New spectral methods for analysis of source/filter characteristics of speech signals


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This study proposes a new spectral representation called the Zeros of Z-Transform (ZZT), which is an all-zero representation of the z-transform of the signal. In addition, new chirp group delay processing techniques are developed for analysis... Read More

This study proposes a new spectral representation called the Zeros of Z-Transform (ZZT), which is an all-zero representation of the z-transform of the signal. In addition, new chirp group delay processing techniques are developed for analysis of resonances of a signal. The combination of the ZZT representation with the chirp group delay processing algorithms provides a useful domain to study resonance characteristics of source and filter components of speech. Using the two representations, effective algorithms are developed for: source-tract decomposition of speech, glottal flow parameter estimation, formant tracking and feature extraction for speech recognition. The ZZT representation is mainly important for theoretical studies. Studying the ZZT of a signal is essential to be able to develop effective chirp group delay processing methods. Therefore, first the ZZT representation of the source-filter model of speech is studied for providing a theoretical background. We confirm through ZZT representation that anti-causality of the glottal flow signal introduces mixed-phase characteristics in speech signals. The ZZT of windowed speech signals is also studied since windowing cannot be avoided in practical signal processing algorithms and the effect of windowing on ZZT representation is drastic. We show that separate patterns exist in ZZT representations of windowed speech signals for the glottal flow and the vocal tract contributions. A decomposition method for source-tract separation is developed based on these patterns in ZZT. We define chirp group delay as group delay calculated on a circle other than the unit circle in z-plane. The need to compute group delay on a circle other than the unit circle comes from the fact that group delay spectra are often very noisy and cannot be easily processed for formant tracking purposes (the reasons are explained through ZZT representation). In this thesis, we propose methods to avoid such problems by modifying the ZZT of a signal and further computing the chirp group delay spectrum. New algorithms based on processing of the chirp group delay spectrum are developed for formant tracking and feature estimation for speech recognition. The proposed algorithms are compared to state-of-the-art techniques. Equivalent or higher efficiency is obtained for all proposed algorithms. The theoretical parts of the thesis further discuss a mixed-phase model for speech and phase processing problems in detail. Index Terms—spectral representation, source-filter separation, glottal flow estimation, formant tracking, zeros of z-transform, group delay processing, phase processing.


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Specifications


Publisher
Presses universitaires de Louvain
Author
Baris Bozkurt,
Edited by
Similar,
Collection
SIMILAR
Language
English
BISAC Subject Heading
COM000000 COMPUTERS
Onix Audience Codes
06 Professional and scholarly
CLIL (Version 2013-2019)
3238 Réseaux et Télécommunications
Title First Published
2006
Type of Work
Thesis

Paperback


Publication Date
17 January 2008
ISBN-13
9782804158231
Extent
Main content page count : 572
Code
DUC205798001
Dimensions
17.5 x 24 cm
Weight
981 grams
List Price
32.30 €
ONIX XML
Version 2.1, Version 3

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Contents


Préface

Chapitre 1 La technologie
Chapitre 2 La maximisation du profit
Chapitre 3 La fonction du profit
Chapitre 4 La minimisation du coût
Chapitre 5 La fonction du coût
Chapitre 6 La dualité
Chapitre 7 La maximisation de l'utilité
Chapitre 8 Le choix
Chapitre 9 La demande
Chapitre 10 Le surplus du consommateur
Chapitre 11 L'incertitude
Chapitre 12 L'analyse économétrique
Chapitre 13 Les marché concurrentiels
Chapitre 14 Le monopole
Chapitre 15 La théorie des jeux
Chapitre 16 L'oligopole
Chapitre 17 L'échange
Chapitre 18 La production
Chapitre 19 Le temps
Chapitre 20 Les marchés d'actif
Chapitre 21 L'analyse de l'équilibre
Chapitre 22 L'analyse du bien-être
Chapitre 23 Les biens publics
Chapitre 24 Les externalités
Chapitre 25 L'information
Chapitre 26 Mathématique
Chapitre 27 L'optimisation

Bibliographie
Réponses
Index