Measurement of temporal changes in vocal tract area function from 3D cine-MRI data.
J Acoust Soc Am
; 119(2): 1037-49, 2006 Feb.
Article
en En
| MEDLINE
| ID: mdl-16521766
A 3D cine-MRI technique was developed based on a synchronized sampling method [Masaki et al., J. Acoust. Soc. Jpn. E 20, 375-379 (1999)] to measure the temporal changes in the vocal tract area function during a short utterance /aiueo/ in Japanese. A time series of head-neck volumes was obtained after 640 repetitions of the utterance produced by a male speaker, from which area functions were extracted frame-by-frame. A region-based analysis showed that the volumes of the front and back cavities tend to change reciprocally and that the areas near the larynx and posterior edge of the hard palate were almost constant throughout the utterance. The lower four formants were calculated from all the area functions and compared with those of natural speech sounds. The mean absolute percent error between calculated and measured formants among all the frames was 4.5%. The comparison of vocal tract shapes for the five vowels with those from the static MRI method suggested a problem of MRI observation of the vocal tract: data from static MRI tend to result in a deviation from natural vocal tract geometry because of the gravity effect.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Faringe
/
Fonación
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Imagen por Resonancia Cinemagnética
/
Laringe
Límite:
Humans
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Male
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Middle aged
Idioma:
En
Revista:
J Acoust Soc Am
Año:
2006
Tipo del documento:
Article
Pais de publicación:
Estados Unidos