Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Stimulus Artifact Suppression Using the Stimulation Synchronous Adaptive Impulse Correlated Filter for Surface EMG Application

  • Yeom, Ho-Jun (Dept. of Biomedical Engineering, Eulji Univ.) ;
  • Park, Ho-Dong (MEZOO Inc.) ;
  • Chang, Young-Hui (Department of Biomedical Engineering, Yonsei Univ., Department of Applied Physiology/Biomedical Engineering, Georgia Tech) ;
  • Park, Young-Chol (Department of Computer & Telecommunications Engineering, Yonsei Univ.) ;
  • Lee, Kyoung-Joung (Department of Biomedical Engineering, Yonsei Univ., Department of Applied Physiology/Biomedical Engineering, Georgia Tech)
  • Received : 2011.05.17
  • Accepted : 2012.02.01
  • Published : 2012.05.01
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Abstract

The voluntary EMG (vEMG) signal from electrically stimulated muscle is very useful for feedback control in functional electrical stimulation. However, the recorded EMG signal from surface electrodes has unwanted stimulation artifact and M-wave as well as vEMG. Here, we propose an event-synchronous adaptive digital filter for the suppression of stimulation artifact and M-wave in this application. The proposed method requires a simple experimental setup that does not require extra hardware connections to obtain the reference signals of adaptive digital filter. For evaluating the efficiency of this proposed method, the filter was tested and compared with a least square (LS) algorithm using previously measured data. We conclude that the cancellation of both primary and residual stimulation artifacts is enhanced with an event-synchronous adaptive digital filter and shows promise for clinical application to rehabilitate paretic limbs. Moreover because this algorithm is far simpler than the LS algorithm, it is portable and ready for real-time application.

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References

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