KR940023166A - Malfunction prevention circuit of synchronous signal counter - Google Patents
Malfunction prevention circuit of synchronous signal counter Download PDFInfo
- Publication number
- KR940023166A KR940023166A KR1019930003347A KR930003347A KR940023166A KR 940023166 A KR940023166 A KR 940023166A KR 1019930003347 A KR1019930003347 A KR 1019930003347A KR 930003347 A KR930003347 A KR 930003347A KR 940023166 A KR940023166 A KR 940023166A
- Authority
- KR
- South Korea
- Prior art keywords
- synchronization signal
- signal
- sync
- clock
- period
- Prior art date
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Classifications
-
- 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)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
본 발명은 멀치-동기 모니터의 인터페이스에 관한 것으로, 일반적으로 사용되고 있는 동기신호 계수회로는 수평, 수직-동기신호와 클럭신호가 동기화되어 있지 않음으로 수평, 수직-동기 신호의 위상이 조금씩 바뀔경우 최종 출력값이 ±1이 변하게 된다.The present invention relates to an interface of a mulch-sync monitor. In general, a sync signal counting circuit that is generally used is not synchronized with a horizontal and vertical sync signal and a clock signal. The output value changes by ± 1.
그러므로, 동기신호의 주기를 클럭수로 계수한 값을 이용하여 입력되는 모드를 구분하는 회로에서 출력의 미세한 차이로 오동작이 발생하게 되는 문제점이 있게 된다.Therefore, there is a problem that a malfunction occurs due to a minute difference in output in a circuit for classifying input modes using a value obtained by counting the period of the synchronization signal by the number of clocks.
이에 따라서 본 발명의 목적은 상기와 같은 종래의 동기신호 계수회로에 따르는 결함을 해결하기 위하여, 동기신호의 1주기 동안의 클럭수를 계수한 값이 바로 이전 주기동안의 값과 일정값 이상이 차이가 나는지를 체크하여 그 결과에 따라서 모드를 지정하는 출력 데이타를 결정함으로써 동기신호의 위상변이에 따른 오동작을 방지하도록 한 동기신호 계수기의 오동작 방지회로를 제공하는데 있다.Accordingly, an object of the present invention is to solve the above-described defects caused by the conventional synchronization signal counting circuit, and the value of counting the number of clocks in one period of the synchronization signal differs from the value during the previous period by more than a predetermined value. The present invention provides a malfunction prevention circuit of a synchronization signal counter which checks whether the output signal designates a mode according to the result and determines the malfunction according to the phase shift of the synchronization signal.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제1도는 종래의 동기신호 계수 회로도, 제2도는 제1도에서 동기신호의 위상변이에 따른 계수값이 차이를 나타낸 설명도, 제3도는 본 발명의 동기신호 계수기의 오동작 방지회로도이다.1 is a diagram illustrating a conventional synchronization signal counting circuit, and FIG. 2 is an explanatory diagram showing a difference in coefficient values according to a phase shift of a synchronization signal in FIG. 1, and FIG. 3 is a malfunction prevention circuit diagram of the synchronization signal counter of the present invention.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019930003347A KR950015095B1 (en) | 1993-03-05 | 1993-03-05 | Sync pulse width counter circuit for multi-mode monitor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019930003347A KR950015095B1 (en) | 1993-03-05 | 1993-03-05 | Sync pulse width counter circuit for multi-mode monitor |
Publications (2)
Publication Number | Publication Date |
---|---|
KR940023166A true KR940023166A (en) | 1994-10-22 |
KR950015095B1 KR950015095B1 (en) | 1995-12-21 |
Family
ID=19351730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019930003347A KR950015095B1 (en) | 1993-03-05 | 1993-03-05 | Sync pulse width counter circuit for multi-mode monitor |
Country Status (1)
Country | Link |
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KR (1) | KR950015095B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101338542B1 (en) * | 2012-06-26 | 2014-01-03 | 세종대학교산학협력단 | Device and method for reading asynchronous data |
-
1993
- 1993-03-05 KR KR1019930003347A patent/KR950015095B1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101338542B1 (en) * | 2012-06-26 | 2014-01-03 | 세종대학교산학협력단 | Device and method for reading asynchronous data |
Also Published As
Publication number | Publication date |
---|---|
KR950015095B1 (en) | 1995-12-21 |
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