JPH0136305B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention stores each signal train corresponding to an individual image or partial image of an image train at a predetermined storage frequency,
The present invention relates to a method for converting an image frequency to be output for subsequent reconversion into an image or partial image, and an apparatus for implementing this method. In a television receiver, images are reproduced on the image display surface at a constant image frequency of, for example, 25 images per second. Therefore, in order to reproduce a moving image slowly on the image display surface of a television receiver with a suitable reproduction device, when recording on an image medium, for example a video disc, this moving image must be reproduced at the above-mentioned image frequency. I need to record it. This means that a relatively large number of images are recorded per unit time, and since the image medium has a limited storage capacity, the storage capacity quickly runs out. For example, if the image medium has a playback time of 20 minutes, the above image frequency requires a storage capacity of 30,000 images. Known image media often still have a low storage capacity, and longer playback times cannot be obtained with this type of image media unless their storage capacity is significantly improved. SUMMARY OF THE INVENTION The present invention aims to provide a method and a device which not only allows for significantly longer playback times of image media, but is also suitable for other purposes, such as slow motion playback of dynamic processes. This problem is solved according to the invention by outputting a stored signal sequence for conversion into an image or partial image at a reproduction frequency different from the storage frequency. In this solution, the stored signal sequence is output and stored at the same time for conversion into an image or partial image, and then outputted again for conversion into an image or partial image. Therefore, storing a signal sequence and outputting it for conversion into an image or partial image is performed n times (n times) before outputting the signal sequence corresponding to the next image or partial image for conversion into an image or partial image. is an integer greater than or equal to 1). By means of such a method, in many cases, when the viewer reproduces this image, the reproduction frequency itself of the television receiver used in the usual manner can be increased by using the method according to the invention, without impairing the visual impression. Significantly fewer images can be recorded on the image medium per unit of playback time than required. The method according to the invention allows the image frequency, i.e. the number of image alternations per second, which is necessary only to represent a natural progression, without the motion progression appearing to the viewer as "wiggles", to be used in regular television receivers. It is based on the fact that it can be significantly less than the current value of 25 images/second. To represent this movement course as a natural movement sequence that appears continuous to the viewer, 10 images/second is sufficient, and only for very fast movements 60-80 images/second. Seconds are required. In most cases, an image frequency of 16 images/second or less is sufficient to represent natural motion courses. Therefore, using the method according to the invention, it is often sufficient to record significantly fewer images per unit of playback time. Therefore, the playback time of the image medium can be significantly increased. The method according to the invention can also be used to repeat any part of a television transmission, for example a football match that has just been broadcast, in slow motion on the image display surface if desired. This will be explained in more detail in Examples below. a signal train generator that generates each signal train corresponding to an individual image or partial image of the image train; a storage device connected to the signal train generator that stores the signal train at a predetermined storage frequency; A device for carrying out the method according to the invention, comprising a signal train converter for receiving said signal sequence from said device and converting it into an image or partial image and connected to said storage device, characterized in that the storage device has an output frequency different from the storage frequency. It is characterized by being configured as follows. Other features and configurations of the invention are described in the claims. Note that the terms used in this specification have the meanings defined in Table 1.

[Table] It can also be a number.
