KR0158410B1 - System for separating sync-signals - Google Patents

System for separating sync-signals Download PDF

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Publication number
KR0158410B1
KR0158410B1 KR1019950038624A KR19950038624A KR0158410B1 KR 0158410 B1 KR0158410 B1 KR 0158410B1 KR 1019950038624 A KR1019950038624 A KR 1019950038624A KR 19950038624 A KR19950038624 A KR 19950038624A KR 0158410 B1 KR0158410 B1 KR 0158410B1
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color
square wave
signal
color carrier
input
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KR1019950038624A
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Korean (ko)
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KR970024901A (en
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이철호
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배순훈
대우전자주식회사
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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
    • 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
    • H04N9/45—Generation or recovery of colour sub-carriers
    • 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
    • H04N9/70—Circuits for processing colour signals for colour killing

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

Abstract

본 발명은 복합영상신호로부터 동기신호를 분리하고, 색부반송파를 복원하여 구형파로 정형화하는 동기신호 분리시스템에 관한 것으로, 본 발명은 분리한 동기신호로 색부반송파를 복원한 후 구형파로 정형화함으로써, 상기 색부반송파의 위상비교가 용이해지고 정확한 비교가 이루어지는 효과가 있다.The present invention relates to a synchronization signal separation system for separating a synchronization signal from a composite video signal and restoring a color carrier to form a square wave. The phase comparison of the color carriers becomes easy and there is an effect of making an accurate comparison.

Description

동기신호 분리시스템Synchronous Signal Separation System

제1도는 본 발명에 의한 동기신호 분리시스템의 구성을 보여주는 블럭도.1 is a block diagram showing the configuration of a synchronization signal separation system according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 입력버퍼부 11 : 대역소거필터10: input buffer unit 11: band erasure filter

12 : 동기신호분리부 13 : 제1색부반송파복원부12: synchronization signal separator 13: first color carrier carrier recovery unit

14 : 제1구형파발생부 15 : 제2색부반송파복원부14: first square wave generator 15: second color carrier carrier recovery unit

16 : 제2구형파발생부 17 : 모드선택부16: second square wave generator 17: mode selection unit

본 발명은 입력되는 복합영상신호로부터 동기신호및 색부반송파를 분리하고 상기 색부반송파를 구형파로 정형화하는 동기신호 분리시스템에 관한것이다.The present invention relates to a synchronization signal separation system for separating a synchronization signal and a color carrier from an input composite video signal and shaping the color carrier with a square wave.

일반적으로, 복합영상신호는 영상신호와 동기신호를 합성한 신호를 말하며, 상기 동기신호는 영상신호를 수상측에서 분해한 주사선과 일치하도록 동기를 부여하는 것으로, 수직주사의 동기를 맞추기위한 수직동기신호와, 수평주사의 동기를 맞추기 위한 수평동기신호와, 수상기에서 만들어질 색부반송파의 위상과 주파수를 맞추기 위한 기준신호인 색버스트신호가 포함된다.In general, a composite video signal refers to a signal obtained by synthesizing a video signal and a synchronization signal, and the synchronization signal is used to synchronize the video signal with a scanning line decomposed at the receiving side, and to synchronize the vertical scan. Signal, a horizontal synchronization signal for synchronizing the horizontal scanning, and a color burst signal, which is a reference signal for adjusting the phase and frequency of the color carrier which is produced by the receiver.

그리고 상기 색부반송파는 전송대역이 한정되어 있으므로, 영상대역내에서 설정하고, 상기 색부반송파에 의한 휘도신호와의 간섭을 피하기 위하여 색부반송파 억압진폭변조방식으로 변조한다. 그러므로, 복합영상신호에는 색부반송파가 실리지 않으므로, 상기 색부반송파는 수상기측에서발생하여, 색신호를 복조하게 된다. 이와같이 색신호를 전송하기위한 색부반송파는 방송방식에 따라서 달라지는데, NTSC 방식에서는 약 3.58MHz의 색부반송파를 사용하고, PAL방식등에서는 약 4.43MHz의 색부반송파를 사용한다.Since the color carrier has a limited transmission band, the color carrier is set within the video band and modulated by the color carrier suppression amplitude modulation scheme to avoid interference with the luminance signal caused by the color carrier. Therefore, since the color carrier is not loaded on the composite video signal, the color carrier is generated on the receiver side and demodulates the color signal. As described above, the color subcarriers for transmitting color signals vary depending on the broadcasting method. The NTSC method uses a color subcarrier of about 3.58 MHz, and the PAL method uses a color subcarrier of about 4.43 MHz.

