to as a compressed TV signal) compressed by high-efficiency coding such as an MPEG signal. It is a thing.

[0002]

2. Description of the Related Art In recent years, digital compression coding techniques for video signals have been improved. There is an international standard called MPEG (Moving Picture Expert Group) as a compression encoding system of this kind, and the encoded data of this MPEG video signal is hierarchically constructed as shown in FIG. A sequence indicating the entire image signal is composed of a unit called GOP (Group of Pictures). A GOP is composed of several screens (pictures).

In the GOP, all macroblocks are I
An I picture that is a screen in ntra (intra-screen coding) mode, a P-picture that performs unidirectional predictive coding that predicts only the previous screen for the screen to be coded, and both the previous screen and the subsequent screen Three screen types of B pictures for bidirectional predictive coding for prediction are used.

Each picture is composed of MBS (macroblock slice). This is a one-dimensional structure composed of an arbitrary number of macroblocks.

In the data, there are headers such as sequence headers, GOP headers, picture headers, MBS headers and macroblock headers that indicate the delimiters of each layer. Information for decoding the macroblocks contained in each header is encoded as common information. The data encoded in this way is generally variable length in block units, macroblock units, MBS units, picture units, and GOP units.

In order to transmit such variable-length coded data, the MPEG signal defines a system in which video and audio coded data are integrated and packetized. In the system, the encoded data is first PES (Packetized E
lementaly Stream) in the form of a variable-length packet, and then the PES packet is divided into fixed-length packets called TPs (Transport Packets). The TP also includes auxiliary information for synchronizing audio and video, auxiliary information for identifying multiplexed programs, and the like.

As an apparatus for recording / reproducing encoded data as described above, the data is packetized and recorded for each predetermined number of bits in the order sent from the encoder, and the packet read out at the time of reproduction is recorded. Generally, the data is concatenated and restored to the original data and sent to the decoder.

FIG. 14 shows the structure of a conventional recording / reproducing apparatus. In the figure, 3 is a recording circuit, 4 is a tape, 6 is a reproducing circuit, and 9 is an output circuit.

The operation will be described below. The input compressed TV signal is packetized by the recording circuit 3 and arranged and recorded on the tape 4. The reproducing circuit 6 reproduces the signal from the tape 4 and sends it to the output circuit 9. The output circuit 9 restores the original data array and outputs the reproduced compressed TV signal to the decoder.

[0010]

However, the conventional configuration as described above has a drawback in that a mismatch occurs at the time of overwriting during recording / reproduction.

For example, when an error occurs, the error extends to at least the TP including the error position and the PES including the TP. Conventionally, the TP in the recording packet arranged on the recording medium is Break position, PES
It is difficult to know the delimiter position of, and the range of error cannot be limited. To know the break position,
Operations such as decoding from the beginning are required. Even at the time of overwriting, the position at which overwriting is started has nothing to do with the delimiter position, and a data portion that cannot be decoded and is output disorderly remains on the tape.

Similarly, the sequence in the video signal, G
Since it is not possible to know the division of the hierarchy such as OP and picture, the screen is disturbed by an error or overwriting. M
In an encoding method using inter-picture prediction such as PEG, when the picture that is the basis of prediction is disturbed, the picture quality deteriorates over several subsequent pictures.

Similarly, even when a plurality of programs are multiplexed in the input signal, it is difficult to know the delimiter position, and the influence of an error or overwriting extends over a plurality of programs. Further, for example, the input transmission rate of the input signal and the recording rate of the recording medium are not completely the same, and the input transmission rate may fluctuate depending on the transmission method, and it is difficult to deal with this inconsistency.

In view of the above points, the present invention deals with a rate mismatch when recording and reproducing a compressed television signal,
An object of the present invention is to obtain a compressed television signal processing device capable of suppressing deterioration of image quality even when overwriting or an error occurs.

