title: Acoustic Immittance, Absorbance, and Reflectance in the Human Ear Canal.
abstract: 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.
authors: The Eliason Professor of Otology and Laryngology, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts.
authors: John J
authors: JJ
authors: Rosowski
authors: Department of Communication Sciences and Disorders, Frances Searle Building, Northwestern University, Evanston, Illinois.
authors: Laura Ann
authors: LA
authors: Wilber
keywords: Admittance; immittance; impedance; stapes reflex; tympanometry