JPH0856334A - Video signal reproducing device - Google Patents

Abstract

PURPOSE:To obtain a reproduced image showing natural motion when a video signal which is compressed and encoded by an encoding system and completed with plural frames is reproduced at, for example, a double speed. CONSTITUTION:A control system block 4A controls the operation of a signal reproduction block 1, the switching operation of a changeover switch 9, and the writing and reading operation of a memory block 10. When double-speed reproduction is indicated with a reproduction speed control signal SPC, a pickup 3 reproduces a compressed video signal by every 10 frames intermittently at intervals of, for example, 5 frames and a demodulator 6 demodulates the signal. The compressed video signal is supplied to decoders 7A and 7B alterantely by every 5 frames through the changeover switch 9 and decoded, and the decoded signals are written in the memory block 10. The video signal of every other frame is read out of the memory 10 to obtain a video signal Vout for double- speed reproduction. Thus, the video signal Vout for double-speed reproduction is obtained by thinning out the signal in thinning-out units less than compression constitution frames (5 frames), so the double-speed image showing natural motion is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal reproducing apparatus for reproducing a video signal compression-encoded from a recording medium such as a magneto-optical disk by a compression-encoding method completed in a plurality of frames.

[0002]

2. Description of the Related Art FIG. 6 shows a structural example of a magneto-optical reproducing apparatus. In the figure, reference numeral 1 is a signal reproduction block for reproducing a video signal from the magneto-optical disk 2 by the optical pickup 3. The signal reproduction block 1 includes means (not shown) for rotationally driving the magneto-optical disk 2, means for radial movement control of the optical pickup 3, and means for performing tracking servo and focus servo of the optical pickup 3. Etc. are provided. The operation of the signal reproduction reproduction block 1 is controlled by a control system block 4 having a microcomputer.

On the magneto-optical disk 2, a video signal is compression-encoded by an encoding method in which a video signal is completed in a plurality of frames, for example, an inter-frame predictive encoding method such as MPEG, and then modulated (channel encoding) by a predetermined method. Is recorded. The reproduction RF signal obtained from the optical pickup 3 is amplified by the reproduction amplifier 5, demodulated by the demodulator 6, decoded by the decoder 7, and output to the output terminal 8 as the output video signal Vout.

Next, the reproducing operation will be described with reference to FIG. In FIG. 7, the added numbers indicate frame numbers. In order to simplify the explanation, it is assumed that the magneto-optical disk 2 has recorded therein a video signal compression-coded by an encoding method which is completed in 5 frames.

First, a case will be described in which the reproduction speed control signal SPC supplied to the control system block 4 instructs reproduction at 1 × speed. In this case, as shown in FIG. 7A, the optical pickup 3 is intermittently separated by 5 frames at intervals of 5 frames.
Thus, the compressed video signal is reproduced from the magneto-optical disk 2. This compressed video signal is demodulated by the demodulator 6 and then supplied to the decoder 7 for decompression processing, and the output video signal Vout capable of obtaining a 1 × speed reproduced image is output to the output terminal 8 as shown in FIG. 7B. can get.

Next, a case will be described in which the control system block 4 is instructed to perform double speed reproduction by the reproduction speed control signal SPC. In this case, as shown in FIG. 7C, the compressed video signal is reproduced from the magneto-optical disk 2 by the optical pickup 3 intermittently at intervals of 5 frames for 10 frames. This compressed video signal is demodulated by the demodulator 6 and then the decoder 7
Is supplied to. In the decoder 7, the decompression decoding process is performed only on the compressed video signals for the first 5 frames reproduced in each 5 frame period, and the output terminal 8 outputs the double speed as shown in FIG. An output video signal Vout capable of obtaining a reproduced image is obtained.

[0007]

According to the example of FIG. 6, 2
When double-speed reproduction is instructed, if the video signal is compression-encoded by an encoding method that is completed in a plurality of frames, the plurality of frames (hereinafter referred to as “compression constituent frame”)
An output video signal Vout decimated in units of () is obtained. Therefore, when there is a motion in the image, there is a problem that the double-speed reproduced image by the output video signal Vout becomes a very unnatural image in which the motion is awkward.

