KR970004383A

KR970004383A - Car Audio's Off-Pop Noise Reduction Circuit

Info

Publication number: KR970004383A
Application number: KR1019950017982A
Authority: KR
Inventors: 조영식
Original assignee: 김주용; 현대전자산업 주식회사
Priority date: 1995-06-29
Filing date: 1995-06-29
Publication date: 1997-01-29

Abstract

본 발명은 전자동조방식을 채택하는 카오디오에서 세트를 온,오프할때 발생되는 전원의 유입 또는 유출에 의한 과도적 특성으로 기인하는 불필요한 잡음이 스피커로 출력되는 것을 방지하기 위한 카오디오의 오프-팝 노이즈 제거회로에 관한 것이다.The present invention is to turn off the audio of the audio to prevent the unnecessary noise caused by the transient characteristics due to the inflow or outflow of the power generated when the set is turned on or off in the car audio adopting the automatic tuning method. It relates to a pop noise canceling circuit.

본 발명은 카오디오장치로부터 입력되는 음성신호를 증폭하여 스피키로 출력하는 버퍼증폭기(10) 및 파워증폭기(20)와, 파워증폭기(20)의 입력단에 출력단이 연결되어 뮤트신호를 출력하는 뮤트구동회로(30)와, 상기 뮤트구동회로(30)의 입력단에 출력단이 접속되는 마이컴(40)으로 구성되는 카오디오 제어회로에 있어서, 세트가 오프될 대 변화되는 배터리의 전원을 감지하여 일정한 뮤트신호를 발생하여 상기 뮤트구동회로(30)의 입력단에 인가되는 펄스발생회로(50)를 더 포함하여 구성된 것이다.According to the present invention, a mute driving circuit for outputting a mute signal by connecting an output terminal to an input terminal of a buffer amplifier 10 and a power amplifier 20 and a power amplifier 20 for amplifying a voice signal input from a car audio device and outputting it as a speech signal In a car audio control circuit including a furnace 30 and a microcomputer 40 having an output terminal connected to an input terminal of the mute driving circuit 30, a constant mute signal is sensed by detecting a power of a battery that is changed when the set is turned off. It further comprises a pulse generating circuit 50 is applied to the input terminal of the mute driving circuit 30 by generating a.

따라서, 본 발명은 카도이도를 온,오프할때 발생하는 팝-노이즈를 제거하여 소비자의 클래임을 방지한 유용한 효과가 있다.Therefore, the present invention has a useful effect of preventing the consumer's claims by removing the pop-noise generated when the cardiodo on, off.

Description

Car Audio's Off-Pop Noise Reduction Circuit

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

제1도는 본 발명에 따른 회로 블럭도, 제2도는 제1도의 펄스발생회로의 상세회로도.1 is a circuit block diagram according to the present invention, and FIG. 2 is a detailed circuit diagram of the pulse generating circuit of FIG.

Claims

A buffer amplifier (10) and a power amplifier (20) for amplifying a voice signal input from a car audio device and outputting the speech signal; A mute driver circuit 30 connected to an input terminal of the power amplifier 20 to output a mute signal; And a microcomputer 40 having an output terminal connected to an input terminal of the mute driving circuit 30, the car audio control circuit configured to sense a power of a battery that is changed when the set is turned off and generate a constant mute signal to generate the mute signal. A car audio off-pop noise canceling circuit, characterized in that it further comprises a pulse generating circuit (50) applied to the input of the drive circuit (30).

According to claim 1, The pulse generating circuit 50 is applied to the base of the transistor (Q1) through the resistor (R1) at the same time the backup power supply (B +) is applied to the microcomputer 40 through the diode (D1), A battery power source (ACC B +) is connected to the base of the transistor (Q1) via a capacitor (C1) through the other end of the resistor (R2), one end is grounded through the diode (D2), the collector output of the transistor (Q1) Car audio off-pop noise cancellation circuit, characterized in that configured to be applied to the mute driving circuit (30) through the resistor (R3) and diode (D3).

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