KR960003376Y1 - Pop noise removing circuit - Google Patents
Pop noise removing circuitInfo
- Publication number
- KR960003376Y1 KR960003376Y1 KR2019910023727U KR910023727U KR960003376Y1 KR 960003376 Y1 KR960003376 Y1 KR 960003376Y1 KR 2019910023727 U KR2019910023727 U KR 2019910023727U KR 910023727 U KR910023727 U KR 910023727U KR 960003376 Y1 KR960003376 Y1 KR 960003376Y1
- Authority
- KR
- South Korea
- Prior art keywords
- audio
- terminal
- video
- pop noise
- power supply
- Prior art date
Links
Classifications
-
- 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
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
Abstract
내용 없음.No content.
Description
제1도는 TV의 오디오부의 회로도.1 is a circuit diagram of an audio portion of a TV.
제2도는 본 고안에 따른 팝 노이즈 제거회로가 구성된 TV의 오디오부의 회로도.2 is a circuit diagram of an audio unit of a TV configured with a pop noise removing circuit according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 마이콤 2 : 오디오 및 비디오부1: Micom 2: Audio and video section
3 : 푸쉬풀 증폭기 4 : 스피커3: push-pull amplifier 4: speaker
5 : 비디오 제어부5: video control unit
본 고안은 팝 노이즈(Pop Noise) 제거회로에 관한 것으로, 특히 TV의 전원 off시 팝 노이즈가 제거되도록 한 팝 노이즈 제거 회로에 관한 것이다. 일반적으로 TV의 전원 off시 오디오부의 부귀환(Negative Feed Back)단자에 접속된 캐패시터에 충전된 전하가 완전한 방전을 하지 못하고 오디오 푸쉬풀 증폭기 및 스피커를 통해 출력되어 팝 노이즈가 발생된다.The present invention relates to a pop noise removing circuit, and more particularly, to a pop noise removing circuit for removing pop noise when a TV is powered off. In general, when the TV is powered off, the charges charged to the capacitors connected to the negative feed back terminal of the audio unit do not completely discharge and are output through the audio push-pull amplifier and the speaker to generate pop noise.
따라서 본 고안은 TV의 전원 off시 상기 캐패시터에 충전된 전하가 방전할 수 있는 통로를 구성하여 상기한 단점이 해소될 수 있는 팝 노이즈 제거회로를 제공하는데 그 목적이 있다.Therefore, an object of the present invention is to provide a pop noise canceling circuit which can solve the above-mentioned disadvantages by configuring a passage through which a charge charged in the capacitor can discharge when the TV is powered off.
본 고안의 팝 노이즈 제거회로는 오디오 및 비디오부(2)의 SIF 입력단자 및 수평전압 입력단자(HORIZONTAL VCC)간에 다이오드를 접속시켜 TV의 전원 off시 오디오 출력부를 ＂0＂전위로 강하시켜 팝 노이즈가 제거되는 것을 특징으로 한다.The pop noise canceling circuit of the present invention connects a diode between the SIF input terminal and the horizontal voltage input terminal (HORIZONTAL VCC) of the audio and video unit 2 to lower the audio output unit to zero potential when the TV is powered off. Characterized in that is removed.
이하, 첨부된 도면을 참조하여 본 고안을 상세히 설명하기로 한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
제1도는 TV의 오디오부의 회로도로서, 마이콤(1)의 볼륨 출력 신호에 따라 트랜지스터(Q1)가 off동작하여 VCC1전원이 저항(R2) 및 (R3)을 통해 예를 들어 LA7680 IC로 구성되는 오디오 및 비디오부(2)의 SIF 입력단자에 공급된다.FIG. 1 is a circuit diagram of an audio unit of a TV, in which transistor Q 1 is turned off according to the volume output signal of the microcomputer 1 so that the VCC1 power supply is connected to, for example, the LA7680 IC through resistors R 2 and R 3 . It is supplied to the SIF input terminal of the audio and video part 2 which is comprised.
그러므로 상기 오디오 및 비디오부(2)의 오디오 출력단자로부터의 음성신호는 캐패시터(C2), 푸쉬풀 증폭기(3) 및 스피커(4)를 통해 출력되는데, 이때 상기 오디오 및 비디오부(2)의 부귀환 단자(NFB)로부터 저항(R5)을 통해 접속된 캐패시터(C1)에는 전하가 충전된 상태이다.Therefore, the audio signal from the audio output terminal of the audio and video unit 2 is output through the capacitor C 2 , the push-pull amplifier 3 and the speaker 4, wherein the audio and video unit 2 is output. The capacitor C 1 connected from the negative feedback terminal NFB through the resistor R 5 is charged.
