小波变换方法去除体表子宫电信号中母体心电干扰

Rejection of the Maternal ECG in the EHG Signal by Wavelet Transform

母体心电干扰严重影响了EHG信号的质量.为了解决以往算法中不能有效区分MECG干扰和EHG信号的问题,利用MECG干扰的波形特点,采用了基于小波变换的奇点检测以及模型极大值信号重建的方法去除EHG信号中的MECG干扰.该方法对EHG信号无影响,经临床实验取得了很好的去噪效果.该算法计算简单,可以实现EHG信号的实时处理,该研究的结果还可以用于被ECG信号污染的其它生理电信号的去噪.

Maternal ECG (MECG) interference seriously affects the quality of electrohysterogram (EHG) signal.To resolve this problem that the original methods can′t efficiently distinguish MECG interference from EHG signal,this paper applies the method based on the singularity check of wavelet transform and the signal reconstruction of modulus maxima to remove the MECG interference in EHG signal, by using wave characteristics of MECG interference.This method has no effect on EHG signal,and acquires better effect to remove noise after being validated by clinical experiment.It is easy to calculate and may carry out real-time disposal of EHG signal.The result may also be used to remove other physiology signals polluted by ECG signal.