公开(公告)号：US10284949B2

公开(公告)日：2019-05-07

申请号：US15625281

申请日：2017-06-16

Applicant: ZTE CORPORATION

Inventor： Feng Zhang ,  Wei Wang

IPC: H04R3/00 ,  G01H11/06 ,  H04R19/01 ,  H04R19/04 ,  H04R29/00 ,  H04R3/06

Abstract: An impedance matching method for an electret microphone is provided. In some embodiments, the impedance matching method includes collecting a bias voltage between a source and a drain of a field effect transistor built in the electret microphone; determining whether the bias voltage is within a preset bias voltage threshold range; and if it is detected that the bias voltage is not within the preset bias voltage threshold range, sending a corresponding control signal to adjust load bias impedance so that the bias voltage is within the preset voltage threshold. An impedance matching apparatus for an electret microphone and a communication device are also provided.