Voice Quality: Functions, Analysis and Synthesis

August 27-29, 2003
Geneva, Switzerland

Variation of Glottal LF Parameters Across F0, Vowels, and Phonetic Environment

Michelle Tooher, John G. McKenna

School of Computer Applications, Dublin City University, Dublin, Ireland

The following paper presents the results of a study of glottal source parameters and their behaviour across vowels, contexts and fundamental frequency. The utterances collected consisted of multiple recordings of three vowels in 4 different contexts, across seven different pitches from two male speakers. The vowels were extracted, automatically inverse filtered using a Kalman filter based linear prediction technique, and the Liljencrants-Fant model was automatically fitted to the resulting glottal flow derivative yielding the glottal flow parameters. Results obtained generally followed our expectations, and previous research in the area. The timing parameters do vary with fundamental frequency, however they do not vary uniformly. Parameters are also influenced slightly by both phonetic environment and the vowel utterance and patterns are apparent across both speakers.

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Bibliographic reference.  Tooher, Michelle / McKenna, John G. (2003): "Variation of glottal LF parameters across F0, vowels, and phonetic environment", In VOQUAL'03, 41-46.