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Related Experiment Videos

Hearing aid coupler output level variability and coupler correction levels for insert earphones.

T Frank1, W D Richards

  • 1Department of Communication Disorders, Penn State University, University Park.

Ear and Hearing
|June 1, 1991
PubMed
Summary

Sound pressure levels (SPLs) in hearing aid (HA) couplers were stable across repeated measurements. Differences in SPLs between coupler types at higher frequencies were due to geometric variations.

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Area of Science:

  • Acoustics
  • Audiology
  • Metrology

Background:

  • Accurate measurement of sound pressure levels (SPLs) is crucial for hearing aid (HA) fitting and performance evaluation.
  • Different earphone coupler types exist, potentially leading to variations in SPL measurements.
  • Understanding coupler characteristics is essential for consistent and reliable hearing aid testing.

Purpose of the Study:

  • To compare sound pressure levels (SPLs) measured using three different hearing aid coupler types: HA-1, HA-2, and DB-0138.
  • To assess the stability and repeatability of SPL measurements across different experimenters and repeated trials.
  • To investigate the reasons for any observed differences in SPLs between the coupler types, particularly at higher frequencies.

Main Methods:

  • Two types of insert earphones (ER-3A and EARTONE 3A) were used for measurements.

Related Experiment Videos

  • Sound pressure levels (SPLs) were measured using HA-1, HA-2, and DB-0138 configured couplers.
  • Independent measurements were conducted by two experimenters over five repeated trials, with and without coupler replacement.

    • Main Results:

    • SPL measurements were highly stable across all experimenters, repeated trials, and coupler types, with variations of +/- 0.2 dB from 125 to 8000 Hz.
    • Mean SPLs for HA-1 and HA-2 couplers were similar for each earphone type across the measured frequency range.
    • From 3000 to 8000 Hz, the DB-0138 coupler yielded higher SPLs compared to HA-1 and HA-2 couplers due to geometrical differences and acoustic effects.

    Conclusions:

    • The tested HA coupler types (HA-1, HA-2, DB-0138) demonstrate high measurement stability and repeatability.
    • Geometrical differences in earphone-to-coupler connections and coupler design lead to significant SPL variations at higher frequencies (3-8 kHz).
    • Observed SPL differences can be attributed to quarter-wave resonances and acoustic horn effects within the coupler systems.