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:: Volume 16, Issue 1 (5 2007) ::
aud 2007, 16(1): 25-35 Back to browse issues page
Study of denoising in TEOAE signals using an appropriate mother wavelet function
Habib Alizadeh Dizaji, Mohammad Djavad Abolhasani 1, Alireza Ahmadian, Yousef Salimpour
Abstract:   (6450 Views)

Background and Aim: Matching a mother wavelet to class of signals can be of interest in signal analysis and denoising based on wavelet multiresolution analysis and decomposition. As transient evoked otoacoustic emissions (TEOAES) are contaminated with noise, the aim of this work was to provide a quantitative approach to the problem of matching a mother wavelet to TEOAE signals by using tuning curves and to use it for analysis and denoising TEOAE signals. Approximated mother wavelet for TEOAE signals was calculated using an algorithm for designing wavelet to match a specified signal.
Materials and Methods: In this paper a tuning curve has used as a template for designing a mother wavelet that has maximum matching to the tuning curve. The mother wavelet matching was performed on tuning curves spectrum magnitude and phase independent of one another. The scaling function was calculated from the matched mother wavelet and by using these functions, lowpass and highpass filters were designed for a filter bank and otoacoustic emissions signal analysis and synthesis. After signal analyzing, denoising was performed by time windowing the signal time-frequency component.
Results: Aanalysis indicated more signal reconstruction improvement in comparison with coiflets mother wavelet and by using the purposed denoising algorithm it is possible to enhance signal to noise ratio up to dB.
Conclusion: The wavelet generated from this algorithm was remarkably similar to the biorthogonal wavelets. Therefore, by matching a biorthogonal wavelet to the tuning curve and using wavelet packet analysis, a high resolution time-frequency analysis for the otoacoustic emission signals is possible.

Keywords: transient evoked otoacoustic emissions, tuning curves, matching mother wavelets, multiresolution analysis, time windowing, denoising
Full-Text [PDF 463 kb]   (1496 Downloads)    
Type of Study: Research |
Received: 2007/02/8 | Accepted: 2007/10/8 | Published: 2013/10/7
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Volume 16, Issue 1 (5 2007) Back to browse issues page
شنوایی شناسی - دانشگاه علوم پزشکی تهران Bimonthly Audiology - Tehran University of Medical Sciences
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