KR930002148Y1 - Output control circuit of tv receiver - Google Patents

Output control circuit of tv receiver Download PDF

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Publication number
KR930002148Y1
KR930002148Y1 KR2019880002904U KR880002904U KR930002148Y1 KR 930002148 Y1 KR930002148 Y1 KR 930002148Y1 KR 2019880002904 U KR2019880002904 U KR 2019880002904U KR 880002904 U KR880002904 U KR 880002904U KR 930002148 Y1 KR930002148 Y1 KR 930002148Y1
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KR
South Korea
Prior art keywords
signal
output
output control
video
control circuit
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KR2019880002904U
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Korean (ko)
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KR890020269U (en
Inventor
정상철
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주식회사 금성사
최근선
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Priority to KR2019880002904U priority Critical patent/KR930002148Y1/en
Publication of KR890020269U publication Critical patent/KR890020269U/en
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Publication of KR930002148Y1 publication Critical patent/KR930002148Y1/en

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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
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H04N5/505—Invisible or silent tuning

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

Abstract

내용 없음.No content.

Description

텔레비젼 수상기의 출력 제어회로Output control circuit of television receiver

첨부된 도면은 본 고안의 출력 제어회로도이다.The accompanying drawings are output control circuit diagrams of the present invention.

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

1 : 저역통과필터 2 : 음성출력 제어부1: low pass filter 2: voice output control unit

3 : 영상출력 제어부 4 : 표시부3: Image output control unit 4: Display unit

COMP : 비교기COMP: Comparator

본 고안은 텔레비젼 수상기에 있어서, 수신되는 방송신호 또는 비디오 카세트 레코더 등의 기기에서 입력되는 외부신호가 없을 경우에 영상 및 음성신호가 출력되지 않게한 텔레비젼 수상기의 출력 제어회로에 관한 것이다.The present invention relates to an output control circuit of a television receiver in which video and audio signals are not output when there is no external signal input from a device such as a received broadcast signal or a video cassette recorder.

종래의 텔레비젼 수상기는 영상신호가 없을 경우에 동기신호가 없는 상태로 브라운관에 주사하여 잡음신호가 나타남은 물론 스피커로 잡음신호가 출력되어 사용자에게 불쾌감을 주는 결함이 있었다.In the conventional television receiver, when there is no video signal, a noise signal is displayed by scanning a CRT without a synchronization signal, and a noise signal is output to a speaker.

본 고안은 이와같은 종래의 결함을 감안하여, 동기신호로 영상신호의 유무를 판별하고, 그 판별결과에 따라 영상및 음성신호의 출력을 제어함은 물론 영상신호의 유무를 표시하게 안출한 것으로, 이를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.The present invention has been made in view of the above-mentioned deficiencies, and discriminates the presence or absence of a video signal with a synchronous signal, and controls the output of the video and audio signals according to the determination result, and displays the presence or absence of a video signal. This will be described in detail with reference to the accompanying drawings.

첨부된 도면은 본 고안의 출력 제어회로도로서, 이에 도시한 바와같이 수직동기신호 입력단자(VSY)를 저항(R1)및 콘덴서(C1)로 된 저역통과필터(1)를 통해 비교기(COMP)의 비반전입력단자(+)에 접속하고, 비교기(COMP)의 반전입력단자(-)는 접지시켜 비교기(COMP)의 출력단자를 정전압 다이오드(ZD1, ZD2)에 접속하며, 그 접속점을 저항(R2)(R3)을 통해서는 음성 및 영상출력을 제어하는 전계효과 트랜지스터(FET1)(FET2)의 게이트에 접속하여 음성 및 영상출력 제어부(2)(3)를 구성하고, 저항(R4)을 통해서는 저항(R5)및 트랜지스터(TR1)의 베이스에 접속하고, 트랜지스터(TR1)의 콜렉터는 저항(R6)에 접속함과 아울러 그 접속점을 저항(R7)을 통해 발광다이오드(LED)에 접속하여 표시부(4)를 구성한 것으로 도면의 설명중 미설명 부호 Vcc는 전원단자이다.The accompanying drawings are an output control circuit diagram of the present invention, and as shown therein, the vertical synchronizing signal input terminal VSY is a comparator COMP through a low pass filter 1 composed of a resistor R 1 and a capacitor C 1 . ), The inverting input terminal (-) of the comparator (COMP) is grounded, and the output terminal of the comparator (COMP) is connected to the constant voltage diodes (ZD 1 , ZD 2 ). by connecting the gate of the resistance (R 2) a field effect transistor is to control the audio and video output through a (R 3) (FET 1) (FET 2) and configure the audio and video output control unit (2) (3) through, a resistance (R 4) is a resistor (R 5) and the transistor also as well as the connection point resistor connected to the base of (TR 1) and the collector of the transistor (TR 1) is connected to the resistor (R 6) (R The display unit 4 is configured by connecting to a light emitting diode (LED) through 7 ). In the description of the drawings, reference numeral Vcc denotes a power supply terminal.

