Circuit that suppresses audio noise

Abstract

The invention discloses a circuit capable of inhibiting sound accompaniment noise, including a main processor and a sound accompaniment power amplifier. A first lead is arranged between a left channel output coupling end of the main processor and a left channel input positive end of the sound accompaniment power amplifier. One end, close to the sound accompaniment power amplifier, of the first lead is serially connected with a first capacitor. A second lead is arranged between a ground wire end A of the main processor and a left channel input negative end of the sound accompaniment power amplifier. One end, close to the sound accompaniment power amplifier, of the second lead is serially connected with a second capacitor. A third lead is arranged between a right channel output coupling end of the main processor and a right channel input positive end of the sound accompaniment power amplifier. One end, close to the sound accompaniment power amplifier, of the third lead is serially connected with a third capacitor. A fourth lead is arranged between a ground wire end B of the main processor and a right channel input negative end of the sound accompaniment power amplifier. One end, close to the sound accompaniment power amplifier, of the fourth lead is serially connected with a fourth capacitor. The invention solves the problem that the sound accompaniment background noise is loud in the electronic product, greatly reduces the design difficulty, and inhibits the sound accompaniment background noise level.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a circuit capable of suppressing sound noise. Background technique [0002] In current electronic products related to audio or audio and video, there is usually at least one main processor and one audio power amplifier integrated circuit. The main processor is responsible for the demodulation, decoding and processing of sound effects and volume of the source, and then sends the processed audio signal to the audio power amplifier circuit for amplification, and finally sends it to the speaker for sound. [0003] If the audio signal sent by the above-mentioned main processor to the audio power amplifier integrated circuit is not a digital signal such as I2S, but an analog signal, then the audio signal is very easy to introduce noise during the PCB routing process, and finally through the audio power amplification, it will appear on the speaker end. Severe background noise affects norm...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the noise introduction problem existing in electronic products with the functions of processing and amplifying analog audio signals, provide a circuit capable of suppressing sound noise, and solve the problem of large sound background noise in electronic products. It can not only greatly reduce the design difficulty, but also suppress the background noise level of the sound

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