KR940001840B1 - Chrominance signal processing circuit - Google Patents
Chrominance signal processing circuit Download PDFInfo
- Publication number
- KR940001840B1 KR940001840B1 KR1019900022078A KR900022078A KR940001840B1 KR 940001840 B1 KR940001840 B1 KR 940001840B1 KR 1019900022078 A KR1019900022078 A KR 1019900022078A KR 900022078 A KR900022078 A KR 900022078A KR 940001840 B1 KR940001840 B1 KR 940001840B1
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- South Korea
- Prior art keywords
- color
- phase
- amplifier
- comparator
- signal processing
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- 239000003086 colorant Substances 0.000 claims description 2
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Classifications
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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
- H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
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- 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
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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
- H04N9/66—Circuits for processing colour signals for synchronous demodulators
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Color Television Systems (AREA)
Abstract
Description
제1도는 본 발명 선택적 색신호처리회로의 구성도.1 is a block diagram of a selective color signal processing circuit of the present invention.
제2도는 종래 색신호처리회로의 구성도이다.2 is a configuration diagram of a conventional color signal processing circuit.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 제1대역증폭기 2 : 제2대역증폭기1: first band amplifier 2: 2nd band amplifier
3 : 자동이득조절기 4 : 위상검파기3: automatic gain controller 4: phase detector
5 : 색부반송파발진기 6 : 위상변화회로5: color carrier oscillator 6: phase shift circuit
7 : 색복조회로 8 : 진폭제한기7: Color demodulation circuit 8: Amplitude limiter
9 : 위상비교기 10 : 전압비교기9: phase comparator 10: voltage comparator
11 : 가변증폭기 12, 12' : 외부가변저항11: variable amplifier 12, 12 ': external variable resistor
A : 색신호 B : 색진폭조정전압A: Color signal B: Color amplitude adjustment voltage
C : 색동기펄스신호 D : 적색부반송파신호C: Color sync pulse signal D: Red subcarrier signal
E : 청색부반송파신호 F : R-Y(적색차신호)출력E: Blue subcarrier signal F: R-Y (red difference signal) output
G : G-Y(녹색차신호)출력 H : B-Y(청색차신호)출력G: G-Y (green difference signal) output H: B-Y (blue difference signal) output
본 발명은 VTR이나 TV등 영상기기의 특정 색신호를 증폭처리하거나 감쇠처리하는 색신호처리회로에 관한 것이다.The present invention relates to a color signal processing circuit for amplifying or attenuating a specific color signal of a video device such as a VTR or a TV.
종래 영상기기의 색신호처리계는 제2도에 도시한 바와 같이 제1대역증폭기(1)와, 제2대역증폭기(2), 자동이득조절기(3), 위상검파기(4), 색부반송파발진기(5), 위상변화회로(6) 및 색복조회로(7)로 구성되어 있어서, 색신호(A)가 입력되면, 제1, 2대역증폭기(1, 2)와 자동이득조절기(3)를 통해 색신호가 증폭되고 자동으로 이득이 조절되며, 위상검파기(4)가 입력되는 색신호(A)의 기준위상에 색부반송파 발진기(5)에서 생성된 색부산송파의 위상을 일치시켜 색복조회로(7)에서 색이 복조된다. 이때, 외부가변전압으로 대역증폭기의 증폭도를 조종하여 복조되는 색차출력의 크기(농도)를 증감시키고, 위상변화회로(6)를 제어하여 적·녹·청색차출력의 색상을 변화시킨다. 그 결과 전반적인 색신호의 증폭·감쇠를 할 수 있으나, 적·녹·청의 색종래별로 색을 선별적으로 증폭하거나 감소시킬 수 없다고 하는 문제점이 있었다.As shown in FIG. 2, a color signal processing system of a conventional imaging apparatus includes a first band amplifier 1, a second band amplifier 2, an automatic gain controller 3, a phase detector 4, and a color carrier oscillator ( 5), consisting of a phase change circuit 6 and a color demodulation circuit 7, when the color signal A is input, the color signal through the first and second band amplifiers 1 and 2 and the automatic gain controller 3; Is amplified and the gain is automatically adjusted, and the phase detector 4 matches the phase of the color subcarrier generated by the color subcarrier oscillator 5 on the reference phase of the input color signal A in the color demodulation circuit 7. The color is demodulated. At this time, by controlling the amplification degree of the band amplifier by the external variable voltage, the magnitude (density) of the color difference output to be demodulated is increased, and the phase change circuit 6 is controlled to change the color of the red, green and blue difference outputs. As a result, the overall color signal can be amplified and attenuated, but there is a problem that the color cannot be selectively amplified or reduced for each color of red, green, and blue.
