JP2001231008A - Compressed signal recorder, compressed signal recording method and compressed signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of a conventional recorder recording on plural tracks for one data format that cannot edit a recorded video signal when recording the video signal subjected to inter-frame compression. SOLUTION: An encoder 1 applies compression to an incoming video signal and a buffer 2 stores the compressed video signal. A CPU 4 generates a read pulse (d) on the basis of track sequence information (c) outputted from a recording and reproducing section 3 and an inverted pulse (b) outputted from the encoder 1. Reading of the compressed signal stored in the buffer 2 is started in timing of the read pulse (d) and the read signal is stored by the recording and reproducing section 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed signal recording apparatus, a compressed signal recording method, and a compressed signal recording / reproducing apparatus for recording a video signal subjected to inter-frame compression on a magnetic tape.

[0002]

2. Description of the Related Art In recent years, with the digitization of television broadcasting by digital satellite broadcasting or the like, digitization of video and audio signals has been rapidly progressing. Under such circumstances, a magnetic recording / reproducing apparatus capable of recording / reproducing a digital video / audio signal in a digital signal form has been developed and commercialized.

[0003] As one of such magnetic recording / reproducing devices, D
There is a VHS (registered trademark) recording and reproducing apparatus. The D-VHS recording / reproducing apparatus is capable of recording / reproducing a digital video signal by using a mechanism system of a VHS (registered trademark) recording / reproducing apparatus which is widely used as an analog video tape recorder. And VH
In addition to recording and reproducing analog video and audio signals based on the S system, digital video signals and digital audio signals encoded by the MPEG (Moving Picture Experts Group) 2 system are recorded and reproduced in the form of a bit stream based on the MPEG transport stream standard. You can also.

Some D-VHS recording / reproducing apparatuses have a built-in encoder and decoder, and encode an incoming analog video / audio signal into a MPEG2-compressed signal in accordance with the bit rate of a recording mode. And
At the time of reproduction, MPEG2 reproduced from a magnetic tape
There are some which can decode a compressed signal of the system and output it as an analog video / audio signal.

[0005] In the compression coding of the MPEG2 system, generally, a video signal of 15 frames is subjected to inter-frame compression as a delimiter of one compression coding process, that is, a GOP (Group of Pictures). Unless picture data is obtained, all video signals for 15 frames cannot be restored.

On the other hand, a D-VHS recording / reproducing apparatus is a so-called helical scan type recording / reproducing apparatus for recording / reproducing information signals using a plurality of rotating magnetic heads mounted on a rotating drum. Is recorded as a single data format on a plurality of inclined tracks on a magnetic tape. That is, since one data format is formed in units of the plurality of inclined tracks, even when reproducing a signal from the magnetic tape, the recorded video signal is restored unless the signal is reproduced in units of the plurality of inclined tracks. Can not do.

[0007]

As described above, in the recording apparatus, the encoder compresses the input signal at the encode rate corresponding to the recording mode, and the signal recording section converts the compressed signal which has been encoded into the plurality of inclined tracks. GO in units
Since recording is performed irrespective of the break of P, the break of GOP in the compressed signal does not match the break of the plurality of inclined tracks.

[0008] In other words, since the head of the GOP in the compressed signal recorded on the magnetic tape is not recorded in the head of the data format, a new compressed signal is rewritten from the middle of the compressed signal recorded on the magnetic tape. There is a problem that editing work such as connection recording cannot be performed.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a compressed signal recording apparatus according to the present invention compresses and encodes a video signal of a predetermined number of frames in one compression unit, and records a series of video signals to be recorded. Encoding means (1) for outputting a signal as compressed data; and s (s) (s) when recording the compressed data compressed and encoded by the encoding means (1) while sequentially forming a plurality of inclined tracks on a magnetic tape. s is an integer of 2 or more), and the compressed data of the compression unit is recorded on t inclined tracks in one data format, and s and t of the inclined tracks are recorded. Recording means (3) for recording the edit point information for each inclined track corresponding to the least common multiple of.

[0010] In the compressed signal recording device, a buffer means (2) for temporarily storing the compressed data output from the encoding means (1) to the recording means (3).
Wherein the buffer means (2) outputs the compressed data of the compression unit in synchronization with the recording timing of the edit point information.

In the compressed signal recording apparatus, the recording means (3) can record the compressed data in one of a plurality of recording modes having different recording bit rates, and the encoding means (1) ) Is characterized in that the bit rate of the output compressed data can be changed according to the recording mode at the time of recording.

