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Phonemic information transmitted by a multichannel electrotactile speech processor.

P J Blamey1, R S Cowan, J I Alcantara

  • 1University of Melbourne, Royal Victorian Eye and Ear Hospital, Australia.

Journal of Speech and Hearing Research
|December 1, 1988
PubMed
Summary
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This study evaluated a wearable electrotactile speech processor for hearing-impaired individuals. The device uses electrical pulses for tactile feedback, aiding speech recognition and supplementing lipreading for better communication.

Area of Science:

  • Biomedical Engineering
  • Audiology
  • Neuroscience

Background:

  • Hearing impairment affects millions globally, necessitating innovative assistive technologies.
  • Traditional hearing aids and cochlear implants have limitations for some individuals.
  • Tactile sensory substitution offers a potential alternative or supplement for auditory information.

Purpose of the Study:

  • To evaluate a wearable electrotactile speech processor for its efficacy in aiding speech recognition.
  • To determine if tactile information alone or combined with lipreading improves speech perception.
  • To assess the device's utility for individuals with severe to profound hearing loss.

Main Methods:

  • A wearable electrotactile speech processor was developed to estimate and convey speech parameters (fundamental frequency, second-formant frequency, amplitude) via electrical pulses.

Related Experiment Videos

  • Seven normally hearing and four hearing-impaired subjects participated in the evaluation.
  • Subjects used tactile information alone and in combination with lipreading for word recognition tasks.

    • Main Results:

    • The electrotactile processor provided useful phoneme recognition information using tactile input alone in closed-set word recognition.
    • Supplementing lipreading with tactile information significantly improved open-set word recognition.
    • Improvements were noted in recognizing vowel duration, formant frequencies, consonant voicing, and manner of articulation, particularly for final consonants.

    Conclusions:

    • The wearable electrotactile speech processor shows promise as an assistive device for hearing-impaired individuals.
    • The device effectively translates acoustic speech features into tactile electrical stimulation.
    • It can enhance speech understanding, especially when combined with lipreading, offering benefits for those with severe and profound hearing loss.