Therefore, according to the present invention, a video signal which can be reproduced naturally can be obtained even when a video signal compression-encoded by an encoding method completed in a plurality of frames is reproduced at a double speed, for example. A playback device is provided.

[0009]

According to a first aspect of the present invention, there is provided a video signal reproducing apparatus for reproducing a video signal compression-encoded from a recording medium by an encoding method completed in a plurality of frames. , A reproduction control means for reproducing a video signal from a recording medium at N times speed (N is 1 or more), a decoding means of M system (M is a value obtained by rounding up the fractional part of N), and a reproduction control means. Signal distribution means for selectively supplying the reproduced video signal to the M-system decoding means in units of a plurality of frames, memory means for sequentially storing the video signals decoded by the M-system decoding means, and this memory Read-out control means for obtaining an output video signal by thinning out and reading out a video signal in a thinning unit smaller than the plurality of frames so that a reproduced image at N times speed can be obtained by the means. Is shall.

According to a second aspect of the present invention, there is provided a video signal reproducing apparatus which reproduces a video signal compression-coded from a recording medium by an encoding method which is completed in a plurality of frames. 1 to video signal
Reproduction control means for reproducing at double speed, two-system decoding means, and signal distribution for selectively supplying reproduction video signals reproduced by the reproduction control means to the two-system decoding means in units of the plurality of frames. Means, a memory means for sequentially storing the video signals decoded by each of the two decoding means, and a video in a thinning unit smaller than the plurality of frames so that a reproduced image at 1 to 2 times speed can be obtained from the memory means. And a read control means for obtaining an output video signal by thinning out the signal and reading it.

According to a third aspect of the present invention, there is provided a video signal reproducing apparatus for reproducing a video signal which is compression-encoded from a recording medium by a coding method which is completed in a plurality of frames. A reproduction control means for reproducing the video signal at a double speed, a two-system decoding means,
A signal distribution means for alternately supplying the reproduced video signal reproduced by the reproduction control means to the two-system decoding means in units of the plurality of frames and the video signals decoded by the two-system decoding means, respectively. It is provided with a memory means for storing and a read control means for obtaining an output video signal by reading the video signal from the memory means every other frame or every other field.

A video signal reproducing apparatus according to a fourth aspect of the present invention is the video signal reproducing apparatus according to any one of the first to third aspects of the invention, wherein the recording medium is a disc-shaped recording medium.

A video signal reproducing apparatus according to a fifth aspect of the present invention is the video signal reproducing apparatus according to any one of the first to third aspects of the invention, wherein the encoding method is an interframe predictive encoding method which is completed in a plurality of frames. .

[0014]

According to the present invention, the video signal reproduced at N times speed from the recording medium is selectively used as the decoding means for M systems (M is a value obtained by rounding up the fractional part of N) in units of compressed frames. And the expansion decoding of all the frames of the reproduced video signal is performed by the cooperation of the decoding means of the M system. Therefore, it is possible to obtain the output video signal for the N-fold speed reproduced image by thinning out and reading out from the memory means in a thinning unit smaller than the compression component frame so as to obtain the N-fold speed reproduced image. Since the output video signal for the playback image at N times speed is formed by thinning out in a thinning unit smaller than the compressed frame, the N
It is possible to obtain a double-speed reproduced image.

According to the second aspect of the present invention, the video signal reproduced from the recording medium at a speed of 1 to 2 times is selectively supplied to the decoding means of the two systems in units of compressed constituent frames.
All the frames of the reproduced video signal are expanded and decoded by the cooperation of the two decoding means. Therefore, it is possible to obtain an output video signal for a reproduction image at a speed of 1 to 2 times by thinning out and reading in a thinning unit smaller than the compression constituent frame so that a reproduction image at a speed of 1 to 2 times can be obtained from the memory means. Since the output video signal for the reproduction image of 1 to 2 times speed is formed by thinning out in a thinning unit smaller than the compression constituent frame, it is possible to obtain the reproduction image of 1 to 2 times speed in which the motion is natural.

