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Isovowel Lines for the Evaluation of Vowel Formant Structure in Speech Disorders

Speech Motor Control Laboratories, Waisman Center University of Wisconsin, Madison

Abstract

This report describes a system of isovowel lines in the F₁-F₂ and F₂-F₃ planes and demonstrates how these linear approximations to vowel formant frequencies for a diverse sample of speakers can be used to evaluate the vowel formant structures of individuals with speech disorders. The application to disordered speech is illustrated with data for dysarthric adults, deaf adolescents, and young children with developmental errors of // production.