JPH09116829A - Multi-screen television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of picture quality in an auxiliary screen when a non-standard signal is inputted to a main screen and when a feeble broadcasting signal is received and to set the synchronous disturbance of the auxiliary screen to be a minimum at the time of a station selection operation. SOLUTION: When a first video signal inputted to a video/macro/deflection processing means (V/C/D) 2 is not standard ow is unstable in a weak electric field, the output terminal C1 of a switch means 16 is switch-controlled from a terminal a1 to b1, Thus, video data in the picture memories 48 of a picture processing means 3 and the picture memory 33 of a picture processing means 5 and the deflection processing of CRT 12 by a deflection processing means 11 are executed by using a second synchronizing signal 6. When the second video signal inputted to V/C/D 4 is not standard or is unstable in the weak electric field, the output terminal C1 of the switch means 16 is switch-controlled from the input terminal b1 to a1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver having a sub-screen function, and more particularly to a television receiver capable of sub-screen synchronization other than the conventional main screen synchronization.

[0002]

2. Description of the Related Art A television screen having a function of displaying a sub screen, which is a second screen, separately from a main screen, is divided into two screens. Then, the one with the function to display the main screen on one side and the sub screen on the other side in approximately the same size has been released.

FIG. 6 is a block diagram showing a configuration example of a conventional television receiver capable of displaying two screens of the same size, one of which is a main screen and the other of which is a sub screen.

In FIG. 6, the video signal for the sub-screen output from the A / V switching means 1 is controlled by the video / chroma / deflection processing means (V / C / D) 4 and the sub-screen control means 15. It is output to the (main screen / sub screen) superimposing means 10 through the sub screen processing means 5. The sub-screen processing means 5 includes an A / D conversion means 31, a data rearrangement means (for memory writing) 32, an image memory 33, a data rearrangement means (for memory reading) 34, and a D / A conversion means 35. The timing of writing the video signal data in the image memory 33 is based on the horizontal synchronizing signal and the vertical synchronizing signal 6 from the video / chroma / deflection processing means 4. Three
The timing of reading the video signal data from the video signal 3 is based on the horizontal synchronizing signal and the vertical synchronizing signal 7 from the video / chroma / deflection processing means 2.

On the other hand, the video signal for the main screen output from the A / V switching means 1 passes through the video / chroma / deflection processing means (V / C / D) 2 and the main screen processing means 36 (main screen / Sub-screen) Output to the superimposing means 10. Further, the main screen processing means 36 includes an A / D conversion means 37, an image memory 3
8 and D / A conversion means 39, the timing of writing the video signal data in the image memory 38 is based on the horizontal synchronizing signal and the vertical synchronizing signal 7 from the video / chroma / deflection processing means 2. The timing for reading the video signal data from the image memory 38 is the same as that at the time of writing.
This is performed based on the horizontal synchronizing signal and the vertical synchronizing signal 7 from the chroma / deflection processing means 2.

The video signal superposed by the superposing means 10 is supplied to the CRT 12,
Is controlled by the deflection processing means 11 which operates on the basis of the horizontal synchronizing signal and the vertical synchronizing signal 7 from the video / chroma / deflection processing means 2.

Next, the operation of the television receiver capable of displaying a sub-screen constructed as described above will be described.

The video signal for the main screen selected by the A / V switching means 1 is subjected to video / chroma processing by the video / chroma / deflection processing means 2 to separate and convert the composite video signal into luminance and color difference signals. , Main screen processing means 36
Is input to Also, video / chroma / deflection processing means 2
Performs the sync separation from the composite video signal to generate the horizontal sync signal and the vertical sync signal 7 and supplies the horizontal sync signal and the vertical sync signal 7 to the main screen processing means 36. The image memory 38 is based on the horizontal sync signal and the vertical sync signal 7. On the other hand, the control of writing and reading of the video data, that is, when the main screen video data is read from the image memory 38, the main screen video data is read at a speed about twice as fast as that at the time of writing, so that the CRT For example, the left half is compressed and displayed in half. Assuming that the sub-screen video data is written to the image memory 4 in real time, the sub-screen video data is read out n times as long as the writing time (n is a positive real number). When performed, the sub-screen image is compressed (or expanded) by a factor of 1 / n.

