Article,

Unstable Morse Code recognition system with back propagation neural network for person with disabilities.

, and .
J Med Eng Technol, 25 (3): 118--123 (2001)

Abstract

A Morse code auto-recognition system is limited by stable typing speed and stable typing ratio from long to short intervals. For an unstable Morse code typing pattern, the auto-recognition algorithms in the literature are not good enough for applications. This paper adopted a neural network to recognize unstable Morse codes. From an experiment on a teenager with cerebral palsy, the neural network has an average recognition rate up to 93.2\%. The recognition rate from an amputee aged 40, who used a prosthesis for typing, it is 97.2\% on average. When we compare this to 99.2\% for the recognition rate from a skilled expert, the result is quite promising. The neural network has successfully overcome the difficulty of analysing a severely unstable Morse code time series. Since the human typing speed is quite slow in comparison to signal processing by the computer, it also makes it possible to use a neural network for real-time signal recognition.

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