Clarence J. LeBel

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Acknowledgements I would like first and foremost to dedicate this thesis to my father, Dr. Anthony N. Okobi, who passed away on October 11, 2005, and my maternal grandmother, Josephine M. Emodi, who passed away on August 7, 2005. Both these beautiful people were the most influential figures in my life. As a child, my grandmother fueled my curiosity and(More)
In recent years, research in human speech communication suggested that the inventory of sound units that are observed in vowels across languages is strongly influenced by the acoustic properties of the human subglottal system. That is, there is a discrete set of possible vowel features that are constrained by the interaction of the acoustic/articulatory(More)
This thesis demonstrates that acoustic variability, acoustic measurement error, and phoneme classiication error can be interpreted as predictable entailments of articulatory variability. Speech production theory is tapped to explain sources of variability in the acoustic signal, including random variation in a turbulent spectrum, increased losses at the(More)
The lateral consonant in English is generally produced with a backed tongue body, a midline closure of the tongue blade at the alveolar ridge, and a path around one or both of the lateral edges of the tongue blade. In pre-vocalic lateral consonants, the release of the closure causes a discontinuity in the spectral characteristics of the sound. Past attempts(More)
Advanced laryngeal cancer is often treated by surgical removal of the larynx (laryngectomy) thus rendering patients unable to produce normal voice and speech. Laryngectomy patients must rely on an alternative means of producing voice and speech, with the most common method being the use of an electrolarynx (EL). The EL is a small, hand-held,(More)