Vocal quality assessment: methodological approach for a perceptive data analysis
Avaliação de qualidade vocal: abordagem metodológica para análise de dados perceptivos
Maria Fabiana Bonfim de Lima Silva; Sandra Madureira; Luiz Carlos Rusilo; Zuleica Camargo
Abstract
Purpose: to present a methodological approach for interpreting perceptual judgments of vocal quality by a group of evaluators who used the script Vocal Profile Analysis Scheme. Methods: cross-sectional study based on 90 speech samples from 25 female teachers with voice disorders and/or laryngeal changes. Prior to the perceptual judgment, we performed three perceptual tasks to select samples which were then presented to five evaluators using the Experiment script MFC 3.2 (software PRAAT). Next, we applied a sequence of tests based on successive approaches to inter- and intra-evaluator behavior. Data were treated by statistical analysis (Cochran and Selenor tests). Results: with respect to the analysis of the evaluators' performance, it was possible to define those that presented the best results, in terms of reliability and proximity of analyses, compared to the most experienced evaluator, excluding one. The results of the cluster analysis also allowed designing a voice quality profile of the group of speakers studied. Conclusions: the proposal of a methodological approach allowed defining evaluators whose judgments were based on phonetic knowledge, and drawing a vocal quality profile of the group of samples analyzed.
Keywords
Resumo
Objetivo: apresentar uma abordagem metodológica para interpretação de julgamentos perceptivos de qualidade vocal por um grupo de juízes que utilizou o roteiro Vocal Profile Analysis Scheme. Métodos: estudo transversal realizado a partir de 90 amostras de fala de 25 professoras da rede pública com distúrbio de voz e/ou alteração laríngea. Previamente ao julgamento perceptivo, foram realizadas três tarefas de percepção para a escolha das amostras que foram apresentadas a cinco juízes por meio do script Experiment MFC 3.2 (software PRAAT). A seguir, foi aplicada uma sequência de testes com base em abordagens sucessivas do comportamento inter e intrajuízes. Os dados foram tratados por meio de análise estatística (testes de Cochran e Snedecor). Resultados: com relação à análise do desempenho dos juízes foi possível definir aqueles que apresentaram melhores resultados em termos de confiabilidade e de proximidade de análises ao juiz mais experiente, com exclusão de um. Os resultados da análise de cluster também permitiram compor o perfil de qualidade vocal do grupo de falantes estudado. Conclusões: a proposta de abordagem metodológica permitiu definir os juízes, cujos julgamentos pautaram-se por conhecimentos fonéticos, bem como traçar o perfil de qualidade vocal do grupo de amostras analisadas.
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Referências
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Submetido em:
30/01/2017
Aceito em:
14/09/2017
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