JPH07219512A - Raster scan tv image generation device and composite display method for tv image of high resolution - Google Patents

Abstract

PURPOSE:To provide the composite display system for a TV image of optional resolution such as 1280X1024-line and 60Hz noninterlaced resolution. CONSTITUTION:The system consists of plural raster scan TV image generation devices A and B, one TV image composition device A or B, and a TV monitor. The generation devices A and B reduce a vertical and a horizontal synchronizing signal to 1/4 as high as the original rate and outputs them, and converts bit map data into analog data with a reduced clock 1/4 time as fast as the original clock, thereby outputting a TV video signal. The composition device samples and stores the output TV video signal of each generation device with a clock a little faster than the reduced clock, reads image data out of respective storage parts with the original dot clock and puts them together, and outputs the vertical and horizontal synchronizing signals at the original rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raster scan TV image generator and a high resolution TV image composite display system.

[0002]

2. Description of the Related Art Basically, as shown in FIG. 4, a composite display system of TV images is basically provided with a plurality of raster scan TV image generation devices (two 41a and 41b in the illustrated example) and these devices. One TV image synthesizer 42 and TV monitor 4
3, and computer-generated graphic data and computer-processed video data (including images taken by a TV camera that have been computer-processed).
Is a method of displaying a part of the image on the screen of the TV monitor 43 at the same time.

In FIG. 4, a raster scan TV image generation device 41a and a raster scan TV image generation device 41b respectively include an image memory plane in which corresponding ones of the above-mentioned graphic data and video data are written in a bitmap format, and a bit from the image memory plane. It basically comprises a read circuit for reading out map data by a raster scan method, generating and outputting horizontal and vertical synchronizing signals, and a D / A converter for analogizing read bit map data and outputting a TV video signal.

Therefore, the # 1 and # 2 TV video signals output to the TV image synthesizing device 42 actually consist of a TV video signal, a vertical sync signal, and a horizontal sync signal. Signal = TV video signal. That is, for example, the raster scan TV image generation device 41a
It is assumed that the output TV video signal # 1 of # 1 includes a figure of Δ, and the output TV video signal # 2 of the raster scan TV image generation device 41b is a video signal including a figure of circle surrounded by □.

The TV image synthesizing device 42 has an A / D converter and image memory planes (421, 422) (42) provided in a one-to-one correspondence with the raster scan TV image generating device.
3, 424), a combining operation circuit 425, and a D / A converter 426.

The output TV video signal # 1 of the raster scan TV image generation device 41a is digitized by the A / D converter 421 and written in the image memory plane 422, and similarly, the output TV of the raster scan TV image generation device 41b is output.
The video signal # 2 is digitized by the A / D converter 423 and written in the image memory plane 424.

The synthesis operation circuit 425 takes in image data output from the image memory planes 422 and 424 and inputs parameters from a higher-level device such as a personal computer for synthesis (size, position, synthesis operation, etc.).
The synthesis processing is performed according to the designation of. The composite image data is D
The analog / analog converter 426 converts the analog TV signal into a composite TV video signal according to the raster scan method, and the TV monitor 43
Will be composited and displayed. In the example shown in the figure, the figure of △ and the circle of □
The figure surrounded by is overlaid and displayed.

[0008]

The resolution of a TV image is generally 512 dots × 512 lines or 640 dots × 480 lines (low resolution), and is used in a workstation or the like. Some of them have high resolution such as 1280 dots × 1024 lines. The low-resolution one has a slow refresh rate (vertical sync signal frequency) of 60 Hz for non-interlace and 30 Hz for 2: 1 interlace. In this case, the refresh rate (vertical sync signal frequency) of 421 and 423 in FIG. A low-priced and easily available A / D converter can be used.

On the other hand, in the case of high resolution ones, there are various kinds other than the above at the present stage of development, but when the refresh rate is 60 Hz, the dot rate of the TV video signal reaches as high as 100 MHz, so the above-mentioned low price. The readily available low speed A / D converter cannot be used, and an ECL type high speed A / D converter and high speed image memory must be used. However, the ECL type high-speed A / D converter and the high-speed image memory are custom-made and expensive, and are difficult to obtain.

