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Coupler output level differences resulting from repeated transducer placement.

T Frank, J O Chaffinch, C S Svitko

    Ear and Hearing
    |August 1, 1986
    PubMed
    Summary
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    Repeated placement of audiometric transducers (TDH-49 earphones, B-71/B-72 bone vibrators) showed minimal output variation, generally within ANSI tolerance levels. Training did not significantly improve placement consistency for these hearing test devices.

    Area of Science:

    • Audiology
    • Hearing Instrument Technology
    • Acoustics

    Background:

    • Accurate hearing assessment relies on consistent transducer placement.
    • Variability in earphone and bone vibrator placement can affect audiometric results.
    • Understanding placement consistency is crucial for reliable hearing testing protocols.

    Purpose of the Study:

    • To quantify the coupler output level variability for repeated placements of TDH-49 earphones and B-71/B-72 bone vibrators.
    • To assess the impact of subject experience and training on placement consistency.
    • To determine if placement differences exceed American National Standards Institute (ANSI) tolerance levels.

    Main Methods:

    • Six repeated placements of TDH-49 earphones (P/N 51 cushion, NBS 9A coupler) and B-71/B-72 bone vibrators (mechanical coupler) were performed.

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  • Coupler output levels were measured across frequencies (250-4000 Hz) using experienced and untrained subjects.
  • The range of output levels (max-min) across placements was calculated for each subject, transducer, and frequency.

    • Main Results:

    • Coupler output level differences were similar between experienced and untrained subjects and were not reduced by training.
    • TDH-49 earphone differences were consistently below 1 dB across frequencies and within ANSI tolerances.
    • B-71/B-72 bone vibrator differences were higher, frequency-dependent, and generally within ANSI tolerances, though some subjects exceeded limits, particularly for the B-72 at specific frequencies.

    Conclusions:

    • Repeated placement of TDH-49 earphones demonstrates high consistency, well within acceptable limits.
    • Bone vibrator placement consistency is generally acceptable but shows greater variability and frequency dependence than earphones.
    • While training did not improve consistency, some individual bone vibrator placements may exceed ANSI tolerances, necessitating careful attention during hearing testing.