The efficient extraction of the heart sound envelope can significantly facilitate detecting S1, S2, separating murmurs and therefore determining the severity of cardiac disease.
有效提取心音包络对于检测s1、S2，分离杂音进而判断心脏病类型和严重程度具有重要意义。
Method: to use Model HKY06A heart vibration sensor for the detection of the heart sound, and to form the heart sound envelope with two way hardware rectification and low frequency passed filter.
方法：使用HKY06 A心音传感器提取心音信号，使用双向检波及低通滤波实现心音包络的提取。
The envelope of sound spectrum is related to the transfer function of bore.
声频谱包络的特点和音管的传递函数有相应的关系。
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