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Hearing aid evaluation: predicting speech gain from insertion gain

H Dillon1

  • 1National Acoustic Laboratories, Chatswood, Australia.

Journal of Speech and Hearing Research
|June 1, 1993
PubMed
Summary
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Predicting hearing aid speech gain is possible using electroacoustic measures. This method accurately estimates aided vs. unaided performance, offering a quicker alternative to traditional testing for individuals with hearing loss.

Area of Science:

  • Audiology
  • Speech-Language Pathology
  • Acoustics

Background:

  • Hearing aid gain is crucial for speech understanding.
  • Accurate prediction of speech gain can optimize hearing aid fitting.
  • Current methods may be time-consuming.

Purpose of the Study:

  • To define and predict hearing aid speech gain using the articulation index.
  • To validate predicted speech gain against measured speech gain.
  • To assess the influence of different importance functions on prediction accuracy.

Main Methods:

  • Defined speech gain as the difference between aided and unaided performance-intensity functions.
  • Utilized the articulation index method incorporating unaided thresholds, noise, and hearing aid characteristics.

Related Experiment Videos

  • Tested 11 subjects with mild-to-moderate hearing loss using monosyllabic words and continuous discourse.

    • Main Results:

    • Predicted speech gain showed strong agreement with measured speech gain (3 dB rms error).
    • Prediction accuracy was consistent across different importance functions.
    • Speech gain measurements were highly correlated between monosyllabic word and continuous discourse tests.

    Conclusions:

    • Hearing aid speech gain can be reliably predicted from electroacoustic measures.
    • This predictive approach offers a time-efficient alternative for hearing aid fitting.
    • The findings support the use of electroacoustic measures for optimizing hearing aid performance.