JPH0631926B2 - Image signal distribution system - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention selects the respective image signals output from a plurality of computers and applies the same to a plurality of monitor CRT display devices (hereinafter abbreviated as monitor CRTs). The present invention relates to an image signal distribution system capable of displaying the image signal of.

[Prior art]

The image signal output as a result of data processing in a computer was suitable for displaying on one CRT. For this reason, it is difficult for many people to see the CRT display at the same time, and there is a drawback that there is no simple method for selecting the outputs from a plurality of computers and displaying them on the CRT.

[Outline of Invention]

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional ones. The image signals from the computers are simultaneously displayed on the respective monitor CRTs, and at the same time, the selected image signals from the plurality of computers are selected. The image signals of the above are switched and displayed on each monitor CRT.

Example of Invention

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
(1a), (2a), (6a), (10a) are computers A, B, C,
In the embodiment shown in the figure, these computers are small computers called a personal computer, and (2) is a distributor.
(1b) to (13b) are monitor CRTs. In the embodiment shown in FIG. 1, the monitor CRT (1b) is controlled by the computer A (1a), and the monitor CRT (3b), (4b), (5b) are the computer B (2a) or the computer A (1a). ), Monitor CRT (7b), (8b), (9b)
Is controlled by computer C (6a) or computer A (1a) and is monitored.
CRT (11b), (12b), (13b) is computer D (10a) or computer A (1
controlled by a). (1c), (2c), (6c),
(10c) is a buffer amplifier circuit which amplifies a video signal and a synchronizing signal for each image signal input from each computer, and (2d), (6d) and (10d) are changeover switches.

The image signal is separated into red, green and blue color video signals,
It is usually separated into a horizontal sync signal and a vertical sync signal.In this case, all the switches (2d), (6d), (10d) have a number of contacts corresponding to the separated signal type. Although required, one contact is representatively shown in FIG. As shown in FIG. 1, the output of the computer A (1a) can be output to all monitor CRTs by switching the switches (2d), (6d), (10d).
, But the output of computer B (2a) is monitor CRT (3
Only b), (4b), (5b) can be entered. Computer C (6a), D (10a)
The same applies to the output of. Switch (2d), (6d), (10
d) is called simultaneous control when all switches are connected to the right contact, and distributed control is when all these switches are connected to the left contact.

Further, if the change-over switches (2d), (6d), (10d) are connected to the left and right contacts in a scattered manner, intermediate control of simultaneous and divided control is performed. FIG. 2 is a connection diagram showing the configuration of the changeover switch (2d) of FIG. 1, in which the same reference numerals as those in FIG. 1 denote the same parts, (24) is a switch, and (25) is a not gate. , (2
6) and (27) are AND gates, and (28) is an OR gate. The structure of the changeover switches (6d) and (10d) can be the same as that shown in FIG. Changeover switch in some cases
Of (2d), (6d) and (10d), the switch (24) is provided only for the changeover switch (2d), and the knot gate (equivalent to (25)) in the changeover switches (6d) and (10d) is provided. And the AND gate (equivalent to (27)) has the switch (24) in the changeover switch (2d).
The output of can be connected. In this case, switch (2
Switch (2d), (6d), (10
d) becomes the same as when respectively switched, and the switch (24)
If the output logic is 0, then the control is Ichisai, and if it is 1, the control is distributed.

As described above, the image signal output from the computer can be displayed on the plurality of monitor CRTs. By distributing the audio signal at the same time as distributing the image signal and displaying the image on the monitor CRT to which the audio device is connected, and synchronizing the display of this image with the voice narration, the audiovisual educational material can be constructed.

Note that this image signal distribution system transfers information for generating image signals between computers, and then, in the computer that receives the information, unlike the case where image signals are generated, it is displayed on a monitor CRT. Since the image signal that is being displayed is amplified and distributed, the signal processing on the computer that receives the image signal is not necessary, and the monitor
The structure of the CRT can be simplified and the hardware cost can be comprehensively reduced.

Although Fig. 1 shows the case where four computers generate image signals and 13 monitor CRTs (1b) to (13b), it is easy to add more computers and monitor CRTs. is there.

〔The invention's effect〕

As described above, according to the present invention, an image signal can be simultaneously displayed from a computer on a plurality of monitor CRTs, and a specific image signal selected from among the image signals from the plurality of computers can be switched to each monitor CRT. Can be displayed with.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a connection diagram showing the configuration of the changeover switch shown in FIG. (1a), (2a), (6a), (10a) …… Computers, (1b) to (13b) …… Monitor CRTs, (1c), (2c), (6c),
(10c) ... Buffer amplifier circuit, (2d), (6d), (10d)
...... Each switch is switched. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Takahashi 8-1-1 Tsukaguchihonmachi, Amagasaki City, Hyogo Prefecture Itami Works, Sanryo Electric Co., Ltd. (56) References Japanese Patent Publication Sho 50-32009 (JP, B1)

Claims (1)

[Claims] 1. A first computer that outputs a first image signal, a first buffer amplifier circuit that amplifies a video signal and a synchronizing signal for an image signal input from the computer, and a signal from this buffer amplifier circuit is displayed. A first cathode ray tube display device, a plurality of second computers that respectively output a second image signal, a plurality of second buffer amplifier circuits that amplify a video signal and a synchronization signal for each image signal input from each computer, First and second input to each buffer amplifier circuit
Image signal distribution system including a plurality of second cathode ray tube display devices for respectively displaying the signals from the respective second buffer amplifier circuits.