Therefore, if the composition of the high-resolution TV image is attempted to be realized by the composition of the composition device 42 shown in FIG. 4, there is a problem that the cost becomes very expensive and the practicality ignoring the economical efficiency becomes poor. is there.

On the other hand, if an attempt is made to combine high-resolution TV images with an emphasis on low price, for example, as shown in FIG. 5, an output TV video signal (for example, 1280) of the high-resolution raster scan TV image generation device 51 is displayed. After converting the dot x 1024 lines into a low resolution TV video signal (for example, 640 dots x 480 lines) by the down converter 52, it is digitized by the low-priced and easily available low-speed A / D converter 53 and written in the image memory plane. However, there is also a problem in that it is not possible to faithfully combine the images without degrading the resolution.

The object of the present invention is currently 1280 dots ×
A 1024 line, 60 Hz non-interlaced one is generally used, but such an arbitrary high resolution TV image can be faithfully displayed without using an expensive high speed element and without declining the resolution. It is an object of the present invention to provide a composite display system of resolution TV images and a raster scan TV image generation device suitable for realizing the composite display system.

[0013]

In order to achieve the above object, a raster scan TV image generating apparatus and a high resolution TV image synthesizing display system of the present invention have the following configurations.
That is, the raster scan TV image generation device of the first invention is
An image memory plane for storing computer image data in a bit map format; a circuit for generating an original clock at a speed corresponding to the original dot rate of the computer image to be handled; a speed reduction corresponding to a dot rate lower than the original dot rate A circuit for generating a clock based on the original clock; a circuit for generating a read address of the image memory plane and a horizontal / vertical synchronizing signal according to the reduced clock; There are a format for outputting an analog TV video signal and a format for outputting a digital TV video signal.

A raster scan TV image generating apparatus according to the second invention is an image memory plane for storing computer image data in a bit map format; a circuit for generating an original clock having a speed corresponding to an original dot rate of a computer image to be handled; A circuit for generating a reduced clock having a speed corresponding to a reduced dot rate equal to or lower than the original dot rate based on the original clock; a switch for outputting one of the original clock and the reduced clock as an operation clock;
A circuit for generating a read address of the image memory plane and a horizontal / vertical synchronizing signal in accordance with the operation clock; a circuit for outputting an analog TV video signal; Some types output digital TV video signals.

The high resolution TV image composite display system of the third invention is either the raster scan TV image generation device of the first invention or the raster scan TV image generation device of the second invention using a reduced clock as an operation clock. A TV image synthesizing device for receiving outputs from the plurality of raster scan TV image generating devices;
The image synthesizing device includes a TV image storage unit provided in a one-to-one correspondence with the plurality of raster scan TV image generating devices;
A TV image synthesizing unit that is placed after the plurality of TV image storage units; and the TV image storage unit receives a control clock slightly faster than the reduced clock and performs raster scan corresponding to the control clock. A circuit for outputting a sample clock synchronized with a horizontal / vertical synchronizing signal input from a TV image generating device and generating a write address; and an analog TV video signal input from a corresponding raster scan TV image generating device. An A / D converter that digitizes according to a clock;
An image memory plane for storing the output of the A / D converter in bitmap format according to the write address;
The TV image synthesizing unit generates a dot clock at a speed corresponding to a dot rate when a computer image to be handled is directly output to a predetermined TV monitor, and based on the dot clock, the control clock and the plurality of A circuit for generating a read address for each of the image memory planes and outputting a horizontal / vertical synchronizing signal to an external TV monitor; an image data read from the plurality of image memory planes is fetched in accordance with the dot clocks; And a D / A converter for analogizing the composite image data that has been subjected to the composite processing in accordance with the dot clock and outputting it as a TV video signal to an external TV monitor.

