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Blocked Probe Fit

Source
The information presented here is based on clinical examples as well as modeled patterns. Text and accompanying. Absorbance sketch is authored by Navid Shahnaz, PhD, Aud, Associate Professor of Audiology in the School of Audiology & Speech Sciences at the University of British Columbia (UBC).

Note
Absorbance measures under more or less blocked conditions will vary. The displayed Absorbance pattern is a sketched example only.

Absorbance characteristics to look for:

  • The Absorbance will be very low across the frequency range
  • Depending on the degree of blockage against the ear canal, the Absorbance might be more or less jerky

Sketched example of absorbance characteristics
Sketched example

Suggested reading
Effects of Middle-Ear Disorders on Power Reflectance Measured in Cadaveric Ear Canals, Voss, Susan E., Merchant, Gabrielle R.,Horton, Nicholas J., Ear & Hearing. 33(2):195-208, March/April 2012.

Acoustic Immittance Measures, Basic and Advanced Practice, 2013, Lisa Hunter, Phd, FAAA, Navid Shahnaz, PhD, Aud. (C), Plural Publishing. ISBN10: 1-59756-437-0, ISBN13: 978-1-59756-437-3.

May 2015
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