On the other hand, the video signal for the sub-screen supplied from the A / V switching means 1 is subjected to video / chroma processing by the video / chroma / deflection processing means (V / C / D) 4 to obtain a composite video signal. Are separately converted into luminance and color difference signals and supplied to the A / D conversion means 31. Also video /
The chroma / deflection processing means 4 carries out sync separation from the composite video signal, generates a horizontal sync signal and a vertical sync signal 6, and supplies them to the sub-screen processing means 5. Then, the A / D conversion unit 31 converts the video signal for the sub-screen into a digital signal based on the horizontal synchronization signal and the vertical synchronization signal 6, and a data rearrangement unit (for memory writing) 32.
To the data rearrangement unit (for memory writing) 32
Is a sequence suitable for memory writing, rearranges the digitally converted video signal data sequence for the sub-screen,
The data is output to the image memory 33, and the image memory 33 writes the data sequence after rearrangement of the video signal data sequence for the sub-screen in the memory.

Then, the rearranged data train of the video signal data train for the sub-screen written in the image memory 33 is a data rearranging means (memory read-out) based on the horizontal synchronizing signal and the vertical synchronizing signal 7. 34) is read from the image memory 33 and rearranged (restored) into the video signal data sequence for the sub-screen before the data rearrangement is performed by the data rearrangement means (for memory writing) 32. Is output to the D / A conversion means 35, and D
The / A converter 35 converts (returns) the digital video signal for the sub-screen into an analog signal and outputs the analog signal to the main-screen / sub-screen superimposing means 12.

By the way, the main screen processing means 36 simply compresses the data by a factor of 1/2 for each line, but the sub-screen processing means 5 uses the video / chroma / deflection processing means (V) as described above. / C / D) 4 performs a sync separation from the composite video signal, and a video signal is written to the image memory 33 at a timing synchronized with the generated horizontal sync signal and vertical sync signal 6 to perform video / chroma / deflection. The processing means (V / C / D) 2 performs the sync separation from the composite video signal, and at the timing synchronized with the generated horizontal sync signal and vertical sync signal 7, the data is read at a speed about twice that at the time of writing. The image is compressed to about 1/2 and synchronized with the main screen. Control of writing and reading of the sub-screen video signal to and from the image memory 33 in the sub-screen processing means 5 is performed by control signals 8 and 9 from the sub-screen control means 15.

Also, (main screen / sub screen) superimposing means 10
Is the main screen processing means 36 converted into an analog signal.
The main-screen video signal 13 output from the sub-screen and the sub-screen video signal 14 output from the sub-screen processing means 5 are superimposed. The superimposed video signal is CRT1.
It is supplied to the CRT 12 and projected on the surface of the CRT 12. still,
The deflection processing unit 11 is a video / chroma / deflection processing means (V /
C / D) 2 performs sync separation from the composite video signal, and a deflection operation is performed based on the generated horizontal sync signal and vertical sync signal 7.

By the way, in the above apparatus, since the synchronizing signal separated from the video signal of the main screen is used as the reference signal for the deflection processing and the reading of the video of the sub screen from the image memory, For example, when a non-standard signal such as a game console output is input, or when a weak electric field (weak signal) broadcast signal is received, the separation of the synchronization signal becomes unstable and the image quality of the sub-screen deteriorates (CRT. However, there is a problem in that the deflection scanning becomes unstable. Further, there is a problem (defect) that the synchronization of the sub-screen is disturbed even when the main screen is selected.