[0012] Also, in the compressed signal recording method according to the present invention, a plurality of inclined tracks are sequentially recorded on a magnetic tape by compressing and encoding a predetermined frame of a series of video signals to be recorded as one compression unit. When recording while forming compressed data, the compressed data for s (s is an integer of 2 or more) inclined tracks is used as one data format, and the compressed data for the compression unit is recorded on t inclined tracks.
In addition, edit point information is recorded for each inclined track corresponding to the least common multiple of s and t of the inclined tracks.

[0013] Further, a compressed signal recording / reproducing apparatus according to the present invention comprises:
Encoding means (1) for compressing and encoding a video signal of a predetermined number of frames in one compression unit and outputting a series of video signals to be recorded as compressed data, and compressing and compressing the compressed data by the encoding means (1). When recording while sequentially forming a plurality of inclined tracks on a magnetic tape,
Compressed data for s (s is an integer of 2 or more) inclined tracks is used as one data format, and compressed data for the compression unit is recorded on t inclined tracks. recording means (3) for recording edit point information for each inclined track corresponding to the number of least common multiples of t, and reproducing the compressed data recorded on the magnetic tape by the recording means (3); Reproducing means (3) for reproducing point information; and the reproducing means (3)
Decoding means (5) for performing a decompression process on the reproduced compressed data to restore the series of video signals, and the magnetic tape based on the edit point information reproduced by the reproducing means (3). , So that the compressed data can be rewritten after an arbitrary editing point.

[0014]

FIG. 1 is a block diagram for explaining a compressed signal recording apparatus and a compressed signal recording / reproducing apparatus according to the present invention. Hereinafter, a compressed signal recording apparatus and a compressed signal recording / reproducing apparatus according to the present invention will be described. An example in which the apparatus is applied to a D-VHS recording / reproducing apparatus will be described.

In FIG. 1, reference numeral 1 denotes an encoder to which a video signal which is input from the outside in the form of an analog video signal and is converted into a digital signal by an A / D converter (not shown) is supplied. The video signal is subjected to MPEG2 compression encoding and output.

Here, the encoding rate in the encoder 1
That is, the bit rate of the output signal is set by the recording mode signal output from the CPU 4, and the encoder 1
When outputting a compressed signal a that has been compression-encoded by the MPEG2 system, the CPU 4 outputs to the CPU 4 an inversion pulse b indicating a break of a GOP forming the compressed signal a. Also, the encoder 1 has MP
Since compression coding is performed in a closed format when performing EG2 compression coding, if all compressed signals forming a GOP are obtained, a video signal can be restored without the compressed signals of the preceding and following GOPs.

On the other hand, 2 is a compressed signal a output from the encoder 1
Is temporarily stored. At the timing of a read pulse d from the CPU 4, reading is started from data at the head of a data block forming an editing unit.
3 formats the read data e output from the buffer 2 into a signal form based on the D-VHS standard,
This is a recording / reproducing unit that records this on an inclined track on a magnetic tape.

At this time, the recording / reproducing unit 3 outputs to the CPU 4 track sequence information c indicating the sequence of the inclined tracks formed on the magnetic tape,
4 outputs capstan type servo information to the recording / reproducing unit 3 in order to control the tape running speed of the magnetic tape in the recording / reproducing unit 3.

Reference numeral 5 denotes a decoder for subjecting a reproduced signal output from the recording / reproducing unit 3 to decompression processing according to the MPEG2 system. Reference numeral 6 denotes an OSD (On Screen) for adding on-screen information to a video signal output from the decoder 5 and outputting the video signal. Display), 7 receives a user's instruction, and transmits this information to the CPU 4 and OSD.
6 is a GUI (Graphical User Interface) to be transmitted to the G.6.

Hereinafter, the operation of the compressed signal recording device and the compressed signal recording / reproducing device according to the present invention will be described. First, when recording a video signal on a magnetic tape, a user determines a recording mode prior to the recording. Here, as the recording mode, an STD mode, an LS3 mode, an LS5 mode, or the like can be selected. In the STD mode, the recording / reproducing section 3 can record and reproduce an information signal of 14.1 Mbps, and in the LS3 mode, a recording rate of 4.7 Mbps. Can be recorded and reproduced, and in the LS5 mode, a 2.8 Mbps information signal can be recorded and reproduced.

