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Related Experiment Videos

Bone vibrator placement and the cancellation technique.

J J Dempsey1, H Levitt

  • 1Department of Speech, Communication Sciences & Theater, St. John's University, Jamaica, New York.

Ear and Hearing
|August 1, 1990
PubMed
Summary

Bone vibrator placement affects phase, not amplitude, in bone conduction sensitivity tests. Precise measurements are achievable using a cancellation technique, despite intersubject variations in phase response.

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Area of Science:

  • Audiology
  • Bioacoustics
  • Hearing Science

Background:

  • Accurate bone conduction sensitivity measurement is crucial for diagnosing hearing loss.
  • Bone vibrator placement is a known source of variability in these measurements.
  • Standardized placement protocols are lacking, impacting test reliability.

Purpose of the Study:

  • To investigate the impact of bone vibrator position on the amplitude and phase of bone-conducted signals.
  • To evaluate the precision of a cancellation technique for bone conduction measurements.
  • To identify optimal bone vibrator placement for reliable audiometric testing.

Main Methods:

  • Utilized a cancellation technique to measure bone-conducted signals.
  • Compared bone vibrator placement at the center of the forehead.

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  • Acoustically cancelled the bone vibrator signal with an earphone signal at equal amplitude and opposite phase.

    • Main Results:

    • Received signal amplitude showed no significant variation with bone vibrator position near the forehead center.
    • Received signal phase was highly sensitive to bone vibrator position.
    • Significant intersubject differences were observed in phase variation relative to vibrator position.

    Conclusions:

    • Bone vibrator position critically influences the phase, but not amplitude, of bone-conducted signals.
    • The cancellation technique offers high precision for bone conduction measurements.
    • Further research is needed to standardize bone vibrator placement for improved diagnostic accuracy.