The high resolution TV image synthesizing and displaying system of the fourth invention is one of the raster scan TV image generating device of the first invention and the raster scan TV image generating device of the second invention using a reduced clock as an operation clock. A TV image synthesizing device for receiving outputs from the plurality of raster scan TV image generating devices;
The image synthesizing device includes a TV image storage unit provided in a one-to-one correspondence with the plurality of raster scan TV image generating devices;
A TV image synthesizing unit that is placed after the plurality of TV image storage units; and the TV image storage unit receives a control clock slightly faster than the reduced clock and performs raster scan corresponding to the control clock. A circuit for generating a write address synchronized with a horizontal / vertical synchronizing signal input from the TV image generating device; and a corresponding raster scan T
An image memory plane that stores a digital TV video signal input from a V image generation device in a bitmap format according to the write address; and the TV image synthesizing unit directly outputs a computer image to be processed to a predetermined TV monitor. A dot clock at a speed corresponding to the dot rate, and the control clock and the read addresses for the plurality of image memory planes are respectively generated based on the dot clock, while a horizontal / vertical synchronizing signal is sent to an external TV monitor. And a circuit that outputs
A circuit for taking in the image data read from the plurality of image memory planes according to the dot clock and performing a combining process; and converting the combined image data subjected to the combining process into an analog signal according to the dot clock and outputting it as a TV video signal to an external TV monitor. A D / A converter for
It is characterized by having.

[0017]

Next, the operation of the raster scan TV image generating apparatus and the high resolution TV image synthesizing display system of the present invention configured as described above will be described. As is well known, the TV monitor of a workstation is generally 1280 dots × 102.
High-resolution display is performed by a 4-line TV video signal, and the refresh rate of this TV video signal is usually
60Hz non-interlaced to suppress flicker. And 1280 dots x 1024 lines, 60H
High resolutions higher than z non-interlace are also used, though not common, and 1280 dots x 1024.
Below the line, it can be considered to belong to the category of high resolution.

The high-resolution TV image composite display system of the present invention has a general configuration shown in FIG.
A 1024 line, 60 Hz non-interlaced one is generally used at present, but it is intended to display such an arbitrary high resolution TV video signal on a TV monitor in real time, which is as follows. It was constructed by focusing on such facts.

That is, if the refresh rate is 60 Hz and non-interlaced, the synthesized TV video signal output to the TV monitor by the TV image synthesizer must be 60 Hz non-interlaced.
It should be noted that the TV video signal output from the V image generation apparatus to the TV image synthesis apparatus need not be 60 Hz non-interlaced. Even if the raster scan TV image generation device outputs the TV video signal at 15 Hz or 30 Hz, the resolution is not lowered, and the dot rate required for the TV video signal can be lowered equivalently, which is advantageous. Below, 1280 dots x 102
Since a 4-line, 60 Hz non-interlaced TV video signal is generally used, this will be specifically described below as an example.

The dot rate f _d of 1 dot is expressed by the following formula 1.

[0021]

[Formula 1] f _d ≈ f _v 1280 dots 1024 lines

[0022] This is because there proportional to the refresh rate f _v, refresh rate f _v 1 / 2,1 /
4 ..., the dot rate of the TV video signal given to the TV image synthesizing apparatus can be lowered. Therefore, TV
Even if the A / D converter in the input stage of the image synthesizing apparatus is not high speed, it can be sampled without trouble by a low speed one which is generally easily available.

For example, as expressed by Equation 2,

[0024]

[Formula 2] f _v 1280 1024 = 60 (Hz) ・ 6
40 dots, 480 lines

[0025] when it comes to obtaining the f _v, because it is f _v ≒ 15 Hz, the frequency f _v of the vertical synchronizing signal output from the raster scan TV image generating device to the TV image synthesizer 60
If it is set to 15 Hz instead of Hz, the TV image synthesizer
A 640-dot x 480-line, 60 Hz non-interlaced TV video signal can be digitized by a low-speed A / D converter without any problem, and a high-resolution TV image can be synthesized.

Therefore, in the high resolution TV image composite display system of the present invention, a high resolution TV video signal can be generated and output in a raster scan TV image generation device in accordance with a reduced clock corresponding to the original dot rate at a reduced speed. In the TV image synthesizing device, the sample clock which is slightly faster than the reduced clock is digitized and stored without lowering the resolution, and after synthesizing, the synthesized TV video signal is output to the TV monitor according to the dot clock corresponding to the original dot rate. I am doing it.

