Turn-on muting control circuit of sound equipment

Abstract

The invention discloses a turn-on muting control circuit of sound equipment. The circuit comprises an electrifying impulse generating circuit, a switching circuit, and a muting control level supplying circuit, wherein the electrifying impulse generating circuit takes electrifying of a power supply as a triggering condition, and generating a control impulse through a charging process of the circuit; the switching circuit is controlled by a control impulse to turn on or turn off a switching element in the switching circuit; the muting control level supplying circuit supplies a muting control level matched with controlled equipment; the electrifying impulse generating circuit, the switching circuit, and the muting control level supplying circuit are sequentially connected between the power supply and the controlled equipment in series; the control pulse generated when the electrifying impulse generating circuit is electrified is transmitted to the switching circuit; and the switching circuit turns on the switching element in the switching circuit in the presence of the control pulse, so the muting control level supplying circuit outputs the muting control level to the controlled equipment. The turn-on muting control circuit of the sound equipment can effectively keep the controlled equipment in a mute state when the power supply is electrified, and eliminate an abnormal sound during the starting up process.

Description

technical field [0001] The invention relates to audio equipment, in particular to an audio startup mute control circuit. Background technique [0002] At present, the power supply of our audio equipment is powered on relatively quickly, otherwise it is easy to produce power-on sound, such as a "porphyll" sound when it is turned on. To solve this problem, the usual practice is to put the mute pin of the power amplifier in the mute state when it is powered on through the mute control I / O port, so as to eliminate the power-on sound. However, some power amplifiers have three states of ON, MUTE, and STANDBY, and they will still produce sound when they are in the mute state when powered on. There are also some software whose initialization time is too long and the I / O port control is complicated, and there will still be abnormal noises when starting up. Contents of the invention [0003] The purpose of the present invention is to overcome the problems existing in the above-men...

AI Technical Summary

Problems solved by technology

However, some power amplifiers have three states of ON, MUTE, and STANDBY, and they will still produce sound when they are in the mute state when they are powered on.

There are also some software whose initialization time is too long and the I / O port control is complicated, and there will still be abnormal noises when starting up

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