Next, preferred embodiments of the present invention will be described based on the drawings. FIG. 1 shows a signal train generator 1 to which a storage device 2 is connected. The storage device 2 is connected to a signal train converter 3, which is, for example, a conventional television receiver with an image display surface 4. The signal train generator 1 generates each signal train corresponding to an individual image or partial image of the image train. By partial image is meant here, in particular, an image obtained by interlaced scanning. One image of the image sequence is thus formed from two partial images. The first partial image consists of pixels corresponding to the first, third, fifth, etc., i.e., odd-numbered scanning lines, and the second partial image consists of pixels corresponding to the second, fourth, sixth, etc., i.e., even-numbered scanning lines. consists of pixels corresponding to the scanning lines. The signal train generator may be, for example, a playback device for a video disc. In this case, the playback device includes a disk player 5 equipped with an attached scanning device and a scanning signal converter 6 for converting a signal (for example, an optical signal) obtained by scanning a video disk into an electrical signal. If the scanning device of the disc player 5 supplies electrical signals directly, the scanning signal converter 6 can be omitted. At the output terminal 7 of the signal train generator 1, which also serves as the input terminal of the storage device 2,
Signal sequences can be added, one signal in this signal sequence corresponding to one image or partial image. In this case, the basis is that each signal sequence corresponds to one complete image. The signal train input to the storage device 2 first reaches an electronic switch 8 which has two outputs 9 and 10, so that the output 9 is connected to the input of the first reception storage 11 and the output 10 is connected to the input of the first reception storage 11. It is connected to the input end of the second reception memory 12. The electronic switch 8 is switched at the scanning cycle. Therefore, the first 1/2 image signal of the odd scanning line is input to the reception storage 11, and the reception storage 1
2 stores the second 1/2 image signal of the even scanning line.
In order to input the image signal into the storage device 2, for example,
Predetermined storage frequency corresponding to 12 1/2 images per second
f It is done in _S. The respective outputs of the two reception stores 11, 12 are connected to the respective inputs of output stores 15, 16 via clock generators 13, 14, respectively. Therefore, the 1/2 image signal stored in the reception stores 11, 12 is transmitted to the output stores 15, 16 at the clock frequency of the clock generators 13, 14. Set the frequency of the clock generator to the clock frequency f _T
Expressed as Note that the clock generator in the present application is a transmission controller that controls the storage reproducing operation of the storage device as described above. The output terminals of the output memories 15 and 16 are connected to different clock generators 17 and 16, respectively.
18 and return circuits 19 and 20 to an electronic switch 21, and the output end 22 of this switch is
It forms the output end of the storage device 2 and the input end of the signal string converter 3. The return circuits 19, 20 are connected via return lines 23, 24 to the inputs of the associated output memory 15 or 16, respectively. still,
The feedback circuit in this application is a switch that has the function of turning the image signal on and off to the signal conductor. The clock generators 17, 18 are the clock generators 13, 18,
14 clock frequency f _T
It operates at f _T ′, where f _T ′ is a higher frequency than f _T . The frequency of 1/2 image signal is input to input terminals 19a and 20a.
Feedback circuits 19 and 20 appearing with a period f _T are, for example, electronic switches of a gate circuit. These switches each have two outputs 19b, 19c or 20b, 20c, of which one output 19b and 20b is connected to the return conductors 23 and 24, respectively, and the other output 19c and 20c
are connected to each input terminal of the electronic switch 21. This electronic switch 21 operates so that its output end 22 is alternately connected to the output end 19c of the feedback circuit 19 and the output end 20c of the feedback circuit 20 at a period of 1/2 image. Therefore, at the output end 22, which is also the input end of the signal train converter 3, a signal train corresponding to a complete image consisting of signal trains of two 1/2 images appears at the output frequency _fA . This output frequency f _A is 25 images/second or 50 images/second, which corresponds to the normal television standard.
Images/second. The operating mode of the storage device 2 shown in FIG. This will be explained based on an example corresponding to the image frequency of an image. For detailed explanation, reference will be made to FIG. 4 showing the time course of the signal sequence, and it will be assumed that in the horizontal direction, the time coordinates are the same time for all the graphs in FIG. 4. Signal sequences A, B, C, D appear at the output 7, which signal sequences correspond to a complete image that is being scanned one after the other. In this case, the image frequency f _S = 12 1/2 images/
Seconds. The electronic switch 8 converts each signal train A, B, etc. into two signal trains A1 and A2, B1 and B2 using the method described above.
Divide into equal parts. These are denoted by 1a and 1b, and correspond to 1/2 images obtained by interlaced scanning, respectively. The signal sequences A1, B1, etc. are stored in the reception memory 1.
1, the signal sequence A is stored at the storage frequency f _S in the same way.
