KR970019439A

KR970019439A - Automatic Input Selection Circuit of Audio / Video Type TV Receiver

Info

Publication number: KR970019439A
Application number: KR1019950033351A
Authority: KR
Inventors: 박현수
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1995-09-30
Filing date: 1995-09-30
Publication date: 1997-04-30

Abstract

본 발명은 안테나로부터 수신된 방송신호의 채널을 선국하여 RF 신호를 출력하는 튜너와, n개의 감시용카메라에서 공급되는 영상신호를 각각 필드단위로 비교하여 변화가 있는지 여부를 검출하는 변화검출부와, AV 입력단자에 AV 기기로부터의 AV 신호가 인가되는 경우에는 사용자의 입력선택에 따른 제1절환신호를 출력하고, AV 입력단자에 감시용 카메라로부터의 영상신호가 인가되는 경우에는 변화검출부에서의 검출결과, 변화가 있는 감시용 카메라로부터 공급되는 영상신호를 절환하기 위한 제2절환신호를 출력하기 위한 마이콤과, 마이콤에서 출력되는 제1절환신호에 따라 RF신호 또는 AV신호를 절환하고, 제2절환신호에 따라 변화가 있는 감시용 카메라로부터 공급되는 영상신호를 절환하여 TV신호처리부로 공급하는 스위칭 IC로 구성된다. 영상신호를 필드 단위로 비교하고, 변화가 있는 감시용 카메라의 영상신호를 선택하여 화면상에 출력함으로써 감시자가 감시대상을 용이하게 관찰할 수 있다.According to the present invention, there is provided a tuner which tunes a channel of a broadcast signal received from an antenna and outputs an RF signal, a change detector which detects whether or not there is a change by comparing image signals supplied from n surveillance cameras in field units, respectively; When the AV signal from the AV device is applied to the AV input terminal, the first switching signal is output according to the user's input selection, and when the video signal from the monitoring camera is applied to the AV input terminal, the change detection unit detects the change signal. As a result, the microcomputer for outputting the second switching signal for switching the video signal supplied from the surveillance camera with the change, the RF signal or AV signal is switched in accordance with the first switching signal output from the microcomputer, and the second switching It is composed of a switching IC for switching the video signal supplied from the monitoring camera with a change in accordance with the signal to supply to the TV signal processing unit. By comparing the video signals in field units and selecting and outputting the video signals of the surveillance cameras with change, the monitors can easily observe the monitoring targets.

Description

Automatic Input Selection Circuit of Audio / Video Type TV Receiver

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

제2도는 AV형 TV수신기에 있어서 본 발명에 의한 자동입력 선택회로를 나타낸 블럭도이다.2 is a block diagram showing an automatic input selection circuit according to the present invention in an AV TV receiver.

Claims

In an AV TV receiver having an AV input terminal for applying an AV signal supplied from an AV device or n video signals supplied from n surveillance cameras, an RF signal is selected by selecting a channel of a broadcast signal received from an antenna. A tuner for outputting; A change detector for detecting whether there is a change by comparing the image signals supplied from the n surveillance cameras in field units; When a signal from the AV device is applied to the AV input terminal, a first switching signal is output according to a user's input selection, and when the video signal from the surveillance camera is applied to the AV input terminal, A microcomputer for outputting a second switching signal for switching the video signal supplied from the monitoring camera with the change as a result of detection by the change detection unit; And switching the RF signal or the AV signal according to the first switching signal output from the microcomputer, and switching the video signal supplied from the monitoring camera with the change according to the second switching signal to supply to the TV signal processor. An automatic input selection circuit comprising an IC for an AV television receiver.

2. The apparatus of claim 1, wherein the change detection unit comprises: a field memory for storing one field of a video signal from a surveillance camera entered through the AV input terminal; And a comparator for comparing the video signal of the previous field and the video signal of the current field stored in the field memory to detect a change.

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