JPH05176229A - Multi-input video signal display device - Google Patents

Abstract

PURPOSE:To display plural video pictures resulting from plural asynchronous video signals while being superimposed onto a personal computer picture. CONSTITUTION:A picture processing unit is formed 1st, 2nd video signal input terminals, a video signal output terminal, a picture processing means implementing picture processing and scanning conversion processing and a changeover control means onto a printed circuit board, plural picture processing units (boards 10,30,50) are connected in series so as to connect the video output terminal of the picture processing unit of the pre-stage to the 2nd video signal input terminal, a monitor 74 is connected to a video signal output terminal of the picture processing unit of the end stage, video signals (1),(2),(3) inputted to the 1st video signal input terminal are processed by the monitor 74 and the resulting plural patterns and the picture of a personal computer are displayed on the monitor superimposingly. Thus, plural asynchronous video pictures are displayed onto the picture of the personal computer with synthesis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor, which is an output device for a computer, by combining an image processing unit (for example, a video card) with a computer (for example, a personal computer). The present invention relates to an improvement of a multi-input video signal display device for displaying (superimposing) a plurality of screens in an overlapping manner.

[0002]

2. Description of the Related Art Conventionally, a multi-input video signal display device of this type has a slot (for example, a video card slot) provided on the back side of a main body of a personal computer (hereinafter simply referred to as a personal computer), or An image processing unit is inserted and connected to a slot of an expansion unit connected to a personal computer body, and an NTSC video signal from a TV broadcasting station, a TV camera or a VTR (video tape recorder) is connected to a video signal input terminal of the image processing unit. The video signal from this video signal was input, and the video image from this video signal was superimposed on the personal computer image from the personal computer and displayed on the personal computer monitor.

At this time, the image processing unit was formed as follows. That is, a video signal input terminal, a video signal output terminal, and a bus coupling terminal are provided on the board, and the video signal input to the video signal input terminal is further digitized on this board to reduce / enlarge the display screen and display position. Image processing means for performing an image processing process for instructing and a scan conversion process for converting the scanning frequency;
It is formed by providing a switching control means for switching between an analog signal of the video data processed by the image processing means and a video signal from a personal computer via a bus coupling terminal and outputting the video signal to a video signal output terminal. It was Then, a single monitor connected to the video signal output terminal side of the image processing unit is designed to display a video image of a predetermined size in a superimposed manner at a predetermined position of a personal computer image.

[0004]

However, the conventional image processing unit has only one video signal input terminal for inputting a video signal, and the video signal from the personal computer is input to the image processing unit via the bus coupling terminal. Since it is configured to be input to the computer, it is impossible to superimpose and display a plurality of video images on the personal computer image using the image processing unit.

A device is also known in which a plurality of video images are superposed and displayed on a personal computer image.
Since it was designed to synchronize multiple video signals and input them to a personal computer, it is not possible to superimpose and display multiple video images from multiple video devices that do not have sync terminals on the personal computer image. There was a problem.

The present invention has been made in view of the above problems, and provides a multi-input video signal display device capable of displaying a plurality of video images of a plurality of asynchronous video signals on a personal computer image in a superimposed manner. The purpose is that.

[0007]

In a multi-input video signal display device according to the present invention, first and second video signal input terminals, a video signal output terminal and a bus coupling terminal are provided on a substrate, and the first video signal input is provided. Image processing means for digitizing a video signal input to a terminal to perform image processing processing for reducing / enlarging a display screen and designating a display position and scanning conversion processing for converting a scanning frequency, and the image processing means. And a signal obtained by analogizing the video data processed by
An image processing unit is formed by providing switching control means for switching the video signal input to the video signal input terminal and outputting the video signal to the video signal output terminal to form an image processing unit. A plurality of image processing units are connected in series so as to be connected to the second video signal input terminal of the image processing unit, and the bus of the computer is connected to the bus connection terminals of the plurality of image processing units. A monitor is coupled to a video signal output terminal of the image processing unit, and the first of the plurality of image processing units is connected.
A plurality of screens by the video signal input to the video signal input terminal and a screen by the video signal input from the computer to the second video signal input terminal of the first stage image processing unit are displayed on the monitor in an overlapping manner. It is characterized by doing so.

[0008]

The control command from the computer is sent to each image processing unit via the bus connection terminal. The video signal input to the first video signal input terminal of each of the plurality of image processing units is digitized by the image processing means in each unit, and an image for reducing / enlarging the display screen or instructing the display position is displayed. Processing processing and scanning conversion processing for converting the scanning frequency are performed,
Further, it is switched by the switching control means and output to the video signal output terminal.