[0015]

In order to solve the above problems, the compressed television signal processing apparatus of the present invention obtains information on the signal form of a compressed television signal composed of compressed video and audio signals. It is provided with acquisition means and recording means for recording the output of the acquisition means and the compressed television signal.

Further, the compressed television signal processing apparatus of the present invention uses a compressed television signal composed of compressed video and audio signals as an input signal, and calculates the difference between the recording rate of the recording medium and the input transmission rate of the input signal. Recording means for acquiring information about a boundary position between the compressed television signal and the additional signal and a compressed television signal and the additional information and the output of the acquisition means, using a signal of a corresponding rate as the additional signal. And recording means for performing the same.

Further, the compressed television signal processing apparatus of the present invention uses a compressed television signal composed of compressed video and audio signals as an input signal, and relates to a delimiter position of the transmission packet of the input signal in the recording packets of the recording medium. It is provided with acquisition means for acquiring information, and recording means for recording the compressed television signal by arranging the output of the acquisition means at a predetermined position in a recording packet of a recording medium.

Further, the compressed television signal processing apparatus of the present invention uses a compressed television signal containing a compressed image signal as an input signal, and all or part of the delimiter positions for each screen in the compressed image signal. And a recording means for recording the output of the detecting means and the compressed television signal.

Further, the compressed television signal processing device of the present invention uses a compressed television signal containing a compressed image signal as an input signal, and all or part of the delimiter positions for each screen in the compressed image signal. Detection means, an additional signal setting means for setting the arrangement and amount of the additional signal so that the delimiter position is arranged at a predetermined position on the recording medium, and the additional signal and the output of the additional signal setting means. And recording means for recording the compressed television signal.

Further, the compressed television signal processing device of the present invention receives a compressed television signal containing a compressed image signal as an input signal, and outputs a portion of the compressed image signal corresponding to each screen as desired. The apparatus further comprises rearrangement means for rearranging in order, and recording means for recording information regarding the rearrangement order of the rearrangement means and the compressed television signal rearranged by the rearrangement means.

[0021]

According to the present invention, by recording the information regarding the form of the transmission packet of the input signal by the above configuration, the delimiter position of the transmission packet can be easily known, and the influence of error propagation or overwriting can be made within one transmission packet. It becomes possible to suppress.

Particularly, by recording dummy data or the like after the delimiter position, overwriting in packet units or
It is possible to prevent the influence of the error of one recording packet from affecting two or more transmission packets.

Further, by adding a signal having a rate corresponding to the difference between the recording rate of the recording medium and the input transmission rate of the input signal, the recording rate of the recording medium is maintained regardless of the difference and variation with the transmission rate of the input signal. It becomes possible to record according to the above, and by recording the information on the boundary position between the input signal and the additional signal, it is possible to know the position of the additional signal during reproduction and easily separate the additional signal and the input signal. .

By recording the screen delimiter position in the video signal, the influence of error propagation and overwriting can be suppressed within one screen. Particularly, by recording the start position and end position of the I picture, or by filling the portion other than the portion occupied by the I picture data with dummy data in units such as a recording packet or a track, for high speed reproduction and still image transmission. It is useful because it can cut out the compressed part by intra-frame coding.

Also, by recording the start position of the I picture or P picture following the B picture, or by filling the start position with dummy data so that the start position is the start position of a recording packet or a track, the code remaining at the time of overwriting The image is not disturbed by the encoded data and can be reproduced correctly.

Further, even when a plurality of programs are multiplexed in the input signal, by recording the delimiter position,
It is possible to prevent the influence of an error or overwriting from extending over multiple programs.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a compressed television signal processing apparatus according to the first embodiment of the present invention. In the figure, 1 is a system controller, 2 is a buffer memory, 3 is a recording circuit, 4 is a tape, 5 is a dummy data position information setting circuit, 6 is a reproducing circuit, 7 is a flag extracting circuit, and 8 is a compressed TV signal extracting circuit. , 9 are output circuits.

