ETRW on Speech Processing in Adverse Conditions Cannes-Mandelieu, France November 10-13, 1992

Characterization of Vocal Tract Impulse Responses for Articulatory Configurations of Vowels in Hyperbaric Conditions

M. Guitton, J. Crestel

ENSSAT/LASTI, Lannion, France

This paper deals with the length of the impulse response of vowels in hyperbaric conditions. The impulse responses of 5 vowels [a, @, i, O, y] are computed from a n-tube model for the different parameters of synthetic breathing mixtures at different depths. In these conditions it is shown that the length of the impulse responses are shorter than those in standard conditions but still remain dependant of articulatory configuration. These shorter impulse responses imply specific properties for hypeibaric speech and especially:

• The properties of quasi-periodicity are more robust
• The systematic errors in the deconvolution of the excitation and of the impulse response are very smalll, providing the maximal improvement of intelligibility for methods based on an A-R-model.

Full Paper

Bibliographic reference.  Guitton, M. / Crestel, J. (1992): "Characterization of vocal tract impulse responses for articulatory configurations of vowels in hyperbaric conditions", In SPAC-1992, 247-250.