小波变换模极大值算法用于胎儿心电信号提取的研究

目的：研究采用小波变换模极大值算法如何从母体腹部信号中提取出胎儿心电信号。方法：根据母体腹部信号中母体心电和胎儿心电在小波变换下具有的不同特性,首先对母体腹部信号进行小波分解及模极大值检测,对检测结果进行处理,抑制某些与胎儿心电相关的极大值点而去除相应的信号奇异性,然后采用Mallat交替投影法使用处理后模极大值重构小波系数,进而重构信号,识别出母体腹部信号中的母体心电信号和胎儿心电信号。结果：使用临床数据对该方法进行测试,结果表明,基于单通道信号的小波变换模极大值算法能够识别母体腹部信号中的胎儿心电信号。结论：同时与传统的基于多通道信号的提取方法相比,不存在多通道信号相关性对提取结果的影响,但是该方法也存在一些不足之处,有待于进一步研究。

Study of Fetal ECG Extraction Based on Algorithm of Wavelet Transform Modulus Maximum

Objective This study is based on wavelet transform modulus maximum algorithm for extracting fetal ECG.Methods Maternal ECG and fetal ECG have different characteristics in the wavelet transform.First,the wavelet decomposition and modulus maximum detection was applied to the maternal abdominal signal.Detection results were processed to inhibit some of the maximum points associated with the fetal ECG and remove the corresponding signal singularity.The wavelet coefficients were reconstructed from the processed ...