The operation during recording will be described below. The input compressed TV signal is sent to the buffer memory 2. The system controller 1 obtains the average data rate from the compressed TV input signal. For example, in the MPEG signal, the information about the number of programs multiplexed in the data and the data rate of each program is described in the header part of the packet, so that it should be read. Further, the system controller 1 measures the data rate of the input signal at that moment by the change in the inflow amount into the buffer memory 2 or the accumulation amount in the buffer memory 2.

The recording circuit 3 arranges and records the compressed TV signal input from the buffer memory 2 on the tape 4. Since the recording circuit 2 records at a constant data rate, dummy data is inserted and recorded when the difference from the rate of the input signal cannot be absorbed by the buffer memory 2. On this occasion,
The dummy data position information setting circuit 5 generates a flag indicating a start position and an end position where the dummy data is recorded, and this flag is also recorded on the tape 4 together with the compressed TV signal and the dummy data.

By the above operation, in addition to the input compressed TV signal, dummy data and a flag indicating the position of the dummy data are recorded on the tape 4.

Next, the operation during reproduction will be described. The reproducing circuit 6 reproduces a signal from the tape 4. The flag extracting circuit 7 extracts a flag indicating the dummy data position. When the flag exists, the dummy data is removed from the reproduced signal, and the compressed TV signal extracting circuit 8 extracts the compressed TV signal from the reproduced signal. Then, the extracted compressed TV signal is sent to the output circuit 9. The output circuit 9 restores the original data array and outputs the reproduced compressed TV signal to the decoder.

With the above configuration, by adding dummy data having a rate corresponding to the difference between the recording rate of the recording medium and the input transmission rate of the input signal, the recording is performed regardless of the difference and variation with the transmission rate of the input signal. It becomes possible to record according to the recording rate of the medium, and by recording the information on the boundary position between the input signal and the additional signal,
It is easy to know the position of the dummy data during reproduction and separate the input signal for reproduction.

In the present embodiment, the information regarding the number of multiplexing and the data rate of each program is read from the header portion of the packet, and the amount of inflow into the buffer memory 2 or the amount of storage in the buffer memory 2 changes, so that It was assumed that the data rate of the input signal at the moment was measured, but this is measured when the buffer memory is configured to add dummy data corresponding to the difference in the rate so that the buffer memory always outputs at a constant rate. The operations such as are unnecessary.

FIG. 2 shows a block diagram of a compressed television signal processing apparatus according to the second embodiment of the present invention. In FIG. 2, 1 is a system controller, 2 is a buffer memory, 3 is a recording circuit, 4 is a tape, 11 is a packet information acquisition circuit, 6 is a reproduction circuit, 12 is a flag extraction circuit, 1
3 is an error packet display, 8 is a compressed TV signal extraction circuit, and 9 is an output circuit.

The operation during recording will be described below. The input compressed TV signal is sent to the buffer memory 2. The packet information acquisition circuit 11 uses the external information indicating the currently connected device and its connection point, the external information about the signal to be recorded, or the information in the packet header of the input signal to determine the transmission packet of the input signal. Get information about.
For example, in the case of an MPEG signal, information about whether the packet is TP or PES, the size of the transmission packet and the size of the header, and the type of data in the transmission packet is obtained.

The recording circuit 3 arranges and records the compressed TV signals input from the buffer memory 2 on the tape 4. At this time, the output from the packet information acquisition circuit 5 is also the compressed TV.
It is recorded on the tape 4 together with the signal.

By the above operation, in addition to the input compressed TV signal, flags indicating the type and size of the transmission packet are recorded on the tape 4. Note that FIG. 3 illustrates the relationship between the obtained transmission packet and recording packet.

Next, the operation during reproduction will be described. The reproducing circuit 6 reproduces a signal from the tape 4. Flag retrieval circuit 12
Thus, the flag indicating the packet information is extracted. Also,
The compressed TV signal extracting circuit 8 compresses T from the reproduced signal.
Extract V signal.

