This paper presents the methods for the heart sound acquisition used electret microphone,including the heart sound extraction project,principle,rules and the impedance conversion of microphone.是什么意思_This paper presents the methods for the heart sound acquisition used electret microphone,including the heart sound extraction project,principle,rules and the impedance conversion of microphone.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句