그런데, 영상신호를 분석할 때, 유저가 원하는 특정 프레임, 필드, 라인을 설정하여 동작시키기 위해서는 입력되는 영상신호의 위상과 동기신호발생장치로부터 출력되는 동기의 위상을 비교하여야 한다.However, when analyzing a video signal, in order to set and operate a specific frame, field, or line desired by a user, it is necessary to compare the phase of the input video signal with the phase of the sync output from the sync signal generator.

본 발명은 상기와 같이 정확한 위상비교가 가능하도록 하는 장치로써, 그 목적은 복합영상신호로부터 동기신호를 분리하고, 복원된 색부반송파를 구형파로 정형화하는 동기신호분리시스템을 제공함에 있다.The present invention is an apparatus for enabling accurate phase comparison as described above, and an object thereof is to provide a synchronization signal separation system for separating a synchronization signal from a composite video signal and shaping the restored color carrier by a square wave.

상기와 같은 목적을 달성하기 위한 기술적인 수단으로써, 본 발명은 동기신호분리 시스템에 있어서, 외부에서 입력되는 복합영상신호의 왜곡을 막기위하여 입력단에 구비되는 입력버퍼부와, 상기 입력버퍼부로부터 입력되는 복합영상신호에서 색신호를 제거하는 대역소거필터와, 상기 대역소거필터로부터 입력되는 색신호가 제거된 복합영상신호로부터 동기신호를 분리하여 출력하는 동기신호분리부와, 상기 입력버퍼부로부터 출력되는 복합영상신호와 상기 동기신호분리부로부터 출력되는 버어스트신호를 입력받아 3.58MHz의 색부반송파를 발생하는 제1색부반송파복원부와, 상기 입력버퍼부로부터 출력되는 복합영상신호와 상기 동기신호분리부로부터 출력되는 버어스트신호를 입력받아 4.43MHz의 색부반송파를 발생하는 제2색부반송파복원부와, 상기 제1색부반송파복원부로부터 출력되는 3.58MHz 색부반송파를 구형파로 정형화하는 제1구형파발생부와, 상기 제2색부반송파복원부로부터 출력되는 4.43MHz의 색부반송파를 구형파로 정형화하는 구형파 발생부와, 상기 제1구형파발생부와 제2구형파발생부로부터 출력되는 정형화된 색부반송파를 선택출력하는 모드선택부를 구비함을 특징으로 한다.As a technical means for achieving the above object, the present invention provides an input buffer unit provided in the input terminal to prevent distortion of the composite video signal input from the outside, and input from the input buffer unit in the synchronization signal separation system A band cancellation filter for removing color signals from the composite video signal, a sync signal separating unit for separating and outputting a sync signal from the composite video signal from which the color signal input from the band erasing filter is removed, and a composite output from the input buffer unit A first color carrier restorer for receiving a video signal and a burst signal output from the sync signal separator and generating a 3.58 MHz color carrier, a composite video signal output from the input buffer and the sync signal separator A second color carrier recovery unit for receiving the output burst signal and generating a 4.43 MHz color carrier; A first square wave generator for shaping the 3.58 MHz color carriers output from the first color carrier restorer into a square wave, and a square wave generator for shaping the 4.43 MHz color carriers output from the second color carrier restorer into a square wave; And a mode selector configured to selectively output the shaped color carriers output from the first square wave generator and the second square wave generator.

이하 첨부한 도면을 참조하여 설명한다.It will be described below with reference to the accompanying drawings.