Here, when an error occurs in a part of the recording data, since the packet type and size can be known from the packet information, the error packet indicator 13 causes an error as shown in FIG. It can be determined in which transmission packet the part is located, and a flag indicating that it is an erroneous packet is set in the header of the transmission packet containing the part in which the error occurred. As a result, the erroneous packet can be discriminated at the time of recording / reproduction on the decoder side after output. Further, in the conventional example, since the boundary of the transmission packet is not known, the range of influence of the error becomes large, but according to the present embodiment, the error does not affect other than the transmission packet.

Next, the extracted compressed TV signal is sent to the output circuit 9. The output circuit 9 restores the original data array and outputs the reproduced compressed TV signal to the decoder.

In this embodiment, by recording the information regarding the form of the transmission packet of the input signal with the above-mentioned configuration, the delimiter position of the transmission packet can be easily known.
It is possible to suppress the influence of error propagation and overwriting within one transmission packet.

FIG. 4 is a diagram illustrating the relationship between transmission packets and recording packets for explaining the third embodiment of the present invention. Compared to FIG. 3, by recording the dummy data after the delimiter position, the head of each transmission packet is always located in the recording packet, which makes it easier to determine the delimiter of the transmission packet. Also, as in the second embodiment, the decoder side after output can discriminate an erroneous packet at the time of recording and reproducing, and the error does not affect other than the packet.

Further, when the overwriting is possible on a recording packet basis, it is possible to set so that the transmission packet is completed in the recording packet at the boundary portion of the overwriting, so that the reproduced signal after the overwriting is disturbed. There is no.

As described above, by recording the dummy data or the like after the delimiter position, it is possible to prevent the influence of overwriting of one recording packet and the influence of an error on two or more transmission packets.

FIG. 5 shows a block diagram of a compressed television signal processing apparatus according to the fourth embodiment of the present invention. In FIG. 5, 1 is a system controller, 2 is a buffer memory, 3 is a recording circuit, 4 is a tape, 21 is a screen division information acquisition circuit, 6 is a reproduction circuit, 22 is a flag extraction circuit,
Reference numeral 8 is a compressed TV signal extracting circuit, and 9 is an output circuit.

The operation during recording will be described below. The input compressed TV signal is sent to the buffer memory 2. The screen break information acquisition circuit 21 obtains information about a screen break in the compressed image information of the input signal. For example, in the case of an MPEG signal, a screen boundary can be detected by reading a sequence header, a GOP header, a picture header, or the like.

The recording circuit 3 arranges and records the compressed TV signal input from the buffer memory 2 on the tape 4. At this time, the output from the screen division information acquisition circuit 21 is also the compressed T
It is recorded on the tape 4 together with the V signal.

By the above operation, in addition to the input compressed TV signal, the flags indicating the type and position of the screen division are recorded on the tape 4. FIG. 6 illustrates the relationship between image signals and recording tracks. Here, it is assumed that the start position of the I picture part, that is, the position at the beginning of the GOP and the end position of the I picture part are recorded as the screen division information.

Next, the operation during reproduction will be described. The reproducing circuit 6 reproduces a signal from the tape 4. Flag extraction circuit 22
By this, a flag indicating the delimiter position information is extracted. The compressed TV signal extracting circuit 8 extracts the compressed TV signal from the reproduced signal. Next, the extracted compressed TV signal is sent to the output circuit 9. The output circuit 9 restores the original data array and outputs the reproduced compressed TV signal to the decoder.

In the case of overwriting, if data is overwritten after the recorded end position, the data can be connected in screen units at an extra boundary. Further, it is possible to cut out a portion compressed by intra-picture coding for still image transmission.

In the fourth embodiment, an example of recording the delimiter position of the I picture is shown, but this may be information of the delimiter position of other screens. In particular, as shown in FIG. 7 as the fifth embodiment, since the start position of the I picture or P picture following the B picture is the delimiter of the portion where bidirectional prediction is not performed, the data after that is overwritten. Even if it is rewritten by, the screen is effective because it is not disturbed by the previous data.

