New Spectral Methods for Analysis of Source/filter Characteristics of Speech Signals

New Spectral Methods for Analysis of Source/filter Characteristics of Speech Signals
Author :
Publisher : Presses univ. de Louvain
Total Pages : 125
Release :
ISBN-10 : 9782874630132
ISBN-13 : 2874630136
Rating : 4/5 (136 Downloads)

Book Synopsis New Spectral Methods for Analysis of Source/filter Characteristics of Speech Signals by : Baris Bozkurt

Download or read book New Spectral Methods for Analysis of Source/filter Characteristics of Speech Signals written by Baris Bozkurt and published by Presses univ. de Louvain. This book was released on 2006 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.


New Spectral Methods for Analysis of Source/filter Characteristics of Speech Signals Related Books

New Spectral Methods for Analysis of Source/filter Characteristics of Speech Signals
Language: en
Pages: 125
Authors: Baris Bozkurt
Categories: Computers
Type: BOOK - Published: 2006 - Publisher: Presses univ. de Louvain

GET EBOOK

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. I
Progress in Nonlinear Speech Processing
Language: en
Pages: 280
Authors: Yannis Stylianou
Categories: Computers
Type: BOOK - Published: 2007-03-30 - Publisher: Springer Science & Business Media

GET EBOOK

This book constitutes of the major results of the EU COST (European Cooperation in the field of Scientific and Technical Research) Action 277: NSP, Nonlinear Sp
Proceedings of the Conference on the Assessment of Vocal Pathology
Language: en
Pages: 178
Authors: Christy L. Ludlow
Categories: Speech disorders
Type: BOOK - Published: 1981 - Publisher:

GET EBOOK

Scientific and Technical Aerospace Reports
Language: en
Pages: 704
Authors:
Categories: Aeronautics
Type: BOOK - Published: 1995 - Publisher:

GET EBOOK

DAFX - Digital Audio Effects
Language: en
Pages: 568
Authors: Udo Zölzer
Categories: Technology & Engineering
Type: BOOK - Published: 2002-04-17 - Publisher: John Wiley & Sons

GET EBOOK

* Digital Audio Effects (DAFX) covers the use of digital signal processing and its applications to sounds * Discusses digital audio effects from both an introdu