JPH0472964A - Automatic changeover device - Google Patents

Abstract

PURPOSE:To supply an external synchronizing signal and a power supply to cameras of a least number by allowing the automatic changeover device to store a switching time of each camera and controlling the application and interruption of the external synchronizing signal and the power supply after lapse of an optional time with respect to the switching time. CONSTITUTION:A video signal switching circuit 2 selects sequentially a camera video signal from a camera 1a at a time preset by a controller 4 and outputs it to a monitor 6. Moreover, an external synchronizing signal and power supply changeover circuit 3 applies an external synchronizing signal generated from a synchronizing signal generating circuit 8 and a power supply generated from a power supply circuit 7 to a camera selected by the controller 4. Then the controller 4 uses a switching latch storage device 9 to control so that the external synchronizing signal and power supply changeover circuit 3 is connected to the camera 1a selected by the video signal changeover circuit 2 at present and to a camera 1b selected by the video signal changeover circuit 2 before processing time and releases the connection to a camera 1n having been selected precedingly sequentially and repetitively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power source and external synchronization signal supply device for an automatic switching device in a surveillance camera system.

[Conventional technology]

As described in Japanese Unexamined Patent Publication No. 1-54878, conventional surveillance camera systems measure the time at which an arbitrarily selected television camera is turned on, and determine whether the power is turned off within a predetermined time. If the problem was not released, the power was turned off.

[Problem to be solved by the invention]

The above-mentioned conventional technology only switches the power supply without considering external synchronization signals, and has the problem that external synchronization signals must be given to all cameras.

An object of the present invention is to provide an automatic switching device that supplies an external synchronization signal and power to a minimum number of cameras without complicating the configuration.

[Means to solve the problem]

In order to achieve the above object, the present invention allows an automatic switching device to memorize the switching time of each camera, and controls external synchronization signals and power on/off when an arbitrary time elapses with respect to the switching time. It was designed to do so.

[Effect]

The automatic switching device controls the external synchronization signal supplied to the camera and the turning on and release of power, but since the external synchronization signal and power are already supplied to the camera that the automatic switching device selects next, The images on the monitor can be switched without any disturbance.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In the automatic switching device 5, the video signal switching circuit 2 sequentially switches the camera video signals starting from 1a at a time preset by the controller 4 and outputs them to the monitor 6. or,
An external synchronization signal and power supply switching circuit 3 supplies an external synchronization signal generated by a synchronization signal generation circuit 8 and a power supply generated by a power supply circuit 7 to the camera selected by the controller I-roller 4. Here, the controller 1-roller 4 connects the external synchronization signal and power supply switching circuit 3 to the camera 1a currently selected by the video signal switching circuit 2 by the switching storage storage device 9, and then connects the video signal Control is performed to sequentially repeat the operation of connecting the camera 1b selected by the switching circuit 2 for a certain period of time and simultaneously disconnecting the camera 1n selected before that. 1. According to this embodiment, it is possible to smoothly switch between multiple cameras, and there is no need to supply external synchronization and power to all cameras, resulting in a large +1J reduction in power consumption.
Also, there is an effect that the loss can be reduced by 1~down.

〔Effect of the invention〕

According to the present invention, since it is not necessary to provide external synchronization signals and power to all cameras, it is possible to significantly reduce power consumption and loss.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. 1. Camera, 2. Video signal switching circuit, 3. External synchronization signal and power supply switching circuit, 4. Controller 1-roller, 5. Automatic switching device, 6. TV monitor, 7. Power supply circuit. , 8... Synchronization signal generation circuit, 9... Switching holding storage device.

Claims (1)

[Scope of Claims] 1. A power superimposing camera, an automatic video signal switching device comprising an external synchronization signal generation circuit, a power superimposing circuit, and a switching holding storage device for supplying the power superimposing camera, and the automatic switching. In a surveillance camera system consisting of a TV monitor that displays a video output signal from a device, among the plurality of cameras connected to the automatic switching device, driving the camera connected to the TV monitor, and then driving the camera connected to the TV monitor. An automatic switching device that is characterized by starting the camera connected to the monitor a certain period of time before the camera is connected.