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Related Concept Videos

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Stimulus and transducer effects on threshold.

Gregory A Flamme1, Kyle Geda, Kara D McGregor

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|December 31, 2014
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Summary

New circumaural earphones (HDA200) offer improved audiometric testing reliability compared to older supra-aural models (TDH-39P). Noise bands, particularly equivalent rectangular bands (ERBs), enhance test reliability for hearing monitoring.

Keywords:
Audiometrynoise-induced hearing lossoccupational healthreliability

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Area of Science:

  • Audiology
  • Hearing Science
  • Biomedical Engineering

Background:

  • Traditional audiometric testing often relies on supra-aural earphones like the Telephonics TDH-39P.
  • Advancements in headphone technology, such as circumaural designs like the Sennheiser HDA200, warrant investigation for their impact on audiological assessments.
  • Understanding the reliability of different stimuli (pure tone, noise bands) with new equipment is crucial for accurate hearing evaluations.

Purpose of the Study:

  • To compare the reliability of hearing thresholds obtained with Sennheiser HDA200 circumaural earphones against Telephonics TDH-39P supra-aural earphones.
  • To evaluate the performance of pure tone, equivalent rectangular noise bands (ERBs), and 1/3 octave noise bands with the HDA200 earphones.
  • To assess the impact of stimulus bandwidth on the reliability and frequency-specificity of audiometric measurements.

Main Methods:

  • Audiometric thresholds were measured six times within 10 days for 49 adults with varying threshold reliability.
  • Testing involved Sennheiser HDA200 and Telephonics TDH-39P earphones using pure tones and different noise band stimuli.
  • Data were analyzed to compare the reliability and consistency of thresholds across different earphone types and stimulus conditions.

Main Results:

  • Sennheiser HDA200 earphones demonstrated equal or superior reliability for pure-tone thresholds compared to TDH-39P earphones.
  • Noise band thresholds showed improved reliability with broader bandwidths, outperforming pure-tone thresholds in some cases.
  • Frequency-specificity decreased with stimulus bandwidths exceeding one ERB, potentially hindering the detection of narrow-frequency hearing changes.

Conclusions:

  • Circumaural earphones, specifically the HDA200, offer enhanced reliability for audiometric testing over TDH-39P earphones.
  • Noise bands, particularly ERB noises, are recommended as effective stimuli for reliable audiometric monitoring.
  • Careful consideration of stimulus bandwidth is necessary to balance reliability and frequency specificity in hearing assessments.