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Related Experiment Videos

Hearing thresholds, threshold repeatability, and attenuation values for passive noise-reducing earphone enclosures

T Frank1, A C Greer, D M Magistro

  • 1Department of Communication Disorders, Penn State University, University Park 16802, USA. taf1@psu.edu

American Industrial Hygiene Association Journal
|November 28, 1997
PubMed
Summary

Passive noise-reducing earphone enclosures do not meet audiology standards for hearing testing in noisy environments. These enclosures showed poorer threshold repeatability and inadequate sound attenuation, making them unsuitable for clinical use.

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Area of Science:

  • Audiology
  • Hearing Science
  • Noise Reduction Technology

Background:

  • Passive noise-reducing earphone enclosures are designed to mitigate ambient noise masking during hearing tests.
  • Evaluating their efficacy is crucial for accurate hearing threshold determination in high-noise environments.

Purpose of the Study:

  • To assess normal hearing threshold levels, threshold repeatability, and attenuation values of four passive noise-reducing earphone enclosures.
  • To compare the performance of these enclosures against standard supra-aural earphones.

Main Methods:

  • Study I: Measured hearing thresholds (500-6000 Hz) in 30 adults across four sessions for each enclosure and a supra-aural earphone.
  • Study II: Determined real-ear attenuation values using 24 adults for each enclosure.

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Main Results:

  • Audiocup and Auraldome II showed similar thresholds and repeatability to supra-aural earphones, but with less low-frequency attenuation.
  • AudioMate and Madsen ME-70 exhibited higher thresholds and poorer repeatability than supra-aural earphones.
  • None of the tested enclosures met all requirements for hearing testing in high ambient noise.

Conclusions:

  • Passive noise-reducing earphone enclosures are not recommended for hearing testing due to inadequate performance.
  • Enclosure coupling to the ear and head significantly impacts sound attenuation and threshold reliability.