本文对驻极体电容传声器的原理及噪声作了分析，这将有助于提高它的电特性。
The principle of electret condenser microphone and its noise are analyzed in the paper. It will be helpful to improve the electric specification.
该电路涉及到放大、滤波、电平抬升等电路，并给出了安全设计问题，利用驻极体电容传声器来拾取心音信号。
It also gives a safety design problem analysis using an electret capacitor microphone to pick-up the heart sound signals.
该电路涉及到放大、滤波、电平抬升等电路，并给出了安全设计问题，利用驻极体电容传声器来拾取心音信号。
It also gives a safety design problem analysis using an electret capacitor microphone to pick-up the heart sound signals.
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