平移不变小波去噪法在胎儿心率提取中的应用

Extracting of the Fetal Heart Rate Signal Based on Translation Invariant Wavelet De-Nosing

用传统的小波阈值法对超声多普勒胎儿心脏回波信号进行去噪处理时会产生Psuedo-Gibbs现象,影响了去噪效果和胎儿心率值的提取。为了解决这个问题,在此基础上提出了平移不变小波法去噪。实验结果表明,该方法有效的抑制了Psuedo-Gibbs现象,剔除了信号中的噪声,识别出被噪声淹没的有用信号,有利于心率值的提取。

The traditional wavelet thresholding de-noising method in the treatment of the ultrasound doppler fetal heart echo signals may cause the Psuedo-Gibbs phenomenon, which influence the effects of de-noising and the fetal heart rate＇s extracting. In order to solve this problem, a translation invariant wavelet de-noising method is proposed. Experiment results show that this method can effectively suppress the Pseudo-Gibbs phenomenon, eliminate noise in signals.