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Applying vowel sounds to command support systems for motor-impaired people

Abstract:

A novel approach to low-cost microprocessor-based speech analysis and processing has been developed. Real-time Spanish vowel recognition accuracy of 98-76 per cent with an average time response of 200 ms in a noisy room is possible with very simple hardware and software. The voice-recognition method can be implemented in any commercially available 8-bit microprocessors. Also, the adjustment of the system to match other users vocal characteristics is easily performed. The voicerecognition system has been applied to the design of assistive devices for high-level quadriplegics, to provide a more natural method of man-machine communication. Voice is used to command a low-cost personal computer that serves as a support system for a motor-impaired person. By choosing proper sequences of vowel sounds, the patient can control his environment, dial a telephone, handle a telephone directory, play games etc. The extent of possible tasks is limited by the software available. © 1987 IFMBE.