Circuit for eliminating impact sound generated in switching process

Abstract

The invention discloses a circuit for eliminating impact sounds generated in switching process. The circuit comprises a power supply and an audio power amplifier. A switch voltage generation circuit is connected with the power supply, and the switch voltage generation circuit is connected with a turn-on response switch circuit and a turn-off response switch circuit; the switch voltage generation circuit provides a switch voltage signal to control the turn-on response switch circuit and the turn-off response switch circuit; and the output terminals of the turn-on response switch circuit and the turn-off response switch circuit are connected with the audio power amplifier so as to provide a silencing signal for the audio power amplifier during the turn-on and turn-off moment. The switch voltage generation circuit outputs a switch voltage signal U1 to control the turn-on response switch circuit and the turn-off response switch circuit, thus outputting effective silencing signal MUTE, and eliminating the impact sounds during the turn-on and turn-off process. The circuit can effectively and reliably eliminate the impact sounds of the audio equipment in the turn-on and turn-off process, has low cost, and is simple, reasonable, safe and reliable.

Description

【Technical field】 [0001] The invention relates to the technical field of audio equipment products, in particular to a circuit for eliminating the impact sound of switching on and off the audio equipment. 【Background technique】 [0002] For audio equipment such as televisions, DVDs, and stereos, the sound system generally inputs small audio signals into the audio power amplifier circuit, and then outputs them to the speaker after being processed and amplified by the audio power amplifier circuit, and the speaker emits sound. The audio power amplifier circuit of audio equipment is very important to the sound system, and the design of the audio power amplifier circuit often affects the effect of the TV sound system. When the audio equipment is turned on and off, due to the coupling effect of the internal capacitance and inductance of the audio power amplifier, irregular audio signals are easily output to the speaker, resulting in an impact sound. In order to eliminate the impa...

AI Technical Summary

Problems solved by technology

In order to eliminate the impact sound generated by the audio equipment at the moment of power-on and power-off, audio equipment generally adopts the method of making the audio power amplifier in the mute state at the moment of power-on and power-off, but the current circuit for realizing this method has complex circuit structure, high cost, and There will be a large current pulse at the moment of turning on and off, and there are certain hidden dangers in reliability

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