This paper is concerned with an effort to address the strong interference of power frequency electrical signals in the process of EMG signal acquisition.The research building on the frequency spectrum analysis of the power frequency interference involves establishing a multiplicative relationship between the EMG signal and the power frequency interference;applying a homomorphic adaptive filtering method for homomorphic transformation of EMG signal;transforming the multiplicative relationship between the objective EMG signal and the harmonic frequency and its harmonic interference in the observed EMG signal into an additive relationship and thereby filtering out the interference of power frequency noise and harmonic using the adaptive filtering.The research shows that the homomorphic adaptive filtering capable of effectively eliminating the strong power frequency electrical interference in the process of EMG signal acquisition provides a better protection of EMG signal and demonstrates a proven effectiveness through experiments.%针对肌电信号采集过程中工频电的强干扰问题,对工频电干扰进行频谱分析,得到肌电信号与工频干扰间是乘性关系.采用同态自适应滤波方法对肌电信号进行同态变换,将目标肌电信号与工频电及其谐波干扰间的乘性关系转化为加性关系,从而利用加性自适应滤波滤出工频噪声及其谐波的干扰.结果表明:同态自适应滤波能够有效消除肌电信号采集中的强工频电干扰,同时较好地保护肌电信号,并通过实验验证了该方法的有效性.
展开▼
