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Threshold-based fitting methods for non-linear (WDRC) hearing instruments--comparison of acoustic characteristics.

K Smeds1, A Leijon

  • 1Department of Speech, Music, and Hearing, Royal Institute of Technology, Stockholm, Sweden. karolina@speech.kth.se

Scandinavian Audiology
|February 16, 2002
PubMed
Summary

Comparing hearing aid fitting methods revealed significant variations in loudness perception, but minimal differences in speech intelligibility index (SII). Manufacturers

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Area of Science:

  • Audiology and Hearing Science
  • Acoustics and Signal Processing

Background:

  • Non-linear hearing instruments require precise prescriptive fitting methods for optimal performance.
  • Existing prescriptive methods for hearing aids vary, potentially leading to different outcomes.
  • Understanding the impact of different fitting strategies on audibility and speech intelligibility is crucial.

Purpose of the Study:

  • To compare the performance of six threshold-based prescriptive fitting methods for non-linear hearing instruments.
  • To evaluate the differences in estimated gain, calculated loudness, and speech intelligibility index (SII) across methods.
  • To assess the accuracy of hearing aid manufacturers' implementation of selected prescriptive methods.

Main Methods:

  • Six hearing aids were programmed using manufacturers' recommendations for a standard audiogram and simulated listening conditions.

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  • Coupler gain measurements were performed using speech-like signals.
  • Loudness perception and Speech Intelligibility Index (SII) were calculated for each fitting method.

    • Main Results:

    • Significant discrepancies were observed in the estimated insertion gain-frequency responses between the fitting methods.
    • Calculated loudness showed substantial variations across methods, while SII calculations exhibited minimal differences.
    • Large discrepancies were found between the prescribed gain and the actual implemented gain by hearing aid manufacturers for two methods (DSL[i/o] and FIG6).

    Conclusions:

    • Prescriptive fitting methods for non-linear hearing aids can lead to considerable differences in loudness perception.
    • Speech intelligibility appears less sensitive to variations among these fitting methods compared to loudness.
    • Hearing aid manufacturers' implementation of prescriptive formulas may deviate significantly from the original prescriptions, impacting device performance.