따라서 본 발명은 상기한 실정을 감안하여 종래 영상기기에 있는 색신호처리회로의 문제점을 해결하고자 발명한 것으로, VTR 또는 TV시청자의 취향에 맞게 일정한 색을 선택하여 증폭·감쇠 시킬 수 있는 선택적 색신호처리회로를 제공함에 그 목적이 있다.Accordingly, the present invention has been made to solve the problems of the color signal processing circuit in a conventional video apparatus in view of the above situation, and is a selective color signal processing circuit that can select and amplify and attenuate a certain color according to the taste of the VTR or TV viewer. The purpose is to provide.
상기한 목적을 달성하기 위한 본 발명 선택적 색신호처리회로는 제1대역증폭기(1)와 제2대역증폭기(2), 자동이득조절기(3), 위상검파기(4), 색부반송파발진기(5), 위상변화회로(6) 및 색복조회로(7)를 구비하여 색신호(A)를 처리하는 색신호처리회로에 있어서, 상기 제2대역증폭기(2)와 위상검파기(4)의 접속부에 진폭제한기(8)를 연결함과 더불어 가변증폭기(11)를 연결하고, 진폭제한기(8)에 위상비교기(9)를 통해 전압비교기(10)를 연결하며, 전압비교기(10)의 출력단에 상기 가변증폭기(11)를 연결하고, 외부가변저항(12, 12') 각각을 상기 전압비교기(10), 가변증폭기(11)에 각각 연결함과 더불어 상기 위상변화회로(6)의 청색부반송파신호출력단에 위상비교기(9)를 연결구성하여 색종류별로 색을 선별적으로 처리할 수 있음을 특징으로 한다.The selective color signal processing circuit of the present invention for achieving the above object includes a first band amplifier (1) and a second band amplifier (2), an automatic gain controller (3), a phase detector (4), a color carrier oscillator (5), In a color signal processing circuit having a phase change circuit (6) and a color demodulation circuit (7) for processing a color signal (A), an amplitude limiter is formed at a connection portion of the second band amplifier (2) and the phase detector (4). 8) and a variable amplifier 11, a voltage comparator 10 through a phase comparator 9 to an amplitude limiter 8, and the variable amplifier at the output of the voltage comparator 10. (11), and each of the external variable resistors (12, 12 ') to the voltage comparator (10) and the variable amplifier (11), respectively, and a phase at the blue subcarrier signal output terminal of the phase change circuit (6). The comparator 9 is configured to connect and selectively process colors for each color type.
이하 첨부도면을 참조하여 본 발명의 작용 및 효과를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the operation and effect of the present invention.
먼저, 제1대역증폭기(1)로 입력된 색신호(A)는 제1대역증폭기(1)와 자동이득조절기(3)을 거치면서 증폭되고 자동으로 이득이 조절되며, 제2대역증폭기(2)에서 색진폭조정전압(B)으로 진폭이 변화되어 위상검파기(4)와 진폭제한기(8) 및 가변증폭기(11)로 입력된다.First, the color signal A input to the first band amplifier 1 is amplified and automatically adjusted through the first band amplifier 1 and the automatic gain controller 3, and the second band amplifier 2 is adjusted. The amplitude is changed from the color amplitude adjustment voltage B to the phase detector 4, the amplitude limiter 8, and the variable amplifier 11, respectively.
