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NAL-NL2 empirical adjustments.

Gitte Keidser1, Harvey Dillon, Lyndal Carter

  • 1National Acoustic Laboratories and the HEARing Cooperative Research Centre, Chatswood, Australia. gitte.keidser@nal.gov.au

Trends in Amplification
|December 4, 2012
PubMed
Summary
This summary is machine-generated.

The National Acoustic Laboratories nonlinear 2 (NAL-NL2) formula refines hearing aid gain prescriptions. Empirical data show adjustments are needed for user preference, hearing loss severity, and fitting type, improving audibility and comfort.

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Area of Science:

  • Audiology
  • Hearing Science
  • Acoustics

Background:

  • The National Acoustic Laboratories nonlinear 1 (NAL-NL1) was the first theoretically derived formula for nonlinear hearing aid gain.
  • NAL-NL1 aimed to maximize speech intelligibility while maintaining normal loudness levels.

Purpose of the Study:

  • To present the theoretically derived NAL-NL2 formula.
  • To describe adjustments to NAL-NL2 based on empirical data and user preferences.

Main Methods:

  • Theoretically derived formula using updated models and revised optimization.
  • Incorporation of empirical data from studies using NAL-NL1 as a baseline.

Main Results:

  • Empirical data indicated specific user groups prefer different gain levels (e.g., females, new users, adults).
  • Severe/profound hearing loss users prefer lower compression ratios with fast-acting compression.

Conclusions:

  • The NAL-NL2 formula incorporates adjustments for diverse user needs and hearing loss characteristics.
  • These adjustments aim to improve hearing aid fitting outcomes and user satisfaction.