According to the third aspect of the present invention, the video signal reproduced at a double speed from the recording medium is selectively supplied to the decoding means of the two systems in units of compressed constituent frames, and the decoding means of the two systems is shared. By the operation, expansion decoding of all frames of the reproduced video signal is performed. Therefore, it is possible to obtain an output video signal for a double-speed reproduced image by reading the video signal from the memory means every other frame or every other field. Since an output video signal for a double-speed reproduced image is formed by thinning out in a thinning unit smaller than the compressed frame, it is possible to obtain a double-speed reproduced image with natural motion.

According to another aspect of the invention, the recording medium is a disc-shaped recording medium, and the disc-shaped recording medium is recorded with a video signal which has been compression-encoded by an encoding method which is completed in a plurality of frames. When the reproduction is performed at N times speed, it is possible to obtain a reproduced image at N times speed in which movement is natural.

According to the invention of claim 5, the coding method is an inter-frame predictive coding method which is completed in a plurality of frames, and a video signal which is compression-coded on the recording medium by this inter-frame predictive coding method. Is recorded,
When N-speed reproduction is performed, it is possible to obtain a reproduced N-speed reproduced image with natural movement.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention will be described below with reference to FIG.
Examples will be described. This example is applied to a magneto-optical disk reproducing apparatus, and takes into consideration reproduction at 1 to 2 times speed. In FIG. 1, parts corresponding to those in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the figure, 4A is a control system block having a microcomputer, which corresponds to the control system block 4 in the example of FIG. The operation of the signal reproduction block 1 is controlled by the control system block 4A. A reproduction speed control signal SPC is supplied to the control system block 4A.

Further, the reproduction RF signal obtained from the optical pickup 3 is amplified by the reproduction amplifier 5, demodulated by the demodulator 6 and supplied to the movable terminal of the changeover switch 9 constituting the signal distribution means. The changeover of the changeover switch 9 is controlled by the control system block 4A. The compressed video signal obtained on the a side of the changeover switch 9 is decompressed and decoded by the decoder 7A and then supplied to the memory block 10 as a write signal. On the other hand, the compressed video signal obtained on the b side of the changeover switch 9 is expanded and decoded by the decoder 7B and then supplied to the memory block 10 as a write signal. The memory block 10 is supplied with a write control signal WCS and a read control signal RCS from the control system block 4A and controlled.

This example is configured as described above, and the reproducing operation of this example will be described below with reference to FIGS. 2 and 3. Figure 2
In addition, in FIG. 3, the added numbers indicate frame numbers. In order to simplify the explanation, it is assumed that the magneto-optical disk 2 has recorded therein a video signal compression-coded by an encoding method which is completed in 5 frames.

First, a case will be described in which the reproduction speed control signal SPC supplied to the control system block 4A instructs reproduction at 1 × speed. In this case, as shown in FIG. 2A, the compressed video signal is reproduced by the optical pickup 3 intermittently every 5 frames at intervals of 5 frames, and the changeover switch 9 remains connected to the side a. Therefore, this reproduced compressed video signal is demodulated by the demodulator 6 and then supplied to the decoder 7A via the a side of the changeover switch 9 to be expanded and decoded, and a video signal is obtained as shown in FIG. 2B.

The video signal obtained by decompressing and decoding in the decoder 7A is supplied to the memory block 10 and sequentially written therein, and is read out sequentially from the memory block 10 after a predetermined time, and the 1 × speed as shown in FIG. 2C is obtained. The output video signal Vout for the reproduced image is output to the output terminal 8. In this case, since all of the video signals written in the memory block 10 are read out, the video signal obtained by decompression decoding in the decoder 7A is directly led to the output terminal 8 without writing or reading in the memory block 10. You may. Further, the changeover switch 9 may be connected to the b side to use the decoder 7B, or both the decoders 7A and 7B may be used alternately.

Next, a case will be described in which the reproduction speed control signal SPC is instructed to the control system block 4A for reproduction at double speed. In this case, as shown in FIG. 2D, the compressed video signal is reproduced by the optical pickup 3 intermittently every 10 frames at intervals of 5 frames, and the compressed video signal is demodulated by the demodulator 6. The change-over switch 9 is alternately connected to the a side and the b side in correspondence with a compressed video signal for each 5 frames reproduced by the optical pickup 3 as shown in FIG.

