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[A study on digitally processed sounds designed to improve speech sound perception]

M Arai1

  • 1Department of Otolaryngology, Tokyo Medical College.

Nihon Jibiinkoka Gakkai Kaiho
|August 1, 1994
PubMed
Summary

Digital sound processing, including amplification and filtering, significantly improved speech sound perception for patients with sensorineural hearing loss. Specific enhancements benefited consonants and voiced sounds, with filtering proving effective in noisy environments.

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Area of Science:

  • Audiology
  • Speech-Language Pathology
  • Digital Signal Processing

Context:

  • Sensorineural hearing loss presents significant challenges in speech sound discrimination.
  • Traditional hearing aids may not fully restore perception of all speech sounds.
  • Digital processing offers potential for targeted acoustic modification.

Purpose:

  • To investigate the efficacy of digitally processed sounds in enhancing speech sound perception for individuals with moderate sensorineural deafness.
  • To determine which specific digital processing techniques (amplification, repetition, filtering) are most effective for different sound categories.

Summary:

  • Digitally processed consonant-vowel (CV) sounds, including amplified or repeated consonant bursts and voice onset time (VOT), were presented to patients with sensorineural deafness.

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  • Amplification and/or repetition improved correct answer rates for unvoiced explosive sounds (/pa, ta, ka/) and some voiced sounds (/za, ra, ga, ma, na/).
  • Digital filtering enhanced perception of sibilant sounds (/sa, su, se, so/), particularly in noisy conditions, while semivowels and glottal sounds required no processing.

    • Impact:

    • Digital sound processing techniques can significantly improve speech sound discrimination in sensorineural deafness.
    • Targeted acoustic modifications offer a promising avenue for audiological rehabilitation.
    • Further research into digital signal processing may lead to more effective hearing loss management strategies.