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An equivalent input noise level criterion for hearing aids

J H Macrae1, H Dillon

  • 1National Acoustic Laboratories, Chatswood NSW, Australia.

Journal of Rehabilitation Research and Development
|October 1, 1996
PubMed
Summary
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The maximum acceptable noise level for hearing aids can be relaxed for devices with higher gain, according to a modified National Acoustic Laboratories procedure. This relaxation varies non-linearly with gain across frequencies, preventing a simple adjustment rule.

Area of Science:

  • Audiology
  • Hearing Aid Technology
  • Acoustics

Background:

  • Hearing aid performance is influenced by internal noise, quantified by Equivalent Input-Referenced Noise Level (EINL).
  • Standard procedures for hearing aid fitting, like the National Acoustic Laboratories (NAL) method, aim to optimize audibility and speech understanding.
  • Modifications to fitting procedures exist for individuals with severe to profound hearing loss.

Purpose of the Study:

  • To establish a maximum acceptable Equivalent Input-Referenced Noise Level (EINL) for hearing aids.
  • To investigate if the EINL criterion can be adjusted based on hearing aid gain, particularly for severe and profound hearing loss.

Main Methods:

  • Utilized a modified version of the National Acoustic Laboratories (NAL) procedure for hearing aid gain and frequency response selection.

Related Experiment Videos

  • Analyzed the relationship between the EINL criterion and hearing aid gain across different frequencies.
  • Examined the non-linear relationship between criterion relaxation and 2-cc coupler gain.

    • Main Results:

    • The EINL criterion can be relaxed for hearing aids with higher gain when using the modified NAL procedure.
    • This relaxation is dependent on the hearing aid's gain.
    • The relationship between EINL relaxation and 2-cc coupler gain is non-linear and varies with frequency.

    Conclusions:

    • A modified NAL procedure allows for a relaxed EINL criterion for higher-gain hearing aids.
    • The non-linear, frequency-dependent nature of this relaxation means a simple, universal rule for adjustment is not feasible.
    • Further research may be needed to develop more nuanced guidelines for EINL in high-gain hearing aids.