Comparison of in-situ calibration methods for quantifying input to the middle ear

James Lewis, Ryan W. McCreery, Stephen T. Neely, Patricia G. Stelmachowicz

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)3114-3124
Number of pages11
JournalJournal of the Acoustical Society of America
Volume126
Issue number6
DOIs
StatePublished - Dec 29 2009

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middle ear
canals
ear
hearing
Middle Ear
In Situ
Calibration
derivation
cavities
acoustics
sound pressure

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

Comparison of in-situ calibration methods for quantifying input to the middle ear. / Lewis, James; McCreery, Ryan W.; Neely, Stephen T.; Stelmachowicz, Patricia G.

In: Journal of the Acoustical Society of America, Vol. 126, No. 6, 29.12.2009, p. 3114-3124.

Research output: Contribution to journalArticle

Lewis, James ; McCreery, Ryan W. ; Neely, Stephen T. ; Stelmachowicz, Patricia G. / Comparison of in-situ calibration methods for quantifying input to the middle ear. In: Journal of the Acoustical Society of America. 2009 ; Vol. 126, No. 6. pp. 3114-3124.
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