JPS5922486A - Automatic switching system - Google Patents

Abstract

PURPOSE:To attain the automatic switching, by providing synchronizing separating circuits and trigger generating means being the same number as that of video sources and driving a switch connecting the video source to a monitor with an output of a trigger generator. CONSTITUTION:The video source 1-3 such as VTR and video disc are connected respectively to a television receiver 5 via switches SW1-SW3 of a switching control section. The output of the video sources 1-3 is transmitted respectively to synchronizing separation circuits 6-8, and the separated synchronizing signals are outputted to one-shot trigger generators 9-11. In operating a reproducing key of the video source 1, the synchronizing separation circuit 6 and the one-shot trigger generator 9 are operated, and a trigger signal is transmitted to a microcomputer 13 via a key matrix. The microcomputer 13 turns on the SW1 and turns off the SW2 and SW3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic switching system that allows automatic function switching by only one key operation or function key operation of a system controller.

In the past, in order to display two or more video sources on a television receiver, it was necessary to switch the wiring for each. Therefore, the operation becomes complicated.

The present invention is based on the above (DAK) concept, and provides an automatic switching system that can perform automatic function switching with only one key operation on a video device or a function key operation on a system controller, and is capable of simplifying operation. The purpose is to

Embodiments of the automatic switching system of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of one embodiment. In FIG. 1, 1 to 3 are video sources, respectively. The video tape recorder (hereinafter referred to as VTR) is a video disc, and video signals are output from the video tape recorder 1.2 and the video disc 3, respectively.

The video signals from these VTRs 1 and 2 and the video disc 3 are transferred to switches S in the switching control section 4, respectively.
The buttons are arranged to send the signal to the television receiver 5 via WI to SW3 (semiconductor switches such as h transistors). This television receiver 5 is for monitoring the signal switched by the switching control section 4.

Further, the video signals outputted from the VTRI 2 and the video disc 3 are respectively sent to the synchronization separation circuits 6-8. These synchronization separation circuits 6-8 are configured to separate synchronization signals included in each video signal and output the separated synchronization signals to one-shot trigger generators 9-11. The outputs of the trigger shot trigger generators 9 to 11 are sent to a keypad IJTx circuit 12. This key matrix circuit 12 is integrated into a microcomputer 13.
3 to respectively control the switches 5WIS-8W3.

Next, the operation of the automatic switching system of the present invention configured as described above will be explained. V serving as a video source
For example, among the TRI, 2 and video discs 3,
When a playback key (not shown) of VTR'1 is operated, a video signal is output from this VTRI.

This video signal is sent to the synchronization separation circuit 6. This synchronization separation circuit 6 separates the synchronization signal contained in the video signal, and this separated synchronization signal is sent to the one-shot trigger generator 9.

This triggers the one-shot trigger generator 9 and sends a trigger signal to the key matrix n.

When the key matrix I 21C trigger signal is input, a signal is sent from the key matrix 12 to the microcomputer 13.Based on this signal, the microcomputer 13 detects that VTRI has been selected, and switches the switch SWI. outputs a control signal to turn on this switch SW1, and also turns on switch SW2.
, SW3 are turned off. In this, Ichigo, VTR
The video signal output from I is sent to the television receiver 5 through the switch SWl, and the television receiver IK reproduces and displays the video based on the video signal from the VTRI.

Similarly, when VTR2 is selected, the microcomputer 13 turns on the switch Sw2,
A video signal output from the VTR 2 is reproduced on a television receiver 5. The same applies when video disc 3 is selected.

In this way, by operating the playback key of the video source, it is possible to automatically switch the output of the video source and reproduce the image on the television receiver.

FIG. 2 is a circuit diagram showing a second embodiment of the automatic switching system of the present invention. In FIG. 2, in order to avoid duplication, parts that are the same as those in FIG. 1 will be given the same reference numerals and their explanations will be omitted, and parts that are different from those in FIG. 1 will be mainly described.

As is clear from comparing FIG. 2 with FIG. 1, there is only one video source, ie, VTRI.

The VTR 2 and video disc 3 are also provided with start and stop control circuits 1a, 2a, and 3a, respectively, and control signals are sent from the microcomputer 113 to the control circuits 1a, 2a, and 3a, respectively. It has become.

The microswitch 13 also includes tact keys 14a to 14 as function keys of the system controller.
A cross section of tact keys 14a to 14c is provided as shown in FIG. 3. This tact key 14a~
14c corresponds to VTRI, VTR2, and video disc 3. The other configurations are the same as in FIG. 1.

Next, the operation of the embodiment shown in FIG. 2 will be explained. first,
Assume that VTRI is selected.

Next, assume that the tact key 14b of the VTR 2 is selected. In this case, as in the embodiment of FIG. 1, the microcomputer 413 outputs a control signal to turn off the switches SWI and SW3, and
A control signal to turn on switch SW2 is sent to switch SW2.

At this time, the microcomputer 13 further sends a stop signal to the control circuit 1aK, and simultaneously sends a stop signal to the control circuit 1aK.
Send a start signal to a.

Accordingly, the control circuit 1a puts the VTRI in the stop state, and the control circuit 2a puts the VTR 2 in the start state. VT
When R2 enters the start state, the video signal is sent to the television receiver 5 through the switch SW2, and the video is reproduced.

In addition, the tact key 14 of the microcomputer 13
When c is pressed, switches SWI and SW2 are activated according to the control signal from the microcomputer 13.
are both turned off, and switch SW3 is turned on. At the same time, a stop signal is sent to the control circuits ia and 2a, and a start signal is sent to the control circuit 3a. As a result, both the VTRI and VTR2 are in the stopped state, and the video disc 3 is in the starting state.
A video signal from this video disc 3 is sent to the television receiver 5 through a switch SW3, and the video is displayed.

As described above, according to the automatic switching system of the present invention,
Video signals from a plurality of video sources that generate video signals are sent to a synchronization separation circuit to extract a synchronization signal.8) This synchronization signal drives a trigger generation means and inputs it to a microcomputer. Turn on only the switch corresponding to the selected video source to have the monitor 4 transmit the video signal, and turn off the switch corresponding to the other video source to transmit the video signal to the monitor 4. Since the transmission of
Automatic function switching is possible with just one key operation on the video source or function key operation on the system controller, simplifying operation.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the automatic switching system of the present invention, FIG. 2 is a circuit diagram of another embodiment of the automatic switching system of the present invention, and FIG. 3 is a circuit diagram of another embodiment of the automatic switching system of the present invention. It is a figure which shows the detail of a tact key. 1.2...VTR 1a, 2a, 3a...Control circuit 3...
Video disc 4 --- Switching control section 5 --- Television receivers 6-8 --- Synchronization separation circuits 9-11 --- One-shot trigger generator 12 ---
...Key matrix 13...1, self 9, microcomputer 14...Tact key SWI~SW3...Switch patent applicant Pioneer Corporation

Claims (2)

[Claims] (1) A plurality of video sources that generate video signals by operating a playback key or a function key O, and synchronization separation circuits that extract synchronization signals separated from each other and as many as the video sources. , trigger generation means for outputting a trigger signal when triggered (by the synchronization signal); switches of the same number as the number of video sources for selectively sending video signals output from each of the video sources to the monitor means; a microcomputer configured to input a trigger means outputted from the means and output a control signal for turning on the switch corresponding to a selected one of the video sources and turning off the other switches; Automatic switching system. (2) The microcomputer sends a control signal to control the on/off of the switch, and at the same time sends a signal to start only the selected video source and stop the other video sources. 2. The automatic switching system of claim 1, wherein the automatic switching system is configured to send to a control circuit included within each video source.