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1. (WO2018133155) AUDIO OUTPUT CIRCUIT, AND AUDIO APPARATUS

Pub. No.:    WO/2018/133155    International Application No.:    PCT/CN2017/074158
Publication Date: Fri Jul 27 01:59:59 CEST 2018 International Filing Date: Tue Feb 21 00:59:59 CET 2017
IPC: H04R 3/00
Applicants: SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.
深圳市华星光电技术有限公司
Inventors: LI, Wendong
李文东
Title: AUDIO OUTPUT CIRCUIT, AND AUDIO APPARATUS
Abstract:
An audio output circuit (100), comprising an audio power amplifier (110), a mute control circuit (130), and a microcontroller (150). The audio power amplifier (110) comprises a power source input end (VCC), a mute control end (/SD), and an audio signal output end (Out). The power source input end (VCC) is used to be connected to a power source (AMP_VCC) to obtain a power source voltage. The mute control end (/SD) is connected to the microcontroller (150) via the mute control circuit (130), and connected to the ground via a pull-down resistor (R0). The audio signal output end (Out) is used to output an audio signal. The mute control circuit (13) is further connected to the power source (AMP_VCC) to disconnect, when the power source voltage is smaller than a predetermined voltage, the mute control end (/SD) from the microcontroller (150). Also provided is an audio apparatus. The circuit effectively prevents a popping sound of a speaker of the audio apparatus.