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Ground truth vocal tract length data?

Dear list,

I am trying to implement an algorithm to estimate the vocal tract length
from formants by Dr. Hisashi Wakita (1977), "Normalization of Vowels
by Vocal-Tract Length and Its Application to Vowel Identification".
Is there any ground truth data of vocal tract length available like those
of Laryngograph-derived F0 databases?  If not, any suggestions to
how to valiadate the results?  Thanks.

Yang Shao

Graduate Research Associate
Perception and Neurodynamics Laboratory
Department of Computer and Information Science
The Ohio State University
2015 Neil Ave., Columbus, Ohio, USA