The recording / reproducing unit 3 alternately uses two rotating magnetic heads mounted on the rotating drum so as to be substantially 180 degrees opposite to each other, and forms read data e read from the buffer 2 while forming an inclined track. Recording is performed, but the rotation speed of the rotary drum is kept the same between the recording modes. In contrast,
The running speed of the magnetic tape is controlled to 1/3 times in the LS3 mode as compared with the STD mode, and in the LS5 mode,
It is controlled to be 1/5 times that of the D mode.

[0022] In the STD mode, the rotating drum is 18
While the signal is recorded while forming one inclined track every 0 degree, that is, every 1/2 rotation, in the LS3 mode, the signal is recorded when the rotating drum rotates 1.5 times, which is three times 180 degrees. A recording current is applied to the magnetic head by 1/2 rotation to form one inclined track. In the LS5 mode, the magnetic head is rotated by 1/2 rotation when the rotating drum makes 2.5 rotations, which is five times 180 degrees. The recording pitch is matched between the recording modes by forming a single inclined track by supplying a recording current to the recording medium.

At the same time as recording an information signal on such an inclined track, a control pulse is recorded while forming a control track in the longitudinal direction of the magnetic tape. In each recording mode, this control pulse is recorded at 30 Hz. I do. Therefore, at the time of reproduction, the reproduction control pulse reproduced from the control track is 30H
By controlling the tape running speed so as to be z, the information signal can be reproduced from the inclined track recorded on the magnetic tape.

FIG. 2 is a diagram for explaining a recording operation of a video signal in the STD mode of the compressed signal recording device and the compressed signal recording / reproducing device according to the present invention. The compressed signal, b, is
The inverted pulse to be output to U4, c is the
4, d indicates a read pulse output from the CPU 4 to the buffer 2, and e indicates read data output from the buffer 2 to the recording / reproducing unit 2.

[0025] The user sets the recording mode to ST by using the GUI 7.
When the D mode is selected and a recording start instruction is given, the CPU
No. 4 sets the encoding rate of the encoder 1 to 14.1 Mbp.
The value is set to a value corresponding to the recording rate of s, and the encoder 1 compression-codes the incoming video signal.

The encoder 1 outputs the compressed signal a, which has been subjected to the compression encoding process, to the buffer 2, and outputs an inverted pulse b, which is inverted at a GOP break in the compressed signal a, to C.
Output to PU4. The compressed signal a output from the encoder 1 is sequentially stored in the buffer 2, and reading is started from the data at the head of the data block forming the editing unit at the timing of the read pulse d from the CPU 4.

Here, the data block constituting the editing unit is
The size is set differently for each recording mode, and FIG. 3 is a diagram showing the size of a data block forming an editing unit in each recording mode. One GOP is generally 15
The picture data of one GOP is composed of 30 inclined tracks in STD mode,
Recording is performed on ten inclined tracks in the LS3 mode and on six inclined tracks in the LS5 mode.

On the other hand, the number of tracks constituting the data format of the D-VHS is 6, the number of tracks required to record one GOP is t, and the number of tracks constituting the data format is s. In this case, the size of the data block constituting the editing unit is determined by the number of tracks of the least common multiple of t and s.

[0029] Therefore, in the STD mode, 30 inclined tracks which are the least common multiple of 30 and 6, ie, 1 GOP (5
(Data format) is a data block forming an editing unit, and in the LS3 mode, a 30-slope track, which is the least common multiple of 10 and 6, that is, a 3GOP (5 data format) is a data block forming an editing unit.
In the LS5 mode, a 6-slope track, which is the least common multiple of 6 and 6, ie, 1 GOP (1 data format)
Is a data block forming an editing unit.

As described above, in the STD mode, a compressed signal for one GOP is stored and recorded in five data formats (30 inclined tracks), and in the LS3 mode, a compressed signal for three GOPs is stored in five data formats (30 inclined tracks). In the LS5 mode, a compressed signal for one GOP is stored and recorded in one data format (6 inclined tracks).

On the other hand, upon receiving the recording start instruction, the CPU 4 outputs capstan type servo information to the recording / reproducing unit 3 to control the traveling speed of the magnetic tape in the recording / reproducing unit 3 to a predetermined traveling speed. Then, the track sequence information c is output from the recording / reproducing unit 3 to the CPU 4.

Here, the track sequence information c is DV
Since the information is such that the pulse is inverted each time six inclined tracks forming the HS data format are formed,
In the STD mode, the pulse is inverted every three revolutions of the rotating drum, in the LS3 mode, the pulse is inverted every nine revolutions of the rotating drum, and in the LS5 mode, the pulse is inverted every 15 revolutions of the rotating drum.