이와같이 구성된 본 고안은 전원단자(Vcc)에 전원이 인가된 상태에서 영상신호가 있을 경우에 영상신호에 혼합된 수직동기신호가 수직동기신호 입력단자(VSY)로 입력되어 저역통과필터(1)를 통해 비교기(COMP)의 비반전입력단자(+)에 인가되므로 비교기(COMP)는 고전위를 출력하여 저항(R2)(R3)을 통해 전계효과 트랜지스터(FET1)(FET2)의 게이트에 인가됨과 아울러 저항(R4)을 통해 트랜지스터(TR1)의 베이스에 인가된다.According to the present invention, the vertical synchronization signal mixed with the video signal is input to the vertical synchronization signal input terminal VSY when the image signal is present in the state where the power is applied to the power terminal Vcc. Since it is applied to the non-inverting input terminal (+) of the comparator (COMP), the comparator (COMP) outputs a high potential to the gate of the field effect transistor (FET 1 ) (FET 2 ) through the resistor (R 2 ) (R 3 ) It is applied to the base of the transistor TR 1 through the resistor R 4 .

따라서, 전계효과 트랜지스터(FET1)가 도통상태로 되므로 음성신호가 전계효과 트랜지스터(FET1)를 통해 음성 증폭기에 입력되어 스피커로 출력되고, 전계효과 트랜지스터(FET2)도 도통상태 되므로 영상신호가 전계효과 트랜지스터(FET2)를 통해 휘도부에 입력되어 브라운관에 정상화면이 나타나며, 트랜지스터(TR1)는 온되어 전원단자(Vcc)의 전원이 저항(R6)을 통해 트랜지스터(TR1)로 흐르게 되고, 발광다이오드(LED)는 점등되지 않게된다.Accordingly, since in the conductive state field-effect transistor (FET 1) Since the voice signal is input to the audio amplifier via a field effect transistor (FET 1) is output to the speaker, a field effect transistor (FET 2) is also rendered conductive video signal is A normal screen appears in the CRT through the field effect transistor FET 2 , and the transistor TR 1 is turned on so that the power supply of the power supply terminal Vcc goes to the transistor TR 1 through the resistor R 6 . The light emitting diodes (LEDs) do not turn on.

그리고, 영상신호가 없을 경우에는 수직동기신호 입력단자(VSY)로 수직동기 신호가 입력되지 않아 비교기(COMP)의 비반전입력단자(+)에 저전위가 인가되므로 비교기(COMP)는 저전위를 출력하고, 이에따라 상기와는 반대로 전계효과 트랜지스터(FET1)가 차단상태로 되어 스피커로 아무 신호도 출력되지 않음과 아울러 전계효과 트랜지스터(FET2)도 차단 상태로 되어 브라운관의 휘도는 매우 어둡게 되며, 또한, 트랜지스터(TR1)는 오프되어 전원단자(Vcc)의 전원이 저항(R6, R7)을 통해 발광다이오드(LED)로 흐르게 되므로 발광 다이오드(LED)가 점등되어 영상신호가 없음을 표시하게 된다.If there is no video signal, since the vertical synchronous signal is not input to the vertical synchronous signal input terminal VSY, a low potential is applied to the non-inverting input terminal (+) of the comparator COMP. On the contrary, the field effect transistor FET 1 is turned off, and no signal is output to the speaker, and the field effect transistor FET 2 is turned off, so that the luminance of the CRT becomes very dark. In addition, since the transistor TR 1 is turned off so that the power of the power supply terminal Vcc flows to the light emitting diode LED through the resistors R 6 and R 7 , the light emitting diode LED is turned on to indicate that there is no image signal. Done.

이상에서 상세히 설명한 바와같은 본 고안은 영상신호가 없을 경우에 이를 판별하여 스피커로 아무 신호도 출력되지 않게 함과 아울러 브라운관의 휘도를 어둡게 함으로써 사용자가 쾌적한 상태로 텔레비젼 수상기를 시청할 수 있는 효과가 있다.The present invention as described in detail above, when there is no video signal, it is determined that no signal is output to the speaker, and by darkening the brightness of the CRT, the user can watch a TV receiver in a comfortable state.

Claims (1)

수직동기 신호가 평활하는 저역통과필터(1)와, 상기 저역통과필터(1)의 출력신호로 영상신호의 유무를 검출하는 비교기(COMP)와, 상기 비교기(COMP)의 출력신호에 따라 음성 신호의 출력을 제어하는 음성출력 제어부(2), 영상신호의 출력을 제어하는 영상출력 제어부(3) 및 영상신호가 없음을 표시하는 표시부(4)로 구성함을 특징으로 하는 텔레비젼 수상기의 출력제어회로.A low pass filter 1 having a smooth vertical synchronization signal, a comparator COMP detecting a presence or absence of an image signal as an output signal of the low pass filter 1, and an audio signal according to the output signal of the comparator COMP An output control circuit of a television receiver characterized in that it comprises an audio output control section 2 for controlling the output of the video signal, a video output control section 3 for controlling the output of the video signal, and a display section 4 for displaying no video signal. .
KR2019880002904U 1988-03-03 1988-03-03 Output control circuit of tv receiver KR930002148Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019880002904U KR930002148Y1 (en) 1988-03-03 1988-03-03 Output control circuit of tv receiver

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Application Number Priority Date Filing Date Title
KR2019880002904U KR930002148Y1 (en) 1988-03-03 1988-03-03 Output control circuit of tv receiver

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KR890020269U KR890020269U (en) 1989-10-05
KR930002148Y1 true KR930002148Y1 (en) 1993-04-26

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