HHT滤波特性在sEMG信号滤波中的应用

摘要

在常规HHT滤波方法基础上,考虑sEMG信号频带分布特性,设计了一种新的HHT滤波方法.该方法设计了针对IMF分量的噪声能量抑制函数,用来抑制各分量可能包含的噪声,再将每个修正的IMF分量叠加,得到去噪后的sEMG信号.通过实验比较可以看出,考虑sEMG信号频带分布特性的HHT滤波方法可以一定程度上解决噪声与信号处于同一IMF上的情形,获得比常规HHT滤波方法更好的效果.%Conventional HHT filtering method is introduced briefly. Considering the deficiency of the conventional HHT filter and frequency distribution of sEMC signal, a noise suppression function is designed to suppress the noise contained in every IMF. Furthermore, by adding all revised IMF together, the filtered sEMG signal is gained. The experiments show that the method can achieve a satisfactory effect.