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http://dx.doi.org/10.5302/J.ICROS.2005.11.1.041

A Novel EMG-based Human-Computer Interface for Electric-Powered Wheelchair Users with Motor Disabilities  

Lee Myung-Joon (재활공학연구소)
Chu Jun-Uk (재활공학연구소)
Ryu Je-Cheong (재활공학연구소)
Mun Mu-Seong (재활공학연구소)
Moon Inhyuk (재활공학연구소)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.11, no.1, 2005 , pp. 41-49 More about this Journal
Abstract
Electromyogram (EMG) signal generated by voluntary contraction of muscles is often used in rehabilitation devices because of its distinct output characteristics compared to other bio-signals. This paper proposes a novel EMG-based human-computer interface for electric-powered wheelchair users with motor disabilities by C4 or C5 spine cord injury. User's commands to control the electric-powered wheelchair are represented by shoulder elevation motions, which are recognized by comparing EMG signals acquired from the levator scapulae muscles with a preset double threshold value. The interface commands for controlling the electric-powered wheelchair consist of combinations of left-, right- and both-shoulders elevation motions. To achieve a real-time interface, we implement an EMG processing hardware composed of analog amplifiers, filters, a mean absolute value circuit and a high-speed microprocessor. The experimental results using an implemented real-time hardware and an electric-powered wheelchair showed that the EMG-based human-computer interface is feasible for the users with severe motor disabilities.
Keywords
electromyogram; human-computer interface; shoulder elevation motion; double threshold; electric-powered wheelchair;
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