[0014]

As described above, in the conventional multi-screen television receiver, the deflection scanning of the CRT or the like is performed using only the sync signal separated from the video signal of the main screen. 1) When a non-standard signal is input to the main screen, (2) When the weak broadcast signal is received, or
(3) There is a problem (defect) that the synchronization of the main screen becomes unstable and the synchronization of the sub screen is disturbed at the time of selecting the main screen.

Therefore, in order to solve such a problem, the present invention may cause deterioration in image quality of the sub-screen even when a non-standard signal is input to the main screen or a weak broadcast signal is received. It is an object of the present invention to provide a multi-screen television receiver that does not exist and can minimize the synchronization disturbance of the sub-screen even when the main screen is selected.

[0016]

According to a first aspect of the present invention, there is provided a multi-screen television receiver having means for inputting video signals of a plurality of systems and a system for separating a synchronizing signal from the plurality of video signals. The video signal is based on a sync separation means, a plurality of systems of image storage means capable of storing and reading each of the video signals supplied as an input, and a write sync signal separated from each of the video signals. Each of them is written in the image storage means, and a video is read from the image storage means on the basis of a read sync signal which is one of the sync signals separated by the sync separation means of the plurality of systems including the write sync signal. A plurality of systems of screen processing control means for reading out signals are provided.

According to a second aspect of the present invention, there is provided a multi-screen television receiver having means for inputting a plurality of systems of video signals and a plurality of systems of sync signal separating means for separating a sync signal from each of the plurality of systems of video signals. A plurality of systems of image storage means for compressing the data of the plurality of systems of video signals in the horizontal direction and / or the vertical direction, and a write synchronization signal separated from each of the plurality of video signals as a reference, Each of the video signals is written in the image storage means, and the image storage is performed with reference to a read sync signal which is one of the sync signals separated by the sync separation means of the plurality of systems including the write sync signal. And a plurality of systems of screen processing control means for reading a video signal from the means.

A multi-screen television receiver according to a third aspect of the present invention is the multi-screen television receiver according to the first or second aspect, wherein the read synchronizing signal is
A switch means is provided which enables selection of one of the plurality of synchronization signals separated by the plurality of systems of synchronization separation means, and one of the plurality of synchronization signals is selected by the switch means. Characterize.

Here, according to the invention described in claims 1 to 3, even when the synchronization of one screen (video) is unstable (the television signal is) or non-standard. The deterioration of the quality of the reading / deflecting process of the other screen (video) can be prevented. Also, the sizes of the plurality of screens can be made variable.

A multi-screen television receiver according to a fourth aspect of the present invention is the multi-screen television receiver according to the third aspect, wherein the plurality of systems of horizontal / vertical compression means are provided for the plurality of video signals. In the case where one video signal is expanded by the first horizontal / vertical compression means, there is provided means for changing the compression ratio of another video signal according to the compression ratio of one of the arbitrary video signals. 4. The multi-screen television receiver according to claim 2, wherein another video signal is compressed by the second horizontal / vertical compression means.

According to the invention described in claim 4, one screen is enlarged at a certain ratio and at the same time the other screen is reduced at the same ratio as the other screen. It is possible to prevent overlapping of parts or all of them.

A multi-screen television receiver according to a fifth aspect of the present invention is the multi-screen television receiver according to any one of the second to fourth aspects, wherein the multi-screen television receiver is separated by the synchronization separating means of the plurality of systems. 1 out of multiple sync signals
The switch means for selecting one of the plurality of horizontal / vertical compression means selects the synchronizing signal separated from the video signal having the smallest compression ratio among the video signals processed by the horizontal / vertical compression means. .

According to the fifth aspect of the present invention, when the compression rates of one screen and the other screen are different,
Since the image signal is read from the image memory and processed such as deflection using the synchronization signal of the larger size video, the image is not affected by the smaller size video signal, so there is little discomfort. A screen display is obtained.

