Acoustic immittance, absorbance, and reflectance in the human ear canal

John J. Rosowski, Laura Ann Wilber*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Ear canal measurements of acoustic immittance (a term that groups impedance and its inverse, admittance) and the related quantities of acoustic reflectance and power absorbance have been used to assess auditory function and aid in the differential diagnosis of conductive hearing loss for over 50 years. The change in such quantities after stimulation of the acoustic reflex also has been used in diagnosis. In this article, we define these quantities, describe how they are commonly measured, and discuss appropriate calibration procedures and standards necessary for accurate immittance/reflectance measurements.

Original languageEnglish (US)
Pages (from-to)11-28
Number of pages18
JournalSeminars in Hearing
Issue number1
StatePublished - Feb 2015


  • Admittance
  • immittance
  • impedance
  • stapes reflex
  • tympanometry

ASJC Scopus subject areas

  • Speech and Hearing


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