Polarity-reversal self-adapting circuit of four-segment audio interface

Abstract

The invention relates to a polarity-reversal self-adapting circuit of a four-segment audio interface. The polarity-reversal self-adapting circuit comprises a self-adapting circuit installed in electronic equipment with a four-segment earphone plug. The polarity reversal self-adapting circuit is characterized by comprising a ground signal self-adapting module and a microphone signal self-adapting module, and is capable of automatically adjusting the polarities of microphone signals and ground signals at an equipment end according to the types of inserted earphone interfaces so as to adapt to different mobile phone earphone interfaces when the circuit is inserted in the mobile phone earphone interfaces. The polarity-reversal self-adapting circuit provided by the invention is simple in structure and convenient to manufacture, is capable of efficiently and correctly inputting interface signals of earphones under different standard conditions to abutted equipment so as to meet the demands of different equipment, and can reduce extra waste and solve the problems of incompatibility of equipment, etc.

Description

Technical field [0001] The invention relates to the field of data communication with four-section audio ports and power-taking through the four-section audio ports, in particular to a method for self-adaptive polarity reversal when data communication and power-taking through the audio port of a mobile phone. . Background technique [0002] The four 3.5mm headphone sockets are often used in mobile phones and other devices. Compared with the traditional 3-pin sockets, the microphone signal is increased. However, there are two different standards in the definition of the position of the microphone pin, namely the Open Mobile Terminal Platform (OMTP, Open Mobile Terminal Platform) standard and the North American common standard. These two standards have the same definition of the first pin and the second pin of the plug, but the third pin and the fourth pin have the opposite definition of the microphone and ground. The OMTP standard states that the third pin is the microphone. The ...

AI Technical Summary

Problems solved by technology

[0003] In the design of the external device of the earphone port of the traditional mobile phone, the polarity of the microphone and the ground is not judged, which will lead to the problem that the external device of the earphone port of the mobile phone that conforms to the OMTP standard cannot work normally when connected to the earphone port of the mobile phone standard commonly used in North America.

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