Adaptive Wiener Filtering for Improved Acquisition of Distortion Product Otoacoustic Emissions

Authors: Özdamar Ö.¹; Delgado R.E.²; Rahman S.²; Lopez C.²

Source: Annals of Biomedical Engineering, Volume 26, Number 5, September 1998 , pp. 883-891(9)

Publisher: Springer

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Abstract:

An innovative acoustic noise canceling method using adaptive Wiener filtering (AWF) was developed for improved acquisition of distortion product otoacoustic emissions (DPOAEs). The system used one microphone placed in the test ear for the primary signal. Noise reference signals were obtained from three different sources: (a) pre-stimulus response from the test ear microphone, (b) post-stimulus response from a microphone placed near the head of the subject and (c) post-stimulus response obtained from a microphone placed in the subject’s nontest ear. In order to improve spectral estimation, block averaging of a different number of single sweep responses was used. DPOAE data were obtained from 11 ears of healthy newborns in a well-baby nursery of a hospital under typical noise conditions. Simultaneously obtained recordings from all three microphones were digitized, stored and processed off-line to evaluate the effects of AWF with respect to DPOAE detection and signal-to-noise ratio (SNR) improvement. Results show that compared to standard DPOAE processing, AWF improved signal detection and improved SNR. © 1998 Biomedical Engineering Society. PAC98: 4364Jb, 4360-c, 8790+y

Keywords: Hearing testing; Adaptive noise canceling; Adaptive Wiener filtering; Otoacoustic emissions

Document Type: Research article

DOI: http://dx.doi.org/10.1114/1.111

Affiliations: 1: University of Miami, Departments of Biomedical Engineering, Otolaryngology, and Pediatrics, Coral Gables, FL. Intelligent Hearing Systems Corporation, Miami, FL 2: Intelligent Hearing Systems Corporation, Miami, FL

Publication date: 1998-09-01