KR930020956A - Frequency correction circuit of horizontal synchronization signal - Google Patents

Frequency correction circuit of horizontal synchronization signal Download PDF

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Publication number
KR930020956A
KR930020956A KR1019920004631A KR920004631A KR930020956A KR 930020956 A KR930020956 A KR 930020956A KR 1019920004631 A KR1019920004631 A KR 1019920004631A KR 920004631 A KR920004631 A KR 920004631A KR 930020956 A KR930020956 A KR 930020956A
Authority
KR
South Korea
Prior art keywords
horizontal synchronization
synchronization signal
sync
frequency
signal
Prior art date
Application number
KR1019920004631A
Other languages
Korean (ko)
Other versions
KR950003022B1 (en
Inventor
최창원
Original Assignee
문정환
금성일렉트론 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 문정환, 금성일렉트론 주식회사 filed Critical 문정환
Priority to KR1019920004631A priority Critical patent/KR950003022B1/en
Publication of KR930020956A publication Critical patent/KR930020956A/en
Application granted granted Critical
Publication of KR950003022B1 publication Critical patent/KR950003022B1/en

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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

Abstract

본 발명은 브이씨알의 수평 동기 신호의 주파수 보정에 관한 것으로, 이와 관련하여 일반적으로 사용되고 있는 종래의 회로는 수평 동기 주파수의 변화를 보정하는 시간이 DFG의 주파수에 의존하여 정확도가 떨어지게 되고 회로의 구성상에도 칩의 사이즈가 증가하는 결함을 가지고 있었다. 이에 따라 본 발명은 상기와 같은 종래의 브이씨알 수평 동기 신호의 주파수 보정회로에 따르는 결함을 감안하여, 수평동기신호의 주기 변화를 이용하여 듀티가 변하도록 하여 브이씨알의 수평동기신호의 주파수가 정확히 보정되도록 창안된 것이다.The present invention relates to the frequency correction of the horizontal synchronization signal of VCA, the conventional circuit generally used in this regard, the time for correcting the change of the horizontal synchronization frequency is reduced accuracy depending on the frequency of the DFG and the configuration of the circuit The chip also had a defect of increasing the size of the chip. Accordingly, the present invention, in consideration of the defects caused by the frequency correction circuit of the conventional BT horizontal synchronization signal as described above, allows the duty to be changed using a periodic change of the horizontal synchronization signal so that the frequency of the horizontal synchronization signal of the VRC is accurately It was designed to be calibrated.

Description

수평동기 신호의 주파수 보정회로Frequency correction circuit of horizontal synchronization signal

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

제2도는 본 발명 수평동기신호의 주파수 보정회로에 대한 블록 구성도.2 is a block diagram of a frequency correction circuit of the present invention.

제3도는 제2도의 상세 회로도.3 is a detailed circuit diagram of FIG.

Claims (1)

일정 클럭신호(CK)에 동기되어 수평동기신호(H-SYNC)의 시작점에서 부터 주기의 경과된 시간을 계수하는 카운터(110)와, 수평동기신호(H-SYNC)가 입력되면 상기 카운터(110)를 초기화시키고 수평동기 신호(H-SYNC)의 주기의 일정 구간에서 상기 카운터(110)가 계수한 값을 입력하여 그 구간내에서 수평동기신호(H-SYNC)의 노이즈를 제거하는 노이즈 상쇄부(100)와, 상기 카운터(11)가 계수한 값을 입력하여 수평동기신호(H-SYNC)의 주기가 일정치만큼 경과한 것을 판단하고 브이씨알의 배속 재생시 수평동기 신호(H-SYNC)의 주파수에 따라 테이프와 헤드와의 상대속도를 조절하는 제어신호를 발생하는 래치부(120)와, 상기 래치부(120)의 출력전압에서 저주파 신호를 추출하여 출력하는 로우패스 필터(130)로 된 것을 특징으로 하는 수평동기신호의 주파수 보정회로.A counter 110 that counts the elapsed time of the period from the start of the horizontal synchronization signal H-SYNC in synchronization with a predetermined clock signal CK, and the counter 110 when the horizontal synchronization signal H-SYNC is input. ) Is initialized and a noise canceling unit for inputting a value counted by the counter 110 in a period of the period of the horizontal synchronization signal H-SYNC to remove noise of the horizontal synchronization signal H-SYNC within the interval. And a value counted by the counter 11 to determine that the period of the horizontal synchronizing signal H-SYNC has elapsed by a predetermined value, and the horizontal synchronizing signal H-SYNC during double speed reproduction of V-Cal. With the latch unit 120 for generating a control signal for adjusting the relative speed between the tape and the head according to the frequency of the low-pass filter, and the low-pass filter 130 for extracting and outputting a low frequency signal from the output voltage of the latch unit 120 And a frequency correction circuit of the horizontal synchronization signal. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920004631A 1992-03-20 1992-03-20 Apparatus for compensating frequency for horizontal synchronizing signal KR950003022B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920004631A KR950003022B1 (en) 1992-03-20 1992-03-20 Apparatus for compensating frequency for horizontal synchronizing signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920004631A KR950003022B1 (en) 1992-03-20 1992-03-20 Apparatus for compensating frequency for horizontal synchronizing signal

Publications (2)

Publication Number Publication Date
KR930020956A true KR930020956A (en) 1993-10-20
KR950003022B1 KR950003022B1 (en) 1995-03-29

Family

ID=19330666

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019920004631A KR950003022B1 (en) 1992-03-20 1992-03-20 Apparatus for compensating frequency for horizontal synchronizing signal

Country Status (1)

Country Link
KR (1) KR950003022B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100683103B1 (en) * 2004-08-04 2007-02-15 산요덴키가부시키가이샤 Oscillating ferquency correction circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100683103B1 (en) * 2004-08-04 2007-02-15 산요덴키가부시키가이샤 Oscillating ferquency correction circuit

Also Published As

Publication number Publication date
KR950003022B1 (en) 1995-03-29

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