US 11,729,566 B2
Judging circuit for positive and negative terminals of mic of earphone and method thereof, and eletronic device
Hongxia Tao, Shanghai (CN)
Assigned to SHANGHAI YAOHUO MICROELECTRONICS CO., LTD., Shanghai (CN)
Appl. No. 17/284,458
Filed by SHANGHAI YAOHUO MICROELECTRONICS Co., Ltd., Shanghai (CN)
PCT Filed Mar. 4, 2020, PCT No. PCT/CN2020/077832
§ 371(c)(1), (2) Date Apr. 10, 2021,
PCT Pub. No. WO2020/192376, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 201910239003.3 (CN), filed on Mar. 27, 2019.
Prior Publication US 2022/0007122 A1, Jan. 6, 2022
Int. Cl. H04R 5/04 (2006.01); H04R 1/10 (2006.01); H04R 29/00 (2006.01)
CPC H04R 29/001 (2013.01) [H04R 1/1041 (2013.01); H04R 5/04 (2013.01); H04R 2420/05 (2013.01)] 20 Claims
OG exemplary drawing
 
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.