Articulatory and acoustic bases of locus equations  

Björn Lindblom & Harvey M Sussman^

^ Department of Linguistics and Department of Communication Sciences & Disorders, University of Texas, Austin, Texas

In the Proceedings of Fonetik 2004, the XVII Swedish Phonetics Conference, Stockholm, May 26-28, 2004: 8-11.

ABSTRACT

Articulatory factors underlying locus equations (LE's) are investigated by means of an updated version of the APEX articulatory model. The modeling is focused on the determinants of LE linearity, slopes and intercepts. The results indicate that, for [b] and [d], the linearity of the LE's derives in part from acoustic mapping constraints, and in part from the extent to which a given CV sequence is coarticulated. Slopes and intercepts can be varied by manipulating the degree of coarticulation (DOC). For [g] a different pattern is seen. The modeling suggests a non-linear (read: bi-linear) relation between F2 on-sets and F2 vowel values. Moreover, slopes and intercepts are not affected as much by changes in DOC which manifests itself primarily as a resampling of the bi-linear F2 onset-F2 vowel relationship. These findings are discussed in the context of the to the current debate on the articulatory origins and perceptual functions of LE's.

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