Signal input circuit

Abstract

The invention discloses a signal input circuit. The signal input circuit comprises an MIC socket and an audio processing chip; the MIC socket comprises a first MCI input end and a second MIC input end; the signal input circuit further comprises a first bias circuit which is respectively connected with the first MCI input end and the audio processing chip; a second bias circuit which is respectively connected with the second MIC input end and the audio processing chip; and a matching circuit which is coupled between the first bias circuit, the second bias circuit and the audio processing chip;the first bias circuit and the second bias circuit are used for performing differential treatment on a received MIC signal, inputting two processed differential signals to the matching circuit in a differential input mode, and outputting the differential signals after being subjected to differential mode matching of the matching circuit to the audio processing chip, so that the audio processing chip outputs an audio signal at an output end after processing the MIC signal, and drives a load connected with the output end of an audio processor to play the audio signal. The signal input circuit provided by the invention solves the problem of unstable input of the existing MIC signal.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a signal input circuit. Background technique [0002] With the development of the times and the continuous improvement of people's living standards, chips are used more and more frequently. Chips refer to silicon chips containing integrated circuits. They are small in size and are often part of computers or other electronic devices. Chips are also called Microcircuits, microchips and integrated circuits, the types of chips are very wide, and the use of audio processing chips is particularly frequent. The audio processing chip is used to process the audio signal received by the MIC and then output it. [0003] At present, the MIC plug transmits the acquired audio signal to the audio processing chip, which can be divided into single-ended input mode and double-ended input mode. Among them, the MIC plug with single-ended input mode mainly includes two lines, one of which...

AI Technical Summary

Problems solved by technology

[0005] Based on this, the purpose of the present invention is to propose a signal input circuit to solve the problem of unstable input of existing MIC signals

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