Implicações do estilo de fala da manchete noticiosa radiofonica sobre parametros acusticos vocalicos e prosodicos no portugues brasileiro

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

This is an acoustic phonetic study of news broadcast reading of a controlled headline corpus by three professional speakers in a laboratory setting. F1, F2, F3 and F4 of the seven stressed vowels /a,e,_,i,o,_,u/ and of the two pre-stressed vowels /e/ e /o/ of Brazilian Portuguese (BP) were measured and statistically analyzed. The independent variables were style, vowel and speaker. A separate set focusing exclusively on the pre-stressed vowels /e/ and /o/ was also set up and analyzed according to the same design except for the inclusion of a new variable: sentence position, of which the levels were ?initial? and ?final?. Considering tat the same texts were used for eliciting both styles and that their distinction was obtained through instructions which yielded consistent prosodic differences, a part of this study was devoted to the description of the parameters involved, namely: mean F0, mean syllable duration and mean total length. The analysis unit was the utterance.The speakers were also asked to read the same corpus in a style as neutral as possible. The results for formants analyzed separately show that F1 and F2 vary primarily as function of vowel quality, but also exhibit small percentages of speaker dependent variation, and, in the case of F1, a slightly greater percentage of variation due to speaking style. In addition, F1 presents significant interaction between vowel and style. As for F2, significant interactions hold for vowel and speaker, and vowel and style. The third formant (F3) has its variability distributed more uniformly among the effects of speaker, vowel, style; the interaction between vowel and speaker is also significant. The fourth formant (F4) has its variability explained mainly by the speaker, followed closely by vowel variability. Duration is relatively influenced by vowel quality; in addition, it displays effects related to style, and, to a lesser extent, to speaker. As style is the main independent variable of this work, it is worth pointing out that, among the three parameters affected by style, duration was the one that proportionally shows the greatest effect size. In the prosodic domain, style is responsible for the most part of F0 variability, and its effects are greater than those of speaker variability. These results are discussed in relation to previous acoustic analyses of the BP vowel space. The roles of duration and of vowel opening in characterizing the headline style in news broadcast reading are interpreted from the point of view of a speech dynamics conception where linguistic and stylistic information have concurrent effects on vocal tract variables

ASSUNTO(S)

vowels portuguese language portuguese language portuguese language lingua portuguesa - versificação versification acustica lingua portuguesa - estilo lingua portuguesa - fonetica acoustics phonetics portuguese language style lingua portuguesa - vogais

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