香农能量算法用于提取心音信号的包络。同时还有一个用来对信号进行训练用的程序，主要是提取信号的特征值，以实现信号的分类识别-Shannon energy algorithm is used to extract the heart sound signal envelope. As well as a training signal is used for the procedure used mainly to extract the value of the signal characteristics in order to achieve signal classification and recognition