一种基于小波变换的心音激励源位置的检测

心音信号是心脏系统疾病诊断的一个重要的生理信号，本文在分析心音产生物理机制的基础之上，建立了准周期心音激励模型，并将时间局部定位性好，计算快速的小波变换方法引入到对心音信号的处理，能够很好地检测出瓣膜关闭这一突变信号发生的时刻，并将其作为心音信号的划分标准，这一方法还具有很好的抗噪性。

Application of the wavelet transform on picking up the agitating source positions of heart sound signals

Heart sound signals are a kind of physiology signals which are very important in the diagnosis of many heart diseases. In this paper, based on the generation mechanism of heart sound signals, a paraperiodical agitating model of heart sound signals is created. And the wavelet transform method is applied on the processing of the heart sound signals.This method can pick up the valve's closing time position accurately,so it gives a criteria to separate the heart signals.The wavelet transform method not only has the feature of good time local location, high calculation efficiency,it is also robust to noise.