KR930001327Y1 - Picture quality compensating circuit of vtr - Google Patents
Picture quality compensating circuit of vtr Download PDFInfo
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- KR930001327Y1 KR930001327Y1 KR2019880021097U KR880021097U KR930001327Y1 KR 930001327 Y1 KR930001327 Y1 KR 930001327Y1 KR 2019880021097 U KR2019880021097 U KR 2019880021097U KR 880021097 U KR880021097 U KR 880021097U KR 930001327 Y1 KR930001327 Y1 KR 930001327Y1
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- signal
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- color signal
- resistor
- burst
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/7908—Suppression of interfering signals at the reproducing side, e.g. noise
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/793—Processing of colour television signals in connection with recording for controlling the level of the chrominance signal, e.g. by means of automatic chroma control circuits
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안 실시예 회로도.1 is a circuit diagram of an embodiment of the present invention.
제2도는 제1도의 전압 파형도.2 is a voltage waveform diagram of FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 칼라 처리부 2 : 저역필터부1 color processing unit 2 low pass filter unit
3 : 버어스트 신호 증폭부 4 : 버퍼부3: Burst signal amplification unit 4: Buffer unit
R1-R12: 저항 C1-C6: 콘덴서R 1 -R 12 : Resistor C 1 -C 6 : Capacitor
Q1-Q3: 트랜지스터Q 1 -Q 3 : Transistor
본 고안은 브이티알 특히, 팔(PAL)방식 브이티알의 화질을 개선하기 위한 화질 보상회로에 관한 것이다.The present invention relates to an image quality compensation circuit for improving the image quality of a VTal, in particular, a PAL type VTal.
종래의 팔방식 브이티알에서 영상신호의 녹화시, 입력된 영상신호를 칼라처리부에 인가하여 4.43MHZ의 칼라신호를 626KHZ 저역 변환하고, 이 저역변환된 칼라신호를 저역필터부에 인가하여 노이즈신호를 제거한 후 칼라신호 조정용 가변저항 및 버퍼를 통해 FM신호와 합성하여 헤드에 인가하므로써 녹화가 이루어지도록 되어있으나, 팔방식의 브이티알에서는 녹화 및 재생시에 칼라 버어스트 신호를 증폭 및 감쇄시키지 못하도록 되어있으므로 엔티에스씨(MTSC)방식에 비해 해상도는 좋으나, 칼라의 휘도 SN비등이 좋지 못한 문제점이 있었다.When recording a video signal in the conventional arm type VTIAL, the input video signal is applied to the color processing unit to convert the color signal of 4.43MHZ to 626KHZ low pass, and the low-pass converted color signal is applied to the low pass filter to apply the noise signal. After removal, recording is performed by synthesizing with FM signal through the variable resistor and buffer for color signal adjustment, but the VRT of the arm type prevents amplification and attenuation of the color burst signal during recording and playback. The resolution is better than the MTSC method, but the luminance SN ratio of the color is not good.
본 고안은 이와 같은 문제점을 해결하기 의해 녹화시 저역필터부를 통한 칼라신호중에서 버어스트 신호만을 다시 증폭한 후 헤드에 인가하여 녹화하므로써 재생시 칼라 버어스트 신호를 검출하여 칼라 신호의 처리가 정확히 될 수 있도록 고안된 것이다.The present invention solves this problem by amplifying only the burst signal from the color signal through the low pass filter unit during recording and applying it to the head to record the color burst signal during playback, so that the color signal can be processed correctly. It is designed to be.
이하 본 고안 실시예의 구성 및 작용효과를 첨부도면에 의해 상세히 설명하면 다음과 같다.Hereinafter will be described in detail by the accompanying drawings the configuration and effect of the present invention as follows.
입력된 영상신호(VS)가 칼라신호를 저역변환하는 칼라 처리부(1)에 인가되고, 이 칼라처리부(1)의 출력신호가 노이즈를 제거하고 칼라신호만을 출력하는 저역필터부(2)를 통해 버어스트 게이트 펄스에 의해 칼라 버어스트 신호만을 증폭하는 버어스트 신호 증폭부(3)에 인가되며, 이 버어스트 신호 증폭부(3)의 출력신호가 칼라신호 조정용 가변저항(VR1), 버퍼부(4) 및 녹화증폭기(RA)를 통해 헤드(HD)에 인가되게 구성하고, 버어스트 신호 증폭부(3)는 저역 필터부(2)의 출력신호인 칼라신호가 입력되어 바이어스 저항(R3)(R4)을 통해 증폭용 저항(Q1)의 베이스에 인가되고, 버어스트 게이트 펄스(BG)가 바이어스 저항(R8)(R9)을 통해 베이스에 인가되는 스위칭 트랜지스터(Q2)의 콜렉터 출력이 증폭용 저항(R7) 및 커플링 콘덴서(C3)를 매개하여 에미터에 인가되는 상기 트랜지스터(Q1)의 콜렉터 출력이 커플링 콘덴서(C4)를 통해 통상의 칼리신호 조정용 가변저항(VR1)에 인가되게 구성한다.The input video signal VS is applied to the color processing unit 1 for low-conversion of the color signal, and the output signal of the color processing unit 1 is removed through the low-pass filter unit 2 for removing noise and outputting only the color signal. The burst signal amplifying section 3 which amplifies only the color burst signal by the burst gate pulse is applied. The output signal of the burst signal amplifying section 3 is a variable resistor VR 1 for color signal adjustment and a buffer section. (4) and the recording amplifier (RA) to be applied to the head (HD), the burst signal amplifying section (3) is a color signal which is an output signal of the low pass filter section 2 is inputted to the bias resistor (R3) The collector output of the switching transistor Q2, which is applied to the base of the amplification resistor Q1 through R4 and the burst gate pulse BG is applied to the base through the bias resistors R8 and R9, is used for amplification. The above applied to the emitter via the resistor R7 and the coupling capacitor C3 The collector output of the transistor Q1 is configured to be applied to the ordinary Kali signal adjustment variable resistor VR1 through the coupling capacitor C4.
