High resolution time-frequency analysis of otoacoustic emissions

Article type: Research Article

Authors: Blinowska, K.J.^a | Durka, P.J.^a | Skierski, A.^a | Grandori, F.^b | Tognola, G.^b

Affiliations: [a] Laboratory of Medical Physics, Warsaw University, ul. Hoża 69, 00-681 Warszawa, Poland, http://info.fuw.edu.pl/~durka/med_ph.html | [b] CNR Centre of Biomedical Engineering, Polytechnic of Milan, Piazza L. da Vinci 32, 20133 Milan, Italy

Abstract: High resolution time-frequency analysis of OAE signals evoked by stimuli of different strength was performed by means of the Matching Pursuit algorithm. The method relies on adaptive decomposition of a signal into waveforms of well-defined frequency and time localization. Energy of OAE as a function of time and frequency was evaluated for stimuli strength of 35–80 dB SPL. Dynamic characteristics of the signal were constructed. For strong stimuli decrease of the power of high frequency components was found. Matching Pursuit proved to be a method which offers high resolution parametrisation of OAE in time-frequency space and provides excellent possibilities of investigation of the signal generation mechanisms.

Keywords: Otoacoustic emission, Matching Pursuit, time-frequency methods, Wigner distribution

DOI: 10.3233/THC-1997-5601

Journal: Technology and Health Care, vol. 5, no. 6, pp. 407-418, 1997