An assessment of a conical horn waveguide to represent the human eardrum

Taylor N. Fields, Lucia Schnetzer, Eileen Brister, Charles Yates, Robert H. Withnell

Research output: Contribution to journalArticle

Abstract

This study examined a model of the acoustic input impedance of the ear that includes a waveguide model of the eardrum. The eardrum was modeled as a lossless conical-horn with rigid walls. The ear canal was modeled as a one-dimensional lossy transmission line. The output impedance of the eardrum, the middle ear, and the cochlea, was modeled as a circuit analog. The model was fit to acoustic input impedance data from human ears using a nonlinear least-squares fit. The impact of a conical-horn shape for the eardrum was quantified by comparison with the eardrum modeled as a near-flat surface. The model provided a good match to the data over the frequency range examined. A conical-horn model of the human eardrum provided gain at high frequencies, most notably above 1-2 kHz, with a broader middle-ear frequency response. This finding may suggest that eardrum shape plays an important role in sound transmission to the cochlea.

Original languageEnglish (US)
Article number185401
JournalJournal of Physics D: Applied Physics
Volume51
Issue number18
DOIs
StatePublished - Apr 13 2018
Externally publishedYes

Fingerprint

eardrums
Waveguides
waveguides
Acoustic impedance
ear
middle ear
cochlea
impedance
Acoustics
Canals
Frequency response
analog circuits
canals
Electric lines
acoustics
sound transmission
Acoustic waves
frequency response
transmission lines
flat surfaces

Keywords

  • bioacoustics
  • biomechanics
  • eardrum
  • model
  • waveguides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

An assessment of a conical horn waveguide to represent the human eardrum. / Fields, Taylor N.; Schnetzer, Lucia; Brister, Eileen; Yates, Charles; Withnell, Robert H.

In: Journal of Physics D: Applied Physics, Vol. 51, No. 18, 185401, 13.04.2018.

Research output: Contribution to journalArticle

Fields, Taylor N. ; Schnetzer, Lucia ; Brister, Eileen ; Yates, Charles ; Withnell, Robert H. / An assessment of a conical horn waveguide to represent the human eardrum. In: Journal of Physics D: Applied Physics. 2018 ; Vol. 51, No. 18.
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