... PCGacceleratedtypetransducer心音加速换能器 PCGmicrophone心音传声器，心音图扩音器 PCO2partialpressureofcarbondioxide二氧化碳分压 ...
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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.
临床实验表明，利用驻极体传声器基本上能采集到正常的第一、第二心音，但对有病理信息的第三、第四心音却不易正确采集到，这与患者性别和胖、瘦等因素均有关系。
The clinical experiments have indicated that the first and second heart sound can be almost acquired by the microphone, but it is difficult for the third and fourth, w…
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