KR930006186Y1 - Tv contrast signal noise level deduction circuit - Google Patents

Tv contrast signal noise level deduction circuit Download PDF

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Publication number
KR930006186Y1
KR930006186Y1 KR2019910006484U KR910006484U KR930006186Y1 KR 930006186 Y1 KR930006186 Y1 KR 930006186Y1 KR 2019910006484 U KR2019910006484 U KR 2019910006484U KR 910006484 U KR910006484 U KR 910006484U KR 930006186 Y1 KR930006186 Y1 KR 930006186Y1
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signal
unit
coring
pass filter
passing
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KR2019910006484U
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KR920022411U (en
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오희덕
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주식회사 금성사
이헌조
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

내용 없음.No content.

Description

텔레비젼의 휘도잡음 경감회로TV's luminance noise reduction circuit

제1도는 종래의 휘도잡음 경감회로도.1 is a conventional luminance noise reduction circuit diagram.

제2도는 코어링부의 상세회로도.2 is a detailed circuit diagram of the coring portion.

제3도는 본 고안에 따른 휘도잡음 경감회로도이다.3 is a luminance noise reduction circuit diagram according to the present invention.

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

1 : 저역통과 필터부 2 : 고역통과 필터부1: low pass filter part 2: high pass filter part

3 : 코어링부 4 : 증폭부3: coring part 4: amplifying part

5 : 합성기 6 : 입력단자5: synthesizer 6: input terminal

7 : 코어링양 제어부7: coring amount control unit

본 고안은 강전계에 신호인가시 해상도의 저하를 방지할 수 있는 텔레비젼의 휘도잡음을 경감회로에 관한 것이다.The present invention relates to a circuit for reducing the luminance of a luminance of a television that can prevent a decrease in resolution when a signal is applied to a strong electric field.

종래의 회로는 제1도에 도시한 바와 같이 저항(R1), 커패시터(C1-C2)등으로 이루어져 인가되는 휘도신호성분중 저역성분을 통과시키는 저역통과 필터부(1)와, 저항(R2), 커패시터(C3-C4)등으로 이루어져 인가되는 휘도신호 성분중 고역신호를 통과시키기 위한 고역통과 필터부(2)와, 고역통과 필터부(2)를 통과한 고역신호에서 잡음신호 성분을 제거하기 위한 코어일부(3)와, 코어링부(3)를 거친 신호를 증폭하기 위한 증폭부(4), 증폭된 신호와 저역통과 필터부(1)의 저역신호를 합성시키기 위한 합성기(5)와, 트랜지스터(Q1), 다이오드(D1), 저항(R5-R7)등으로 이루어져, 저역통과 필터부(1) 및 증폭부(4)를 스위칭하는 스위칭부(8)로 구성된다.As shown in FIG. 1, the conventional circuit includes a resistor R1, capacitors C 1 -C 2 , and the like, and a low pass filter unit 1 for passing a low band component among luminance signal components applied thereto, and a resistor ( Noise in the high pass signal passed through the high pass filter unit 2 and the high pass filter unit 2 for passing the high pass signal among the luminance signal components applied by R 2 ) and capacitors C 3 -C 4 , etc. A synthesizer for synthesizing the low frequency signal of the core part 3 for removing the signal component, the amplifying part 4 for amplifying the signal passing through the coring part 3, and the amplified signal and the low pass filter part 1; (5), a switching unit (8) consisting of a transistor (Q 1 ), a diode (D 1 ), a resistor (R 5 -R 7 ), etc., to switch the low pass filter unit (1) and the amplification unit (4). It consists of.

제2도는 코어링부(3)의 상세회로도로서, 그 동작을 설명하면, 큰 신호가 입력될 경우에는 다이오드(D2,D3)는 온되어 통과되며 잡음 등의 작은 신호가 입력된 경우에는 저항(R9-R14)의 세팅된 전압에 의해 다이오드(D2,D3)가 오크되어 신호가 통과되지 못하게 된다.FIG. 2 is a detailed circuit diagram of the coring unit 3, and the operation thereof will be described. When a large signal is input, the diodes D 2 and D 3 are turned on and a resistor is input when a small signal such as noise is input. The set voltage of (R 9 -R 14 ) causes the diodes (D 2 , D 3 ) to oak and prevent the signal from passing through.

a에 따라, 잡음성분이 제거된 신호가 출력되게 된다.According to a, the signal from which the noise component is removed is output.

