Percepção de fala: análise das vogais do português brasileiro em tempo comprimido

Abstract

Santos, J. (2006). Speech perception analysis of the vowels of the Brazilian Portuguese in time-compressed. . Dissertacao (mestrado) – Faculdade de Filosofia, Ciencias e Letras de Ribeirao Preto, Universidade de Sao Paulo, Ribeirao Preto, 101p. The temporal aspect of speech is one of the factors that affect the intelligibility of speech. Thus, the aim of the present study was to investigate the perception of Brazilian Portuguese (BP) vowels in different speech rates through acoustic analysis and psychophysical tests. In the acoustic analysis, we investigated the sentences duration containing target vowels and, subsequently, only the vowels. In Experiment I, there was a significant difference between the duration of sentences in both speech rates (normal and fast), and in the duration of the vowels there was a significant difference between the speech rates and between the vowels. In Experiments II, the results showed differences between the sentences concerning the speed rate, normal and ‘faster”, but not between the target vowels in the sentences. However, in the “faster” speech rate showed difference between the vowels. The analyses of the 3 sets of vowels in both experiments revealed a significant difference in speed rates as well as in the 7 vowels of the BP. The psychophysical judgment of compressed speech was done using 28 randomized sentences with 7 BP vowels, 2 speed rates (normal and fast) and 2 repetitions (test and retest) to evaluate the test reliability. The sample was composed by 32 subjects distributed in 2 experiments. In Experiment 1 (n=16) the subjects did not have difficulty in the speech intelligibility In Experiment II (n=16) the speed rate of “faster” sentences was increased in 30% in relation to the normal rate. The results showed that the subjects noticed that there was a decrease in the speech intelligibility due to the speed; however, they did not