A multi-screen television receiver according to a sixth aspect of the present invention is the multi-screen television receiver according to any one of the first to fifth aspects, wherein the read synchronization signal is the plurality of video signals. The sync signal is independent of the sync signal separated from the signal and is obtained by an independent sync signal generating means.

According to the invention described in claim 6, regardless of the state (signal strength etc.) of the video signal inputted from the video / chroma / deflection processing means etc., it is always stable and
The video signal can be read from the image memory, and the processing such as deflection can be performed.

A multi-screen television receiver according to a seventh aspect of the present invention is the multi-screen television receiver according to any one of the first to sixth aspects, wherein the read synchronizing signal is the plurality of video signals. Among the signals, a sync signal separated from the video signal having the strongest signal level is used.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a multi-screen television receiver of the present invention.

In FIG. 1, the video signal for the second screen output from the A / V switching means 1 is controlled by the video / chroma / deflection processing means (V / C / D) 4 and the sub-screen control means 15. Passing through the screen processing means 5 which has been performed, the superimposing means 10
Output to Further, the screen processing means 5 includes an A / D conversion means 31, a data rearrangement means (for memory writing) 3
2, an image memory 33, a data rearrangement means (for memory reading) 34, and a D / A conversion means 35. The timing of writing video signal data in the image memory 33 is the video / chroma / deflection processing means. The horizontal synchronizing signal and the vertical synchronizing signal 6 from the switch 4 are used to read the video signal data from the image memory 33. The output terminal c1 of the switch means 16 is controlled by the control means (not shown). From the video / chroma / deflection processing means 2 input to the input terminal a1 of the switch means 16, or from the input terminal b1 of the switch means 16. Video / Chroma /
Horizontal sync signal and vertical sync signal 6 from the deflection processing means 4
It is based on either of the above.

On the other hand, the video signal for the first screen output from the A / V switching means 1 passes through the video / chroma / deflection processing means (V / C / D) 2 and the screen processing means 3 and the superimposing means. It is output to 10. Further, the screen processing means 3 includes an A / D conversion means 41 and a data rearranging means (for memory writing).
42, an image memory 43, a data rearranging means (for memory reading) 44, and a D / A converting means 45. The video signal data is written into and read from the image memory 43 at the timing of the video / chroma / deflection processing. It is performed based on the horizontal synchronizing signal and the vertical synchronizing signal 7 from the means 2, and the timing of reading the video signal data from the image memory 43 is the output of the switch means 16 controlled by the control means (not shown). The horizontal sync signal and the vertical sync signal 7 from the video / chroma / deflection processing means 2 input to the input terminal a1 of the switch means 16 output from the terminal c1 or input to the input terminal b1 of the switch means 16 Of the horizontal synchronizing signal and the vertical synchronizing signal 6 from the video / chroma / deflection processing means 4 It is adapted to be carried out on the basis of either.

The video signal superposed by the superposing means 10 is supplied to the CRT 12,
The deflection processing means 11 which operates based on the horizontal synchronizing signal and the vertical synchronizing signal 17 from the output terminal c1 of the switch circuit 16 controls the deflection.

Next, the operation of the television receiver configured as described above and capable of displaying a sub-screen will be described.

Now, the first video signal input from the A / V switching means 1 to the video / chroma / deflection processing means (V / C / D) 2 is nonstandard or unstable due to a weak electric field. In this case, the output terminal c1 of the switch means 16 is controlled by a control means (not shown) so that the horizontal sync signal and the vertical sync signal 7 (first sync signal) generated by the video / chroma / deflection processing means (V / C / D) 2 (first Input signal a to which the sync signal of
From 1, video / chroma / deflection processing means (V / C / D)
A horizontal synchronizing signal and a vertical synchronizing signal 6 (second synchronizing signal) generated by the video / chroma / deflection processing means (V / C / D) 4 are inputted from the second video signal inputted to the numeral 4. Switching control is performed on the input terminal b1.

