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Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
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Published on: December 20, 2024

A free-field method to calibrate bone conduction transducers.

Kimberly A Pollard1, Phuong K Tran, Tomasz R Letowski

  • 1U. S. Army Research Laboratory, 520 Mulberry Point Road, Aberdeen Proving Ground, Maryland 21005-5425, USA. kpollard@ucla.edu

The Journal of the Acoustical Society of America
|February 1, 2013
PubMed
Summary

A new human-centered method calibrates bone conduction transducers, offering flexibility across devices and skull locations. This approach provides reliable perceptual data, unlike current standards.

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Acoustics

Background:

  • Bone conduction communication systems utilize diverse transducers with varying properties, requiring adaptable calibration methods.
  • Existing audiometric standards and mechanical couplers lack flexibility and human validity for bone transducer calibration.
  • A need exists for a reliable, human-centered calibration procedure applicable to various transducers and skull locations.

Purpose of the Study:

  • To develop and validate a flexible, human-centered bone transducer calibration procedure.
  • To compare calibration results with existing mechanical coupler methods.
  • To assess the reliability and applicability of the new method across different transducer models and skull locations.

Main Methods:

  • A novel calibration procedure analogous to free-field methods was investigated.
  • Participants adjusted bone transducers to match perceived loudness of loudspeaker-presented noise bands across frequencies (125-12,500 Hz).
  • Testing involved two transducer models and two skull locations, assessing intra- and inter-subject reliability.

Main Results:

  • The developed procedure demonstrated high intra- and inter-subject reliability.
  • Calibration data varied significantly based on transducer model and skull location.
  • Results differed from those obtained using mechanical couplers, highlighting the limitations of the latter.

Conclusions:

  • The proposed human-centered calibration method is flexible for different bone transducer models and skull locations.
  • This procedure requires only basic equipment and yields direct perceptual data.
  • The method offers a more reliable and human-valid alternative to existing calibration standards.