EMG Onset Detection Based on Teager-Kaiser Energy Operator and Morphological Close Operation

As a typical biomedical signal, the electromyography EMG is now widely used as a human-machine interface in the control of robotic rehabilitation devices such as prosthetic hands and legs. Immediately detecting and eliciting of a valid EMG signal are greatly anticipated for ensuring a fast-response and high-precision EMG control scheme. This paper utilizes two schemes, Teager-Kaise Engergy TKE operator and Morphological Close Operation MCO, to improve the accuracy of the onset/offset detection of EMG activities. The TKE operator is used to amplify the EMG signal's amplitude change on the initiation/cessation phases, while the MCO is adopted to filter out the false positives of the binary sequence obtained by the fore TKE operation. This method is simple and easily to be implemented. After selecting appropriate filtering parameters T1, T2 and j, it can achieve precise onset detection absolute error <10ms over a variety of signal-to-noise ratios SNR of the biomedical signal.

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