As a result, the reading of the video data from the image memory 43 of the screen processing means 3 and the image memory 33 of the 5 and the deflection processing of the CRT 12 by the deflection processing means 11 are performed using the second synchronization signal 6. Will be
It is possible to prevent the image quality of the second screen by the second video signal from being influenced by the image quality of the first screen by the first video signal (disturbance of the first synchronization signal).

Conversely, video / video from the A / V switching means 1
When the second video signal input to the chroma / deflection processing means (V / C / D) 4 is non-standard or unstable due to a weak electric field, the control means (not shown) controls
The output terminal c1 of the switch means 16 is video / chroma /
The video / chroma / deflection processing means (V / C) is input from the input terminal b1 to which the horizontal synchronization signal and the vertical synchronization signal 6 (second synchronization signal) generated by the deflection processing means (V / C / D) 4 are input. / D) 2 from the first video signal input to the video / chroma / deflection processing means (V / C / D) 2 and the horizontal synchronizing signal and vertical synchronizing signal 7 (first synchronizing signal) Is switched to the input terminal a1 to which is input.

As a result, the video data is read from the image memory 43 of the screen processing means 3 and the image memory 33 of the screen processing means 5, and the CRT 1 by the deflection processing means 11 is read.
The second deflection processing is performed using the first synchronization signal 7, and the image quality of the first screen by the first video signal is the same as the image quality of the second screen by the second video signal (second (2) Disturbance of the sync signal) can be prevented.

Further, a first video signal input to the video / chroma / deflection processing means (V / C / D) 2 or the video / chroma / deflection processing means (V / C / D) 4
When the tuning operation is performed for any of the second video signals input to the
Control (switching) so as to select, as the synchronization signal output from the output terminal c1 of the switch means 16, the synchronization signal on the side on which the channel selection operation is not performed among the first or second video signals. As a result, it is possible to prevent the other video signal (screen) from being adversely affected by the disturbance of the synchronization signal that occurs during the channel selection operation of one video signal (screen).

FIG. 2 is a block diagram showing a second embodiment of the multi-screen television receiver of the present invention.

FIG. 2 shows an A / D conversion unit 41 and a data rearrangement unit (for memory writing) 4 which constitute the screen processing unit 3 (screen processing unit 48) in the configuration of FIG.
The vertical compression means 47 is inserted between the two
7, a vertical compression rate control means 18 for controlling the number 7 and a data rearrangement means (for memory writing) 42, an image memory 43, and a horizontal compression rate control means 19 for controlling the data rearrangement means (for memory reading) 44 are added. The vertical compression rate control means 18 and the horizontal compression rate control means 19 are controlled from the sub-screen control means 15 by using the control signal 22, and the A / D conversion means 31 constituting the screen processing means 5 (screen processing means 49) is controlled. And data rearranging means (for writing to memory) 3
The vertical compression means 46 is inserted between the two
6, a vertical compression ratio control means 20 for controlling 6, a data rearranging means (for memory writing) 32, an image memory 33,
In addition, a horizontal compression rate control means 21 for controlling the data rearranging means (for memory reading) 34 is added, and the vertical compression rate control means 20 and the horizontal compression rate control means 21 use the control signal 23 from the sub-screen control means 15. It is configured to be controlled by.

With the above-mentioned structure, the sub-screen control means 15 controls the vertical compression rate control means 18 and the horizontal compression rate control means 19 using the control signal 22. Control signal 23 from 15
By controlling the vertical compression rate control means 20 and the horizontal compression rate control means 21 using, it is possible to freely change the size of the first screen and the size of the second screen, respectively. The user can have an optimal screen configuration according to the usage situation.

FIG. 3 is a block diagram showing a third embodiment of the multi-screen television receiver of the present invention.

