Re: A question on area function of vocal tract

["Richard F. Lyon" <DickLyon@xxxxxxx>]

Jont, good to hear you're still participating in this field; I'm 
getting back into it myself.

Xinhui, the other thing to keep in mind is that the acoustic theory 
of speech production is just an approximation to what goes on in the 
vocal tract, which actually appears to involve seriously nonlinear 
jet and vortex behavior where air comes through the vocal folds. 
These effects may likely be a bigger perturbation to the model than 
any bending is.  The plain-wave model gets you the right approximate 
resonant frequencies, but don't expect a lot more.

Dick