Document Detail


Comparison of in-situ calibration methods for quantifying input to the middle ear.
MedLine Citation:
PMID:  20000925     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Sound pressure level in-situ measurements are sensitive to standing-wave pressure minima and have the potential to result in over-amplification with risk to residual hearing in hearing-aid fittings. Forward pressure level (FPL) quantifies the pressure traveling toward the tympanic membrane and may be a potential solution as it is insensitive to ear-canal pressure minima. Derivation of FPL is dependent on a Thevenin-equivalent source calibration technique yielding source pressure and impedance. This technique is found to accurately decompose cavity pressure into incident and reflected components in both a hard-walled test cavity and in the human ear canal through the derivation of a second sound-level measure termed integrated pressure level (IPL). IPL is quantified by the sum of incident and reflected pressure amplitudes. FPL and IPL were both investigated as measures of sound-level entering the middle ear. FPL may be a better measure of middle-ear input because IPL is more dependent on middle-ear reflectance and ear-canal conductance. The use of FPL in hearing-aid applications is expected to provide an accurate means of quantifying high-frequency amplification.
Authors:
James D Lewis; Ryan W McCreery; Stephen T Neely; Patricia G Stelmachowicz
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Validation Studies    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  126     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-12-16     Completed Date:  2010-02-24     Revised Date:  2013-05-31    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3114-24     Citation Subset:  IM    
Affiliation:
Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA. james-lewis@uiowa.edu
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MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation
Acoustics*
Adolescent
Algorithms
Audiometry, Pure-Tone
Auditory Threshold
Calibration*
Child
Ear Canal / physiology
Ear, Middle* / physiology
Electronics / instrumentation,  methods*
Hearing / physiology
Humans
Pressure*
Sound*
Young Adult
Grant Support
ID/Acronym/Agency:
R01-DC4300/DC/NIDCD NIH HHS; R01-DC8318/DC/NIDCD NIH HHS; T35-DC8757/DC/NIDCD NIH HHS
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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