Then, the CPU 4 generates a read pulse d based on the track sequence information c output from the recording / reproducing unit 3 and the inverted pulse b from the encoder 1, and outputs the read pulse d to the buffer 2. First, at the pulse inversion timing of the next track sequence information c in which the inversion pulse b of FIG.
After that, the read pulse d is output at the timing of the data block forming the editing unit in each recording mode shown in FIG.

That is, in the STD mode, since the data block forming the editing unit is one GOP, even after the first read pulse d is output, every time the inverted pulse b is inverted, the pulse of the next track sequence information c is output. The read pulse d is output at the inversion timing.

The read data e read from the buffer 2 is formatted for every six tracks of data and recorded on the inclined track on the magnetic tape. Also,
The CPU 4 outputs a read pulse d to the buffer 2 and at the same time outputs a similar pulse to the recording / reproducing unit 3. The recording / reproducing unit 3 receiving the pulse outputs the duty ratio of the control pulse recorded in the longitudinal direction of the magnetic tape. Is changed, the flag information indicating the break of the data block forming the editing unit is recorded.

As described above, not only the flag information is added to the control track formed in the longitudinal direction of the magnetic tape, but also the flag information is added to the subcode area of the inclined track, so that the data forming the editing unit is obtained. Block breaks can be more reliably detected.
Alternatively, the flag information may be recorded by recording a signal of a predetermined frequency using a linear audio track similarly formed in the longitudinal direction of the magnetic tape without using the control track.

With the above-described recording operation, in the STD mode, a compressed signal for one GOP is recorded on 30 inclined tracks, and a subsequent GOP compressed signal is similarly recorded on 30 inclined tracks. , GOP can be used to edit the recording signal.

Next, the recording operation of the video signal in the LS3 mode in the compressed signal recording device and the compressed signal recording / reproducing device according to the present invention will be described with reference to FIG. User is a GU
When the LS3 mode is selected as the recording mode by I7 and a recording start instruction is given, the CPU 4 sets the encoding rate of the encoder 1 to a value corresponding to the recording rate of 4.7 Mbps, and the encoder 1 transmits the incoming video signal. Perform compression encoding.

Then, the encoder 1 outputs the compressed signal a, which has been subjected to the compression encoding process, to the buffer 2, and outputs an inverted pulse b, which is inverted at a GOP break in the compressed signal a, to C.
Output to PU4. The compressed signal a output from the encoder 1 is sequentially stored in the buffer 2, and reading is started from the data at the head of the data block forming the editing unit at the timing of the read pulse d from the CPU 4.

The CPU 4 receives capstan system servo information to control the running speed of the magnetic tape in the recording / reproducing unit 3 to 1/3 times the speed in the STD mode upon receiving the recording start instruction. Output to the recording / reproducing unit 3.
Then, the track sequence information c is output from the recording / reproducing unit 3 to the CPU 4.

Then, the CPU 4 generates a read pulse d based on the track sequence information c output from the recording / reproducing unit 3 and the inverted pulse b from the encoder 1, and outputs this to the buffer 2. In the LS3 mode, Since the data block forming the editing unit is 3 GOP (30 inclined tracks), after outputting the first read pulse d,
The three pulse inversion timings of the inversion pulse b are counted, and the read pulse d is output again at the pulse inversion timing of the track sequence information c following the third pulse inversion timing.

The read data e read from the buffer 2 is formatted for every six tracks of data and recorded on the inclined track on the magnetic tape. In this case, as described above, in the LS3 mode, one inclined track is formed every time the rotating drum rotates 1.5 times.
Only after nine revolutions of the rotating drum, six inclined tracks are formed.

The CPU 4 sends the read pulse d to the buffer 2.
The same pulse is output to the recording / reproducing unit 3 at the same time as the output, and the recording / reproducing unit 3 receiving the same changes the duty ratio of the control pulse to be recorded in the longitudinal direction of the magnetic tape to change the editing unit. Is recorded as flag information indicating the break of a data block that forms

With the above-described recording operation, in the LS3 mode, a compressed signal of 3 GOPs is recorded on 30 inclined tracks, and the compressed signals of the following 3 GOPs are similarly recorded on 30 inclined tracks.
Since recording is performed on three inclined tracks, it is possible to edit the recording signal in units of 3 GOPs.