FIG. 3 shows the screen processing means 4 using the control signal 22 from the sub-screen control means 15 in the configuration of FIG.
8 controls the vertical compression rate control means 18 and the horizontal compression rate control means 19, and similarly controls the control signal 22 from the sub-screen control means 15 through the control signal conversion means 24.
5 is used to control the vertical compression rate control means 20 and the horizontal compression rate control means 21 constituting the screen processing means 49.

With the above-described configuration, for example, when the compression rate of the first screen is set to A times 1/2, the output of the control signal converter 24 is 1/2 times 1 / A. Since the signal indicates the compression rate of, the compression rate of the second screen is 1 /
1 / A times 2 As a result, when one screen is enlarged on the screen, the other is automatically reduced, so that even if the size of one screen is arbitrarily set, the two screens will not overlap. Screen) can be obtained.

FIG. 4 is a block diagram showing a fourth embodiment of the multi-screen television receiver of the present invention.

FIG. 4 shows a structure in which the switch means 16 can be switched by using the control signal 26 from the sub-screen control means 15 in the structure of FIG.

With the above-mentioned configuration, the sub-screen control means 15 displays the image of the larger screen of the first screen and the second screen displayed on the tube surface of the CRT 12. The switch means 1 is used so that the synchronization signal included in the signal is used as a reference signal when the video signal data is read from the image memory 43 and the image memory 33 and the deflection processing of the deflection processing means 11 is performed.
It becomes possible to perform the switching control of No. 6. As a result, the quality of the two-screen image displayed on the tube surface of the CRT 12 is always determined by the quality of the image (screen) on the side that is displayed in a large size, so Even if the video (screen) is degraded, for example, if the video (screen) sync signal is disturbed or other problems occur, it is possible to prevent the entire screen from being affected. Obtainable.

FIG. 5 is a block diagram showing a fifth embodiment of the multi-screen television receiver of the present invention.

FIG. 5 shows that the composite video signal input to the video / chroma / deflection processing means (V / C / D) 2 or the video / chroma / deflection processing means (V / C / D) 4 is synchronously separated. The generated synchronizing signal is not used as a reference signal when the video signal data is read from the image memory 43 and the image memory 33 and the deflection processing of the deflection processing means 11 is performed, and the synchronization signal generating means 27 is newly added.
Is provided and the synchronizing signal 28 generated therefrom is used as a reference signal when the video signal data is read from the image memory 43 and the image memory 33 and the deflection processing of the deflection processing means 11 is performed.

According to such a configuration, the synchronizing signal generating means 27 generates the reference signal when the video signal data is read from the image memory 43 and the image memory 33 and the deflection processing of the deflection processing means 11 is performed. An independent third synchronization signal 28 is used. For this reason,
Radio unstable television input signal (sync signal)
The stable reading of the video signal data from the image memory 43 and the image memory 33 and the deflection processing means 11 without being adversely affected by each other and without being influenced by each other on the first screen and the second screen. It is possible to obtain a reference signal (synchronization signal) for performing the deflection processing of (1), and as a result, a high-quality and stable image (screen) is displayed as a (two-screen) image displayed on the tube surface of the CRT 12. You can always get

In the embodiment of the present invention described above, the two-screen television receiver is described as an example, but the present invention is not limited to this, and a multi-screen television receiver capable of displaying three or more screens is provided. It is possible to apply.

[0050]

As described above, according to the inventions described in claims 1 to 3, the synchronization (television signal) of the first screen (video) is unstable or non-standard. Even in such a case, it is possible to prevent the deterioration of the quality of the reading / deflecting process of the second screen (video), and further to make the sizes of the first and second screens variable. .

According to the invention of claim 4, the first screen is enlarged at a certain ratio and at the same time the second screen is reduced at the same ratio as the first screen. It is possible to prevent a part or all of the above from being displayed in an overlapping manner.

Further, according to the invention of claim 5,
When the compression ratios of the first and second screens are different, the video signal of the smaller size is read because the video signal is read from the image memory and the deflection is performed using the sync signal of the video of the larger size. Since it is not affected by images and the like, a screen display with less discomfort can be obtained.

