Abstract
This study reports on the ability of an area function model of the vocal tract [Story and Titze, J. Phonetics 26, 223–260 (1998)] to compensate for a labial perturbation. The area function model, which consists of a neutral shape and two weighted orthogonal shaping patterns (modes), is first configured for a typical production of /u/. An effective lip tube based on the labial perturbation experiment reported by Savariaux et al. [J. Acoust. Soc. Am. 98, 2428–2442 (1995)] is then imposed on the area function model (by forcing the lip section to be a constant cross-sectional area). Frequency responses are computed for both the normal and the perturbed shapes. Next, an attempt was made to vary the weighting values for the two shaping patterns of the area function model so that the first two formants were moved back toward their unperturbed frequency locations. The result was that weighting values can be determined that do move the formants in the appropriate direction for compensation. Additionally, the resulting area function shows characteristics similar to those presented by Savariaux et al.; that is, a movement of the constriction location posteriorly and a widening of the anterior portion of the front cavity. [Work supported by NIH R01-DC04789-01.]
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