Document Detail

Nonlinearity in eardrum vibration as a function of frequency and sound pressure.
MedLine Citation:
PMID:  20026266     Owner:  NLM     Status:  MEDLINE    
It is generally accepted that the middle ear acts mainly as a linear system for sound pressures up to 130 dB SPL in the auditory frequency range. However, at quasi-static pressure loads a strong nonlinear response has been demonstrated. Consequently, small nonlinear distortions may also be present in the middle ear response in the auditory frequency range. A new measurement method was developed to quickly determine vibration response, nonlinear distortions and noise level of acoustically driven biomechanical systems. Specially designed multisines are used for the excitation of the test system. The method is applied on a gerbil eardrum for sound pressures ranging from 90 to 120 dB SPL and for frequencies ranging from 125 Hz to 16 kHz. The experiments show that nonlinear distortions rise above noise level at a sound pressure of 96 dB SPL, and they grow as sound pressure increases. Post-mortem changes in the middle ear influence the nonlinear distortions rapidly until a stabilization occurs after approximately 3h.
J R M Aerts; J J J Dirckx
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2009-12-21
Journal Detail:
Title:  Hearing research     Volume:  263     ISSN:  1878-5891     ISO Abbreviation:  Hear. Res.     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-05-10     Completed Date:  2010-08-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7900445     Medline TA:  Hear Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  26-32     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2009 Elsevier B.V. All rights reserved.
Laboratory of BioMedical Physics, University of Antwerp, Antwerp, Belgium.
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MeSH Terms
Acoustic Impedance Tests
Acoustic Stimulation
Cochlea / physiology
Gerbillinae / physiology
Hearing / physiology
Nonlinear Dynamics
Postmortem Changes
Tympanic Membrane / physiology*

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