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Earmold modification effect measured by coupler, threshold and probe techniques.

G A Studebaker, R M Cox, D J Wark

    Audiology : Official Organ of the International Society of Audiology
    |March 1, 1978
    PubMed
    Summary
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    Probe tube microphone measurements accurately assess hearing threshold changes due to earmold modifications. Coupler measurements, however, provide less accurate real-world estimations of these effects.

    Area of Science:

    • Audiology
    • Acoustics
    • Biomedical Engineering

    Background:

    • Accurate hearing aid fitting requires precise measurement of acoustic changes.
    • Earmold modifications significantly impact sound delivery and subject thresholds.
    • Traditional coupler methods may not fully represent real-ear acoustic conditions.

    Purpose of the Study:

    • To investigate the validity of probe tube microphone measurements for assessing hearing threshold changes.
    • To compare probe tube measurements with coupler measurements (2-cm3 and Zwislocki) under various earmold conditions.
    • To evaluate the accuracy of different measurement techniques in predicting real-ear effects.

    Main Methods:

    • Subjects' hearing thresholds were measured under standard, vented, and open earmold conditions.

    Related Experiment Videos

  • Probe tube microphone measurements were conducted in the real ear canal.
  • Corresponding measurements were taken using 2-cm3 and Zwislocki couplers.

    • Main Results:

    • Probe tube measurements showed high validity, closely matching threshold data except at low frequencies (125-165 Hz) potentially due to noise.
    • Neither the 2-cm3 nor the Zwislocki coupler accurately quantified the effects of vented or open earmolds.
    • The Zwislocki coupler provided a better approximation of real-ear effects compared to the 2-cm3 coupler.

    Conclusions:

    • Probe tube microphone measurements are a valid and reliable method for assessing hearing aid performance changes.
    • Standard acoustic couplers have limitations in predicting the in-situ acoustic effects of earmold modifications.
    • Further research may be needed to refine coupler designs for improved real-ear prediction.