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.

Authors: Pulkki, Ville; Heiskanen, Vesa; Epp, Bastian
Affiliations: Aalto University, Espoo, Finland; Technical University of Denmark, Denmark(See document for exact affiliation information.)
AES Convention: 137 (October 2014) eBrief:181
Publication Date: October 7, 2014

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