2, B2, etc., the same applies to the reception storage unit 12. The signal sequences A1, A2, etc. are output from the reception stores 11, 12 to the output stores 15, 16 via the clock generators 13, 14 in the manner shown in a and b. Clock generators 13 and 14 receive signal sequences A1, A2, B1, B2, etc. from reception storage units 11 and 12 and provide them to output storage units 15 and 16;
operates at a clock frequency f _T equal to the storage frequency f _S , but the signal train corresponding to one scanning line is input to the receiving memory units 11 and 12 at a clock frequency f T that is four times the scanning line transmission frequency f _Z . It operates at a certain scan line transmission frequency f _Z '. The transmission period is such that the end of reading a signal string in the receiving memory coincides with the end of reading the same signal string in the output memory, as shown by the dashed line in FIG. There is. clock generators 17, 18 and return circuit 19,
20 can be connected as follows. That is, each signal string A1, A2, B1, B2 is stored in the output memory 15, 16.
etc., the same signal train is sent to the feedback conductor 23.
or 24 to the output end 19c or 20c, and then the signal string stored in the output storage devices 15 and 16 is stored two more times in succession, and outputted from the output storage devices 15 and 16 three times in a row. , each signal string A
The clock generators 17, 18 and the feedback circuits 19, 20 are connected in such a way that clocks 1, B1, A2, B2, etc. appear at the output terminal 19c or 20c of the associated feedback circuit 19 or 20 four times in total. This transmission then takes place at the scanning line transmission frequency f _Z '. However, in this mode of operation, the clock generators 17, 18
is each fourth period (each period is one signal sequence A1,
(corresponding to the transit period of A2, B1, B2, etc.) must be connected in a blocking manner. In contrast, the simple mode of operation of the clock generators 17, 18 is such that both clock generators are open during each period of transmitting 1/2 image from the output storage, but the signal trains A1, A2 etc. after first loading,
This is achieved by outputting from the output storage device for the first time, storing it four times in total, and outputting it to the output terminal 19c or 20c. In this case, after the last signal string A1 or A2 is output, the next signal string B1, B2 is output to the output memory 1.
5, 16. The progress of these processes is shown in FIGS. 4a and 4b. These illustrations are shown at the output end 19
This relates to the signal sequence appearing at c or 20c. The first output of the signal sequences A1, A2, etc. is performed immediately after the signals are read, as shown in FIG. clock generators 17, 18 and feedback circuit 19,
Which of the above-mentioned two operation modes of 20 is selected is the same, and in either case, the electronic switch 21 is driven at a cycle of signal trains A1, A2, etc. corresponding to four times the storage frequency _fs . Therefore, the signal train corresponding to these 1/2 images appears at the output terminal 22 at twice the output frequency f _A as desired. The signal waveform appearing at the output 22 of the storage device 2 is shown in FIG. As a result, each image signal A, B, C, etc. is reproduced twice consecutively on the image display surface 4 as shown in FIG. 4, and the output frequency f _A is the storage frequency.
It can be seen that f is twice as much as _S. Figure 5 shows the storage frequency of 16 2/3 images per second.
The case is shown operating at an output frequency of f _S and f _A =25 images/sec. The explanatory diagram and functions are basically the same as those in Figure 4, so a detailed explanation is not necessary.
If the storage frequency is not simply doubled, tripled, etc., but the ratio between the storage frequency and the output frequency is 2:3, 1/2 image A1 or A of each image A, B, etc.
