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Related Experiment Videos

High-frequency audiometry. Masking in electric bone-conduction audiometry.

H Löppönen1

  • 1Department of Otolaryngology, University of Oulu, Finland.

Scandinavian Audiology
|January 1, 1992
PubMed
Summary

Masking electric bone-conduction (EBC) hearing tests with air-conduction signals is now possible. This allows for accurate monaural threshold measurements, crucial for understanding high-frequency hearing loss.

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Area of Science:

  • Audiology
  • Hearing Science
  • Biomedical Engineering

Background:

  • The 'electric bone-conduction' (EBC) audiometer (Audimax 500) is a tool for high-frequency (HF) hearing assessment.
  • Current EBC stimulation is binaural, lacking a commercial masking method for monaural threshold determination.

Purpose of the Study:

  • To investigate the efficacy of masking EBC signals using air-conduction noise.
  • To determine if EBC measurements can reflect monaural hearing thresholds.
  • To assess cross-hearing effects and binaural summation in HF EBC audiometry.

Main Methods:

  • White noise masking via a Madsen OB822 audiometer and Sony MDR-V4 earphones was employed.
  • Masking and cross-hearing were evaluated in 8 unilaterally deaf subjects.
  • The masking procedure was tested on 104 young normal-hearing subjects.

Main Results:

  • EBC signals were successfully masked by air-conduction signals, confirming monaural threshold measurement.
  • Minimum masking levels ranged from 50-60 dB SPL in the HF range.
  • No significant cross-hearing issues were observed with the specified earphones in the HF range.
  • Masked EBC thresholds were slightly poorer (average 2.6 dB) than binaural thresholds, indicating binaural summation.

Conclusions:

  • Air-conduction masking effectively enables monaural EBC hearing threshold measurements.
  • The developed masking procedure is reliable for HF EBC audiometry.
  • Binaural summation is a factor in binaural EBC threshold determination.

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