Abstract
A model of the vocal tract area function has been developed that consists of three tiers. The first tier is a vowel substrate defined by a system of spatial eigenmodes determined from MRI and/or x-ray microbeam data and a neutral area function. The input parameters to this first tier are coefficient values that, when multiplied by the appropriate eigenmode and added to the neutral area function, construct a desired vowel. The second tier consists of a Gaussian shaping function defined along the length of the vocal tract that modifies the vowel substrate such that a constriction is formed. Input parameters consist of the location, area, and range of the constriction. Location and area roughly correspond to the standard phonetic notions of place and degree of constriction while range defines the amount of vocal tract length over which the constriction will influence the tract shape. The third tier allows length modifications for articulatory maneuvers such as lip rounding/spreading and larynx lowering/raising. All parameters can be specified either as static or time-varying, which allows for multiple levels of coarticulation to be produced. The model will be discussed and then used to simulate several VCV syllables. [Work supported by NIH R01-DC04789.]
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