2 or B1 or B2 twice, and the other 1/
The two images appear on the image display screen only once. It should be noted that the alternating first and second 1/2 images appear twice, as is apparent in FIG. In this method, in addition to pure images A, B, and C, a "mixed" image is also reproduced on the image display surface, and the first half of the image is the same as the previous image, as shown in Figure 5. It is equal to the first 1/2 image, and its second 1/2 image is equal to the second 1/2 image of the subsequent image. General relational expression f _A = a/bf _S (where a is the number of signal sequences appearing in one period corresponding to f _S , b
is the number of subimages required to form n complete images), then the above method operates such that a is an integer greater than or equal to 1 and b is equal to 2. There will be. If n is the frequency at which a certain 1/2 image appears at the input terminal 19c or 20c of the electronic switch 21 during one cycle of the frequency _fS , then the relational expression n=2f _A /f _S is obtained. Furthermore, if N is the frequency at which a 1/2 image is stored in the output memory 15 or 16 during one cycle of the frequency _fS , then this value is It depends on which of the two modes of operation mentioned above is chosen. In the first of the two cases above, N
=n-1, in the second case N=n. The frequency n' at which an image appears on the image display surface 4 during one cycle of the frequency f _S is n'=a/b. Therefore, as already explained in FIG. 5, an image consisting of 1/2 images appears even 1 1/2 times;
An image synthesized from images appears on the image display screen even 2 1/2 times, 3 1/2 times, etc. Possible frequency ratio a/
b should be practically achievable; to obtain even finer sections, it is necessary to divide the image into two or more subimages (interlaced scanning), and b should be as small as possible for one complete image. is equal to the number of partial images to be synthesized. 2 partial images per image per second per table
For a practical case of an output frequency f _A of 25 images, the values of various possible storage frequencies f _S , a, b and n are shown.

[Table] The same method is used for two 1/2 images A as above.
The present invention can also be applied when 1 and A2 are input to the input terminal 7 of the storage device 2 one after another (sequential scanning) rather than at the same time. The graphs in Figures 4 and 5 show that as long as the 1/2 image is input to the input terminal 7 at twice the scanning line transmission frequency f _Z , that is, f _S =25 images/sec, if parts a and b are ignored, then correct. This is different from the operation mode of the storage device 2 described above, and needs to be set as follows.
That is, the electronic switch 8 switches at a cycle of 1/2 image,
Furthermore, the scanning line transmission frequency f _{Z ' at which the scanning line signal train is transmitted from the reception storage 11 or 12 to the output storage 15 or 16 is twice the scanning line transmission frequency f Z at} the input terminal 7. However, when inputting partial images sequentially, a storage device 25 as shown in FIG. 2 can also be used.
This storage device 25 includes only one reception storage 26 that is directly connected to the input terminal 7, and one output storage 27 that leads the output terminal 28c of the feedback circuit 28 directly to the output terminal 22. has. Otherwise, the circuit includes clock generators 29, 30, return conductor 31,
With respect to the input terminal 28a and the output terminal 28b of the feedback circuit 28, the memory pair 11 and 15 or 12 of FIG.
This corresponds to 16 circuits. Therefore, the explanation of the corresponding parts will be omitted. The functionality of the storage device 25 according to FIG. 2 is then manifested in a manner similar to that shown in FIGS. 4 and 5. This will be explained based on FIGS. 6 and 7. In this case, in Figure 6, the storage frequency of 12 1/2 images/second is
Also, in FIG. 7, each storage frequency of 16 2/3 images/second is converted to an output frequency of 25 images/second. In figures 6 and 7, symbols A1, A2, B1, B2
etc. have the same meaning as in FIG. 4 or 5, but the signal sequence appearing at the input terminal 7 of the storage device 25 is indicated by . These signal sequences are transmitted from the reception storage 26 to the output storage 27 at a frequency f _Z ' which is twice the scanning line transmission frequency f _Z ' input to the reception storage 26 . Furthermore, the transmission between the two storage devices is such that the initial process of storing two 1/2 images in the output storage device 27 actually ends at the same time as reading the 1/2 image into the reception storage device 26. It will be done. This situation is
As shown by the dash-dotted lines in Figures 6 and 7, the lines in these figures indicate the transmission between both memories. The image frequency of the transmission is equal to the storage frequency _fS . As can be further seen from FIGS. 6 and 7, the signal sequences A1, A2 or B1, B2, etc. corresponding to the partial images are transferred to the feedback conductor 31 and the feedback circuit at the same time as the output storage 27 first reads those signals. 28 to the output end 22. The signal train is shown in FIGS. 6 and 7. This is because, in this mode of operation,
This is because when inputting continuous partial image signals, the regular cycle of the clock generator 30 is followed.
