WIT Press

An Optimal High-pass Filtering Technique To Improve The Detectability Of Evoked Otoacoustic Emissions

Price

Free (open access)

Paper DOI

10.2495/BIO950591

Volume

2

Pages

8

Published

1995

Size

748 kb

Author(s)

G. Tognola, P. Ravazzani & F. Grandori

Abstract

Evoked otoacoustic emissions (EOAEs) are currently used as the most reliable test for hearing screening. The presence of emission is commonly detected by the visual inspection of the signals and the cross-correlation function between replicate responses recorded in the same conditions. Performances of these methods are greatly influenced by the residual noise level. Residual noise is often of low frequency and can be reduced by digital off-line filtering. For this purpose, an optimal high-pass filtering technique is proposed here. Cross- correlation between replicates of transient evoked otoacoustic emissions (TEOAEs) was used to determine the cut-off frequency that maximises the S/N ratio. This will be shown in a series of responses characterised by various S/N ratios. Data h

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