제1도는 본 발명에의한 동기신호 분리시스템의 구성을 보여주는 블럭도로써, 영상신호입력단의 왜곡현상을 막고, 정합을 위한 입력버퍼부(10)와, 상기 입력버퍼부(10)로부터 입력되는 복합영상신호(Vin)로부터 색차신호를 제거하는 대역소거필터(11)와, 상기 대역소거필터(11)로부터 출력되는 색차신호가 제거된 복합영상신호(Vin)에서 동기신호를 분리하여 수직동기신호, 필드신호, 버어스트신호, 복합동기신호를 출력하는 동기신호분리부(12)와, 상기 입력버퍼부(10)로부터 출력되는 복합영상신호(Vin)와, 상기 동기신호분리부(12)로부터 출력되는 분리된 버어스트신호를 입력받아 3.58MHz의 색부반송파를 발생하는 제1색부반송파복원부(13)와, 상기 제1색부반송파복원부(13)로부터 이력되는 정현파를 구형파로 정형화하는 제1구형파발생부(14)와, 상기 입력버퍼부(10)로부터 출력되는 복합영상신호(Vin)와 상기 동기신호 분리부(12)로부터 출력되는 분리된 버어스트 신호를 입력받아 4.43MHz의 색부반송파를 발생하는 제2색부반송파복원부(15)와, 상기 제2색부반송파복원부(15)로부터 입력되는 정현파를 정형하여 구형파를 출력하는 제2구형파발생부(16)와, 상기 제1구형파발생부(14)와 제2구형파발생부(16)로부터 출력되는 두 방송방식의 정형화된 색부반송파를 선택출력하는 모드선택부(17)를 구비한다.1 is a block diagram showing a configuration of a synchronization signal separation system according to the present invention, which prevents distortion of an image signal input terminal and is input from the input buffer unit 10 and the input buffer unit 10 for matching. A vertical synchronization signal by separating the synchronization signal from the band cancellation filter 11 for removing the color difference signal from the composite video signal Vin and the composite video signal Vin from which the color difference signal output from the band cancellation filter 11 is removed. And a synchronization signal separation unit 12 for outputting a field signal, a burst signal, and a composite synchronization signal, a composite video signal Vin output from the input buffer unit 10, and the synchronization signal separation unit 12. A first color carrier carrier restoring unit 13 generating a 3.58 MHz color carrier by receiving the output separated burst signal, and a first wave shaping the sine wave hysteresis from the first color carrier carrier restoring unit 13 into a square wave. Square wave generator 14 and the input buffer A second color carrier recovery unit 15 for receiving a composite video signal Vin outputted from (10) and a separate burst signal outputted from the synchronization signal separator 12 and generating a 4.43 MHz color carrier; A second square wave generator 16 for shaping a sine wave input from the second color carrier carrier restorer 15 to output a square wave; and the first square wave generator 14 and the second square wave generator 16 And a mode selector 17 for selectively outputting the two color broadcast carriers.

본 발명의 작용 및 효과를 상세하게 설명한다.The operation and effects of the present invention will be described in detail.

제1도에서, 복합영상신호(Vin)는 입력버퍼부(10)로 입력된다. 상기 입력버퍼부는 영상신호입력단의 왜곡현상을 막기위한 것으로써, 상기 입력버퍼부(10)를 통과한 복합영상신호(Vin)는 대역소거필터(11)와 제1색부반송파복원부(13) 및 제2색부반송파복원부(15)로 입력된다. 복합영상신호가 그대로 동기신호분리부(12)로 입력되면 클리핑시 오동작을 유발시키므로, 상기 복합영상신호에서 색신호를 제거해야 한다.In FIG. 1, the composite video signal Vin is input to the input buffer unit 10. The input buffer unit is to prevent distortion of the image signal input terminal, and the composite image signal Vin passing through the input buffer unit 10 includes a band cancellation filter 11, a first color carrier carrier restoration unit 13, and Input to the second color carrier recovery unit 15. If the composite video signal is input to the sync signal separator 12 as it is, it causes a malfunction during clipping, and thus the color signal should be removed from the composite video signal.

