In this paper we describe an approach for extracting asymmetry proportions of vocal folds which affect vibrations. Combining high speed observations with the two-mass model by Ishizaka & Flanagan (1972) as modified by Steinecke & Herzel (1995) an inversion algorithm, is presented which allows the identification of physiological parameters of the vocal folds. The problem can be regarded as an optimization problem with a non-convex objective function. Therefore, the choice of appropriate initial values is important. It can be automized by using spectral features of the mass trajectories. The applicability of the inversion, procedure to high speed observations of vocal fold vibrations is demonstrated in a case of functional dysphonia and in a healthy voice.

Index Terms. high speed glottography, two mass model, inversion