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Type: Artigo de periódico
Title: Spectral Fndings For Vowels [a] And [ã] At Different Velopharyngeal Openings. [achados Espectrais Das Vogais [a] E [ã] Em Diferentes Aberturas Velofaríngeas]
Author: Lima-Gregio A.M.
De Cassia Rillo Dutka-Souza J.
De Castro Marino V.C.
Pegoraro-Krook M.I.
Barbosa P.A.
Abstract: Background: the size control of velopharyngeal opening is an important variable for the acoustic profle characterization of hypernasal speech. Aim: to investigate frequency spectral aspects of F1, F2, F3, nasal formant (FN) and anti-formant, in Hertz, for vowels [a] and [ã] at different velopharyngeal openings produced in the bulb of a palatal prosthesis replica used by a patient with velopharyngeal insuffciency. Method: speech recordings were obtained for four words ("pato/mato" and "panto/manto") produced within a carrier phrase in 5 conditions of velopharyngeal functioning: prosthesis with no openings (control condition: CC); prosthesis with bulb opening of 10mm2 (experimental condition with 10mm2 opening: EC10), prosthesis with a 20mm2 opening (EC20), prosthesis with a 30mm2 openning (EC30), and without the prosthesis (ECO). Five speech-language pathologists made a live rating of speech nasality during the reading of an oral passage. The recordings were used for spectral analysis. Results: F1 values were signifcantly higher for [a] when compared to [ã] in all conditions. F2 values for [a] in EC20 and EC30 were signifcantly lower than values in the other conditions, being closer to the values presented for [ã]. F3 values were not signifcantly different between the testing conditions. There was a relationship between FN and anti-formants, and the auditory perception of nasality for conditions EC10 and EC20. Conclusion: signifcant changes were observed in the studied spectral values according to changes in the velopharyngeal opening size.
Rights: aberto
Identifier DOI: 10.1590/S0104-56872010000400026
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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