As a second method of realizing the fifth embodiment, when a part of the GOP of the input signal is of a type called a closed GOP, that is, the GOP shown in FIG.
If there is no screen such as (n) and GOP (n + 1) that is affected by bidirectional prediction between two GOPs, the same configuration as in FIG. Can be enabled. Here, the system controller 1 selects the GO from the input image signal.
A code indicating whether P is a closed GOP, or a code indicating that the delimiter position of the GOP is an editable insertion point or a discontinuous point, for example, a discontinuity_indicator flag in the transmission packet header of the MPEG system, splice_countodown The flag is read, the closed position information is sent to the recording circuit 3 according to the determined position,
Record.

As described above, when overwriting is started and ended at the closed GOP position, the image is not disturbed because there is no correlation with the previous GOP.

FIG. 8 shows the relationship between the image signal and the recording track for explaining the sixth embodiment. Compared to FIG. 6, by recording the dummy data after the delimiter position, the start position of the GOP is always located in the recording packet, so that it becomes easier to determine the delimiter position of the GOP. Further, it is effective that the screen can be correctly reproduced even when the head of the track is overwritten, which is relatively easy to realize, and the screen is not disturbed.

FIG. 9 shows the relationship between the image signal and the recording track for explaining the seventh embodiment. As in the sixth embodiment, as compared with FIG. 7, by recording dummy data after the delimiter position, the delimiter position of the portion where bidirectional prediction is not performed is always located at the beginning of the recording track. Further, the judgment becomes easier. Further, even if the track head is overwritten relatively easily, it is effective without disturbing the screen due to the data of the previous track.

As another method of realizing the seventh embodiment, when a part of the GOP of the input signal is of a type called a closed GOP, that is, GOP (n) shown in FIG.
If there is no screen that is affected by bidirectional prediction between two GOPs, such as GOP (n + 1) and GOP (n + 1), the same configuration as in FIG. is there. Here, as in the second implementation method of the fifth embodiment, the system controller 1 can edit and insert the code indicating whether the GOP is a closed GOP from the input image signal or the delimiter position of the GOP. , The code indicating the discontinuous points is read, and the dummy data is recorded after the closed position according to the determined position, so that the start position of the GOP is always located in the recording packet. It becomes easy to determine the break position. In addition, it is effective that the screen can be reproduced correctly without being disturbed even by overwriting the head of the track, which is relatively easy to realize.

In the fourth, fifth, sixth and seventh embodiments, the dummy data is recorded in track units, but other units may be used. In particular, when error correction or rearrangement is performed over a plurality of tracks at the time of recording, it is preferable to match the dummy data so that the head positions are matched in units of the number of tracks. Moreover, although the delimiter position in the screen unit is detected, this may be another unit such as GOP, sequence, MBS, or macroblock.

FIG. 10 shows a block diagram of a compressed television signal processing apparatus according to the eighth embodiment of the present invention. Figure 1
In 0, 1 is a system controller, 2 is a buffer memory, 3 is a recording circuit, 4 is a tape, 31 is a multiplexed program division information acquisition circuit, 6 is a reproduction circuit, 32 is a flag extraction circuit, and 8 is a compressed TV signal extraction circuit. , 33
Is an output circuit.

The operation during recording will be described below. The input compressed TV signal is sent to the buffer memory 2. The multiplexed program delimiter information acquisition circuit 31 obtains information about the delimiter of the part indicating each program in the input signal in which a plurality of programs are multiplexed. For example, in the case of an MPEG signal, the transmission packet includes a flag indicating an identification number indicating the number of the program for which the information is transmitted. A packet having a special identification number carries information about program multiplexing. By reading these pieces of information in the multiplexed program delimiter information acquisition circuit 31, it is possible to detect the delimiter of the information of each program.

