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Wavelet-type analysis of transient-evoked otoacoustic emissions
E G Pasanen1, J D Travis, R J Thornhill
1Department of Psychology, University of Texas, Austin 78712.
Biomedical Sciences Instrumentation
|January 1, 1994
Summary
Transient-evoked otoacoustic emissions (TEOAEs) are weak cochlear responses to sound. A new wavelet-like analysis reveals TEOAE energy is concentrated between 800-2000 Hz, aiding hearing loss diagnosis.
Area of Science:
- Otoacoustic Emissions
- Auditory Neuroscience
- Signal Processing
Background:
- Transient-evoked otoacoustic emissions (TEOAEs) are low-level sounds generated by the cochlea in response to acoustic stimuli.
- TEOAE analysis offers a noninvasive method for assessing cochlear function and diagnosing hearing loss.
- Traditional Fast Fourier Transform (FFT) methods struggle with the nonstationary nature of TEOAE signals.
Purpose of the Study:
- To investigate the application of a novel wavelet-like analysis for TEOAE data.
- To determine the frequency distribution and temporal characteristics of TEOAEs.
- To evaluate the effect of quinine on TEOAEs using this new analytical approach.
Main Methods:
- Collected a database of TEOAEs from human subjects.
- Administered quinine to a subset of subjects to study its effects.
- Employed a wavelet-like analysis using equal-bandwidth filters for signal processing.
Main Results:
- The analysis revealed that TEOAE energy is primarily concentrated within the 800-2000 Hz frequency range.
- This method effectively examined the time progression of different frequency bands within click-evoked emissions.
- Observed changes in TEOAEs in subjects administered quinine.
Conclusions:
- A wavelet-like filtering approach provides valuable insights into TEOAE characteristics.
- This analysis method is effective for studying the frequency and temporal aspects of TEOAEs.
- The findings support the utility of this technique for understanding cochlear function and drug effects on hearing.