According to the invention described in claim 6,
Regardless of the stability (signal strength) of the video signal input to the video / chroma / deflection processing means, etc., always in a stable state,
The video signal can be read from the image memory, and the processing such as deflection can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a multi-screen television receiver of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the multi-screen television receiver of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the multi-screen television receiver of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the multi-screen television receiver of the present invention.

FIG. 5 is a block diagram showing a fifth embodiment of the multi-screen television receiver of the present invention.

FIG. 6 shows two screens of the same size, one of which is the main screen,
It is a block diagram which shows one structural example of the conventional television receiver which can display the other as a subscreen.

[Explanation of symbols]

1 ... A / V switching means 2, 4 ... Video / chroma / deflection processing means (V / C
/ D) 3,5 ... Screen processing means 6, 7, 17 ... Sync signal 8, 9 ... Control signal 10 ... (Main screen / sub screen) Superimposing means 11 ... Deflection processing means 12 ... CRT 13, 14 ... Video signal 15 ... sub-screen control means 16 ... switch means 31, 41 ... A / D conversion means 32, 42 ... rearrangement means (for memory writing) 33, 43 ... image memory 34, 44 ... rearrangement means (for memory reading) 35, 45 ... D / A conversion means

Claims (7)

[Claims] 1. A means for inputting video signals of a plurality of systems, a sync separating means for a plurality of systems for separating a sync signal from a plurality of the video signals, and storage and reading of each of the video signals supplied as an input. A plurality of systems of image storage means, and a plurality of video signals are written in the image storage means with reference to the respective write synchronization signals separated from the plurality of video signals. A plurality of screen processing control means for reading a video signal from the image storage means on the basis of a read sync signal which is one of the sync signals separated by the sync separation means is provided as a reference. Screen television receiver. 2. A means for inputting a plurality of systems of video signals, a plurality of systems of synchronization signal separating means for separating a synchronization signal from each of the plurality of systems of video signals, and a plurality of systems of video signal data in a horizontal direction. A plurality of systems of image storage means for compressing in the vertical direction or any one of the directions, and a writing synchronization signal separated from each of the plurality of video signals as a reference, and each of the video signals is written in the image storage means, and the writing is performed. A plurality of systems of screen processing control means for reading out a video signal from the image storage means on the basis of a read synchronization signal which is one of the synchronization signals separated by the plurality of systems of synchronization separation means including a synchronization signal for use with A multi-screen television receiver characterized by being equipped with. 3. The read sync signal comprises switch means for selecting one of the sync signals separated by the sync separators of the plurality of systems, and the switch means selects the plurality of sync signals. 1 out of sync signals
3. The multi-screen television receiver according to claim 1 or 2, wherein one is selected. 4. The plurality of systems of horizontal / vertical compression means comprises means for changing the compression rate of another video signal in accordance with the compression rate of one arbitrary video signal of the plurality of video signals. 4. When one video signal is expanded by the first horizontal / vertical compression means, the other video signal is compressed by the second horizontal / vertical compression means. The described multi-screen television receiver. 5. The video signal processed by the horizontal / vertical compression means of the plurality of systems is provided by the switch means capable of selecting one from the plurality of synchronization signals separated by the plurality of systems of the synchronization separation means. 5. The multi-screen television receiver according to claim 2, wherein a sync signal separated from the video signal having the smallest compression rate is selected from among the video signals. 6. The synchronizing signal for reading is a synchronizing signal obtained by an independent synchronizing signal generating means, which is independent of the synchronizing signals separated from the plurality of video signals. 5. The multi-screen television receiver according to any one of 1 to 5. 7. The synchronizing signal for reading is a synchronizing signal separated from a video signal having the strongest signal level among the plurality of video signals. Or the multi-screen television receiver described in 1.