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Subspace Based Vowel-Consonant Segmentation

Muralishankar, R and Krishna, Vijaya A and Ramakrishnan, AG (2003) Subspace Based Vowel-Consonant Segmentation. In: 2003 IEEE Workshop on Statistical Signal Processing, September 28 – October 1, 2003, St.Louis, USA, pp. 589-592.

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Abstract

In our (knowledge-based) synthesis system [I], we use single instances of basic-units, which are polyphones such as CV, VC, VCV. VCCV and VCCCV, where C stands for consonant and V for vowel. These basic-units are recorded in an isolated manner from a speaker and not from continuous speech or carrier-words. Modification of the pitch, amplitude and duration of basic-units is required in our speech synthesis system I I] to ensure that the overall characteristics of the concatenated units matches with the true characteristic of the target word or sentence. Duration modification is carried out on the vowel parts of the basic-unit leaving the consonant portion in the basic-unit intact. Thus, we need to segment these polyphones into consonant and vowel parts. When the consonant present in any basic-unit is a plosive or fricative, the energy based method is good enough to segment the vowel and consonant parts. However, this method fails when there is a co-articulation between the vowel and the consonant. We propose the use of orientedprincipal comporierir analysis (OPCA) to segment the co-articulated units. The test feature vectors (LPC-Cepsrmm & Mel-Cepsrmm) are projected on the consonant and vowel subspaces. Each of these subspaces are represented by generalized eigenvectors obtained by applying OPCA on the training feature vectors. Our approach successfully segments co-articulated basic-units.

Item Type: Conference Paper
Additional Information: ©2003 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Electrical Sciences > Electrical Engineering
Date Deposited: 11 Jun 2004
Last Modified: 19 Sep 2010 04:12
URI: http://eprints.iisc.ernet.in/id/eprint/320

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