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Related Experiment Videos

Force threshold for hearing by direct bone conduction

P Carlsson1, B Håkansson, A Ringdahl

  • 1Department of Applied Electronics, Chalmers University of Technology, Göteborg, Sweden.

The Journal of the Acoustical Society of America
|February 1, 1995
PubMed
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Researchers established a standard for direct bone conduction (dbc) hearing aid force thresholds. This study provides a reference equivalent threshold force level for dbc, crucial for hearing aid development.

Area of Science:

  • Audiology
  • Biomedical Engineering
  • Hearing Science

Background:

  • Bone-anchored hearing aids utilize direct bone conduction (dbc) via a titanium implant and coupling.
  • A standardized audiometric zero for dbc force threshold is currently lacking, hindering consistent measurements.
  • Previous methods for estimating the relationship between bone conduction (bc) and dbc thresholds have limitations.

Purpose of the Study:

  • To determine the direct bone conduction (dbc) force threshold for normal-hearing subjects.
  • To establish a reference equivalent threshold force level for dbc measurements.
  • To investigate the relationship between dbc force threshold and bone conduction (bc) force threshold.

Main Methods:

  • Development and utilization of a skull simulator (TU-1000) to measure the output-force level of dbc transducers in situ.

Related Experiment Videos

  • The skull simulator accurately replicates the mechanical point impedance of the human skull.
  • Estimation of a linear relationship between the dbc force threshold and the bc force threshold.

    • Main Results:

    • The study successfully estimated a linear relationship between dbc and bc force thresholds.
    • The findings align well with two previously reported estimates.
    • A reference equivalent threshold force level for dbc has been proposed based on the study's findings.

    Conclusions:

    • The developed skull simulator provides a reliable method for measuring dbc transducer output.
    • The estimated linear relationship offers a valuable reference for standardizing dbc audiometry.
    • The proposed reference equivalent threshold force level for dbc is recommended for future use in hearing aid research and development.