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Problems with earphone calibration using a manikin.

J M Ciechanowski, W A Cooper

    Journal of the American Audiology Society
    |November 11, 1976
    PubMed
    Summary
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    Psychoacoustic and electroacoustic measurements of TDH-39 receivers revealed differences across cushions and couplers, indicating current methods are inadequate for earphone calibration. The Knowles Electronic Manikin for Acoustic Research (KEMAR) is unsuitable for supra-aural or circumaural earphone calibration.

    Area of Science:

    • Audiology
    • Acoustics
    • Biomedical Engineering

    Background:

    • Accurate calibration of audiometric earphones is crucial for reliable hearing assessments.
    • Existing manikins and couplers may not fully represent human ear canal acoustics for circumaural earphones.
    • The TDH-39 receiver is a common headphone used in audiology.

    Purpose of the Study:

    • To evaluate the psychoacoustic and electroacoustic performance of the TDH-39 receiver with different circumaural cushions (MX-41/AR and Auraldome).
    • To assess the suitability of standard couplers and the Zwislocki coupler with the Knowles Electronic Manikin for Acoustic Research (KEMAR) for earphone calibration.

    Main Methods:

    • Psychoacoustic and electroacoustic measurements were conducted.
    • Testing involved a single TDH-39 receiver mounted in MX-41/AR and Auraldome cushions.

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  • Measurements utilized standard couplers and the Zwislocki coupler integrated with KEMAR.

    • Main Results:

    • Psychoacoustic data showed similarity between the two cushions.
    • Electroacoustic responses exhibited differences across cushions and couplers.
    • KEMAR, in its current configuration, demonstrated limitations for supra-aural and circumaural earphone calibration.

    Conclusions:

    • Current methods for evaluating circumaural earphones are not yet sufficiently accurate.
    • The KEMAR manikin requires further development to be suitable for calibrating supra-aural and circumaural earphones.
    • Further research is needed to develop standardized and accurate earphone calibration techniques.