Real-time implementation of electromyogram pattern recognition as a control command of man-machine interface

Gwo Ching Chang, Wen Juh Kang, Luh Jer-Junn, Cheng Kung Cheng, Jin Shin Lai, Jia Jin J. Chen, Te Son Kuo

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

The purpose of this study was to develop a real-time electromyogram (EMG) discrimination system to provide control commands for man-machine interface applications. A host computer with a plug in data acquisition and processing board containing a TMS320 C31 floating point digital signal processor was used to attain real-time EMG classification. Two-channel EMG signals were collected by twopairs of surface electrodes located bilaterally between the sternocleidomastoid and the upper trapezius. Five motions of the neck and shoulders were discriminated for each subject. The zero-crossing rate was employed to detect the onset of muscle contraction. The cepstral coefficients, derived from autoregressive coefficients and estimated by a recursive least square algorithm, were used as the recognition features. These features were then discriminated using a modified maximum likelihood distance classifier. The total response time of this EMG discrimination system was achieved about within 0.17 s. Four able-bodied and two C5/6 quadriplegic subjects took part in the experiment, and achieved 95% mean recognition rate in discrimination between the five specific motions. The response time and the reliability of recognition indicate that this system has the potential to discriminate body motions for man-machine interface applications.

Original languageEnglish
Pages (from-to)529-537
Number of pages9
JournalMedical Engineering and Physics
Volume18
Issue number7
DOIs
Publication statusPublished - 1996 Oct

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biomedical Engineering

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