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Swept-tone transient-evoked otoacoustic emissions
Christopher L Bennett1, Özcan Özdamar
1Department of Biomedical Engineering, College of Engineering, University of Miami, 1251 Memorial Drive, 219A Coral Gables, Florida 33146, USA.
The Journal of the Acoustical Society of America
|October 26, 2010
Summary
A new swept-tone stimulus offers a faster and more effective way to measure transient-evoked otoacoustic emissions (TEOAEs). This method improves signal quality and removes unwanted noise, aiding in the assessment of cochlear function.
Area of Science:
- Audiology
- Otoacoustic Emissions
- Cochlear Physiology
Background:
- Transient-evoked otoacoustic emissions (TEOAEs) assess cochlear function by measuring inner ear responses to sound.
- Conventional TEOAE acquisition uses brief stimuli like clicks, averaging responses near the eardrum.
- Existing methods can be affected by noise and spontaneous otoacoustic emissions.
Purpose of the Study:
- Introduce a novel long-duration, frequency-swept tone stimulus for TEOAE acquisition.
- Evaluate the efficacy of swept-tone analysis for recovering and analyzing TEOAEs.
- Compare swept-tone TEOAEs with traditional click-evoked TEOAEs.
Main Methods:
- Employed a frequency-swept tone stimulus for TEOAE recording.
- Utilized time-compressed signal analysis by convolving swept-tone responses with a time-reversed signal.
- Separated linear TEOAEs from higher-order nonlinear otoacoustic emission responses.
Main Results:
- Demonstrated comparable phase and time-frequency properties between swept-tone and click-evoked TEOAEs.
- Achieved a 6 dB improvement in signal-to-noise ratio with swept-tone acquisition, reducing testing time.
- Successfully removed synchronized spontaneous otoacoustic emissions from recordings.
Conclusions:
- Swept-tone stimulus acquisition provides a beneficial alternative for TEOAE measurement.
- This method enhances signal quality, reduces testing time, and offers improved noise handling.
- The analysis allows for direct comparison with stimulus-frequency otoacoustic emissions.
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