Therefore, the compressed video signal demodulated by the demodulator 6 is alternately decoded by 5 frames for each of the decoders 7A and 7B.
And decompression-decoded to obtain a video signal as shown in FIGS. 2F and 2G, respectively. Then, the video signals output from the decoders 7A and 7B are written in the memory block 10, and the video signals are read from the memory block 10 every other frame, and for the double-speed reproduction image as shown in FIG. Is output to the output terminal 8 as the output video signal Vout.

Next, a case will be described in which the control system block 4A is instructed to reproduce at 1.5 times speed by the reproduction speed control signal SPC. In this case, as shown in FIG. 3A, compressed video signals for 10 frames and 5 frames are intermittently and alternately reproduced at intervals of 5 frames by the optical pickup 3, and the compressed video signals are demodulated by the demodulator 6. The change-over switch 9 is connected to the side a corresponding to the compressed video signals for the first 5 frames in the 5 frame period in which the compressed video signals for 10 frames are read out as shown in FIG. It is connected to the b side corresponding to the compressed video signal, and is connected to the a side during the period in which the compressed video signal for 5 frames is read out.

Therefore, the 5-frame compressed video signal demodulated by the demodulator 6 at the beginning of the 5-frame period in which the 10-frame compressed video signal is read out is supplied to the decoder 7A for decompression / decoding. The compressed video signal for 5 frames which is subsequently demodulated by the demodulator 6 in the frame period is supplied to the decoder 7B for decompression and further 5
During the period in which the compressed video signal for the frame is read out, the compressed video signal for 5 frames demodulated by the demodulator 6 is supplied to the decoder 7A for decompression and is decoded by the decoders 7A and 7B. A video signal is obtained as shown in.

Then, the video signals output from the decoders 7A and 7B are written in the memory block 10, and in order to obtain a reproduced image of 1.5 times speed from the memory block 10, a thinning-out process smaller than a compression configuration frame (5 frames) is performed. The data is thinned out and read out in units of 1.5 as shown in FIG.
The output video signal Vout for a double-speed reproduced image is output to the output terminal 8.

Although a detailed description is omitted, even when the reproduction speed control signal SPC indicates a reproduction speed other than the above-mentioned 1 ×, 1.5 ×, and 2 × speeds, the optical speed The optical pickup 3 intermittently reads a required amount of compressed video signal from the magnetic disk 2 in accordance with its reproduction speed, demodulates it by a demodulator 6, and thereafter expands and decodes the compressed video signals of all frames. Thus, the output video signal Vout for obtaining the reproduced image at the instructed reproduction speed by distributing to the decoders 7A and 7B by the changeover switch 9 and thinning out from the memory block 10 in the thinning unit smaller than the compression constituent frame. Can be obtained.

As described above, according to this example, the thinning-out unit smaller than the compression frame (5 frames)
The output video signal Vout for the double-speed reproduction image is formed, and the output video signal Vout is not obtained by thinning out in units of compression constituent frames.
It is possible to obtain a double-speed reproduced image.

Next, a second embodiment of the present invention will be described with reference to FIG. This example is also applied to the magneto-optical disk reproducing apparatus, and is intended for reproduction at 1 to 3 times speed. 4, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the figure, the reproduction RF signal obtained from the optical pickup 3 is amplified by the reproduction amplifier 5, demodulated by the demodulator 6 and supplied to the movable terminal of the changeover switch 9A which constitutes the signal distribution means. The changeover of the changeover switch 9A is controlled by the control system block 4A. The compressed video signals obtained on the a side, the b side and the c side of the changeover switch 9 are expanded and decoded by the decoders 7A, 7B and 7C, respectively, and then supplied to the memory block 10 as a write signal.

This example is configured as described above, and the reproducing operation of this example will be described below with reference to FIG. In FIG.
The number attached indicates the frame number. In order to simplify the explanation, it is assumed that the magneto-optical disk 2 has recorded therein a video signal compression-coded by an encoding method which is completed in 5 frames.

A case will be described in which the reproduction speed control signal SPC supplied to the control system block 4A instructs reproduction at 3 × speed. In this case, as shown in FIG. 5A, the compressed video signal is reproduced from the magneto-optical disk 2 by the optical pickup 3 intermittently at intervals of 5 frames by 15 frames, and the compressed video signal is demodulated by the demodulator 6. The change-over switch 9A is sequentially connected to the a side, the b side, and the c side corresponding to the compressed video signals for each 5 frames reproduced by the optical pickup 3 as shown in FIG.

