A Study of Temporal Structure of Glottal Flow Derivative Estimates Associated with Laryngeal Pathology

Emir Turajlic and Dzenan Softic

Keywords

Biomedical Signal Processing, Noninvasive Measurement, Liljencrants-Fant’s model, Laryngeal Pathology, ECG Modelling

Abstract

This paper presents a comparative study of the temporal structure of the glottal flow derivative signal associated with laryngeal pathology in relation to an idealized view of voice source realizations as defined by Liljencrants-Fant’s model. Specifically, we endeavor to ascertain the extent by which Liljencrants-Fant’s model can be used to represent the glottal flow derivative estimates obtained via closed-phase pitch synchronous inverse filtering of recorded speech. The results obtained on six common voice pathology examples show that due to the limited degrees of freedom, Liljencrants-Fant’s model is only capable of adequately representing the “coarse” glottal pulse structure. Our findings demonstrate that the “fine” structural elements constitute an important aspect of a glottal flow derivative realization and we have presented evidence that they contain information related to voice individuality. A further inadequacy of Liljencrants-Fant’s model is that its parameters do not always accurately portray significant events in the vocal fold dynamics.

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