상기 대역소거필터(11)는 입력버퍼부(10)로부터 입력되는 복합영상신호에서 색신호 대역을 저지하여, 색신호가 제거된 복합영상신호를 출력한다. 상기 색신호가 제거된 복합영상신호는 동기신호분리부(12)로 입력되어, 영상신호로부터 동기신호가 분리된다. 즉, 영상신호가 분리된 혼합동기신호와, 필드와 필드를 구분하기위한 수직동기신호와, 짝수필드와 홀수필드를 구분하는 필드신호, 버어스트신호가 동기신호 분리부(12)로부터 출력된다.The band elimination filter 11 blocks the color signal band from the composite video signal input from the input buffer unit 10 and outputs the composite video signal from which the color signal is removed. The composite video signal from which the color signal is removed is input to the synchronization signal separator 12 to separate the synchronization signal from the image signal. That is, the mixed synchronous signal from which the video signal is separated, the vertical synchronous signal for distinguishing the field from the field, the field signal for distinguishing the even field from the odd field, and the burst signal are output from the sync signal separator 12.

상기 동기신호분리부(12)로부터 출력되는 신호중 버어스트신호는 또한 제1색부반송파복원부(13)와 제2색부반송파복원부(15)로 입력된다. 제1색부반송파복원부(13)는 상기 입력버퍼부(10)로부터 출력되는 복합영상신호와 상기 동기신호분리부(12)로부터 출력되는 버어스트신호를 입력받아서, 상기 버어스트신호의 위상을 기준으로 3.58MHz의 NTSC방식의 색부반송파를 발생한다. 상기 색부반송파는 제1구형파발생부(14)로 입력되고, 이 제1구형파발생부(14)는 정현파인 3.58MHz의 색부반송파를 구형파로 정형하여 출력한다.Burst signals of the signals output from the synchronization signal separator 12 are also input to the first color carrier recovery unit 13 and the second color carrier recovery unit 15. The first color carrier recovery unit 13 receives a composite video signal output from the input buffer unit 10 and a burst signal output from the synchronization signal separation unit 12 to refer to the phase of the burst signal. This generates 3.58MHz NTSC color carrier. The color carrier is input to the first square wave generator 14, and the first square wave generator 14 forms a square wave of 3.58 MHz as a sine wave and outputs the square wave.

또한,제2색부반송파복원부(15)는 상기 입력버퍼부(10)로부터 출력되는 복합영상신호와 상기 동기신호분리부(12)로부터 출력되는 버어스트신호를 입력받고, 상기 버어스트신호의 위상을 기준으로 4.43MHz의 PAL방식의 색부반송파를 발생한다. 상기 4.43MHz의 색부반송파는 제2구형파발생부(16)로 입력되고, 제2구형파발생부(16)는 정현파인 색부반송파를 구형파로 정형화시켜 출력한다.In addition, the second color carrier recovery unit 15 receives a composite video signal output from the input buffer unit 10 and a burst signal output from the synchronization signal separation unit 12, and phase of the burst signal. On the basis of this, a color carrier of 4.43MHz PAL is generated. The 4.43MHz color carrier is input to the second square wave generator 16, and the second square wave generator 16 forms a sinusoidal color carrier with a square wave and outputs the square wave.

