A frequency domain Hampel filter for blind rejection of sinusoidal interference from electromyograms
A frequency domain Hampel filter for blind rejection of sinusoidal interference from electromyograms
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DOI：
10.1016/j.jneumeth.2008.10.019
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发表时间：
2009-03-15
影响因子：
3
通讯作者：
Allen, David P.
中科院分区：
文献类型：
--
作者：
Allen, David P.
本文提出了一种从肌电信号中滤除工频干扰和其它正弦干扰的频域滤波方法。这种干扰的存在导致复值快速傅里叶变换中的尖峰，其可以被认为是异常值。该滤波器使用离群鲁棒的Hampel标识符来检测尖峰，并将其替换为局部值的中值。滤波器的性能进行了测试，使用一组模拟肌电图和实验数据。结果表明，该滤波器比多重陷波滤波和频谱插值滤波具有更好的抗干扰性能。使用这种方法的主要优点是，干扰发生的频率不需要事先知道，并且在没有干扰的情况下信号不会失真。在模拟和实验数据中加入单频干扰的情况下，
A frequency domain filtering method is presented for the removal of power-line and other sinusoidal interference from electromyograms. The presence of such interference results in spikes in the complex-valued fast Fourier transform which can be considered to be outliers. The filter uses the outlier-robust Hampel identifier to detect spikes and replaces them with the median value of local values. The performance of the filter was tested using a set of simulated electromyograms and on experimental data. It was shown that the filter is more effective at rejecting interference than multiple notch filtering and spectral interpolation. The main advantages of using this method are that the frequencies at which the interference occurs need not be known a priori and that signals are not distorted in the absence of interference. In the case of single-frequency interference added to simulated and experimental data, errors in root-mean-squared amplitude and median frequency of