KR940001667A - Image signal presence and absence device - Google Patents

Image signal presence and absence device Download PDF

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Publication number
KR940001667A
KR940001667A KR1019920011151A KR920011151A KR940001667A KR 940001667 A KR940001667 A KR 940001667A KR 1019920011151 A KR1019920011151 A KR 1019920011151A KR 920011151 A KR920011151 A KR 920011151A KR 940001667 A KR940001667 A KR 940001667A
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KR
South Korea
Prior art keywords
signal
input
toggle
synchronization
synchronization signal
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Application number
KR1019920011151A
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Korean (ko)
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KR0160612B1 (en
Inventor
백승웅
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정용문
삼성전자주식회사
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Priority to KR1019920011151A priority Critical patent/KR0160612B1/en
Publication of KR940001667A publication Critical patent/KR940001667A/en
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Publication of KR0160612B1 publication Critical patent/KR0160612B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronizing For Television (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

본 발명은 영상신호의 입력 유무를 판별하는, 특히 내부의 동기신호발생기를 구비하여 입력되는 외부의 동기신호에 영향을 받지않고 안정적으로 신호의 입력유무를 판별할 수 있도록하는 신호입력 유무 판별장치에 관한 것으로서 외부영상 입력신호로부터 제1동기신호를 분리하기 위한 동기신호분리수단(10); 분리된 동기신호의 입력에 따라 논리상태를 변화시키기위한 토글수단; 내부의 제2동기신호를 발생시키기 위한 동기발생수단; 상기 토글수단에서의 출력이 입력될때마다 상기 동기발생수단에서 출력되는 제2동기신호를 일정값만큼 시프트시키기위한 시프팅수단; 영상신호의 입력유무 판단신호를 출력하기 위하여 상기 시프팅수단으로부터 시프트된 출력을 입력신호로 받아서 일정값동안 상태가 반복되는 가를 체크하는 토글체크수단; 및 상기 토글체크수단으로 부터의 소스유무판단 신호에 따라 상기 동기발생수단으로 부터의 제2동기신호를 출력하는 모드출력수단을 포함하는 것을 특징으로 한다.The present invention provides a signal input determination device for determining whether an image signal is input or not, and in particular, having an internal synchronization signal generator to stably determine whether or not a signal is input without being influenced by an external synchronization signal. A synchronization signal separating means (10) for separating a first synchronization signal from an external image input signal; Toggle means for changing the logic state in response to the input of the separated synchronization signal; Synchronization generating means for generating an internal second synchronization signal; Shifting means for shifting the second synchronous signal output from the synchronization generating means by a predetermined value each time an output from the toggle means is input; Toggle checking means for checking whether the state is repeated for a predetermined value by receiving the output shifted from the shifting means as an input signal so as to output a video signal input determination signal; And mode output means for outputting a second synchronous signal from the synchronization generating means in accordance with the source presence determination signal from the toggle checking means.

Description

영상신호 유무판별 장치Video signal presence and absence device

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

제1도는 본 발명에 따른 영상신호 유무판별장치의 블록도.1 is a block diagram of a video signal discrimination apparatus according to the present invention.

제2도는 영상신호가 입력된 경우의 파형도.2 is a waveform diagram when a video signal is input.

제3도는 영상신호가 입력되지 않은 경우의 파형도.3 is a waveform diagram when no video signal is input.

Claims (2)

외부영상 입력신호로부터 제1동기신호를 분리하기 위한 동기신호분리수단; 상기 제1동기신호의 입력에 따라 논리상태를 변화시키기위한 토글수단; 제2동기신호를 발생시키기 위한 동기신호발생수단; 상기 토글수단에서의 출력이 입력될때마다 상기 동기신호 발생수단에서 출력되는 제2동기신호의 주파수의 일정 정수배만큼 상기 토글수단의 출력신호를 각각 시프팅하는 시프팅수단; 영상신호의 입력유무를 판단하기 위하여 상기 시프팅수단으로부터 각각 시프팅된 출력을 입력신호로 받아서 논리상태가 일정회수 반복되는 가를 체크하는 토글체크수단; 및 상기 토글체크수단으로 부터의 입력신호의 유무판단 신호에 따라 상기 동기신호발생수단으로 부터의 제2동기신호로 래치하여 판단신호를 출력하는 모드출력수단을 포함하는 것을 특징으로 하는 동기신호 유무판별장치.Synchronization signal separation means for separating the first synchronization signal from the external image input signal; Toggle means for changing a logic state in response to the input of said first synchronization signal; Synchronizing signal generating means for generating a second synchronizing signal; Shifting means for shifting the output signal of the toggle means each time by an integer multiple of the frequency of the second synchronization signal output from the synchronization signal generation means each time the output from the toggle means is input; Toggle checking means for checking whether the logic state is repeated a predetermined number of times by receiving the shifted outputs from the shifting means as input signals to determine whether an image signal is input; And a mode output means for latching the second synchronization signal from the synchronization signal generating means and outputting a determination signal according to the presence / absence determination signal of the input signal from the toggle checking means. Device. 제1항에 있어서, 상기 토글체크수단에서 논리상태의 반복회수가 3 내지 5회인 것을 특징으로 하는 동기신호 유무판별장치.2. The apparatus as claimed in claim 1, wherein the toggle checking means has a repetition frequency of 3 to 5 times in a logic state. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920011151A 1992-06-25 1992-06-25 Apparatus for discriminating image signals KR0160612B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920011151A KR0160612B1 (en) 1992-06-25 1992-06-25 Apparatus for discriminating image signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920011151A KR0160612B1 (en) 1992-06-25 1992-06-25 Apparatus for discriminating image signals

Publications (2)

Publication Number Publication Date
KR940001667A true KR940001667A (en) 1994-01-11
KR0160612B1 KR0160612B1 (en) 1999-01-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019920011151A KR0160612B1 (en) 1992-06-25 1992-06-25 Apparatus for discriminating image signals

Country Status (1)

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KR (1) KR0160612B1 (en)

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Publication number Publication date
KR0160612B1 (en) 1999-01-15

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