The recording circuit 3 arranges and records the compressed TV signals input from the buffer memory 2 on the tape 4. At this time, the output from the multiplexed program segment information acquisition circuit 31 is also recorded on the tape 4 together with the previous compressed TV signal.

By the above-mentioned operation, in addition to the input compressed TV signal, a flag indicating the position of the delimiter of the part of the information relating to the multiplexed program and the identification number of the delimited part is recorded on the tape 4. . FIG. 11 illustrates the relationship between such a multiplexed input signal and recording tracks.

Next, the operation during reproduction will be described. The reproducing circuit 6 reproduces a signal from the tape 4. Flag extraction circuit 32
By this, a flag indicating the delimiter position information is extracted. The compressed TV signal extracting circuit 8 extracts the compressed TV signal from the reproduced signal. Next, the extracted compressed TV signal is sent to the output circuit 33. The output circuit 33 restores the original data array and outputs the reproduced compressed TV signal to the decoder.

In addition, the output circuit 33 can select and output one program or a program having a multiplex number smaller than the original multiplex number among the multiplexed programs. When the number of programs to be output by the system controller 1 and the identification number of the program are determined, the output circuit 33 selects and arranges the corresponding data among the recorded parts and outputs the selected data.

FIG. 12 shows a block diagram of a compressed television signal processing apparatus according to the ninth embodiment of the present invention. Figure 1
In FIG. 2, 1 is a system controller, 2 is a buffer memory, 3 is a recording circuit, 4 is a tape, 41 is a screen division information acquisition circuit, 42 and 45 are data output controllers, 6 is a reproduction circuit, 43 is a flag extraction circuit, Reference numeral 8 is a compressed TV signal extracting circuit, and 44 is an output circuit.

The operation during recording will be described below. The input compressed TV signal is sent to the buffer memory 2. The screen break information acquisition circuit 41 obtains information about a screen break in the compressed image information of the input signal. The data output controller 42 rearranges the data according to the delimiter information, for example, as shown in FIG. 13, and causes the buffer memory 2 to output the data to the recording circuit 3.

The recording circuit 3 arranges and records the compressed TV signal input from the buffer memory 2 on the tape 4. At this time, the outputs from the screen division information acquisition circuit 41 and the data output controller 42 are also recorded on the tape 4 together with the compressed TV signal.

By the above-described operation, in addition to the input compressed TV signal, flags indicating the type, position, rearrangement arrangement of screen divisions, etc. are recorded on the tape 4.

Next, the operation during reproduction will be described. The reproducing circuit 6 reproduces a signal from the tape 4. Flag extraction circuit 43
By this, a flag indicating the delimiter position and rearrangement information is extracted. The compressed TV signal extracting circuit 8 extracts the compressed TV signal from the reproduced signal. Next, the extracted compressed TV signal is sent to the output circuit 44. The output circuit 44 restores the original data array and outputs the reproduced compressed TV signal to the decoder. At this time, using the delimiter position and rearrangement information, the data output controller 45 performs rearrangement opposite to that rearranged at the time of recording, and returns the data array at the time of input to output.

[0070]

As is apparent from the above description, according to the compressed television signal processing apparatus of the present invention, the delimiter information of the input signal is recorded together with the compressed recording signal, so that the input is made at the time of recording / reproducing. Even when a part of the signal is disturbed by an error, the part affected by the error can be suppressed in the vicinity of the boundary, and the image quality deterioration due to the error can be suppressed to the minimum. In particular, in the unit of a recording packet or track of a recording medium, by filling dummy data after the delimiter position of the transmission packet, GOP, etc. in the input signal, the leading position of the delimiter of the next input signal is set to the leading screen of the recording unit Can be placed,
It becomes easier to detect the start position. In addition, it becomes possible to minimize the influence of overwriting.

[Brief description of drawings]

FIG. 1 is a block diagram of a compressed television signal processing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a compressed television signal processing device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between a transmission packet and a recording packet in the second embodiment of the present invention.

