Method and device for automatically identifying microphone pin and ground pin of audio interface and electronic signature token

摘要

A method and a device for automatically identifying a microphone pin and a ground pin of an audio interface and an electronic signature token are provided. The method comprises: not implementing an identification operation on the first pin and the second pin of the audio interface when an absolute value of a voltage difference between the first pin and the second pin is less than a first threshold; and determining a type of each of the first pin and the second pin according to a sign of the voltage difference between the first pin and the second pin when the absolute value of the voltage difference is greater than or equal to a second threshold, in which the second threshold is greater than or equal to the first threshold.

主权项

1. A method for automatically identifying a microphone pin and a ground pin of an audio interface, wherein the audio interface comprises a first pin and a second pin, the first pin is one of the microphone pin and the ground pin of the audio interface, the second pin is the other one of the microphone pin and the ground pin of the audio interface, the audio interface is connected with a headphone jack of a mobile terminal, and the method comprises:
not implementing an identification operation on the first pin and the second pin of the audio interface if an absolute value of a voltage difference between the first pin and the second pin is less than a first threshold; determining a type of each of the first pin and the second pin according to a sign of the voltage difference between the first pin and the second pin if the absolute value of the voltage difference is greater than or equal to a second threshold, in which,
the second threshold is greater than or equal to the first threshold,if the absolute value of the voltage difference is greater than or equal to the second threshold and the voltage difference is positive, the first pin is determined as the microphone pin and the second pin is determined as the ground pin, andif the absolute value of the voltage difference is greater than or equal to the second threshold and the voltage difference is negative, the first pin is determined as the ground pin and the second pin is determined as the microphone pin.