Therefore, at present, 1280 dots × 1024
A line, 60 Hz non-interlaced one is generally used, but such an arbitrary high-resolution TV image can be faithfully displayed without using expensive high-speed elements and without lowering the resolution. If the raster scan TV image generation apparatus is configured as in the second aspect of the invention, the high-resolution TV video signal at the original speed can be directly output to the TV monitor, so that it can be used as a single apparatus that is not intended for composition.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. The high resolution TV image synthesizing and displaying method of the present invention includes a plurality of raster scan TV image generating devices (FIG. 1) and a single TV image synthesizing device (FIG. 2), similar to the general configuration shown in FIG. It is composed of a TV monitor (not shown). In this embodiment, the high-resolution TV video signal is set to 1
280 dots x 1024 lines, 60 Hz non-interlaced type is used. This is because it is currently commonly used.

FIG. 1 shows two raster scans T of A and B.
A V-image generating device is shown, which has the same configuration,
The image memory plane 1, the read control circuit 2, and the D / A converter 3 are basically configured.

The image memory plane 1 is 1280 dots × 1024 which is generally used in workstations.
The image data (# 1, # 2) generated by the computer as described above is written in the bit map format and stored in the bit map format as described above. The image data # 1 is written in the image memory plane 1 of the raster scan TV image generation apparatus A, and the image data # 1
2 is written in the image memory plane 1 of the raster scan TV image generation apparatus B.

The read control circuit 2 includes an original dot clock oscillator 21, a dot clock modulo 4 counter 22, and
Basically, the switch 23, the horizontal dot modulo 1280 counter 24, and the vertical line modulo 1024 counter 25 are provided, and the bitmap data is read from the image memory plane 1 by the raster scan method as described below, and the vertical and horizontal lines are read. Synchronous signals (# 1, # 2) are generated.

The original dot clock oscillator 21 generates an original dot clock having a speed corresponding to the original dot rate f _d of the computer image to be handled. In the illustrated example, the rate of the original dot clock is assumed to be equal to the original dot rate f _d for the convenience of the description of the above-mentioned formula 1. This original dot clock is given to the dot clock modulo 4 counter 22 and one switching end a of the switch 23.

Dot clock modulo 4 counter 22
Sets it to 1 based on the input original dot clock (f _d ).
A dot clock (reduced clock) reduced to / 4 is generated ((3) in FIG. 3) and is applied to the other switching end b of the switch 23. The items shown in the mathematical formula 2 are realized.

The switch 23 is manually or automatically switched by a program. The original dot clock (f _d ) applied to one switching end a and the dot clock applied to the other switching end b. Any one of (f _d / 4) is given to the horizontal dot modulo 1280 counter 24 and the D / A converter 3 as an operation clock. In the illustrated example, the operation clock output by the switch 23 is the dot clock (f _d / 4).

Horizontal dot modulo 1280 counter 24
Generates the X address (horizontal read address) of the image memory plane 1 based on the operation clock output from the switch 23, and also generates the horizontal synchronizing signals (# 1, # 2). In the illustrated example, since the dot clock of f _d / 4 is used as the operation clock, the frequency of the horizontal synchronizing signal is f _H / 4 when the original frequency is f _H (FIG. 3 (2)).

Vertical line modulo 1024 counter 25
Generates the Y address (vertical read address) of the image memory plane 1 based on the horizontal synchronizing signal output from the horizontal dot modulo 1280 counter 24, and also generates the vertical synchronizing signals (# 1, # 2). In the illustrated example, the frequency of the vertical synchronizing signal is f _v / if the original frequency is f _v
4, that is, a cycle of 1/15 Hz as described above (Formula 2) (FIG. 3 (1)).

The D / A converter 3 is the image memory plane 1
The n-bit parallel read data (bitmap data) read by the raster scan method is analogized according to the operation clock output from the switch 23, and TV video signals (# 1, # 2) are formed and output.