FIG. 4 is a diagram showing a relationship between a transmission packet and a recording packet in the third embodiment of the present invention.

FIG. 5 is a block diagram of a compressed television signal processing device according to a fourth embodiment of the present invention.

FIG. 6 is a diagram showing the relationship between image signals and recording tracks in the fourth embodiment of the present invention.

FIG. 7 is a diagram showing the relationship between image signals and recording tracks in the fifth embodiment of the present invention.

FIG. 8 is a diagram showing the relationship between image signals and recording tracks in the sixth embodiment of the present invention.

FIG. 9 is a diagram showing the relationship between image signals and recording tracks in the seventh embodiment of the present invention.

FIG. 10 is a block diagram of a compressed television signal processing device according to an eighth embodiment of the present invention.

FIG. 11 is a diagram showing the relationship between multiplexed input signals and recording tracks in the eighth embodiment of the present invention.

FIG. 12 is a block diagram of a compressed television signal processing device according to a ninth embodiment of the present invention.

FIG. 13 is a diagram showing rearrangement of data in the ninth embodiment of the present invention.

FIG. 14 is a block diagram of a conventional processing device.

FIG. 15 is a diagram showing an example of an encoded signal having a hierarchical data structure such as an MPEG signal.

FIG. 16 is a diagram showing a relationship between an image signal and a recording track for explaining a second realizing method of the fifth embodiment and a second realizing method of the seventh embodiment of the present invention.

[Explanation of symbols]

 1 System Controller 2 Buffer Memory 3 Recording Circuit 4 Tape 5 Dummy Day Contrast Information Setting Circuit 6 Playback Circuit 7, 12, 22, 32 Flag Extraction Circuit 8 Compressed TV Signal Extraction Circuit 9, 33, 44 Output Circuit 11 Packet Information Acquisition Circuit 13 Error Packet display 21, 41 Screen break information acquisition circuit 31 Multiplex program break information acquisition circuit 42, 45 Data output controller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04N 7/13 A

Claims (20)

