Third International Conference on Spoken Language Processing (ICSLP 94)

Yokohama, Japan
September 18-22, 1994

Aerodynamical, Geometrical and Mechanical Aspects of Bilabial Plosives Production

X. Pelorson, T. Lallouache, S. Tourret, C. Bouffartigue, Pierre Badin

Institut de la Communication Parlée, URA CNRS N°368, INPG, University Stendhal, Grenoble, France

In a attempt to characterise the production of stop consonants, this paper presents a comprehensive study of voiceless bilabial plosive sounds production. The double issue of this research will be to develop realistic models to be integrated in articulatory models, and to provide means of studying control strategies for the command of these models. Geometrical and acoustical characterisation of bilabial plosives is achieved by means of a non-invasive method using video monitoring. The experimental system used makes possible to automatically extract parameters such as lip height, lip width, and intralabial lip area for front pictures, and of upper and lower lip protrusions for profile pictures. In order to catch more details of the upper and lower lip movements, the system has been extended to use a high speed camera providing 400 fields per second. This experimental technique also allows simultaneous aerodynamical measurements as well as some simple but illustrative unsteady-flow visualizations (using a smoke method). We then present a simple model for plosive sounds production. In this model, the mechanics of the upper and lower lips is represented by a mass-springs model while the time-varying geometry of the lips is described using a simple but realistic three-dimensional shape. Lastly the behaviour of the flow through the lips is described using a quasi stationary model which includes-the.effects of flow separation point. Some first simulation results will be shown, and compared with the experimental measurements and visualisations.

Full Paper

Bibliographic reference.  Pelorson, X. / Lallouache, T. / Tourret, S. / Bouffartigue, C. / Badin, Pierre (1994): "Aerodynamical, geometrical and mechanical aspects of bilabial plosives production", In ICSLP-1994, 599-602.