이와같이, 제1구형파발생부(14)와 제2구형파발생부(16)에서 각각 출력되는 3.58MHz의 정형화된 색부반송파와 4.43MHz의 정형화된 색부반송파는 모드선택부(17)로 입력된다. 상기 모드선택부(17)는 제어부(도시생략)로부터 입력되는 방송방식선택신호에 의하여 3.58MHz와 4.43MHz의 색부반송파중 하나를 선택하여 출력한다. 예를들어 제어부(도시생략)로부터 로우제어신호가 입력되면 NTSC방식에의한 3.58MHz의 색부반송파가 복합영상신호로부터 분리된 색부반송파신호로써 출력되고, 제어부(도시생략)로부터 하이제어신호가 입력되면 제2구형파발생부(16)로부터 입력되는 PAL방식에의한 4.43MHz의 정형화된 신호가 분리된 색부반송파로써 출력된다.In this way, the 3.58 MHz standardized color carrier and the 4.43 MHz standardized color carrier which are respectively output from the first square wave generator 14 and the second square wave generator 16 are input to the mode selector 17. The mode selector 17 selects and outputs one of 3.58 MHz and 4.43 MHz color carriers according to a broadcast mode selection signal input from a controller (not shown). For example, when a low control signal is input from a controller (not shown), a 3.58 MHz color carrier by NTSC is output as a color carrier signal separated from the composite video signal, and a high control signal is input from the controller (not shown). In this case, the shaped signal of 4.43 MHz by the PAL method inputted from the second square wave generator 16 is output as a separate color carrier.

이와같이, 본 발명은 복합영상신호로부터 동기신호를 분리하고, 분리된 동기신호중 버어스트신호를 이용하여 색부반송파를 정확한 색부반송파를 복원하고, 상기 복원된 색부반송파를 구형파로 정형화함으로써, 상기 동기신호 및 색부반송파의 위상비교를 용이하게 하는 우수한 효과가 있는 것이다.As described above, the present invention separates the synchronization signal from the composite video signal, restores the accurate color subcarrier from the color subcarrier using the burst signal among the separated synchronizing signals, and shapes the restored color subcarrier into a square wave, There is an excellent effect of facilitating the phase comparison of color subcarriers.

Claims (1)

동기신호 분리시스템에 있어서, 외부에서 입력되는 복합영상신호의 왜곡을 막기위하여 입력단에 구비되는 입력버퍼부와, 상기입력버퍼부로부터 입력되는 복합영상신호에서 색신호를 제거하는 대역소거필터와, 상기 대역소거필터로부터 입력되는 색신호가 제거된 복합영상신호로부터 동기신호를 분리하여 출력하는 동기신호분리부와, 상기 입력버퍼부로부터 출력되는 복합영상신호와 상기 동기신호분리부로부터 출력되는 버어스트신호를 입력받아 3.58MHz의 색부반송파를 발생하는 제1색부반송파복원부와, 상기 입력버퍼부로부터 출력되는 복합영상신호와 상기 동기신호분리부로부터 출력되는 버어스트신호를 입력받아 4.43MHz 색부반송파를 발생하는 제2색부반송파복원부와, 상기 제1색부반송파복원부로부터 출력되는 3.58MHz의 색부반송파를 구형파로 정형화하는 제1구형파발생부와, 상기 제2색부반송파복원부로부터 출력되는 4.43MHz의 색부반송파를 구형파로 정형화하는 제2구형파발생부와, 상기 제1구형파발생부와 제2구형파발생부로부터 출력되는 정형화된 색부반송파를 선택출력하는 모드선택부를 구비함을 특징으로하는 동기신호 분리시스템.A synchronization signal separation system comprising: an input buffer unit provided at an input terminal to prevent distortion of a composite image signal input from an outside, a band erasing filter for removing color signals from a composite image signal input from the input buffer unit, and the band A synchronization signal separation unit for separating and outputting a synchronization signal from the composite video signal from which the color signal inputted from the erasure filter is removed, a composite video signal output from the input buffer unit, and a burst signal output from the synchronization signal separation unit; A first color carrier recovery unit for receiving a 3.58 MHz color carrier and a complex video signal output from the input buffer unit and a burst signal output from the synchronization signal separation unit for generating a 4.43 MHz color carrier carrier; A square wave of a 3.58MHz color carrier from the two-color carrier recovery unit and the first color carrier recovery unit From a first square wave generator for shaping a square wave, a second square wave generator for shaping a 4.43 MHz color carrier from an output of the second color carrier, and a square wave, from the first square wave generator and a second square wave generator And a mode selector for selecting and outputting a standardized color carrier.
KR1019950038624A 1995-10-31 1995-10-31 System for separating sync-signals KR0158410B1 (en)

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