In the illustrated example, as shown in FIG.
Shows two raster scan TV image generators A and B. Each raster scan TV image generator is 1/15.
A TV video signal for generating an image for one screen is output in sequence of i [0], i [1], i [2], ... For each cycle of Hz.

Here, two raster scans T of A and B are used.
Each of the V image generation devices is provided with an input terminal (not shown) for external synchronization, and for example, as shown in the drawing, the vertical and horizontal synchronization signals # 2 generated by the raster scan TV image generation device B are input to the raster scan TV image. It can be generated in synchronization with the vertical and horizontal synchronizing signals # 1 generated by the generator A. This is to prevent the configuration of the input stage of the TV image synthesizing device (FIG. 2) from becoming complicated.

Two raster scan TVs A and B
The image generating device can output a 60 Hz non-interlaced TV video signal (TV video signal, vertical synchronizing signal, horizontal synchronizing signal) by setting the switch 23 to the switching end a side. That is, it can be used as an independent device for displaying and outputting a computer image directly to a high-resolution TV monitor. In addition, in the case of dedicated synthesis, the switch 23 may be omitted and the output (reduced clock) of the counter 22 may be used as the operation clock.

Next, the TV image synthesizing apparatus, as shown in FIG. 2, corresponds to the raster scan TV image generating apparatus A.
V image storage unit 4 and raster scan TV image generation device B
The TV image storage unit 5 and the TV image synthesis unit 6 are basically configured. A and B raster scans T
In each of the V image generation devices, the switch 23 has a switching end b.
The setting is switched to, and the operation clock is f _d / 4.

The TV image storage units 4 and 5 have the same structure, and basically include a write control circuit 45, an A / D converter 46, and an image memory plane 47.

The writing control circuit 45 receives the control clock from the reading circuit 61 of the TV image synthesizing unit 6 at a speed [(f _d / 4) · k] which is slightly faster than the reduced clock (f _d / 4), The control clock is output to the A / D converter 46 as a sample clock that is synchronized with the horizontal / vertical synchronization signals input from the corresponding raster scan TV image generation device, and at the same time, 1280 dots × 1024 lines for the image memory plane 47. Write address of 1 / 15H
It occurs in each cycle of z.

The A / D converter 46 receives the TV video signal (#) input from the corresponding raster scan TV image generator.
1 and # 2) are digitized in accordance with the sample clock, and n-bit parallel write data is converted into the image memory plane 4
Give to 7.

The image memory plane 47 is of 1280 dots × 1024 lines × n bits, like the image memory plane 1, and stores the output of the A / D converter 46 in the bitmap format according to the write address.

Thus, as shown in FIG. 3 (5), each raster scan TV image generation device stores i [0], i in each of the two TV image storage units at a cycle of 1/15 Hz.
The image data of each screen to be output in order as [1], i [2], ... Are sequentially stored.

Next, the TV image synthesizing unit 6 includes a reading circuit 61.
A combination arithmetic circuit 62 and a D / A converter 63 are basically provided.

The readout circuit 61 has substantially the same configuration as that of the readout control circuit 2 in the raster scan TV image generation apparatus, in which the switch 23 is omitted. That is, in the portion corresponding to the original dot clock oscillator 21, similarly, a dot clock having a speed corresponding to the dot rate f _d of the computer image to be handled is generated. This is a combination calculation circuit 62 and D
Although it is given to the / A converter 63, it becomes an internal operation clock.

Specifically, in the portion corresponding to the counter 22, the above [(f _d / 4) is used based on this dot clock.
Generate a control clock of k]. Further, in the portion corresponding to the counters 24 and 25, a read address of 1280 dots × 1024 lines for the image memory planes of the two TV image storage units 4 and 5 is generated at 60 Hz non-interlace based on this dot clock. On the other hand, it outputs a vertical synchronizing signal (FIG. 3 (7): f _v ) having a cycle of 1/60 Hz and a horizontal synchronizing signal of 1024 lines (FIG. 3 (8): f _H ) to the external TV monitor. In the illustrated example, the rate of the dot clock generated for convenience of the description of Equation 1 is equal to the dot rate f _d as described above.