As a result, each image signal is either stored in the output storage 27 only twice in FIG. 6 and 1 1/2 times in FIG. A new signal is input to the output memory via the conductor 31. Furthermore, the formula and table given in Figure 1 can be applied, but the frequency n' at which 1/2 image signal appears at the output end of the feedback circuit is half the value of n, and furthermore, the frequency n' at which 1/2 image signal appears at the output terminal of the feedback circuit is half the value of n, and furthermore, the frequency n' at which 1/2 image signal appears at the output terminal of the feedback circuit is The number of times N'' of storing image signals is equal to n'. FIG. 3 shows a modified embodiment of the storage device of FIG. The image is made up of three sequentially scanned images: an anamorphic red extraction, a green extraction with luminance extraction and an anamorphic blue extraction of the same image (hereinafter R-, Y- and B, respectively).
- image). The input 7 leads to the input of an electronic switch 33 which has two outputs, one of which is connected to the input of the electronic switch 34 and the other to the input of the electronic switch 35. . The latter two electronic switches have three outputs, each receiving memory 11a, 11b, 11c and 12
a, 12b, and 12c. The opening and closing cycles of the electronic switches 33, 34 and 35 are determined by the reception memory 1.
Each R-1/2 image signal is stored in 1a and 12a, each Y-1/2 image signal is stored in 11b and 12b, and each B-1/2 image signal is stored in 11c and 12c, In this case, reception storage devices 11a to 11c
The middle 1/2 image signal corresponds to odd numbered scanning lines, and 12a~
The 1/2 image signal in 12c has an even number of scan lines.
Further, clock generators 13 _ac , 14 _ac and 17 _a
-c and 18 _ac correspond to clock generators 13 or 14 and 17 or 18, and feedback circuits 19d-19
f and 20d-20f correspond to feedback circuits 19 and 20, and feedback conductors _23ac and _24ac correspond to feedback conductors 23 and 24 in FIG. These mutually corresponding parts operate in a manner corresponding to that described in connection with FIG. Therefore, _{R- ,}
Y- and B-1/2 image signals appear in the form of a signal train with a storage frequency f _S and a different output frequency f _A , and from these 1/2 image signals R-, Y- and B, respectively
- An image is produced. The receiving memory 11a-11c or 12a-1 is configured so that these images appear simultaneously.
Two of the circuits 2c are each provided with a delay circuit for time compensation. An encoding circuit 45 that performs R-Y-B encoding is connected between the output end of the feedback circuit in FIG. 3 and the output end 22 of the storage device, and the signal at the output end 22 is directly sent to the television receiver. Can be input. At the input 46, an audio signal can be led to an audio circuit 47, in which the signal available at the output 22 may have an audio component. Finally, FIG. 8 shows another embodiment according to the present invention. This can be connected to the receiving circuit section 37 and the reproducing circuit section 38 of the television receiver, and the scene that is just being performed,
For example, a soccer shot scene can be repeated on the display surface 48 in slow motion. For this reason,
A storage device 25 of the type shown in FIG. 2 is installed, but significantly different from that shown in FIG.
6' has a larger storage capacity than the reception storage 26;
Moreover, it has a storage capacity of, for example, 1500 images. This corresponds to a playback time of one minute at the normal tempo. The input terminal 7 of the storage device 25 can be coupled to the output terminal 37a of the receiving circuit section via a switch 39, while the output terminal 22 can be coupled via a switch 40 to the input terminal 38a of the reproducing circuit section. Furthermore, an electronic switch 41 is provided with which the output 22 can be coupled to the input 7. Finally, in this circuit there is a switching and setting device 42. This device 42 makes it possible to temporarily interrupt the conventional coupling between the output 37a and the input 38a, and at the same time the electronic switch 41, the clock generators 29, 30 and the return conductor 28 are activated. (Control couplings are not shown for simplicity). Further, the clock frequency of the clock generator 29 can be varied by the setting device. The circuit arrangement according to FIG. 8 operates as follows: During normal television reception, input terminal 38a is connected to switch 4.
