NDLI: Glottal flow derivative modeling with the wavelet smoothed excitation

Content Provider	IEEE Xplore Digital Library
Author	Lobo, A.P.
Copyright Year	2001
Description	Author affiliation: The Keytech Centre, Ericsson Mobile Commun. (UK) Ltd., Basingstoke, UK (Lobo, A.P.)
Abstract	This paper discusses a method for estimating glottal flow derivative model parameters using wavelet-smoothed excitation. The excitation is first estimated using the weighted recursive least squares with variable forgetting factor algorithm. The raw excitation is then smoothed by applying a discrete wavelet transform (DWT) using biorthogonal quadrature filters, and a thresholding operation carried out on the DWT amplitude coefficients, followed by an inverse DWT. The pitch period and the instant of glottal closure (IGC) are estimated from the wavelet-smoothed excitation. A six-parameter glottal flow derivative model consisting of three amplitude and three timing parameters is aligned with the IGC and optimized by minimum square error fitting to the speech waveform. The optimization is done by the method of simulated annealing. The. model is then used to reestimate the vocal-tract filter parameters in an ARX procedure followed by further stages of voice source-vocal tract estimation. The results of analysis of speech utterances from the BK TIMIT database are presented.
Sponsorship	IEEE Signal Process. Soc
Starting Page	861
Ending Page	864
File Size	345539
Page Count	4
File Format	PDF
ISBN	0780370414
ISSN	15206149
DOI	10.1109/ICASSP.2001.941051
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-05-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Discrete wavelet transforms Filters Optimization methods Simulated annealing Speech analysis Recursive estimation Least squares approximation Shape Pulse shaping methods Speech coding
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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