Audio signal adapter device, interface detecting system of the same and electronic signature token

摘要

An audio signal adapter device detects whether a sequence of a microphone pin and a ground pin of an apparatus with an audio plug matches a detecting device into which the audio plug is inverted. The device includes a first interface having an audio signal receiving pin, a microphone pin and a ground pin, and a second interface having an audio signal output pin. An audio signal amplifying circuit is configured to amplify an audio signal received by the audio signal receiving pin and to output the amplified audio signal to the audio signal output pin. The audio signal received by the audio signal receiving pin flows to the microphone pin or ground pin via an impedance equivalent part of an audio signal amplifying circuit. The impedance circuit is coupled between the microphone pin and ground pin. An interface detecting system and an electronic signature token are also provided.

主权项

1. An audio signal adapter device, comprising: a first interface, a second interface, an audio signal amplifying circuit and an impedance circuit, wherein
the first interface comprises an audio signal receiving pin, a microphone pin and a ground pin, the second interface comprises an audio signal output pin, the audio signal amplifying circuit is configured to amplify an audio signal received by the audio signal receiving pin and to output the amplified audio signal to the audio signal output pin; the audio signal received by the audio signal receiving pin flows to the microphone pin or the ground pin via an impedance equivalent part of the audio signal amplifying circuit; and the impedance circuit is coupled between the microphone pin and the ground pin.