KR940017900A - TV color signal phase detection device - Google Patents

TV color signal phase detection device Download PDF

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Publication number
KR940017900A
KR940017900A KR1019920024721A KR920024721A KR940017900A KR 940017900 A KR940017900 A KR 940017900A KR 1019920024721 A KR1019920024721 A KR 1019920024721A KR 920024721 A KR920024721 A KR 920024721A KR 940017900 A KR940017900 A KR 940017900A
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KR
South Korea
Prior art keywords
signal
output
phase
comparison
vsyn
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KR1019920024721A
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Korean (ko)
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KR960008991B1 (en
Inventor
방준원
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이헌조
주식회사 금성사
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Priority to KR1019920024721A priority Critical patent/KR960008991B1/en
Publication of KR940017900A publication Critical patent/KR940017900A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/455—Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2231/00—Applications
    • H01H2231/036—Radio; TV

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

본 발명은 티브이의 색신호 위상 검출장치에 관한 것으로, 종래에는 복합영상신호가 표준신호인지 비표준신호인지 판별하지 못해 비표준신호인 경우 지터(Jitter)가 포함되면 위상이 일정치 않아 고해상도를 실현하지 못하는 문제점이 있다.The present invention relates to a color signal phase detection device of a TV. Conventionally, when a composite video signal is a standard signal or a non-standard signal and cannot determine whether the composite video signal is a non-standard signal, a jitter is included so that the phase is not constant so that high resolution is not realized. There is this.

이러한 점을 감안하여 본 발명에서는 복합영상신호에서 수직 동기 신호 및 버스트신호를 검출하여 신호 처리하고 이에따라; 위상을 비교하여 표준신호와 비표준신호를 판별하면 이 판별신호에 따라 클럭을 발생시켜 고해상도를 실현할 수 있다.In view of this point, the present invention detects and processes the vertical synchronization signal and the burst signal in the composite video signal and accordingly; By comparing phases and discriminating between standard and non-standard signals, high resolution can be achieved by generating a clock according to this discrimination signal.

Description

티브이의 색신호 위상 검출장치TV color signal phase detection device

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

제1도는 본 발명의 티브이의 색신호 위상 검출 장치의 블럭도, 제2도는 제1도에 있어서, 복합영상신호 분리에 따른 각부의 파형도, 제3도는 제1도에 있어서, 수직동기신호의 위상비교에 따른 각부의 파형도, 제4도는 제1도에 있어서, 버스트 신호의 위상 비교에 따른 각부의 파형도, 제5도는 제1도에 있서, 입력신호 판별에 따른 논리표.1 is a block diagram of a color signal phase detection device of a TV of the present invention, FIG. 2 is a waveform diagram of each part according to the separation of a composite video signal, and FIG. 3 is a phase of a vertical synchronization signal in FIG. Fig. 1 is a waveform diagram of each part according to the comparison, Fig. 4 is a waveform diagram of each part according to the phase comparison of the burst signals, and Fig. 5 is a logic table according to the input signal discrimination.

Claims (3)

