Patent · US Active

Pop sound suppression method, audio output circuit, and terminal

US10893360B2 · kind B2 · utility

0Cited by

1References

20Claims

0Family size

Assignee

Huawei Technologies Co., Ltd. · CN

Inventors

Ding Li · Superior, US
Shuai Du · Shanghai, CN
Jun Li · Shanghai, CN
Deyang Yin · Nanhu, CN

Key dates

Filing date	Oct 14, 2019
Grant date	Jan 12, 2021
Priority date	—
Expiry date	Oct 14, 2039

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02D30/70
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A pop sound suppression method, an audio output circuit, and a terminal suppress a pop sound that is generated when an audio output circuit is in an alternating current (AC) coupling structure. The output circuit includes an output power amplifier, a common-mode voltage buffer, a reference voltage generation circuit, a powered-on pop sound suppression switch, and a common-mode switch. The powered-on pop sound suppression switch is configured to control, in a power-on process of the audio output circuit, a voltage level of an output node to be zero. The common-mode switch is configured to control, when a reference voltage level of the reference voltage generation circuit is zero, the voltage level of the output node to be equal to the reference level.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.