The composite arithmetic circuit 62 includes two TVs 4 and 5.
Image data (readout data # 1 and # 2) output from the image storage unit by the raster scan method is fetched in accordance with the dot clock of the rate f _d , and is input from a higher-level device such as a personal computer. The composition processing is performed according to the designation of size, position, composition operation, etc.

The D / A converter 63 converts the combined image data output from the combining operation circuit 62 into an analog signal in accordance with the dot clock of the rate f _d , and outputs it as a TV video signal to a TV monitor (not shown).

Thus, as shown in FIGS. 3 (5) and (6), the TV video signal relating to the composite image is four times as fast as that at the time of input from each raster scan TV image generation device, that is, 6 times.
It will be output to the TV monitor with 0 Hz non-interlaced.

As is apparent from the above description, even when the number of the raster scan TV image generation devices is three or more, it is possible to cope with this by providing the TV image storage units by the number corresponding thereto, and 640 dots × 480 lines, 60 Hz. Even if a raster scan TV image generation device that handles non-interlaced image data is included, image synthesis can be performed without any problems.

It should be noted that the D / A converter 3 of the raster scan TV image generating apparatus is omitted and the A / D converter 46 of the TV image synthesizing apparatus is used so as to output a digital TV video signal.
May be omitted and the image data may be directly written in the image memory plane 47.

[0055]

As described above, in the high resolution TV image synthesizing display method of the present invention, the high resolution TV video signal in the raster scan TV image generating apparatus is reduced in accordance with the reduced clock corresponding to the original dot rate. It can be generated and output, and in the TV image synthesizing device, it is digitized and stored without lowering the resolution by the sample clock slightly faster than the reduced clock,
Since the composite TV video signal is output to the TV monitor in accordance with the dot clock corresponding to the original dot rate after composition, a 1280 dot × 1024 line, 60 Hz non-interlaced one is currently common. It is possible to faithfully perform composite display of such an arbitrary high-resolution TV image without using an expensive high-speed element and without lowering the resolution. Therefore, there is an effect that it is possible to easily and economically realize a multimedia-compatible high-resolution display in which a plurality of computer images are simultaneously superimposed on the screen of one TV monitor and displayed in real time. If the raster scan TV image generation apparatus is configured as in the second invention, the high-resolution TV video signal of the original speed can be directly transmitted to the T video signal.
Since it can be output to the V monitor, there is also an effect that it can be used as a single device that is not intended for composition.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a raster scan TV image generation apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration block diagram of a raster scan TV image synthesizing apparatus according to an embodiment of the present invention.

FIG. 3 is a time chart of a high-resolution TV image composite display method of the present invention.

FIG. 4 is a general configuration block diagram of a composite display method of TV images.

FIG. 5 is a configuration block diagram in the case of combining high-resolution TV images at a reduced dot rate.

[Explanation of symbols]

 1 Image Memory Plane 2 Read Control Circuit 3 D / A Converter 4 TV Image Storage 5 TV Image Storage 6 TV Image Synthesizer 21 Original Dot Clock Oscillator 22 Dot Clock Modulo 4 Counter 23 Switch 24 Horizontal Dot Modulo 1280 Counter 25 Vertical Line modulo 1024 counter 45 write control circuit 46 A / D converter 47 image memory plane 61 read circuit 62 composite arithmetic circuit 63 D / A converter A raster scan TV image generation device B raster scan TV image generation device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 5/265 7/00

Claims (9)