Next, the recording operation of the video signal in the LS5 mode in the compressed signal recording device and the compressed signal recording / reproducing device according to the present invention will be described with reference to FIG. User is a GU
When the LS5 mode is selected as the recording mode by I7 and a recording start instruction is given, the CPU 4 sets the encoding rate of the encoder 1 to a value corresponding to the recording rate of 2.8 Mbps, and the encoder 1 transmits the incoming video signal. Perform compression encoding.

Then, the encoder 1 outputs the compressed signal a, which has been subjected to the compression encoding process, to the buffer 2, and outputs the inverted pulse b, which is inverted at the end of the GOP in the compressed signal a, to C.
Output to PU4. The compressed signal a output from the encoder 1 is sequentially stored in the buffer 2, and reading is started from the data at the head of the data block forming the editing unit at the timing of the read pulse d from the CPU 4.

Further, the CPU 4 receives capstan system servo information in order to control the running speed of the magnetic tape in the recording / reproducing unit 3 to 1/5 times the speed in the STD mode at the same time as receiving the recording start instruction. Output to the recording / reproducing unit 3.
Then, the track sequence information c is output from the recording / reproducing unit 3 to the CPU 4.

Then, the CPU 4 generates a read pulse d based on the track sequence information c output from the recording / reproducing unit 3 and the inversion pulse b from the encoder 1, and outputs this to the buffer 2. In the LS5 mode, The data block that constitutes the editing unit is 1 GOP (6 inclined tracks)
Therefore, even after outputting the first read pulse d, the read pulse d is output at the pulse inversion timing of the next track sequence information c every time the inverted pulse b is inverted.

The read data e read from the buffer 2 is formatted for every six tracks of data and recorded on the inclined track on the magnetic tape. At this time, as described above, in the LS5 mode, one inclined track is formed every time the rotary drum makes 2.5 rotations. Therefore, six inclined tracks are formed only after the rotary drum has rotated 15 times.

The CPU 4 sends the read pulse d to the buffer 2.
The same pulse is output to the recording / reproducing unit 3 at the same time as the output, and the recording / reproducing unit 3 receiving the same changes the duty ratio of the control pulse to be recorded in the longitudinal direction of the magnetic tape to change the editing unit. Is recorded as flag information indicating the break of a data block that forms

By the above-described recording operation, in the LS5 mode, the compressed signal for one GOP is recorded on six inclined tracks, and the subsequent GOP compressed signals are similarly recorded on the six inclined tracks. It becomes possible to edit the recording signal in units of 1 GOP.

As described above, the bit rate of the recordable information signal differs depending on the recording mode.
Is set to an encoding rate according to the recording mode, so that the addition of dummy data can be minimized when the recording / reproducing unit 3 records the compressed signal.

Next, a description will be given of the operation of reproducing the compressed signal recorded on the magnetic tape in this way and the operation of the splicing recording in which a new compressed signal is rewritten in the middle of the recorded compressed signal. When the user gives a reproduction start instruction through the GUI 7, the CPU 4 controls the running speed of the magnetic tape so that the control pulse recorded in the longitudinal direction on the magnetic tape is reproduced at 30 Hz, and at the same time, changes the recording mode during recording. Determine.

Then, the reproduced signal is output from the recording / reproducing unit 3 to the decoder 5, and the decoder 5 performs MPEG2 expansion processing. The video signal that has been decompressed by the decoder 5 is output to a monitor or the like (not shown) via the OSD 6, and the user can check the reproduced signal on this monitor.

Here, when the user performs the splice recording while the signal from the magnetic tape is being reproduced, the user checks the reproduced video on a monitor (not shown), for example, at a position where the splice recording is desired. An instruction for connection recording is given by the GUI 7. Then, the CPU 4 receiving this controls the capstan on the basis of the flag information indicating the break of the data block reproduced by the recording / reproducing unit 3, and the break position of the data block immediately after the user gives the instruction. To stop the magnetic tape.

Thereafter, an instruction is given again from the GUI 7 at the timing when a new video signal to be recorded arrives at the encoder 1 so that the magnetic tape runs and the recording operation is started, so that 1 GOP, L in the STD mode.
In the S3 mode, 3 GOPs can be performed, and in the LS5 mode, continuous recording can be performed in units of 1 GOP.

In the above embodiment, the encoder 1 has been described as constituting a part of the configuration of the present compressed signal recording device or the compressed signal recording / reproducing device. However, for example, the encoder 1 may be provided in an external device. . At this time, an external device and the compressed signal recording device or the compressed signal recording / reproducing device are connected by a serial cable conforming to IEEE1394, and the compressed signal a output from the encoder 1 is transmitted through the serial cable. It is transmitted to a recording device or a compressed signal recording / reproducing device.

