KR930022709A

KR930022709A - Automatic volume control circuit for external noise

Info

Publication number: KR930022709A
Application number: KR1019920006662A
Authority: KR
Inventors: 김선득
Original assignee: 배순훈; 대우전자 주식회사
Filing date: 1992-04-21
Publication date: 1993-11-24

Abstract

본발명은 오디오를 청취하고 있는 동안 외부소음으로 인해 심한 방해를 받는 경우에 있어 이를 자동으로 감지하여 원하는 신호음량을 조절하기 위한 외부소음에 대한 자동음량조절회로에 관한 것으로서 외부소음을 감지하기 위한 미이크(MIC)를 설치하여 여기서 감지된 신호(스피커에서 나오는 출력전기신호(So)와 순수스피커출력음 이외의 외부소음(N)의 합와 기기 내부의 스피커출력전기신호 (So)를 입력증폭회로 (1)에서 증폭하고 차동증폭회로 (2)에서 검출회로(5)의 순수스피커출력음 이외의 외부소음(N)만을 검출하여 정류회로(3)를 통해 필요한 크기로 증폭 및 직류전압으로 정류된후 전압이득조정회로(4)에 인가되어 상기 전압이득조정회로 (4)가 앰프(6)를 거쳐 스피커 (7) 출력음을 자동으로 조절하여 별도의 볼륨조절 없이도 일정수준 이상의 스피커출력신호대 외부소음비를 갖는 음을 청취할 수 있는 유용한 발명이다.The present invention relates to an automatic volume control circuit for external noise to automatically detect the case of severe interference caused by external noise while listening to audio and to adjust the desired signal volume. Install an MIC and input the signal detected here (the sum of the output electrical signal (So) from the speaker and the external noise (N) other than the pure speaker output sound) and the speaker output electrical signal (So) inside the unit. After amplification at 1), the differential amplifier circuit (2) detects only external noise (N) other than the pure loudspeaker output sound of the detection circuit (5), and rectifies it to the required magnitude through the rectifier circuit (3) and rectified to DC voltage. The voltage gain adjusting circuit 4 is applied to the voltage gain adjusting circuit 4 to automatically adjust the output sound of the speaker 7 through the amplifier 6 so that a speaker having a predetermined level or higher without a separate volume control. It is a useful invention that can listen to sound having an output signal to external noise ratio.

Description

Automatic volume control circuit for external noise

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본발명의 블럭도.1 is a block diagram of the present invention.

제2도는 본발명의 회로도.2 is a circuit diagram of the present invention.

Claims

The input amplifier circuit 1 detects and amplifies external noise N other than the speaker output electrical signal So and the pure speaker output sound from the microphone MIC, and the speaker output electrical signal So detected by the detection circuit 5. ) To amplify the differential amplifier circuit 2 so that only the external noise N other than the pure loudspeaker output sound is amplified by the rectifier circuit 3 to the required magnitude and the voltage gain of the voltage gain adjusting circuit 4 is adjusted. The external noise is rectified to a DC voltage value (NDC) so that the voltage gain adjusting circuit 4 can automatically and automatically adjust the output sound of the speaker 7 through the amplifier 6. Daeha automatic volume control circuit.

2. The automatic volume control circuit according to claim 1, wherein the input amplifier circuit (1) is composed of a capacitor (C₁), a transistor (Q2), and a resistor (R₁-R2).

A resistor (R ₂₆ ) (R ₂₁ ) in a differential amplification circuit (2) comprising a transistor (Q₂-Q₄) and a resistor (R₄-R ₁₁ ) and a capacitor (C₂) (C ₃ ) (C ₅ ). And amplifying the output electrical signal (So) to be detected by the detection circuit (5) consisting of a) and a condenser (C ₁₀ ).

The rectifier circuit (3) according to claim 1, wherein the rectifier circuit (3) is used as a capacitor (C ₄ ) (C ₆ ) (C ₇ ) and a transistor (Q ₅ ) and a resistor (R ₁₂ -R ₁₅ ) diode (D ₁ ) (D ₂ ). Automatic volume control circuit for external noise, characterized in that configured.

The method of claim 1, wherein the transistor (Q _6), (Q ₇₎ and a resistor (R ₁₆ -R ₁₉₎ and said configuration in which the capacitor (C ₈₎ (C ₉₎ interconnected by the voltage gain control circuit 4, the Automatic volume control circuit for external noise.

※ Note: The disclosure is based on the initial application.