The video signal from the computer is input to the second video signal input terminal of the first stage image processing unit, and the video signal is switched to the video signal input to the first video signal input terminal by the switching control means in the unit. Output to the signal output terminal. The video signal output to the video signal output terminal of the image processing unit other than the final stage is input to the second video signal input terminal of the subsequent image processing unit and output to the video signal output terminal of the final image processing unit Outputs to the monitor. Therefore, the monitor has a plurality of screens based on the video signals input to the first video signal input terminals of the plurality of image processing units and a video signal input from the computer to the second video signal input terminals of the first stage image processing unit. It is displayed by overlapping with the screen by.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a multi-input video signal display device according to the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration diagram of the present invention, in which 10, 30, 5 are shown.
Reference numeral 0 is an image processing unit (for example, a video card).
The image processing unit 10 includes first and second video signal input terminals 14 and 16, a video signal output terminal 18 and a bus coupling terminal 20 provided on the board 12, and the first video signal provided on the board 12. An image processing means 22 for digitizing a video signal input to the input terminal 14 to perform image processing for reducing / enlarging a display screen and designating a display position and scanning conversion processing for converting a scanning frequency. By switching the changeover switch circuit 24 provided on the substrate 12, a signal obtained by analogizing the video data processed by the image processing means 22 and a video signal input to the second video signal input terminal 16 are switched. And a switching control means 26 for outputting to the video signal output terminal 18.

The image processing units 30 and 50 are similar to the image processing unit 10 in that the first and second video signal input terminals 34, 54 and 36 provided on the substrates 32 and 52, respectively.
56, video signal output terminals 38, 58 and bus coupling terminals 40, 60, and image processing means 42, 62, changeover switch circuits 44, 46 and changeover control means 46, 66 provided on the substrates 32, 52. is doing.

The image processing units 10, 30, 50
Are connected in series so that the video signal output terminals 18 and 38 in the front stage are connected to the second video signal input terminals 36 and 56 in the rear stage. A general-purpose bus 72 of a personal computer (hereinafter simply referred to as a personal computer) 70, which is an example of a computer, is coupled to the bus coupling terminals 20, 40, 60 of the image processing units 10, 30, 50. ing. The video signal from the personal computer 70 is coupled so as to be input to the second video signal input terminal 16 of the first stage image processing unit 10.

The first video signal input terminals 14, 34, 54 of the image processing units 10, 30, 50 have, for example,
Corresponding devices are coupled so that mutually asynchronous video signals from a TV broadcasting station, TV camera, VTR, etc. are input. The video signal output terminal 58 of the last-stage image processing unit 50 is connected to a monitor (for example, a CRT) as an output device.
Display) 74 is attached.

The connection relationship between the personal computer 70 and the image processing units 10, 30, and 50 shown in FIG. 1 is specifically a slot (for example, a video card slot) formed on the back side of the main body of the personal computer 70 or a personal computer. In the slot of the expansion unit coupled to 70, the image processing units 10, 30,
It is formed by inserting and coupling 50.

The image processing unit 10 is specifically constructed as shown in FIG. That is, the first video signal input terminal 14 has an AGC (automatic gain control) circuit 76, an A / D (analog / digital) conversion circuit 78,
A Y / C (luminance signal / color signal) separation circuit 80, an AFC (automatic frequency control) circuit 82, a clock conversion circuit 84, and an RGB matrix circuit 86 are sequentially connected. An image memory 94 is coupled to the output side of the RGB matrix circuit 86 via BFs (buffers) 88, 90 and 92, and the output side of the image memory 94 is passed through a D / A (digital / analog) conversion circuit 96. Is connected to one input side of the analog switch circuit 98.

A timing signal transmission line 100 and a video signal transmission line 102 are coupled to the second video signal input terminal 16, and the timing signal transmission line 100 is coupled to the timing signal side of the video signal output terminal 18. The video signal transmission line 102 is coupled to the other input side of the analog switch circuit 98 via an amplifier 103.
The output side of the analog switch circuit 98 is coupled to the video signal side of the video signal output terminal 18.