Therefore, the compressed video signal demodulated by the demodulator 6 is sequentially supplied to the decoders 7A, 7B and 7C by 5 frames and is expanded and decoded.
A video signal is obtained as shown at C, D and E. Then, the video signals output from the decoders 7A, 7B, and 7C are written in the memory block 10, and the video signals are read out from the memory block 10 every two frames, and reproduced at triple speed as shown in FIG. The output video signal Vout for an image is output to the output terminal 8.

Although detailed description is omitted, when the reproduction speed control signal SPC indicates a reproduction speed of 1 to 2 times,
The changeover switch 9A is controlled to switch between the a side and the b side, and the decoder 7C is set to the non-use state and controlled in the same manner as in the example of FIG. An output video signal Vout for an image can be obtained.
Further, even when a reproduction speed other than the above-mentioned double speed or triple speed is instructed between 2 to 3 times speed, a necessary amount of compression is performed by the optical pickup 3 from the magneto-optical disk 2 in response to the reproduction speed. The video signal is read out intermittently and demodulated by the demodulator 6, and thereafter, the changeover switch 9 is used for the decoders 7A and 7B so that the compressed video signals of all the frames are expanded and decoded.
And 7C, and decimated by a decimating unit smaller than the compression constituent frame than the memory block 10 to obtain an output video signal Vout for obtaining a reproduced image at a designated reproduction speed.

As described above, also in this example, the thinning-out unit smaller than the compression configuration frame (5 frames)
The output video signal Vout for the reproduced image of 3 × speed is formed, and the output video signal Vout is not obtained by thinning out in units of compression constituent frames.
It is possible to obtain a double-speed reproduced image.

In the above embodiment, the output video signal Vout for the reproduction image of 1 to 3 times speed is shown, but in the same manner, the reproduction video image of higher speed than 3 times speed is obtained. The output video signal Vout can be obtained. Generally, an output video signal V for an N times speed reproduced image
To obtain out, an M-system (M is a value obtained by rounding up the fractional part of N is rounded up) decoder is required to perform expansion decoding processing on all frame signals.

Further, in the above-mentioned embodiment, for the sake of simplification of explanation, the compression composing frame is set to five frames, but the compression composing frame is not limited to this. Further, in the above-described embodiment, the minimum thinning unit is one frame, but it may be one field. Further, although the above-described embodiment is applied to the magneto-optical reproducing apparatus, the present invention reproduces a video signal compression-encoded from a recording medium by an encoding method completed in a plurality of frames. Of course, the same can be applied to the reproducing apparatus.

[0041]

According to the first aspect of the present invention, the video signal reproduced at N times speed from the recording medium is M systems in units of the compression constituent frame (M is a value obtained by rounding up the decimal point of N).
Is selectively supplied to the decoding means of the M system, and the expansion decoding of all the frames of the reproduced video signal is performed by the cooperation of the decoding means of the M system, so that the reproduced image at N times speed can be obtained from the memory means. It is possible to obtain an output video signal for an N times speed reproduction image by thinning out and reading out in a thinning unit smaller than the compression constituent frame. Therefore, an output video signal for an N times speed reproduction image is thinned out by a thinning unit smaller than the compression constituent frame. Is formed, it is possible to obtain a reproduced image at N times speed with natural movement.

According to the second aspect of the invention, the recording medium is 1
The video signal reproduced at 2 × speed is selectively supplied to the two-system decoding means in units of compressed constituent frames.
Since all the frames of the reproduced video signal are expanded and decoded by the cooperation of the decoding means of the system, the thinning unit smaller than the compression component frame is used to obtain a reproduced image at 1 to 2 speed from the memory means. 1 by reading
It is possible to obtain an output video signal for a reproduced image at a speed of up to 2 times, and therefore, an output video signal for a reproduced image at a speed of 1 to 2 times is formed by thinning out by a thinning unit smaller than a compression constituent frame, so that a natural motion is obtained. It is possible to obtain a reproduced image at 1 to 2 times speed.

