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Estimation of the vocal tract shape has applications in articulatory synthesis, speech recognition, and speech-training aids. LPC based analysis can be used to obtain the vocal tract shape during speech segments produced with glottal excitation and with fixed as well as transitional tract configurations. During the stop closures of Vowel-Consonant-Vowel (VCV) utterances, the shape can be estimated by bivariate surface modeling of the shapes during transition segments. The shape obtained by LPC analysis of steady vowels shows variability with the position of the analysis frame.
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