A gate circuit 10 is provided at the bus coupling terminal 20.
4 and FIFO (First-In First-O
ut) The microcomputer 108 is connected via the circuit 106, and the memory controller 112 is connected to the microcomputer 108 via the serial bus 110. Opening and closing of the gate circuit 104 is controlled by an AD (address) decoder 116 which decodes a unit address (for example, a card address) of the image processing unit 10 set by a DIPSW (dip switch) 114. To be done. The serial bus 110 is coupled to the control terminals of the Y / C separation circuit 80, the AFC circuit 82, the clock conversion circuit 84 and the RGB matrix circuit 86.

A sync separation circuit 118 is coupled to the output side of the AGC circuit 76, and the sync separation circuit 118 outputs a sync signal to the WVSYNC terminal of the microcomputer 108 and the write system VSYNC terminal of the memory controller 112. is doing. The timing signal output from the Y / C separation circuit 80 is configured to be input to the WFLD terminal of the microcomputer 108 and the FLD and CLK terminals of the write system of the memory controller 112. The A
The timing signal output from the FC circuit 82 is configured to be input to the write system HSYNC terminal of the memory controller 112.

The timing signal transmission line 100 has one
It is coupled to the CLK terminal of the read system of the memory controller 112 through the 1/2 frequency dividing circuit 120 and the CLK selection circuit 122, and further, the read of the memory controller 112 is performed through the FLD discrimination circuit 124. It is connected to the FLD terminal of the system, and is also directly connected to the VSYNC terminal and the HSYNC terminal of the lead system of the memory controller 112.

The memory control terminal of the memory controller 112 is connected to the control terminal of the image memory, and the (video image / personal computer image) switching terminal is connected to the control terminal of the analog switch circuit 98. The image processing units 30 and 50 are, specifically, the image processing unit 10.
Configured similarly to

Next, the operation of the above embodiment will be described with reference to FIG. (A) First video signal input terminal 1 of the image processing unit 30
The video signal input to the A.D.
AFC circuit 82, clock conversion circuit 84, RGB matrix circuit 86 and BF8 are separated into signals and C signals.
It is written in the image memory 94 via 8, 90 and 92.

(B) At this time, a control command from the personal computer 70 is input to the microcomputer 108 via the bus coupling terminal 20, the gate circuit 104 and the FIFO 106, and the microcomputer 108 outputs Y / Y via the serial bus 110.
C separation circuit 80, AFC circuit 82, clock conversion circuit 8
4, RGB matrix circuit 86 memory controller 1
A control signal is input to 12 and a memory controller 11
Since the sync signal from the sync separation circuit 118, the timing signal from the Y / C separation circuit 80, and the timing signal from the AFC circuit 82 are input to the timing signal input terminal of the write system 2 of FIG. Image processing and scan conversion processing are performed.

(C) That is, the process of changing the reduction rate / enlargement rate of the display screen is performed by the conversion of the sampling frequency by the clock conversion circuit 84. Further, by the writing control by the memory controller 112, the writing of the digital video signal in the image memory 94 is performed in synchronization with the synchronizing signal of the video signal input to the first video signal input terminal 14.

(D) Next, the memory controller 112
A digital video signal is read from the image memory 94 by read control by the D / A conversion circuit 96.
Is input to one input side of the analog switch circuit circuit 98 via. At this time, the control command from the personal computer 70 sends the bus coupling terminal 20, the gate circuit 104 and the FI.
The signal is input to the microcomputer 108 via the FO 106, a control signal is input from the microcomputer 108 to the memory controller 112 via the serial bus 110, and the read timing signal input terminal of the memory controller 112 is connected to the memory controller 112. The personal computer 7 input through the second video signal input terminal 16
Since the timing signal from 0 is input, predetermined image processing processing and scan conversion processing are performed.

(E) That is, the memory controller 11
A process of changing the reduction ratio / enlargement ratio of the display screen is performed according to the read timing of 2. Further, a digital video signal is read out from the image memory 94 in synchronization with the synchronization signal of the personal computer signal input to the second video signal input terminal 16. Therefore, the video signal is converted into a scanning frequency that matches the scanning frequency of the personal computer signal, and reaches the analog switch circuit 98 as a synchronized signal.

(F) The analog switch circuit 98 is (video image / personal computer image) from the memory controller 112.
Based on the switching control signal, the video signal subjected to the predetermined image processing and the personal computer signal are switched at a predetermined timing and output to the video signal output terminal 18. Therefore, the video signal output terminal 18 outputs a video signal, which is displayed on the monitor 74 as a screen display in which a video image is superimposed on a personal computer image as shown in FIG.

