Procedures for ambient-pressure and tympanometric tests of aural acoustic reflectance and admittance in human infants and adults

Douglas H Keefe, Lisa L. Hunter, M. Patrick Feeney, Denis F. Fitzpatrick

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Procedures are described to measure acoustic reflectance and admittance in human adult and infant ears at frequencies from 0.2 to 8 kHz. Transfer functions were measured at ambient pressure in the ear canal, and as down- or up-swept tympanograms. Acoustically estimated ear-canal area was used to calculate ear reflectance, which was parameterized by absorbance and group delay over all frequencies (and pressures), with substantial data reduction for tympanograms. Admittance measured at the probe tip in adults was transformed into an equivalent admittance at the eardrum using a transmission-line model for an ear canal with specified area and ear-canal length. Ear-canal length was estimated from group delay around the frequency above 2 kHz of minimum absorbance. Illustrative measurements in ears with normal function are described for an adult, and two infants at 1 month of age with normal hearing and a conductive hearing loss. The sensitivity of this equivalent eardrum admittance was calculated for varying estimates of area and length. Infant-ear patterns of absorbance peaks aligned in frequency with dips in group delay were explained by a model of resonant canal-wall mobility. Procedures will be applied in a large study of wideband clinical diagnosis and monitoring of middle-ear and cochlear function.

Original languageEnglish (US)
Pages (from-to)3625-3653
Number of pages29
JournalJournal of the Acoustical Society of America
Volume138
Issue number6
DOIs
StatePublished - Dec 1 2015

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ear
electrical impedance
canals
reflectance
acoustics
eardrums
middle ear
Ear
Aural
Acoustics
Reflectance
auditory defects
data reduction
hearing
transfer functions
transmission lines
Canals
broadband
probes
sensitivity

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Arts and Humanities (miscellaneous)

Cite this

Procedures for ambient-pressure and tympanometric tests of aural acoustic reflectance and admittance in human infants and adults. / Keefe, Douglas H; Hunter, Lisa L.; Patrick Feeney, M.; Fitzpatrick, Denis F.

In: Journal of the Acoustical Society of America, Vol. 138, No. 6, 01.12.2015, p. 3625-3653.

Research output: Contribution to journalArticle

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