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Intelligibility in noise using multimicrophone hearing aids

P Lurquin, S Rafhay

    Acta Oto-Rhino-Laryngologica Belgica
    |January 1, 1996
    PubMed
    Summary
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    Hearing impaired individuals struggle with speech in noise. Multi-microphone directional hearing aids significantly improve speech-to-noise ratio (S/N), making hearing performance comparable to normal hearers.

    Area of Science:

    • Audiology
    • Speech and Hearing Sciences
    • Biomedical Engineering

    Background:

    • Difficulty understanding speech in background noise is a primary challenge for individuals with hearing impairment.
    • Traditional hearing aids with omnidirectional microphones offer limited benefit in overcoming this disadvantage.

    Purpose of the Study:

    • To compare the speech-in-noise test performance between hearing-impaired and normal-hearing listeners.
    • To evaluate the effectiveness of multi-microphone directional hearing aids in improving speech intelligibility in noise.

    Main Methods:

    • Two groups of listeners (hearing-impaired and normal-hearing) were tested on a speech-in-noise test.
    • Performance was measured by the signal-to-noise ratio (S/N) required to achieve 50% correct identification.

    Related Experiment Videos

  • A comparison was made between classic omnidirectional hearing aids and multi-microphone directional hearing aids for the hearing-impaired group.

    • Main Results:

    • Hearing-impaired listeners required an average of 7.4 dB better S/N than normal hearers to achieve criterion performance.
    • Multi-microphone directional hearing aids provided a significant average S/N improvement of 6.6 dB for the hearing-impaired group.
    • No significant difference in performance was found between hearing-impaired listeners using directional aids and normal hearers.

    Conclusions:

    • Classic hearing aids are insufficient for overcoming the S/N disadvantage caused by hearing loss.
    • Multi-microphone directional hearing aids significantly enhance speech perception in noise for hearing-impaired individuals.
    • Directional hearing aid technology can restore speech-in-noise performance to levels comparable to normal hearing.