(G) The video signal output from the video signal output terminal 18 of the first-stage image processing unit 10 is input to the second video signal input terminal 36 of the second-stage image processing unit 30, and this image processing unit A video signal is input to the first video signal input terminal 34 of 30. The second-stage image processing unit 30 operates in the same manner as the first-stage image processing unit 10, so that the video signal output terminal 38 is
When the image is displayed on the monitor 74, a video signal which is a screen display in which a video image is superimposed on a personal computer image as shown in FIG. 3B is output.

(H) The video signal output from the video signal output terminal 38 of the second stage image processing unit 30 is input to the second video signal input terminal 56 of the final stage image processing unit 50, and this image processing is performed. A video signal is input to the first video signal input terminal 54 of the unit 50. Since the image processing unit 50 in the last stage operates in the same manner as the image processing unit 10 in the first stage, the monitor 74 uses the video signal output from the video signal output terminal 58 thereof, as shown in (c) of FIG. Display the screen in which the video image is superimposed on the computer image.

In the above embodiment, the case where three image processing units are connected in series has been described, but the present invention is not limited to this, and it goes without saying that the present invention can be used when a plurality of image processing units are connected in series. is there.

[0030]

As described above, in the multi-input video signal display device according to the present invention, the image processing unit is provided with the first and second video signal input terminals and the video signal output terminal, and the video output of the preceding image processing unit is performed. Since a plurality of image processing units are connected in series so that the terminal is connected to the second video signal input terminal of the image processing unit in the subsequent stage, and the monitor is connected to the video signal output terminal of the image processing unit in the last stage, this monitor According to a plurality of screens by the video signal input to the first video signal input terminals of the plurality of image processing units, and a screen by the video signal input from the computer to the second video signal input terminal of the first stage image processing unit. It can be displayed superimposed.

Moreover, each image processing unit is
Image processing means for digitizing a video signal input to the first video signal input terminal to perform an image processing process for reducing / enlarging a display screen and instructing a display position and a scan conversion process for converting a scanning frequency. Since there is provided switching control means for switching between the analog signal of the video data processed by the image processing means and the video signal input to the second video signal input terminal and outputting it to the video signal output terminal. , Even if the plurality of video signals input to the first video signal input terminals of the plurality of image processing units are not synchronized with each other, or
Even if these plurality of video signals are not synchronized with the video signals from the computer, a plurality of screens can be synchronously superimposed and displayed on the same monitor. That is,
By a monitor of a computer (for example, a personal computer), a plurality of asynchronous video images can be combined and displayed on a screen (for example, a personal computer image) of the computer.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a multi-input video signal display device according to the present invention.

FIG. 2 is a block diagram showing a specific example of the image processing unit shown in FIG.

FIG. 3 is an explanatory diagram illustrating the operation of FIG. 1.

[Explanation of symbols]

10, 30, 50 ... Image processing unit, 12, 32,
52 ... Board, 14, 34, 54 ... First video signal input terminal, 16, 36, 56 ... Second video signal input terminal, 18,
38, 58 ... Video signal output terminals, 20, 40, 60 ...
Bus connection terminals, 22, 42, 62 ... Image processing means, 2
4, 44, 64 ... Changeover switch circuit, 26, 46, 66
... switching control means, 70 ... personal computer, 74 ... monitor, 84
... clock conversion circuit, 94 ... image memory, 98 ... analog switch circuit, 108 ... microcomputer, 112 ... memory controller.

Claims (1)

[Claims] 1. A display screen is reduced by digitizing a video signal input to the first video signal input terminal while providing first and second video signal input terminals, a video signal output terminal and a bus coupling terminal on a substrate. Image processing means for performing image processing processing for instructing enlargement or display position and scanning conversion processing for converting scanning frequency, a signal obtained by analogizing the video data processed by the image processing means, and the first signal. (2) An image processing unit is formed by providing switching control means for switching the video signal input to the video signal input terminal and outputting the video signal to the video signal output terminal to form an image processing unit. A plurality of image processing units are connected in series so as to be connected to the second video signal input terminal of the subsequent image processing unit, and a bus connection end of the plurality of image processing units is connected. Is connected to a computer bus, and a monitor is connected to the video signal output terminal of the last-stage image processing unit, and a plurality of video signals are input to the first video signal input terminals of the plurality of image processing units. A multi-input video signal, characterized in that a screen and a screen based on a video signal input to the second video signal input terminal of the first-stage image processing unit from the computer are superimposed and displayed on the monitor. Display device.