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1. (WO2018133565) GAIN CONTROL DEVICE

Pub. No.:    WO/2018/133565    International Application No.:    PCT/CN2017/114585
Publication Date: Fri Jul 27 01:59:59 CEST 2018 International Filing Date: Wed Dec 06 00:59:59 CET 2017
IPC: H03G 3/20
Applicants: SHENZHEN ZYL SEMICONDUCTOR TECHNOLOGY CO., LTD
深圳市中移联半导体科技有限公司
Inventors: LIN, Qiliang
林其亮
WU, Shunda
吴顺达
Title: GAIN CONTROL DEVICE
Abstract:
The invention provides a gain control device comprising a pre-amplifier circuit, a voltage control circuit, a modulation circuit, an amplitude detection circuit, a zero-crossing circuit, a clip protection and amplitude detection circuit, and a gain control circuit. The pre-amplifier circuit, the voltage control circuit, and the modulation circuit are sequentially connected to each other. The voltage control circuit is connected to the gain control circuit via the amplitude detection circuit and the zero-crossing circuit, respectively. The modulation circuit is connected to the gain control circuit via the clip protection and amplitude detection circuit. The gain control device provided in the invention is utilized to provide favorable audio quality while providing protection for a speaker effectively, preventing the speaker from being damaged as a result of exceeding maximum power.