Ajustes supralaríngeos de qualidade vocal: correspondências entre a aplicação do VPAS e medidas vocálicas de F1 e F2

Abstract

This dissertation focuses on supralaryngeal voice quality settings and is based on the phonetic model of voice quality and on the source-filter model for vowels. It aims at analyzing the acoustic countnerparts of supralaryngeal voice qualities, especially in terms of the impact on the phoneticacoustic identity of oral vowels in Brazilian Portuguese. The project was approved by the Ethics Research Committee (CAAE 50255221.0.0000.5482). The methodology explores the perceptual (Vocal Profile Analysis Scheme-VPAS) and acoustic (formant measures - F1 and F2) correspondences of supralaryngeal voice qualities, comparing samples of speakers with neutral and non-neutral supralaryngeal settings. Audio recordings of 22 speakers were selected from a database, along with the perceptual judgments of voice qualities. The samples were segmented and submitted to acoustic analysis (program PRAAT version 6.2.09) to extract F1 and F2 values (converted to Mel scale). Qualitative (auditory space of vowels) and quantitative (multivariate statistical analysis - discriminant analysis and principal components analysis aporocahes were carried out. The results indicate the impact of supralaryngeal voice quality settings on the phonetic identity of vowels, especially in vowels (/a, ɛ, e, i, ɔ, o, u/). Although high correlation values of voice quality settings and F1 and F2 values were not detected, the discriminant power of acoustic measures (F1 and F2) to detect oral vowels was decreased in voice samples with predominantly non-neutral settings