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Psychoacoustic Aspects of Speech Pattern Coding for the Deaf.

Andrew Faulkner1, Adrian J Fourcin1, Brian C J Moore2

  • 1Department of Phonetics and Linguistics, University College London, London, England.

Acta Oto-Laryngologica
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PubMed
Summary

The SiVo aid, offering voice fundamental frequency and voicing cues, improved speech perception for profoundly deaf adults compared to conventional hearing aids. Some users with severe hearing loss benefited significantly from this novel auditory aid.

Keywords:
SiVo aidaided lipreadingfundamental frequencyprofound deafnessvoiced/voiceless

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Area of Science:

  • Audiology
  • Speech-Language Pathology
  • Assistive Listening Devices

Background:

  • Conventional hearing aids with extended low-frequency output may not fully restore speech perception for individuals with profound hearing loss.
  • Lipreading remains a primary communication method for many deaf individuals, but it is often insufficient for understanding speech nuances.

Purpose of the Study:

  • To compare the effectiveness of the SiVo aid, which provides voice fundamental frequency and voicing information, against a conventional hearing aid for aiding lipreading.
  • To assess speech perception improvements in consonant identification and intonation contrast using these different assistive listening devices.

Main Methods:

  • Eight profoundly deaf adults participated in the study.
  • Speech perception tests included consonant confusions in lipreading and intonation contrast identification.
  • Audiometric and psychoacoustic measures were collected to characterize hearing loss.

Main Results:

  • Six out of seven patients performed better on the intonation task with the SiVo aid.
  • Four patients preferred the SiVo aid, with two showing significant improvements in aided lipreading of consonants.
  • Patients preferring the SiVo aid often had profound hearing loss and limited dynamic range; some showed benefits from added voiceless excitation patterns.

Conclusions:

  • The SiVo aid demonstrates potential as an effective assistive listening device for improving speech perception, particularly intonation, in profoundly deaf individuals.
  • The device may offer significant advantages for specific user profiles, including those with severe hearing loss and limited frequency selectivity.
  • Further research into incorporating voiceless excitation patterns could enhance the benefits of such aids for consonant perception.