[Claims] 1. Acquisition means for acquiring information about the signal form of a compressed television signal consisting of compressed video and audio signals, and recording means for recording the output of the acquisition means and the compressed television signal. A compressed television signal processing device, comprising: 2. The compressed television signal processing apparatus according to claim 1, wherein the acquisition means acquires information about an input transmission rate of the compressed television signal. 3. The compressed television signal processing apparatus according to claim 1, wherein the obtaining means obtains information about the effective data length in the packet of the compressed television signal and the structure of the header portion of the packet. . 4. The compressed television according to claim 1, wherein the acquisition means acquires a part or all of the information about the number of multiplexed programs in the compressed television signal and the code for identifying each program. Signal processing device. 5. A compressed television signal composed of compressed video and audio signals is used as an input signal, and a signal having a rate corresponding to a difference between a recording rate of a recording medium and an input transmission rate of the input signal is used as an additional signal. An acquisition means for acquiring information about a boundary position between a compressed television signal and the additional signal, and a recording means for recording the compressed television signal and the additional information and an output of the acquisition means are provided. Compressed television signal processing device. 6. An acquisition means for acquiring, as an input signal, a compressed television signal composed of a compressed video and audio signal and acquiring information regarding a delimiter position of a transmission packet of the input signal in a recording packet of the recording medium, and a recording medium. A compressed television signal processing device, comprising: a recording means for arranging the output of the acquisition means at a predetermined position in a recording packet to record the compressed television signal. 7. Information indicating whether the data immediately following the position of the delimiter of the transmission packet is the data of the transmission packet to be transmitted immediately after or the additional data other than that is provided as second predetermined information in the recording packet of the recording medium. The compressed television signal processing device according to claim 5, wherein the compressed television signal processing device is arranged and recorded at a position. 8. A detection means for detecting all or a part of the delimiter positions for each screen in the compressed image signal, using a compressed television signal containing the compressed image signal as an input signal. A compressed television signal processing device comprising: an output and a recording means for recording the compressed television signal. 9. A compressed television signal in which a plurality of programs are multiplexed is used as an input signal, and a detection means detects a delimiter position of a portion showing information of different programs in the compressed television signal. The compressed television signal processing device according to claim 8. 10. A compressed television signal containing an image signal compressed by intra-picture coding and inter-picture predictive coding is used as an input signal, and a detection means is compressed by intra-picture coding of the compressed image signal. 9. The compressed television signal processing device according to claim 8, wherein at least one of a start position and an end position of the opened portion is detected. 11. An image signal compressed by intra-picture coding, unidirectional predictive coding for predicting only from a previous screen, and bidirectional predictive coding for predicting from both a previous screen and a subsequent screen. Compressed television signal as input signal,
9. The compressed television signal processing apparatus according to claim 8, wherein the detecting means detects an end position of a portion of the compressed image signal which is compressed by bidirectional predictive coding. 12. A compressed television signal including an image signal compressed by intra-picture coding and inter-picture predictive coding is used as an input signal, and a detection means compresses the intra-picture coding of the compressed image signal. 9. The compressed television signal processing device according to claim 8, wherein a start position of a closed intra-frame encoded portion, which is a portion that is not used for previous prediction, is detected. 13. An editing / insertion defined by information in the compressed image signal, wherein a compressed television signal containing an image signal compressed by intra-frame coding and inter-frame predictive coding is used as an input signal. 9. The compressed television signal processing device according to claim 8, wherein a possible position is detected. 14. A detection means for detecting all or a part of delimiter positions for each screen in the compressed image signal, using a compressed television signal containing a compressed image signal as an input signal, and the delimiter position Additional signal setting means for setting the arrangement and amount of the additional signal so as to be arranged at a predetermined position on the recording medium, and recording for recording the additional signal, the output of the additional signal setting means and the compressed television signal. A compressed television signal processing device, comprising: 15. A compressed television signal containing an image signal compressed by intra-picture coding and inter-picture predictive coding is used as an input signal, and a detection means is compressed by intra-picture coding of the compressed image signal. 15. The compressed television signal processing device according to claim 14, wherein the start position of the opened portion is detected. 16. An image signal compressed by intra-picture coding, unidirectional predictive coding for predicting only from a previous screen, and bidirectional predictive coding for predicting from both a previous screen and a subsequent screen. Compressed television signal as input signal,
15. The compressed television signal processing apparatus according to claim 14, wherein the detecting means detects a start position of a part of the compressed image signal that follows the end position of the part compressed by bidirectional predictive coding. 17. A compressed television signal including an image signal compressed by intra-picture coding and inter-picture predictive coding is used as an input signal, and a detection means compresses the intra-picture coding of the compressed image signal. 15. The compressed television signal processing apparatus according to claim 14, wherein a start position of a closed intra-frame encoded portion, which is a portion that is not used for previous prediction, is detected. 18. An editing / insertion defined by information in the compressed image signal, wherein a compressed television signal containing an image signal compressed by intra-picture coding and inter-picture predictive coding is used as an input signal. 15. The compressed television signal processing device according to claim 14, wherein a possible position is detected. 19. A rearrangement means for rearranging portions of the compressed image signal corresponding to respective screens in a desired order, using a compressed television signal containing a compressed image signal as an input signal, and the arrangement. A compressed television signal processing device, comprising: recording means for recording information regarding a rearrangement order of the changing means and a compressed television signal rearranged by the rearranging means. 20. An image signal compressed by intra-picture coding, unidirectional predictive coding for predicting only from a previous screen, and bidirectional predictive coding for predicting from both a previous screen and a subsequent screen. Compressed television signal as input signal,
The rearrangement means rearranges, in the desired order, a portion of the compressed image signal that has been compressed by intra-picture encoding, a portion that has been compressed by unidirectional encoding, and a portion that has been compressed by bidirectional predictive encoding. 20. The compressed television signal processing device according to claim 19.