A multisectional representation of the tongue surface based on ultrasound scans for time-varying vocalizations
Mare A. Cordaro, Maureen L. Stone, Moïse H. Goldstein, Michael A. Unser · The Journal of the Acoustical Society of America · 1991
This paper describes a technique for producing a movie of multiple planes of the tongue surface based on midsagittal and coronal ultrasound scans of the tongue during time-varying vocalizations. For each scan view, the ultrasound images and acoustic signal of a given vocalization are recorded on videotape. The resulting sequence of video fields is digitized and processed to yield a sequence of two-dimensional coronal tongue profiles. Formant and fundamental frequencies are determined from the acoustic signal segment corresponding to each video field. Data for a number of coronal scan views are recorded with the vocalization repeated for each view. The resulting tongue profile sequences are time warped in a piecewise linear fashion (utilizing characteristics of both the ultrasound and acoustic data) to produce a single sequence of multiple time-aligned tongue surface profiles that are displayed in slow motion or freeze-frame modes.