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Engineering Brief

Ellipsoidal Reflector for Measuring Oto-Acoustic Emissions

Authors: Pulkki, Ville; Heiskanen, Vesa; Epp, Bastian

AES Convention 137 · Paper 181 · October 2014

Abstract

A truncated prolate ellipsoidal reflector having the ear canal of a listener at one focal point and large-diaphragm low-noise microphone at the other focal point is proposed for free-field recordings of oto-acoustic emissions. A prototype reflector consisting of three pieces is presented, which enables measuring the response of the system with different truncations. The response of the system is measured with a miniature loudspeaker, and proof-of-concept measurements of oto-acoustic emissions are presented. The effect of truncation and other physical parameters to the performance of the system are discussed.

Details

Published in
AES Convention 137
AES Convention
137
Paper number
181
Publication date
October 6, 2014
Affiliation
Aalto University, Espoo, Finland; Technical University of Denmark, Denmark (See document for exact affiliation information.)
Type
Engineering Brief