In allusion to the defects of surface electromyography signals (SEMG) extraction currently caused by serious (electromyography signals) EMG distortion when we put the severe force to the SEMG extraction, this paper presents a envelope filtering method based on the shape of the SEMG contour curve and processes a frequency analysis to it. This method can not be influenced by the muscle contraction force and can restrain the distraction of power frequency electric and its overtone, then extracts the EMG effectively as well as decides the status of contraction and relaxation force of the corresponding muscles and the contraction force of the muscles by the variation trend of the EMG envelope curve, this method lay the root for the real-time processing of the follow-up EMG and the control of the artificial hand because of its simple algorithm and fast operation.
Surface electromyography signals (SEMG), Envelop filter, Spectrum analysis, Power frequency interference
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