CPC H04R 29/001 (2013.01) [H04R 1/1041 (2013.01); H04R 5/04 (2013.01); H04R 2420/05 (2013.01)] | 20 Claims |
20. A judging method for positive and negative terminals of an earphone MIC of a Type-C earphone, wherein a negative terminal of the MIC is connected to a common terminal of two speaker circuits, the judging method for positive and negative terminals of an earphone MIC comprising:
controlling any one first terminal of the two terminals of the MIC to inject an excitation current, and controlling the other second terminal of the two terminals of the MIC to be connected to the ground;
collecting a current voltage of a corresponding position in at least one of the speaker circuits;
comparing the current voltage with a preset reference voltage value;
determining that the first terminal is the negative terminal of the MIC and the second terminal is the positive terminal of the MIC if the current voltage is higher than the preset reference voltage value; and
determining that the first terminal is the positive terminal of the MIC and the second terminal is the negative terminal of the MIC if the current voltage is lower than the preset reference voltage value.
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