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The comparison of electromyographic pattern classifications with active and passive electrodes
Ying-Han Chiou1, Jer-Junn Luh, Shih-Ching Chen
1Department of Electrical Engineering, National Taiwan University, Taiwan, People's Republic of China.
Medical Engineering & Physics
|July 24, 2004
Summary
Active and passive electrodes show comparable performance in classifying electromyographic (EMG) signals for prosthetic limb control. Differences in recognition rates are negligible, aiding assistive device development.
Area of Science:
- Biomedical Engineering
- Rehabilitation Engineering
- Signal Processing
Background:
- Electromyographic (EMG) signals are crucial for controlling myoelectric prosthetic limbs.
- Surface electrodes, both active and passive, are commonly used for EMG acquisition.
- Clinical applications often favor active electrodes, while passive electrodes are prevalent in research settings.
Purpose of the Study:
- To investigate potential differences in EMG pattern classification accuracy between active and passive electrodes.
- To determine the clinical relevance of electrode type selection for myoelectric control systems.
Main Methods:
- EMG signals were recorded using both active and passive surface electrodes.
- Autoregressive and cepstral coefficients were extracted as feature sets.
- Recognition rates for EMG pattern classification were evaluated for each electrode type.
Main Results:
- Passive electrodes yielded recognition rates comparable to active electrodes.
- Averaged recognition rates were 88.5% for passive and 85.84% for active electrodes (autoregressive coefficients).
- Averaged recognition rates were 84.84% for passive and 83.5% for active electrodes (cepstral coefficients).
Conclusions:
- No statistically significant differences were found between the recognition rates obtained from active and passive electrodes.
- The choice between active and passive electrodes may have a negligible impact on EMG pattern classification accuracy.
- These findings support the potential for using either electrode type in the myoelectric control of assistive devices.