Modeling Vocal Tract Influence
Piecewise Cylindrical Approximations
A distributed acoustic model of the vocal tract can be developed by approximating the dimensions of the upstream windway with a series of concatenated cylindrical pipe sections.
In the digital waveguide context, each cylindrical section is efficiently implemented with a single digital delay-line and a one-multiply scattering junction.
This approach was previously used to create an articulatory vocal tract model for the synthesis of singing
With a model capable of accurately simulating arbitrary vocal tract profiles, it is possible to explore general windway shape trends and influences as reported by Clinch et. al.
Clinch et al. (1982)
A multi-segment cylindrical model of the vocal tract was implemented for this study, though its use presented several challenges.
In general, it is difficult to predict the way changes in vocal tract shape will affect the resonance structure of the upstream system.
Further, the resulting parameter space is complex and requires a well developed, intuitive control interface.
Finally, such complexity is unnecessary when one considers that the performer typically makes use of just a single windway resonance to influence the vibrations of the reed.
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Gary P. Scavone