KR950004734A

KR950004734A - Switching circuit

Info

Publication number: KR950004734A
Application number: KR1019930014459A
Authority: KR
Inventors: 최정수
Original assignee: 이대원; 삼성항공산업 주식회사
Priority date: 1993-07-28
Filing date: 1993-07-28
Publication date: 1995-02-18

Abstract

본 발명은 스위칭 회로에 관한 것으로, 자동모드에서 스위칭 간격을 외부에서 조절하도록 하기 위하여 클럭발생수단과, 클럭발생수단으로부터 발생되는 클럭의 주기를 외부로부터 조절하도록 하는 주파수조절수단과, 상기 클럭발생수단에서 발생된 클럭을 계수하는 카운터를 구비하며, 상기 카운터의 출력형태에 따라 자동모드에서 스위칭이 제어되도록 한다.The present invention relates to a switching circuit, the clock generating means for adjusting the switching interval in the automatic mode from the outside, the frequency adjusting means for adjusting the period of the clock generated from the clock generating means from the outside, and the clock generating means A counter is provided for counting a clock generated by the controller, and switching is controlled in an automatic mode according to the output form of the counter.

한편, 수동모드시에 불필요한 전력소모를 줄이기 위하여 스위칭 회로는 수동모드에서 복수의 카메라로부터 입력되는 영상신호들을 각각 입력하는 입력포트들중 사용자에 의하여 선택된 입력포트를 나타내는 포트선택수단과, 선택된 입력포트로부터 공급되는 영상신호를 정하여 모니터에 연결되는 출력포트로 전송하는 영상신호 조정부와, 상기 포트선택수단의 출력이 어떠한 입력포트도 선택되지 않았음을 나타낼 때 상기 영상신호 조정부의 각 전원단자들로 동일한 레벨의 신호를 공급함으로써 전원을 차단하는 전원 제어부를 구비한다.On the other hand, in order to reduce unnecessary power consumption in the manual mode, the switching circuit includes port selection means indicating an input port selected by the user among input ports for inputting image signals input from a plurality of cameras in the manual mode, and the selected input port. The video signal adjusting unit which selects the video signal supplied from the video signal and transmits it to the output port connected to the monitor, and when the output of the port selecting means indicates that no input port is selected, the power supply terminals of the video signal adjusting unit are the same. It is provided with a power supply control part which cuts off a power supply by supplying the signal of a level.

Description

Switching circuit

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제 1 도는 본 발명에 따른 스위칭회로의 블럭도, 제 2도는 제 1도에 도시된 클럭발생수단의 상세 블럭도.1 is a block diagram of a switching circuit according to the present invention, and FIG. 2 is a detailed block diagram of the clock generating means shown in FIG.

Claims

An apparatus which operates in an automatic mode and a manual mode, selects and outputs one of a plurality of input signals, comprising: clock generating means; Frequency adjusting means for adjusting a period of the clock generated from the clock generating means from the outside; And a counter for counting a clock generated by the strong clock generating means, wherein switching is controlled in an automatic mode according to the output form of the counter.

CLAIMS 1. A closed circuit television (CCTV) system operating in an automatic mode and a manual mode and including a switching circuit for selecting and outputting one of video signals input from a plurality of cameras, comprising: a clock generating means; Frequency adjusting means for adjusting a period of the clock generated from the clock generating means from the outside; And a counter for counting a clock generated by the clock generating means, wherein switching is controlled in an automatic mode according to the output form of the counter.

3. The switching circuit according to claim 2, wherein the frequency adjusting means adjusts a period of a clock generated by adjusting a resistance value included in the clock generating means.

The switching method according to claim 2, wherein the counter indicates N outputs that are sequentially enabled each time a clock is applied when the number of input ports for inputting image signals obtained from a plurality of cameras is N. Circuit.

In a closed circuit television (CCTV) system operating in an automatic mode and a manual mode and including a switching circuit for selecting and outputting one of image signals input from a plurality of cameras, the image input from a plurality of cameras in a manual mode. Port selection means for indicating an input port selected by a user among input input ports for inputting signals respectively; An image signal adjusting unit for controlling an image signal supplied from the selected input port and transmitting the image signal to an output port connected to the monitor; And a power supply control unit which cuts off the power by supplying a signal of the same level to each of the power supply terminals of the image signal adjusting unit when the output of the port selecting unit indicates that no input port is selected. .

※ Note: The disclosure is based on the initial application.