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。
Musicians wanting to push the envelope of conventional sound formed groups that prominently (and sometimes exclusively) featured the 'new wave' of synthetic sound.
音乐家们想让这个信封常规的声音形成的团体，突出(有时只)“新浪潮”合成的声音。
Methods: withdraw the envelope of heat sounds by using Mathematic Morphology and normalized Shannon energy, extract first heart sound and the second heart sound.
利用数学形态学和归一化香农能量两种方法分别提取了心音的包络，突出了第一心音、第二心音等特征。
Methods: withdraw the envelope of heat sounds by using Mathematic Morphology and normalized Shannon energy, extract first heart sound and the second heart sound.
利用数学形态学和归一化香农能量两种方法分别提取了心音的包络，突出了第一心音、第二心音等特征。
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