복합영상신호(Vi)에서 수직동기신호(Vsyn)을 검출하는 동기신호검출부(1)와, 이 동기신호검출부(1)의 출력(Vsyn)에 따라 펄스(V9)를 발생시키는 펄스발생부(2)와, 이 펄스발생부(2)의 출력(V9)를 에 따라 복합영상신호(Vi)에서 버스트신호(Va)를 검출하는 버스트신호검출부(3)와, 이 버스트신호검출부(3)의 출력(Va)를 클리핑하는 클리퍼(4)와, 이 클리퍼(4)의 출력(Vc)과 상기 동기 신호 검출부(1)의 출력(Vsyn)을 각기 위상제어루프(PLL)시켜 위상 비교하고 전압 제어에 따라 발진신호(V1)(V2)를 각기 출력하는 위상비교발진부(5)(6)와, 이 위상비교 발진부(5)(6)의 출력(V1)(V2)를 각기 N3배, N4배 분주시키는 신호분주기(14C)(14D)와, 이 신호 분주기(14C)의 출력(V8)을 동기신호검출부(1)의 출력(Vsyn)과 위상 비교하고 그 위상차에 따른 직류전압(V3)을 문턱값(TH1)과 비교하는 비교신호출력부(7)와, 상기 신호분주기(14D)의 출력(V9)을 상기 클리퍼(4)의 출력(Vc)과 위상 비교하고 그 위상차에 따른 직류전압(V4)을 문턱값(Th1)과 비교하는 비교신호 출력부(8)와, 상기 비교신호출력부(7)(8)의 출력(V5)(V6)을 논리 조합하는 신호비교부(9)와, 이 신호비교부(9)의 출력(V7)에 따라 상기 위상비교발진부(5)(6)의 출력(V1)(V2)을 선택하여 클럭(CLK)으로 출력시키는 신호스위칭부(10)로 구성한 것을 특징으로 하는 티브이의 색신호 위상검출장치.A sync signal detector 1 for detecting the vertical sync signal Vsyn from the composite video signal Vi, and a pulse generator 2 for generating a pulse V9 in accordance with the output Vsyn of the sync signal detector 1. ), A burst signal detector 3 for detecting the burst signal Va from the composite video signal Vi according to the output V9 of the pulse generator 2, and an output of the burst signal detector 3 The clipper 4 clipping Clip Va and the output Vc of the clipper 4 and the output Vsyn of the synchronous signal detection unit 1 are each phase-controlled loop PLL for phase comparison and voltage control. Therefore, the phase comparison oscillator 5 and 6 outputting the oscillation signals V1 and V2 respectively, and the output V1 and V2 of the phase comparison oscillator 5 and 6 are divided by N3 times and N4 times, respectively. The phase divider 14C and 14D and the output V8 of the signal divider 14C are compared in phase with the output Vsyn of the synchronous signal detection unit 1, and the DC voltage V3 corresponding to the phase difference is compared. Comparison signal output comparing with the threshold value TH1 The phase 7 and the output V9 of the signal divider 14D are compared with the output Vc of the clipper 4, and the DC voltage V4 according to the phase difference is compared with the threshold Th1. A signal comparator 9 for logically combining the comparison signal output section 8, the outputs V5 and V6 of the comparison signal output sections 7 and 8, and the output of the signal comparison section 9 The color signal phase detection of the TV characterized in that it comprises a signal switching unit 10 for selecting the output (V1) (V2) of the phase comparison oscillator (5) (6) according to (V7) and outputs it to the clock CLK. Device. 제1항에 있어서, 비교신호출력부(7)는 동기신호검출부(1)의 출력(Vsyn)과 신호분주기(14C)의 출력(V8)을 위상 비교하는 위상비교기(11C)와, 이 위상비교기(11C)의 출력(V16)을 필터링하여 직류전압인 신호(V17)를 출력하는 루프필터(12C)와, 상기 동기신호검출부(1)의 출력(Vsyn)에 따라 상기 루프필터(12C)의 출력을 수직 동기구간동안 샘플 홀드하는 샘플홀더(15A)와, 이 샘플홀더(15A)의 출력(V3)을 문턱값(Th1)과 비교하는 비교기(16A)로 구성한 것을 특징으로 하는 티브이의 색신호 위상검출장치.The phase comparator 11C according to claim 1, wherein the comparison signal output section 7 includes a phase comparator 11C for phase comparison of the output Vsyn of the synchronization signal detection section 1 with the output V8 of the signal divider 14C. The loop filter 12C for filtering the output V16 of the comparator 11C and outputting the signal V17 which is a DC voltage, and the loop filter 12C according to the output Vsyn of the synchronization signal detection unit 1. The color signal phase of a TV comprising a sample holder 15A for holding an output sample during a vertical synchronization period and a comparator 16A for comparing the output V3 of the sample holder 15A with a threshold Th1. Detection device. 제1항에 있어서, 상기 스위칭부(10)는 신호비교부(9)가 표준신호 판단에 따른 신호(V7)를 출력하면 전압제어발진부(5)의 출력(V1)을 선택하고, 비표준신호판별에 따른 신호(V7)를 출력하면 전압제어발진부(6)의 출력(V2)을 선택하여 클럭(CLK)으로 출력시키는 스위치(SW1)구성한 것을 특징으로 하는 티브이의 색신호 위상 검출장치.The method of claim 1, wherein the switching unit 10 selects the output V1 of the voltage controlled oscillator 5 when the signal comparator 9 outputs the signal V7 according to the standard signal determination, and determines the non-standard signal discrimination. And a switch (SW1) configured to select an output (V2) of the voltage controlled oscillator (6) and output it to the clock (CLK) when the signal (V7) is outputted. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920024721A 1992-12-17 1992-12-17 Color signal phase detecting device of tv KR960008991B1 (en)

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Application Number Priority Date Filing Date Title
KR1019920024721A KR960008991B1 (en) 1992-12-17 1992-12-17 Color signal phase detecting device of tv

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Application Number Priority Date Filing Date Title
KR1019920024721A KR960008991B1 (en) 1992-12-17 1992-12-17 Color signal phase detecting device of tv

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KR940017900A true KR940017900A (en) 1994-07-27
KR960008991B1 KR960008991B1 (en) 1996-07-10

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