  So far, several physical models have been proposed for the study of vocal
fold oscillations during phonation. The parameters of these models, such as
vocal fold elasticity, resistance, etc. are traditionally determined through
the observation and measurement of the vocal fold vibrations in the larynx.
Since such direct measurements tend to be the most accurate, the traditional
practice has been to set the parameter values of these models based on
measurements that are averaged across an ensemble of human subjects. However,
the direct measurement process is hard to revise outside of clinical settings.
In many cases, especially in pathological ones, the properties of the vocal
folds often deviate from their generic values---sometimes asymmetrically
wherein the characteristics of the two vocal folds differ for the same
individual. In such cases, it is desirable to find a more scalable way to
adjust the model parameters on a case by case basis. In this paper, we present
a novel and alternate way to determine vocal fold model parameters from the
speech signal. We focus on an asymmetric model and show that for such models,
differences in estimated parameters can be successfully used to discriminate
between voices that are characteristic of different underlying vocal fold
pathologies.