In addition to connecting to the output end 37a via 2,
It is also connected to the input terminal 7 of the storage device 25 via the opener 39 . As a result, the television picture just received is successively introduced into the reception store 26', which receives the signal of the stored television picture from the input 7 at the output, which is formed by the clock generator 29. It is connected so that when the clock generator 29 is not connected, the signal that comes there disappears. Therefore, memory 2
6' always stores the last received television image each time, and in this case, the last received image is 1500. During normal image reception, switches 40 and 41 are open. If the user of the television receiver wants to see a new scene, especially a shoot scene, in slow motion, he or she is currently watching, he or she operates the switching/setting device 42 immediately at the end of the scene to change the scene. As a result, the direct connection between the output end 37a and the input end 38a is interrupted, and the image immediately disappears from the image display surface. At the same time, switch 39 opens, switch 40 closes, and then electronic switch 41 and the cyclic operation of clock generators 29 and 30 and feedback circuit 28 are started. The clock generator 29 generates 1/2 image A1,
The image signals consisting of A2, B1, B2, etc. are transmitted from the reception store 26' to the output store 27 in the manner described in connection with FIGS. 6 and 7 in connection with FIG.
Therefore, the signals corresponding to the individual images are transmitted many times, for example 2 times or 1 1/2 times (as in Figures 6 and 7),
It appears at the output end 22 and is reproduced on the image display surface 48. An intermediate memory 43 with a clock generator 49 is provided between the electronic switch 41 and the input 7 of the memory 25. This clock generator is put into operation when it is operated by the switching and setting device 42 in the same manner. The electronic switch detects the first two halves of the image signal appearing each time at the output terminal 22.
Since the image signal is passed through the intermediate storage 43, a signal string such as that shown in the sixth or seventh item appears at the input end of the intermediate storage 43. Clock generator 44, whose period can be adjusted in common with clock generator 29, operates as follows. That is, the image signal is received again by the storage unit 26'.
The signal is then input from the receiving circuit section 37 to the receiving memory 26 . That is, the clock generator 44 outputs the image signal from the intermediate storage device 43 at a transmission frequency lower than the scanning line transmission frequency input to the intermediate storage device. As a result, after replaying the case repeatedly, the memory 26' is again in the same state as it was at the beginning of operating the switching and setting device. Each scene can be played on the image display screen many times, and
In the meantime, the clock frequencies of the clock generators 29 and 44 and the electronic switch 41 can be varied in the switching and setting device 42. Therefore, the tempo of slow motion can be made longer or shorter using this method. Advantageously, the clock frequency can be varied to provide multiple selections between normal speed and extreme slow motion.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the first embodiment, the second
The figure is a block diagram of a second embodiment of the storage device;
FIG. 3 is a block diagram of another storage device having an encoding device, and FIGS. 4 to 7 are graphs showing the operational aspects of the storage device according to FIGS. 1 and 2. FIG. 8 shows another modified embodiment. 1: Signal train generator, 11, 12, 26: Reception storage device, 2: Storage device, 13, 14, 17, 18,
29', 30, 44: Clock generator, 3: Signal string converter, 15, 16, 27: Output storage, 4:
Image display surface, 19, 20: Feedback circuit, 5: Video disk, 33, 34, 35: Electronic switch, 6:
Scanning signal converter, 43: intermediate storage.

Claims (1)

[Scope of Claims] 1. A method for storing each signal train corresponding to an individual image or a partial image of an image train at a predetermined storage frequency, and outputting the stored signal train at a reproduction frequency different from the storage frequency, comprising: storing the signal sequence at a predetermined storage speed in a first storage device having a storage capacity corresponding to at least one image or partial image of the image sequence, and outputting the signal sequence at a faster output speed, that is, compressed in time; Furthermore, a method of converting an image frequency in which a signal train is similarly stored at a predetermined signal train frequency in a second memory having a storage capacity corresponding to at least one image or partial image of the image train, and outputted at a higher signal train frequency. In the first memory 11, 12; 11, the same signal string is sequentially stored.
a to 11c, 12a to 12c; 26; 26',
Next, the second storage devices 15, 16; 15a to 15c,
16a to 16c; 27, and these signal sequences are stored in the first storage devices 11, 12; 11a to 11c, 12.