[Claims] 1. An image memory plane for storing computer image data in a bit map format; a circuit for generating an original clock having a speed corresponding to an original dot rate of a computer image to be handled; and a reduced dot rate lower than the original dot rate. A circuit for generating a reduced clock of a corresponding speed based on the original clock; a circuit for generating a read address of the image memory plane and a horizontal / vertical synchronizing signal according to the reduced clock; A raster scan TV image generation device. 2. The raster scan TV image generating apparatus according to claim 1, further comprising: a D / A converter that converts the data read from the image memory plane into analog data according to the reduced clock and outputs a TV video signal. A raster scan TV image generation device characterized by the above. 3. The raster scan TV image generating apparatus according to claim 1, wherein the data read from the image memory plane is output as a TV video signal as it is. . 4. An image memory plane for storing computer image data in a bit map format; a circuit for generating an original clock having a speed corresponding to an original dot rate of a computer image to be handled; and a reduced dot rate lower than the original dot rate. A circuit for generating a reduced clock of a corresponding speed based on the original clock; a switch for outputting one of the original clock and the reduced clock as an operation clock; generation of a read address of the image memory plane according to the operation clock and horizontal A circuit for generating a vertical synchronizing signal; and a raster scan TV image generating device. 5. The raster scan TV image generating apparatus according to claim 4, further comprising: a D / A converter that converts the data read from the image memory plane into analog data according to the operation clock and outputs a TV video signal. A raster scan TV image generation device characterized by the above. 6. The raster scan TV image generation apparatus according to claim 4, wherein the data read from the image memory plane is output as a TV video signal as it is. . 7. A raster scan TV image generating apparatus according to claim 2, or a plurality of one or both of the raster scan TV image generating apparatuses according to claim 5, wherein a reduced clock is used as an operation clock; Scan T
A TV image synthesizing device that receives the output of the V image generating device;
The TV image synthesizing device includes a TV image storage unit provided in a one-to-one correspondence with the plurality of raster scan TV image generating devices; and a TV image synthesizing unit provided behind the plurality of TV image storage units. The TV image storage unit receives a control clock slightly faster than the reduced clock and uses the control clock as a corresponding raster scan TV.
A circuit for outputting a sample clock synchronized with a horizontal / vertical synchronizing signal input from the image generating device and generating a write address; and an analog TV video signal input from a corresponding raster scan TV image generating device. Digitize according to A /
A D converter; an image memory plane for storing the output of the A / D converter in a bitmap format according to the write address; and the TV image synthesizing unit directly outputs a computer image to be processed to a predetermined TV monitor. In addition to generating a dot clock having a speed corresponding to the dot rate in the case of performing the above, the control clock and the read address for the plurality of image memory planes are respectively generated based on the dot clock, while the horizontal / vertical direction is supplied to an external TV monitor. A circuit for outputting a synchronization signal; a circuit for taking in image data read from the plurality of image memory planes according to the dot clock and performing a combining process;
The synthesized image data that has been subjected to the synthesis process is analogized according to the dot clock, and external T
A high-resolution TV image composite display method comprising: a D / A converter for outputting to a V monitor; 8. A plurality of raster scan TV image generators according to claim 3 or one or both of the raster scan TV image generators according to claim 6, wherein a reduced clock is used as an operation clock; Scan T
A TV image synthesizing device that receives the output of the V image generating device;
The TV image synthesizing device includes a TV image storage unit provided in a one-to-one correspondence with the plurality of raster scan TV image generating devices; and a TV image synthesizing unit provided behind the plurality of TV image storage units. The TV image storage unit receives a control clock slightly faster than the reduced clock and uses the control clock as a corresponding raster scan TV.
A circuit for generating a write address synchronized with a horizontal / vertical synchronizing signal input from the image generating device; a digital TV video signal input from a corresponding raster scan TV image generating device is stored in a bit map format according to the write address. An image memory plane and;
The TV image synthesizing unit generates a dot clock having a speed corresponding to a dot rate when a computer image to be handled is directly output to a predetermined TV monitor, and based on the dot clock, the control clock and the plurality of image memory planes. And a circuit for generating horizontal / vertical sync signals to an external TV monitor while respectively generating read addresses for the above; and a circuit for taking in image data read from the plurality of image memory planes according to the dot clock and performing a combining process. D / that the synthesized image data subjected to the synthesizing process is analogized according to the dot clock and output as a TV video signal to an external TV monitor
A high-resolution TV image synthesizing display system characterized by including an A converter; 9. A plurality of raster scan TV image generating apparatuses according to claim 7 or claim 8, wherein the respective horizontal / vertical synchronization signals generated by the plurality of raster scan TV image generating apparatuses are supplied to another raster scan TV.
An external input terminal for synchronizing with an image generating device is provided; A raster scan TV image generating device characterized by the above.