自适应阈值小波滤波及其在ECG消噪中的应用

采集的心电信号,各类噪声往往覆盖了其有用信号的全频段范围,通常的方法难以有效消噪。讨论了将非线性阈值函数h引入小波消噪中,通过训练信号来确定各尺度下的h函数参数,然后采用阈值自适应的小波滤波进行心电信号消噪的方法。通过和Donoho的小波阈值消噪法对实测心电信号消噪比较,说明了该方法在心电消噪方面的有效性,且在消噪后波形不失真方面具有更好的优越性。

Adaptive threshold filter based on wavelet and its application in ECG de-noising

For the sampled electrocardiogram(ECG) signal,the varied noises often overlay the all frequency field of ECG.It is difficult to use the normal method to de-noising.In this article a non-line threshold filtering function h is introduced.The parameters of the h function in different wavelet scales is determined based on training signals,and then using the adaptive threshold filtering wavelet method to de-noising the ECG signal.Compared with the wavelet threshold de-noising algorithm,this method is validity in ECD de-nosing,and it has more advantages in keeping the ECG shape after de-noising.