a to 12c; 26; 26' are stored and outputted at the same signal train frequency, while the second storage device 15,
16; 15a to 15c; 16a to 16c; 27; an image frequency conversion method characterized by storing and outputting at the same speed; 2 Second memory device 15, 16; 15a to 15c, 1
6a to 16c; At the same time as outputting the signal string stored in 27, the second storage devices 15, 16; 15a to
15c, 16a to 16c; 27 and then output again, and the signal sequence is stored and reproduced n times (n is 1 or more) before outputting the signal sequence corresponding to the next image or partial image. 2. The image frequency conversion method according to claim 1, wherein the image frequency conversion method is performed (integer). 3 Second memory device 15, 16; 15a to 15c, 1
6a to 16c; while outputting the signal string stored in 27,
or before that, at least the signal sequence corresponding to the next image or partial image is stored in the second storage devices 15, 16; 15a.
15c, 16a to 16c, and 27. The image frequency conversion method according to claim 1 or 2, wherein the image frequency is stored in . 4. Store a predetermined number of signal strings corresponding to a large number of consecutive images or partial images in the first storage device 26', and before outputting these signals, erase the longest stored signal string at a predetermined frequency. 4. The image frequency conversion method according to claim 3, wherein at the same time, a signal string following the last signal string stored at that frequency is stored. 5. In an image frequency conversion device that stores each signal string corresponding to an individual image or partial image of an image string at a predetermined storage frequency, and outputs the stored signal string at a reproduction frequency different from the storage frequency, (a) a signal train generator for generating each signal train corresponding to an individual image or sub-image of the train; (b) having a storage capacity corresponding to at least one image or sub-image of the train of images; (c) a first storage device subsequent to said signal train generator for storing at a storage speed of at least one image or a sub-image of the image sequence; (d) a second storage device which stores the signal sequence at a predetermined storage frequency and outputs it at a higher output frequency; and (d) an image display device following both storage devices which converts the signal sequence into an image or a partial image. and second storage devices 15, 16; 15a to 15
c, 16a to 16c, 27 are first storage units 11, 1 that store and output signal trains at the same signal train frequency;
2; 11a-11c, 12a-12c; 25; 2
6', second storage devices 15, 16; 15a~
15c, 16a to 16c; 27 is an image frequency conversion device characterized in that a storage speed at which the signal string is stored is equal to an output speed at which the signal string is outputted; 6 Second memory device 15, 16; 15a to 15c, 1
6a to 16c; 27 are feedback circuits 19, 20; 19d that update the signal train once or more and output it;
.about.19f, 20d-20f; 28. The image frequency conversion device according to claim 5. 7. The image frequency conversion device according to claim 5 or 6, wherein the first storage device 26' has a storage capacity corresponding to a large number of images. 8 Input end 7 of first memory 26' and second memory 2
8. The image frequency converting device according to claim 7, further comprising an intermediate storage 43 having a clock generator 44 connected between the output terminal 22 of the image frequency converting device and the output terminal 22 of the image frequency converting device. 9 Before inputting the intermediate memory 43, the electronic switch 4
1. The image frequency conversion device according to claim 8, wherein: 1 is connected to the image frequency converting device. 10 First and second storage devices 11, 12, 15, 1
6. An image according to any one of claims 5 to 9, characterized in that the intermediate storage device provided as the case requires comprises two 1/2 image storage devices connected in parallel. Frequency conversion device. 11 Three parallel memory devices each having 1/2 image memory device 11
a~11c, 12a~12c, 15a~15c,
16a to 16c, namely R-1/2 image storage, Y-
11. The image frequency converting device according to claim 10, comprising a 1/2 image storage device and a B-1/2 image storage device. 12 A time delay circuit that compensates for the time difference that occurs when signals are sequentially input to the parallel 1/2 image stores is connected to the parallel 1/2 image stores 11a to 11c, 12a to 12c,
12. The image frequency conversion device according to claim 11, characterized in that the image frequency conversion device is disposed at 15a to 15c and 16a to 16c.