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Related Experiment Videos

The effect of frequency tolerance on audiometer accuracy.

R W Guelke, J D Floyd, F J van Zyl

    South African Medical Journal = Suid-Afrikaanse Tydskrif Vir Geneeskunde
    |December 3, 1977
    PubMed
    Summary

    Audiometer calibration at 6,000 Hz using TDH39 receivers can be inconsistent. A new TDH50 receiver offers improved stability, requiring the same calibration as the TDH39 for reliable hearing tests.

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    Area of Science:

    • Audiology
    • Acoustics
    • Metrology

    Background:

    • Accurate audiometer calibration is crucial for reliable hearing assessments.
    • Standard calibration methods may introduce variability, particularly at specific frequencies.
    • Existing equipment like the TDH39 telephone receiver has known limitations.

    Purpose of the Study:

    • To investigate inconsistencies in audiometer calibration at 6,000 Hz.
    • To evaluate the frequency sensitivity of the TDH39 telephone receiver.
    • To introduce and assess the performance of the new TDH50 telephone receiver.

    Main Methods:

    • Calibration of TDH39 receivers using a 9A coupler per ISO R389.
    • Testing receiver sensitivity to frequency variations around 6,000 Hz.
    • Comparative analysis of TDH39 and TDH50 receiver performance.

    Main Results:

    • The TDH39 receiver exhibits significant (up to 7 dB) calibration variability with frequency fluctuations within tolerance.
    • The TDH50 receiver demonstrates markedly reduced sensitivity to frequency variation.
    • Recommended calibration threshold figures for TDH50 are identical to those for TDH39.

    Conclusions:

    • Standard audiometer calibration at 6,000 Hz requires careful attention to frequency precision.
    • The TDH50 receiver offers a more stable and reliable alternative for audiometric testing.
    • Consistent calibration practices are essential for accurate hearing evaluations.

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