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Related Experiment Videos

Bone-conducted speech: intelligibility functions and threshold force levels for spondees

R C Beattie, R A Smiarowski

    The American Journal of Otology
    |October 1, 1981
    PubMed
    Summary

    This study determined normal hearing threshold force levels for bone vibrators and established speech intelligibility functions. Results suggest various calibration signals are suitable for bone vibrator speech delivery.

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    Area of Science:

    • Audiology
    • Speech Science
    • Hearing Research

    Background:

    • Bone vibrator testing is crucial for assessing hearing.
    • Standardized calibration methods are needed for reliable results.
    • Understanding speech intelligibility via bone conduction is important for hearing aid fitting.

    Purpose of the Study:

    • To determine threshold force values for spondees using Radioear B-70-AA and B-71 bone vibrators.
    • To establish normal speech intelligibility functions for the CID W-22 test using the B-71 vibrator.
    • To evaluate the suitability of different noise signals for bone vibrator calibration.

    Main Methods:

    • Thirty-six normal-hearing subjects participated in threshold force measurements.
    • Radioear B-70-AA and B-71 bone vibrators were used with a P-3333 headband.

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  • Measurements were conducted on a Bruel & Kjaer model 4930 artificial mastoid.
  • Sixteen normal-hearing subjects were tested for speech intelligibility using the CID W-22 test at various sensation levels.

    • Main Results:

    • Pooled threshold force values (dB re 1 micro Newton) were 53.2 for 1000 Hz, 56.8 with white noise, and 62.4 with speech noise.
    • Speech intelligibility scores ranged from 15% at 0 dB SL to 95% at 34 dB SL.
    • The slope of the intelligibility function decreased with increasing intensity.

    Conclusions:

    • The calibration signals (1000 Hz tone, white noise, speech noise) are appropriate for delivering speech via B-70-AA or B-71 bone vibrators.
    • Normal speech intelligibility functions via bone conduction resemble those obtained via air conduction.
    • These findings provide valuable data for audiological assessments and hearing aid fitting using bone vibrators.