이와 같이 구성된 본 고안은 영상신호(VS)가 입력되어 자동칼라 제어증폭기(ACC) 및 메인 컨버어터(CON)로 구성된 칼라 처리부(1)에 인가되면, 4.43MHZ의 칼리신호가 626KHZ신호로 저역변환되고, 이 저역변환된 칼리신호가 저역필터부(2)내의 커플링 콘덴서(C1) 및 매칭용 저항(R1)을 통해 1.2MHZ저역 여파기(LF)에 인가되면, 626KHZ의 칼라신호만을 통과시키고 다른 노이즈신호는 제거시킨후 매칭용 저항(R2) 및 커플링 콘덴서(C2)를 통해 제2도 (a)와 같은 칼라신호가 출력되어 버어스트 신호 증폭부(3)내의 증폭용 트랜지스터(Q1)의 베이스에 인가된다.According to the present invention configured as described above, when the image signal VS is input and applied to the color processing unit 1 including the automatic color control amplifier (ACC) and the main converter (CON), the Kali signal of 4.43MHZ is converted to 626KHZ signal by low frequency conversion. When the low-pass converted kali signal is applied to the 1.2 MHZ low pass filter LF through the coupling capacitor C1 and the matching resistor R1 in the low pass filter part 2, only the color signal of 626 KHZ passes and After the noise signal is removed, a color signal as shown in FIG. 2 (a) is output through the matching resistor R2 and the coupling capacitor C2, so that the amplification transistor Q1 in the burst signal amplifying unit 3 is output. Is applied to the base.
한편, 제2도 (c)와 같은 버어스트 게이트 펄스(BG)가 버어스트 신호 증폭부(3)내의 바이어스 저항(R8)(R9)을 통해 스위치 트랜지스터(Q2)의 베이스에 인가되어 버어스트 게이트 펄스(BG)기간 동안 트랜지스터(Q2)가 도통되고, 이에 따라 트랜지스터(Q1)의 콜렉터 출력에 연결된 콘덴서(C3) 및 저항(R7)의 에미터 저항이 동작되어 상기의 증폭용 트랜지스터(Q1)가 증폭작용을 하게 된다.On the other hand, the burst gate pulse BG as shown in FIG. 2 (c) is applied to the base of the switch transistor Q2 through the bias resistors R8 and R9 in the burst signal amplifying unit 3, thereby causing the burst gate. Transistor Q2 conducts during the pulse BG period, thereby operating the emitter resistors of capacitor C3 and resistor R7 connected to the collector output of transistor Q1, thereby amplifying transistor Q1. Will be amplified.
따라서, 상기 트탠지스터(Q1)의 콜렉터 출력은 제2도 (b)와 같이 칼라신호중 버어스터신호만 증폭된 칼라신호가 출력되어 커플링 콘덴서(C4) 및 칼라신호 조정용 가변저항(VR1)을 통해 버퍼부(4)에 인가되고, 상기버퍼부(4)를 통한 칼라신호는 RM신호와 합성된 후 녹음 증폭기(R4)에서 증폭되며, 상기 증폭기(R4)를 통해 증폭된 칼라신호가 헤드(HD)에 의해 녹화되는 것이다.Accordingly, the collector output of the transistor Q1 is outputted through the coupling capacitor C4 and the variable resistor VR1 for adjusting the color signal, as shown in FIG. The color signal applied to the buffer unit 4, the color signal through the buffer unit 4 is synthesized with the RM signal and then amplified by the recording amplifier R4, and the color signal amplified through the amplifier R4 is the head HD. Will be recorded.
이와 같이 본 고안은 저역변환된 칼라신호를 버어스트 신호만을 다시 증폭한 후 헤드를 통해 녹화하므로써 재생시에 증폭된 칼라 버어스트 신호를 검출하여 칼라신호처리에 정확도를 높여줄 수 있어 칼라 캐리어 누설이 감소하고, 칼라신호와 잡음신호의 전력비인 SN비가 향상됨에 따라 깨끗한 화질의 화면을 볼 수 있게 되는 효과를 갖는다.In this way, the low-conversion color signal is amplified only by the burst signal, and then recorded through the head to detect the amplified color burst signal during playback, thereby improving accuracy in color signal processing, thereby reducing color carrier leakage. In addition, as the SN ratio, which is the power ratio of the color signal and the noise signal, is improved, the screen having a clear image quality can be seen.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880021097U KR930001327Y1 (en) | 1988-12-20 | 1988-12-20 | Picture quality compensating circuit of vtr |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880021097U KR930001327Y1 (en) | 1988-12-20 | 1988-12-20 | Picture quality compensating circuit of vtr |
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| Publication Number | Publication Date |
|---|---|
| KR900013153U KR900013153U (en) | 1990-07-05 |
| KR930001327Y1 true KR930001327Y1 (en) | 1993-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019880021097U KR930001327Y1 (en) | 1988-12-20 | 1988-12-20 | Picture quality compensating circuit of vtr |
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| KR (1) | KR930001327Y1 (en) |
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1988
- 1988-12-20 KR KR2019880021097U patent/KR930001327Y1/en not_active IP Right Cessation
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| KR900013153U (en) | 1990-07-05 |
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