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Alternative ear-canal measures related to absorbance
Stephen T Neely1, Stefan Stenfelt, Kim S Schairer
1Department of Hearing Research, Boys Town National Research Hospital, Omaha, Nebraska 68131, USA.
Ear and Hearing
|August 1, 2013
Summary
Several alternative ear-canal measures, including sound intensity and reflectance, offer advanced insights beyond traditional absorbance. These methods improve accuracy in auditory research and diagnostics.
Area of Science:
- Audiology
- Acoustics
- Bioacoustics
Background:
- Traditional ear-canal absorbance measurements require a Thévenin-equivalent sound source.
- Alternative measures like sound intensity level and reflectance are being explored.
Purpose of the Study:
- To introduce and compare alternative ear-canal measures to absorbance.
- To highlight the potential benefits of these novel measures for auditory research and diagnostics.
Main Methods:
- Comparison of sound intensity level, forward pressure level, time-domain ear-canal reflectance, and cochlear reflectance with absorbance.
- Analysis of wideband stimuli and ear-canal sound pressure recordings.
Main Results:
- Sound intensity and forward pressure levels reduce calibration errors from standing waves compared to sound pressure level.
- Time-domain ear-canal reflectance shows potential for estimating ear-canal geometry and assessing middle ear pathology.
- Cochlear reflectance provides inner ear information akin to otoacoustic emissions with potential interpretive advantages.
Conclusions:
- Alternative ear-canal measures offer distinct advantages over traditional absorbance.
- These measures enhance the accuracy and scope of auditory assessments, from behavioral thresholds to inner ear diagnostics.
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