Microphone effect of variable capacitor
可变电容器微音效应
The tweeter emits the sound wave, then the capacitor microphone receives the echo.
其声波由电动扬声器发射，声波接收采用电容传声器。
Software realization automatic volume control strengthening electret capacitor microphone potency
软件实现自动音量控制强化驻极体电容器麦克风效能
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