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Bone conduction calibration: current status.

D D Dirks, S F Lybarger, W O Olsen

    The Journal of Speech and Hearing Disorders
    |May 1, 1979
    PubMed
    Summary
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    New artificial mastoids improve uniformity but have higher impedances. Bone-conduction hearing thresholds were measured in 60 normal listeners using these devices for future reference threshold development.

    Area of Science:

    • Audiology
    • Hearing Science
    • Biomedical Engineering

    Background:

    • Establishing normal bone-conduction hearing thresholds is challenging due to unreliable artificial mastoid measurements.
    • Previous artificial mastoids lacked uniformity, hindering accurate bone-conduction sensitivity assessments.

    Purpose of the Study:

    • To evaluate bone-conduction hearing thresholds using modified Bruel and Kjaer 4930 artificial mastoids.
    • To assess the suitability of new artificial mastoids for developing a reference threshold for bone-conduction hearing.

    Main Methods:

    • Sixty normal-hearing listeners participated across three independent laboratories.
    • Bone-conduction thresholds were measured using the newly designed Bruel and Kjaer 4930 artificial mastoids.
    • Impedance measurements of the new artificial mastoids were compared to current standards.

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    Main Results:

    • The modified Bruel and Kjaer 4930 artificial mastoids demonstrated improved unit uniformity.
    • The new design exhibited higher impedances than recommended by current international standards.
    • Bone-conduction thresholds were successfully measured and recorded for all participants.

    Conclusions:

    • The improved uniformity of the new artificial mastoids is a positive step towards reliable bone-conduction measurements.
    • The elevated impedance requires consideration and potential recalibration for accurate reference threshold development.
    • Further research and standardization are needed to establish a definitive reference threshold for bone-conduction hearing.