Further, the external device controls the recording mode of the compression signal recording device or the compression signal recording / reproducing device via the serial cable, and sets the internal encode rate accordingly. Further, a detection mechanism for detecting the head of the GOP in the compression signal a received via the serial cable is provided in the compression signal recording apparatus or the compression signal recording / reproducing apparatus, and this detection mechanism indicates a GOP break. The inversion pulse b is output to the CPU 4.

The external device may be a set-top box connected via the serial cable, a personal computer that performs encoding by software processing, or the like.
In this way, when an external device capable of performing the encoding process is connected via the serial cable, the same effect can be obtained even if the encoder is not mounted inside.

[0060]

According to the first or fourth aspect of the present invention, the edit point information is written at intervals at which the breaks in the compressed data and the breaks in the data format match. There is an effect that data can be easily rewritten.

According to the second aspect of the present invention, the buffer means outputs the compressed data in synchronization with the recording timing of the edit point information. There is an effect that the head portion can be recorded at the head portion of the data format.

According to the third aspect of the present invention, since the encode rate of the encoding unit is changed according to the recording mode, there is an effect that insertion of dummy data in the recording unit can be minimized.

According to the fifth aspect of the invention, since the running of the magnetic tape is controlled based on the edit point information reproduced from the magnetic tape, a part of the compressed data recorded on the magnetic tape can be rewritten. This has the effect of becoming

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a compressed signal recording device and a compressed signal recording / reproducing device according to the present invention.

FIG. 2 is a diagram for explaining a recording operation in an STD mode.

FIG. 3 is a diagram illustrating the size of a data block forming an editing unit in each recording mode.

FIG. 4 is a diagram for explaining a recording operation in the LS3 mode.

FIG. 5 is a diagram for explaining a recording operation in an LS5 mode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Encoder 2 ... Buffer 3 ... Recording / playback part 4 ... CPU 5 ... Decoder 6 ... OSD 7 ... GUI

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Claims (5)

[Claims] An encoding means for compressing and encoding a video signal of a predetermined number of frames in one compression unit, and outputting a series of video signals to be recorded as compressed data; When recording while sequentially forming a plurality of inclined tracks on a tape, compressed data for the s (s is an integer of 2 or more) inclined tracks is used as one data format, and the compressed data for the compression unit is recorded. recording means for recording on t inclined tracks and recording edit point information for each inclined track corresponding to the least common multiple of s and t of the inclined tracks. Compression signal recording device. And a buffer unit for temporarily storing the compressed data output from the encoding unit to the recording unit, wherein the buffer unit synchronizes with a recording timing of the edit point information and stores the compressed data for the compression unit. 2. The compressed signal recording apparatus according to claim 1, wherein the apparatus outputs compressed data. 3. The recording unit is capable of recording the compressed data in one of a plurality of recording modes having different recording bit rates, and the encoding unit is configured to record a bit rate of the compressed data to be output. 3. The compressed signal recording apparatus according to claim 1, wherein the apparatus can be changed according to the recording mode. 4. A method of recording compressed data in which a predetermined frame of a series of video signals to be recorded is compression-encoded as one compression unit while sequentially forming a plurality of inclined tracks on a magnetic tape. Compressed data for the number of inclined tracks (s is an integer of 2 or more) is used as one data format, and compressed data for the compression unit is recorded on t inclined tracks, and s and t of the inclined tracks are recorded. A compressed signal recording method, wherein edit point information is recorded for each inclined track corresponding to the least common multiple of a book. 5. An encoding means for compressing and encoding a video signal of a predetermined number of frames in one compression unit, and outputting a series of video signals to be recorded as compressed data; When recording while sequentially forming a plurality of inclined tracks on a tape, compressed data for the s (s is an integer of 2 or more) inclined tracks is used as one data format, and the compressed data for the compression unit is recorded. recording means for recording on t inclined tracks, and recording edit point information for each inclined track corresponding to the least common multiple of s and t of the inclined tracks; A reproducing unit that reproduces the compressed data recorded in the compressed data and reproduces the edit point information; and performs a decompression process on the compressed data reproduced by the reproducing unit. Decoding means for restoring the series of video signals, controlling the running of the magnetic tape based on the edit point information reproduced by the reproducing means, and rewriting the compressed data after any edit point A compressed signal recording / reproducing apparatus characterized in that it is made possible.