KR970031313A - Synchronization detection circuit - Google Patents
Synchronization detection circuit Download PDFInfo
- Publication number
- KR970031313A KR970031313A KR1019950039892A KR19950039892A KR970031313A KR 970031313 A KR970031313 A KR 970031313A KR 1019950039892 A KR1019950039892 A KR 1019950039892A KR 19950039892 A KR19950039892 A KR 19950039892A KR 970031313 A KR970031313 A KR 970031313A
- Authority
- KR
- South Korea
- Prior art keywords
- unit
- synchronization detection
- synchronization
- detection circuit
- preset
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/06—Generation of synchronising signals
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/20—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits characterised by logic function, e.g. AND, OR, NOR, NOT circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K21/00—Details of pulse counters or frequency dividers
- H03K21/38—Starting, stopping or resetting the counter
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Synchronizing For Television (AREA)
Abstract
본 발명은 동기 검출 회로의 검출 레벨을 프로그램으로 조절할 수 있는 동기 검출 회로에 관한 것으로, 동기 검출의 영역을 조절하는 하이 및 로우 프리세트 데이타를 입력으로 상기 수평 동기 신호를 다운 카운트하는 다운 카운트부, 상기 다운 카운트부로 부터 출력되는 값들이 '0'이 되면 하이 레벨의 신호들을 출력하는 게이트부, 상기 수직 동기 신호를 입력으로 1프레임마다 상기 다운 카운트부를 리세트시키는 리세트부, 및 상기 리세트부의 출력에 따라 상기 게이트부의 출력들을 래치하는 래치로 구성된다.The present invention relates to a synchronization detection circuit capable of programmatically adjusting the detection level of a synchronization detection circuit, comprising: a down count unit for down counting the horizontal synchronization signal by inputting high and low preset data for adjusting an area of the synchronization detection; A gate unit for outputting high level signals when the values output from the down count unit are '0', a reset unit for resetting the down count unit every frame by inputting the vertical synchronization signal, and the reset unit A latch is configured to latch the outputs of the gate part according to the output.
따라서 본 발명은 동기 검출의 영역 조절이 가능하게 되어 동기의 유무를 판별하는 기준 레벨의 변화가 용이한 효과가 있다.Therefore, the present invention can adjust the area of the synchronization detection, and there is an effect that the reference level for discriminating the presence or absence of synchronization can be easily changed.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제1도는 종래의 동기 검출 회로의 회로도.1 is a circuit diagram of a conventional synchronous detection circuit.
제2도는 본 발명에 따른 동기 검출회로의 회로도.2 is a circuit diagram of a synchronization detection circuit according to the present invention.
제3도는 제2도의 각 부분의 신호 파형도.3 is a signal waveform diagram of each part of FIG.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950039892A KR0175270B1 (en) | 1995-11-06 | 1995-11-06 | Synchronization detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950039892A KR0175270B1 (en) | 1995-11-06 | 1995-11-06 | Synchronization detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
KR970031313A true KR970031313A (en) | 1997-06-26 |
KR0175270B1 KR0175270B1 (en) | 1999-03-20 |
Family
ID=19433062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019950039892A KR0175270B1 (en) | 1995-11-06 | 1995-11-06 | Synchronization detection circuit |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR0175270B1 (en) |
-
1995
- 1995-11-06 KR KR1019950039892A patent/KR0175270B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR0175270B1 (en) | 1999-03-20 |
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