公开(公告)号：US20230237985A1

公开(公告)日：2023-07-27

申请号：US17583235

申请日：2022-01-25

Applicant: ELITE SEMICONDUCTOR MICROELECTRONICS TECHNOLOGY INC.

Inventor： HSIN-YUAN CHIU ,  HSIANG-YU YANG ,  YA-MIEN HSU

IPC: G10K11/178 ,  H03G3/00

CPC classification number: G10K11/17813 ,  H03G3/001

Abstract: An apparatus for noise reduction in audio signal processing includes a power amplifier, a zero-crossing detector, and a threshold detector. The power amplifier has an input signal terminal for receiving an audio input signal and an output signal terminal. The audio input signal is a digital-to-analog converted version according to a version of a digital audio signal. The power amplifier has an analog gain which is controllable in response to an analog gain control signal. The zero-crossing detector determines a zero-crossing detection signal according to an internal signal provided between the input signal terminal and the output signal terminal. The threshold detector determines a gain setting according to the digital audio signal and the zero-crossing detection signal to generate the analog gain control signal indicating the gain setting, wherein the threshold detector controls the analog gain of the power amplifier according to the analog gain control signal.