Character Input by Myoelectric Signals

Antonín Pošusta, Ondřej Poláček, Adam J. Sporka, Tomáš Flek, Jakub Otáhal


Detection of sEMG is used in order to create a novel system for text entry, consisting of combination of a hardware device and a dedicated software tool. Our system is intended for people with a disability of upper extremities who have not lost the ability to control the muscles in them. We used standard self-adhesive Ag/AgCl electrodes for the acquisition of the signal which was analyzed in order to detect movement of selected two fingers on the hand. The fingers controlled the text entry. Two different text entry methods were implemented, Scanning LetterWise and 2-FOCL. We performed a longitudinal study of these methods with a limited number of participants who were able to achieve the type rate up to 4.5 words per minute using 2-FOCL.


assistive techonology, text input, electromyography, user study

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ISSN 1801-1217 (Print)
ISSN 1805-9422 (Online)
Published by the Czech Technical University in Prague, Faculty of Mechanical Engineering