한편, 상기 마이콤(1)의 파워(power)단자로부터 공급되는 제어 신호는 트랜지스터(Q2)를 ON시킨다.On the other hand, the control signal supplied from the power terminal of the microcomputer 1 turns on the transistor Q 2 .
트랜지스터(Q2)가 ON동작하면 트랜지스터(Q3)가 ON동작하여 VCC2 전원이 저항(R8) 및 트랜지스터(Q3)를 통하게 되는데, 캐패시터(C3)에 의해 평활되고 제너다이오드(ZD1)에 의해 일정전압으로 되어 상기 오디오 및 비디오부(2)의 수평전원단자(HOR VCC)에 공급된다.When the transistor Q 2 is turned ON, the transistor Q 3 is turned ON so that the VCC2 power supply passes through the resistor R 8 and the transistor Q 3 , which is smoothed by the capacitor C 3 and formed by the zener diode ZD 1. ) Is supplied to the horizontal power supply terminal HOR VCC of the audio and video unit 2 by a constant voltage.
그러므로 상기 오디오 및 비디오부(2)의 비디오 출력단자로부터의 출력신호가 비디오 제어부(5)에 인가된다.Therefore, the output signal from the video output terminal of the audio and video section 2 is applied to the video control section 5.
이러한 동작 상태에서 전원을 off시키면 상기 캐패시터(C1)에 충전된 전하는 상기 푸쉬풀 증폭기(3)에서 증폭되어 스피커(4)를 통해 출력되어 팝 노이즈를 발생시킨다.When the power is turned off in this operating state, the charge charged in the capacitor C 1 is amplified by the push-pull amplifier 3 and output through the speaker 4 to generate pop noise.
제2도는 본 고안에 따른 팝 노이즈 제거회로가 구성된 TV의 오디오부의 회로도로서, 전술한 제1도의 상태에서 상기 오디오 및 비디오부(2)의 SIF단자 및 수평전원단자(HOR VCC)간에 다이오드(D1)을 접속 구성한 회로도인데, TV의 전원 off시 상기 마이콤(1)의 파워단자에서 제일 먼저 LOW신호가 공급되므로 트랜지스터(Q2)가 off된다.FIG. 2 is a circuit diagram of an audio unit of a TV including a pop noise canceling circuit according to the present invention, wherein a diode D is connected between the SIF terminal and the horizontal power supply terminal HOR VCC of the audio and video unit 2 in the state of FIG. 1 ) is a circuit diagram in which the LOW signal is first supplied from the power terminal of the microcomputer 1 when the TV is powered off, so that the transistor Q 2 is turned off.
그러므로 트랜지스터(Q3)가 off되어 VCC2 전원이 차단된다.Therefore, transistor Q 3 is turned off to cut off the VCC2 power supply.
따라서 상기 오디오 및 비디오부(2)의 수평전원단자(HOR VCC)의 전위는 0전위가 되어 다이오드(D1)는 순방향 바이어스 상태가 되므로 상기 오디오 및 비디오부(2)의 부귀환(VFB)단자에 저항(R5)을 통해 접속된 캐패시터(C1)의 방전전압은 다이오드(D1) 및 상기 오디오 및 비디오부(2)의 수평전원단자(HOR VCC)를 통해 방전되므로 상기 푸쉬풀 증폭기(3)에는 어떠한 신호도 입력되지 않아 팝 노이즈가 제거된다.Therefore, since the potential of the horizontal power supply terminal HOR VCC of the audio and video unit 2 becomes zero potential and the diode D 1 is in a forward bias state, the negative feedback (VFB) terminal of the audio and video unit 2 is provided. The discharge voltage of the capacitor C 1 connected through the resistor R 5 is discharged through the diode D 1 and the horizontal power terminal HOR VCC of the audio and video unit 2, so that the push-pull amplifier ( No signal is input to 3) to eliminate pop noise.
상술한 바와 같이 본 고안에 의하면 TV의 전원 off시 발생하는 팝 노이즈를 효과적으로 제거할 수 있는 탁월한 효과가 있다.As described above, according to the present invention, there is an excellent effect of effectively removing pop noise generated when the TV is turned off.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910023727U KR960003376Y1 (en) | 1991-12-24 | 1991-12-24 | Pop noise removing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910023727U KR960003376Y1 (en) | 1991-12-24 | 1991-12-24 | Pop noise removing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR930017138U KR930017138U (en) | 1993-07-29 |
| KR960003376Y1 true KR960003376Y1 (en) | 1996-04-20 |
Family
ID=19325423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019910023727U KR960003376Y1 (en) | 1991-12-24 | 1991-12-24 | Pop noise removing circuit |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR960003376Y1 (en) |
-
1991
- 1991-12-24 KR KR2019910023727U patent/KR960003376Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR930017138U (en) | 1993-07-29 |
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