Analysis of Phase Spectrum of Speech Signals Using Allpass Modeling

Vijayan, K and Kodukula, Sri Rama Murty (2015) Analysis of Phase Spectrum of Speech Signals Using Allpass Modeling. IEEE/ACM Transactions on Audio, Speech and Language Processing, 23 (12). pp. 2371-2383. ISSN 2329-9290

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The phase spectrum of Fourier transform has received lesser prominence than its magnitude counterpart in speech processing. In this paper, we propose a method for parametric modeling of the phase spectrum, and discuss its applications in speech signal processing. The phase spectrum is modeled as the response of an allpass (AP) filter, whose coefficients are estimated from the knowledge of speech production process, especially the impulse-like nature of excitation source. A signal retaining only the phase spectral component of speech signal is derived by suppressing the magnitude spectral component, and is modeled as the output of an AP filter excited with a sequence of impulses. Entropy of energy of the input signal is minimized to estimate the coefficients of the AP filter. The resulting objective function, being nonconvex in nature, is minimized using particle swarm optimization. The group delay response of estimated AP filters can be used for accurate analysis of resonances of the vocal-tract system (VTS). The error signal associated with AP modeling provides unambiguous evidence about the instants of significant excitation of the VTS. The applications of the proposed AP modeling include, but not limited to, formant tracking, extraction of glottal closure instants, speaker verification and speech synthesis.

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IITH Creators:
IITH CreatorsORCiD
Kodukula, Sri Rama Murty
Item Type: Article
Uncontrolled Keywords: Entropy, Fourier transforms, IEEE transactions, Linear programming, Parametric statistics, Speech, Speech processing
Subjects: Others > Electronic imaging & Singal processing
Others > Engineering technology
Divisions: Department of Electrical Engineering
Depositing User: Team Library
Date Deposited: 28 Sep 2015 04:45
Last Modified: 05 Dec 2017 03:58
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