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Related Experiment Videos

Evaluation of fitting rules with a programmable hearing aid

J van den Heuvel1, S T Goverts, T S Kapteyn

  • 1Department of Clinical Audiology, University Hospital VU, Amsterdam, The Netherlands.

Audiology : Official Organ of the International Society of Audiology
|September 26, 1997
PubMed
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The NAL hearing aid fitting rule best predicted gain settings for hearing-impaired patients. Separate processing of low and high frequencies improved speech intelligibility in noise.

Area of Science:

  • Audiology
  • Hearing Aid Technology

Background:

  • Hearing aids aim to optimize audibility and speech understanding.
  • Standard hearing aid fitting formulas (NAL, POGO, Berger, Half Gain) provide starting points for gain adjustment.
  • Multi-programmable hearing aids offer flexibility but require effective programming strategies.

Purpose of the Study:

  • To identify an optimal frequency-gain response for the 3M 8200 hearing aid using standard calculation rules.
  • To evaluate the utilization and patient satisfaction with multiple hearing aid programs.
  • To assess the impact of hearing aid settings on speech intelligibility and sound quality.

Main Methods:

  • A multi-programmable hearing aid (3M 8200) was evaluated by 126 hearing-impaired patients.
  • Patients underwent speech intelligibility and sound quality tests with various fitting rules.

Related Experiment Videos

  • The National Acoustic Laboratories (NAL) rule was compared against POGO, Berger, and Half Gain rules.

    • Main Results:

    • The NAL rule most closely approximated the final, preferred hearing aid program settings.
    • NAL provided the best prediction of gain at 1000 Hz compared to other rules.
    • Patient-guided optimization of standard rules did not yield improved outcomes.
    • Speech-to-noise ratio (S/N) improved by 2.5 dB on the SRT-in-noise test.

    Conclusions:

    • The NAL fitting rule is a reliable method for initial hearing aid gain prescription.
    • Separate processing of low- and high-frequency sounds is a beneficial approach for hearing aid users.
    • Further research into advanced signal processing strategies for hearing aids is warranted.