According to the third aspect of the present invention, the recording medium is
The video signal reproduced at double speed is selectively supplied to the decoding system of two systems in units of compressed constituent frames, and the expansion decoding of all frames of the reproduced video signal is performed by the cooperation of the decoding systems of two systems. 1 means from memory means
By reading out the video signal every frame or every other field, the output video signal for the double speed reproduction image can be obtained. Therefore, the output video signal for the double speed reproduction image is thinned out by the thinning unit smaller than the compression frame. Since it is formed, it is possible to obtain a reproduced image at a double speed with natural movement.

According to the fourth aspect of the present invention, the recording medium is a disc-shaped recording medium, and the video signal which is compression-encoded by the encoding method completed in a plurality of frames is recorded on the disc-shaped recording medium. In this case, an N × speed reproduction image with natural movement can be obtained when the N × speed reproduction is performed.

According to the fifth aspect of the present invention, the coding system is an interframe predictive coding system which is completed in a plurality of frames, and the video is compression-coded on the recording medium by the interframe predictive coding system. If the signal is recorded,
When N-fold speed reproduction is performed, it is possible to obtain a N-speed reproduction image with natural movement.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a video signal reproducing device according to the present invention.

FIG. 2 is a diagram for explaining a reproducing operation of the first embodiment.

FIG. 3 is a diagram for explaining a reproduction operation of the first embodiment.

FIG. 4 is a configuration diagram showing a second embodiment of a video signal reproducing device according to the present invention.

FIG. 5 is a diagram for explaining a reproducing operation of the second embodiment.

FIG. 6 is a diagram showing a configuration example of a magneto-optical reproducing device.

FIG. 7 is a diagram for explaining a reproduction operation of the example of FIG.

[Explanation of symbols]

 1 signal reproduction block 2 magneto-optical disk 3 optical pickup 4A control system block 5 reproduction amplifier 6 demodulator 7A to 7C decoder 8 output terminal 9, 9A changeover switch 10 memory block

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G11B 20/12 9295-5D 103 9295-5D H04N 5/92

Claims (5)

[Claims] 1. A video signal reproducing apparatus for reproducing a video signal compression-encoded from a recording medium by an encoding method which is completed in a plurality of frames, wherein the video signal is N times speed (N is 1 or more) from the recording medium. And a reproduction control means for reproducing the reproduction video signal reproduced by the reproduction control means, and a reproduction video signal reproduced by the reproduction control means in units of the plurality of frames. Signal supplying means for selectively supplying to the decoding means, memory means for sequentially storing the video signals decoded by each of the M-system decoding means, and the N-fold speed reproduced image is obtained from this memory means. Read-out control means for obtaining an output video signal by thinning out and reading the video signal in a thinning unit smaller than the plurality of frames. Oh signal reproducing apparatus. 2. A video signal reproducing apparatus for reproducing a video signal compression-encoded from a recording medium by an encoding method which is completed in a plurality of frames, in which the video signal is reproduced from the recording medium at 1 to 2 times speed. Control means, two-system decoding means, signal distribution means for selectively supplying the reproduced video signal reproduced by the reproduction control means to the two-system decoding means in units of the plurality of frames, Memory means for sequentially storing the video signals decoded by each of the two systems of decoding means, and the video signal in a thinning unit smaller than the plurality of frames so that a reproduced image at the speed of 1 to 2 times can be obtained from the memory means. And a read control means for obtaining an output video signal by thinning out and reading the video signal. 3. A video signal reproducing apparatus for reproducing a video signal compression-encoded from a recording medium by an encoding method which is completed in a plurality of frames, in a reproducing control means for reproducing the video signal from the recording medium at double speed. A two-system decoding means, a signal distribution means for selectively supplying the reproduced video signal reproduced by the reproduction control means to the two-system decoding means in units of the plurality of frames, and the two-system Memory means for sequentially storing the video signals decoded by each of the decoding means, and read control means for obtaining an output video signal by reading the video signals from the memory means every other frame or every other field. Characteristic video signal reproducing device. 4. The video signal reproducing apparatus according to claim 1, wherein the recording medium is a disc-shaped recording medium. 5. The video signal reproducing apparatus according to claim 1, wherein the encoding method is an interframe predictive encoding method that is completed by the plurality of frames.