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Quasilinear reflection as a possible mechanism for suppressor-induced otoacoustic emission.
- Source :
-
Journal of the Acoustical Society of America . Dec2016, Vol. 140 Issue 6, p4193-4203. 11p. - Publication Year :
- 2016
-
Abstract
- A frequency-domain iterative approach is developed to compute the change in characteristic impedance in the cochlea due to the presence of a suppressor tone. Based on this approach, a small transient wave passing by the best place (BP) of the suppressor is predicted to be partially reflected because of the suppressor-induced impedance variation. This computational approach is tested on a nonlinear model of cochlear mechanics [Liu, J. Acoust. Soc. Am. 136, 1788-1796 (2014)]. When a 9-kHz suppressor at 60 dB sound pressure level is delivered to the model, the characteristic impedance decreases by ~20% near its BP. This localized impedance mismatch causes a forward-going wave at 4 kHz to reflect partially, and the magnitude of the reflected component is about -18 dB relative to the forward-going component near the stapes. The reflected components eventually emit from the cochlea to the ear canal, and the predicted amplitude of tone-burst evoked otoacoustic emissions (OAEs) agrees well with time-domain simulation. The present results suggest that, while the "suppressor" is meant to suppress the OAEs in experiments, its very presence might create an otherwise non-existing emission component via nonlinear scattering when its frequency is higher than that of the probe. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00014966
- Volume :
- 140
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Journal of the Acoustical Society of America
- Publication Type :
- Academic Journal
- Accession number :
- 120512871
- Full Text :
- https://doi.org/10.1121/1.4968879