Acoustic analysis of children's voices: phonatory deviation diagram contributions
Análise acústica de vozes infantis: contribuições do diagrama de desvio fonatório
Leonardo Wanderley Lopes; Ivonaldo Leidson Barbosa Lima; Elma Heitmann Mares Azevedo; Maria Fabiana Bonfim de Lima Silva; Priscila Oliveira Costa Silva
Abstract
Purpose: to analyze the discriminatory power of the phonatory deviation diagram in assessing the predominant voice and intensity of vocal disorders in children.
Methods: sustained vowel /ε/ recordings were obtained from 93 children. The intensity of vocal deviation and quality were analyzed using a visual analog scale. Diagram was used for acoustic analysis, combined with the evaluation of vocal signs distribution according to area, quadrant, form, and density. We carried out the proportions equality test and the chi-square test (x2) to compare the variables, and the Spearman correlation test to correlate the acoustic and auditory perception measures.
Results: a correlation between quadrant classification and vocal deviation intensity was observed for all parameters analyzed. Differences statistically significant were detected among children with roughness, breathiness, strain, and instability, with regard to area, quadrant, and form. When considering the distribution of voices in the quadrants, no difference statistically significant was observed between the children with and without vocal deviation and voice quality for any parameter analyzed.
Conclusion: phonatory deviation diagram was able to differentiate predominant vocal quality through quadrant distribution, although it did not discriminate between the healthy and altered voices of children.
Keywords
Resumo
Objetivo: analisar o poder discriminatório do diagrama de desvio fonatório na avaliação do tipo de voz predominante e da intensidade do desvio vocal em crianças.
Métodos: coletou-se a vogal /ε/ sustentada de 93 crianças. A intensidade do desvio e a qualidade vocal foram analisadas por meio da escala analógico-visual. Utilizou-se o diagrama para a análise acústica, com avaliação da distribuição dos sinais vocais de acordo com a área, quadrante, forma e densidade. Realizou-se o teste de igualdade de proporções e o teste Qui-quadrado (x2) para comparar as variáveis, e o teste de Correlação de Spearman para correlacionar as medidas acústicas e perceptivo-auditivas.
Resultados: houve correlação entre a classificação de quadrantes e a intensidade do desvio vocal para todos os parâmetros analisados. Houve diferença estatisticamente significante entre a proporção de crianças com rugosidade, soprosidade, tensão e instabilidade em relação à área, ao quadrante e à forma. Não houve diferença estatisticamente significante entre a proporção de crianças com e sem desvio da qualidade vocal em relação a todos os parâmetros analisados, ao considerar a distribuição das vozes nos quadrantes.
Conclusão: o diagrama de desvio fonatório foi capaz de diferenciar a qualidade vocal predominante por meio da distribuição nos quadrantes, embora não tenha discriminado as vozes infantis saudáveis e alteradas.
Palavras-chave
Referencias
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Submitted date:
09/09/2014
Accepted date:
22/12/2014
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