일단, 마이콤 또는 스위치(도시하지 않음)에 의해 스위칭부(8)이 입력단자(6)에 하이전압이 인가되면 트랜지스터(Q1)가 세츄레이션되어 저역통과필터(1)가 동작되며, 다이오드(D1)는 오프되어 저항(R5, R6)에 의해 세팅된 전압에 따라 잡음이 제거된 고역신호 성분이 증폭되어 합성기(5)를 통해 합성신호가 출력되게 된다.Once the high voltage is applied to the input terminal 6 by the switching unit 8 by a microcomputer or a switch (not shown), the transistor Q1 is partitioned to operate the low pass filter 1 and the diode D1. ) Is turned off so that the high-frequency signal component from which the noise is removed is amplified according to the voltage set by the resistors R 5 and R 6 so that the synthesized signal is output through the synthesizer 5.

만일, 입력단자(6)에 로우전압이 인가되면 트랜지스터(Q1)가 오프되어 이미 입력된 휘도신호가 저역통과필터(1)를 거치지 않고 합성기(5)로 입력되고, 다이오드(D1)는 온되어 코어링 출력의 증폭부(4)의 증폭도가 0이되므로 합어기(5)의 출력신호는 휘도신호와 같게 된다.If a low voltage is applied to the input terminal 6, the transistor Q1 is turned off so that the luminance signal already input is input to the synthesizer 5 without passing through the low pass filter 1, and the diode D1 is turned on. Since the amplification degree of the amplifying section 4 of the coring output becomes zero, the output signal of the adder 5 becomes equal to the luminance signal.

그러나, 이와 같이 구성된 종래 회로는 사용자가 리모콘이나 스위치등으로 턴온시켰을 때 해상도가 저하되는 문제점이 있었다.However, the conventional circuit configured as described above has a problem in that the resolution is lowered when the user turns on the remote controller or the switch.

특히, 강전계의 신호가 입력될 때 불필요하게 해상도만 저하되어 화면의 선명도가 저하되는 용이 되었다.In particular, when a signal of a strong electric field is input, only the resolution is unnecessarily reduced and the sharpness of the screen is easily reduced.

본 고안은 이와 같은 문제점을 해결하기 위한 것으로, 전계강도에 따라 코어링 양을 가변시키는 텔레비젼의 휘도잡음 경감회로를 제공하는 것이다.The present invention has been made to solve such a problem, and to provide a luminance noise reduction circuit of a television that varies the amount of coring in accordance with the electric field strength.

이하, 본 고안을 첨부도면에 의하여 상세히 설명한다.Hereinafter, the present invention will be described in detail by the accompanying drawings.

제3도는 본 고안에 따른 회로도로서, 종래의 회로인 제1도의 회로에 있어서 튜너자동이득제어 전압을 이용하여 코어링양을 제어하기 위한 코어링양 제어부(7)를 코어링부(3)에 연결시켜 구성한 것이다.FIG. 3 is a circuit diagram according to the present invention, in which the coring amount control unit 7 is connected to the coring unit 3 to control the amount of coring using the tuner automatic gain control voltage in the circuit of FIG. will be.

코어링양 제어부(7)는 트랜지스터(Q3), 저항(R15,R16)으로 된 반전부(7a)와 직류레벨 정합을 위하여 제어다이오드(D4), 저항(R17,R18)으로 된 레벨시프트부(7b)와, 트랜지스터(Q4), 저항(R11)으로 된 완충증폭부(7c)로 구성된다.The coring amount control unit 7 is connected to the control unit D 4 and the resistors R 17 and R 18 for DC level matching with the inverting unit 7a including the transistors Q 3 and resistors R 15 and R 16 . A level shift section 7b, a buffer amplifier section 7c comprising a transistor Q 4 and a resistor R 11 .

본 고안의 회로동작을 설명하면, 강전계의 신호가 인가될 때 높은 전압이 트랜지스터(Q3)의 베이스에 인가되고 반전부(7a)에 의해 반전된 낮은 전압이 레벨시프트부(7b)에 인가되어 코어링 제어에 작당하도록 직류 레벨시프트된다.In the circuit operation of the present invention, when a signal of a strong electric field is applied, a high voltage is applied to the base of the transistor Q3, and a low voltage inverted by the inversion unit 7a is applied to the level shift unit 7b. DC level shifted to correspond to the coring control.

이 전압이 완충증폭부(7c)의 트랜지스터(Q4)의 베이스에 인가되고 완충된 증폭전압이 코어링부(3)에 인가되게 된다.This voltage is applied to the base of the transistor Q4 of the buffer amplifier 7c and the buffered amplification voltage is applied to the coring unit 3.