위상검파기(4)로 입력된 색신호(A)는 색부반송파발진기(5)로 인가되어 색부반송파발진기(5)의 발진주파수 및 위상을 일정하게 하며, 진폭제한기(8)로 입력된 색신호(A)는 진폭이 제한되어 위상비교기(9)로 입력되며, 위상비교기(9)에서는 제2대역증폭기(2)로부터 진폭제한기(8)를 거쳐 입력된 색신호의 위상과 기준위상인 위상변화회로(6)로부터 출력되는 청색부반송파(E)의 위상을 비교하여 그 위상차를 전압차로서 전압비교기(10)로 출력한다.The color signal A input to the phase detector 4 is applied to the color carrier oscillator 5 to make the oscillation frequency and phase of the color carrier oscillator 5 constant, and the color signal A input to the amplitude limiter 8. ) Is limited in amplitude and input to the phase comparator 9, and in the phase comparator 9, a phase shift circuit which is the phase and reference phase of the color signal input from the second band amplifier 2 through the amplitude limiter 8 ( The phases of the blue subcarriers E outputted from 6) are compared and the phase difference is output to the voltage comparator 10 as a voltage difference.
전압비교기(10)에서는 위상비교기(9)로부터 입력되는 전압중 특정한 전압을 외부가변저항(12)의 저항조절에 의한 전압조정으로 추출하여 가변증폭기(11)로 전달하며, 가변증폭기(11)에서는 제2대역증폭기(2)에서 입력되는 색신호가 기본적으로 증폭도 1로 증폭되지만, 전압비교기(10)에서 전달된 특정전압기간에는 외부가변저항(12')의 조절에 의한 전압조정으로 증폭도가 조정된다.In the voltage comparator 10, a specific voltage among the voltages input from the phase comparator 9 is extracted by voltage adjustment by resistance control of the external variable resistor 12 and transferred to the variable amplifier 11, and in the variable amplifier 11, Although the color signal input from the second band amplifier 2 is basically amplified by the amplification degree 1, in the specific voltage period transmitted from the voltage comparator 10, the amplification degree is adjusted by adjusting the voltage by adjusting the external variable resistor 12 '. do.
가변증폭기(11)를 거친 색신호는 색복조회로(7)에서 복조되는데 이와 같은 신호처리로 인하여 외부가변저항조절에 의한 전압조정으로 선택되는 특정위상의 신호가 증폭·감쇠된후 복조되어 R-Y, G-Y, B-Y의 색차신호(F, G, H)로서 출력된다.The color signal passed through the variable amplifier 11 is demodulated in the color demodulation circuit 7. Due to the signal processing, the signal of a specific phase selected by voltage adjustment by external variable resistance control is amplified and attenuated and then demodulated to be RY and GY. And BY are output as color difference signals F, G, and H.
상기한 바와 같이 작용하는 본 발명 선택적 색신호처리회로는 사용자가 필요에 따라 임의로 색신호중 특정한 색을 선택하여 증폭·감쇠시킬 수 있는 장점이 있으므로 각종 영상기기에 응용할 수 있는 유용한 발명이다.The selective color signal processing circuit of the present invention that acts as described above is a useful invention that can be applied to various video devices because the user can arbitrarily select and amplify and attenuate a specific color among color signals as needed.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019900022078A KR940001840B1 (en) | 1990-12-28 | 1990-12-28 | Chrominance signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019900022078A KR940001840B1 (en) | 1990-12-28 | 1990-12-28 | Chrominance signal processing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR920014274A KR920014274A (en) | 1992-07-30 |
| KR940001840B1 true KR940001840B1 (en) | 1994-03-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019900022078A KR940001840B1 (en) | 1990-12-28 | 1990-12-28 | Chrominance signal processing circuit |
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| Country | Link |
|---|---|
| KR (1) | KR940001840B1 (en) |
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1990
- 1990-12-28 KR KR1019900022078A patent/KR940001840B1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR920014274A (en) | 1992-07-30 |
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