Microphone and operation method of audio input interface adaptive circuit

Abstract

The invention discloses a microphone and an operation method of an audio input interface self-adaptive circuit, and belongs to the technical field of audio and microphone input interfaces. The interface module is connected with the plug; a first terminal and a fourth terminal of the interface module are connected with a positive electrode of an electret bias power supply in the bias power supply module; the electret bias power supply applies bias voltage to the first terminal and the fourth terminal so as to generate logic control level. The logic control level controls the voltage filtering module to filter out audio alternating current signals, the signal is input into a logic control pin of the dual four-to-one CMOS analog switch chip of the integrated circuit module; and the dual four-to-one CMOS analog switch chip of the integrated circuit module performs identification and judgment on signals received by the logic control pins and then controls the switching of the four groups ofIN pins according to the signals so as to perform self-adaption of the microphone and the audio input interface.

Description

technical field [0001] The invention belongs to the technical field of audio and microphone input interfaces, and in particular relates to an operation method for an adaptive circuit of a microphone and an audio input interface. Background technique [0002] Many audio (audio) products, especially portable audio products, have audio input interfaces, including electret microphone input interfaces, stereo audio signal input interfaces, and the microphone on the phone's talkable headset is also an electret microphone input. interface. These interfaces are connected with 3.5mm plugs, which correspond to 3.5mm headphone jacks. Portable products are often difficult to be equipped with multiple interfaces at the same time due to structural size limitations, so the multiplexing of input interfaces is a more reasonable solution. [0003] The traditional headphone jack is used as the output interface, and adaptive multiplexing is also adopted. Use different impedance changes of di...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high processing cost and poor applicability of the existing adaptive earphone through the programmable control chip

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