즉, 강전계 신호가 입력되면 낮은 코어일 제어전압이 입력되어 휘도잡음 경감제어양을 줄여 해상도의 저하를 막고, 약전계의 신호가 인가되면 높은 코어링 제어전압이 입력되어 잡음을 자동적으로 경감시키게 된다.That is, when a strong electric field signal is input, a low core control voltage is input to reduce the luminance noise reduction control amount, thereby preventing a decrease in resolution, and when a weak electric field signal is applied, a high coring control voltage is input to automatically reduce noise. do.

또한 사용자가 외부입력선택시, 즉 VTR(Video Tape Recorder)이니 VDP(Video Display Processor)등의 외부 비디오 신호 입력 선택시에는 튜너와 상관없이 비디오 신호가 입력되기 때문에 제1도와 동일한 동작을 하게 된다.In addition, when the user selects an external input, that is, a VTR (Video Tape Recorder), and selects an external video signal input such as a VDP (Video Display Processor), the video signal is input regardless of the tuner.

이상 설명한 바와 같이, 본 고안에 따르면 튜너 자동이득제어전압을 추출하여 이 전압변동분을 코어링 제어에 이용하게 됨으로써, 사용자가 입력신호에 따라 휘도잡음 경감의 온, 오르제어를 일일이 할 필요가 없으며, 전제강도의 변화에 따라 코어링양의 가변됨으로써 일정한 코오링 제어된 것에 비하여 해상도 저하를 막아 최상의 화질을 사용자게에 제공할 수 있는 효과가 있다.As described above, according to the present invention, the tuner automatic gain control voltage is extracted and the voltage variation is used for the coring control, so that the user does not have to turn on or rise the luminance noise reduction according to the input signal. By varying the amount of coring in accordance with the change in the overall strength, there is an effect that can provide the best image quality to the user by preventing the resolution degradation compared to a constant coating control.

Claims (2)

휘도성분중 저역성분을 통과시키는 저역통과 필터부(1)와, 휘도성분중 고역신호성분을 통과시키는 고역통과 필터부(2)와, 상기 고역통과 필터부(2)를 통과한 고역신호에서 잡음신호성분을 제거하기 위한 코어링부(3)와 코어링부(3)를 거친 신호를 증폭하기 위한 증폭부(4)와, 증폭부(4)에 의해 증폭된 신호와 저역통과 필터부(1)를 통과한 저역신호를 합성시키기 위한 합성부(5)와, 튜너자동이득 제어전압에 의해 코어링양을 제어하기 위한 코어링양 제어부(7)와, 상기 저역통과 필터부(1) 및 증폭부(4)를 스위칭하기 위한 스위칭(8)를 포함하여 구성됨을 특징으로 하는 텔레비젼의 휘도잡음 경감회로.Noise in the high pass signal passing through the low pass filter unit 1 for passing the low pass component among the luminance components, the high pass filter unit 2 for passing the high pass signal component among the luminance components, and the high pass signal passing through the high pass filter unit 2; The amplification unit 4 for amplifying the signal passing through the coring unit 3 and the coring unit 3 for removing the signal component, and the signal and the low pass filter unit 1 amplified by the amplifying unit 4 A synthesizing unit 5 for synthesizing the low pass signal, a coring amount control unit 7 for controlling the amount of coring by the tuner automatic gain control voltage, and the low pass filter unit 1 and the amplifying unit 4 And a switching (8) for switching the noise reduction circuit of the television. 제1항에 있어서, 상기 코어링향 제어부(7)는 입력전압을 반전시키는 반전부(7a)와, 반전된 신호를 직류레벨 정합시키는 레벨시프트부(7b)와, 직류레벨 정합된 신호를 완충증폭시키는 완충증폭부(7c)로 구성된 것을 특징으로 하는 텔레비젼의 휘도잡음 경감회로.2. The coring directional control unit (7) according to claim 1, wherein the coring aroma control unit (7) buffers an inverting section (7a) for inverting the input voltage, a level shift section (7b) for matching the inverted signal to a DC level, and a DC level matching signal. A noise reduction circuit for television, comprising a buffer amplifier (7c).
KR2019910006484U 1991-05-07 1991-05-07 Tv contrast signal noise level deduction circuit KR930006186Y1 (en)

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Application Number Priority Date Filing Date Title
KR2019910006484U KR930006186Y1 (en) 1991-05-07 1991-05-07 Tv contrast signal noise level deduction circuit

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Application Number Priority Date Filing Date Title
KR2019910006484U KR930006186Y1 (en) 1991-05-07 1991-05-07 Tv contrast signal noise level deduction circuit

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KR920022411U KR920022411U (en) 1992-12-19
KR930006186Y1 true KR930006186Y1 (en) 1993-09-15

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