Fifth International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 2007)

Florence, Italy
December 13-15, 2007

Towards the Simulation of Pathological Voice Qualities

S. Ben Elhadj Fraj (1), Francis Grenez (1), Jean Schoentgen (1,2)

(1) Laboratory of Images, Signals & Telecommunication Devices, Université Libre de Bruxelles, Brussels, Belgium
(2) National Fund for Scientific Research, Belgium

The presentation concerns a synthesizer for disordered voices. The simulation of dysphonia is a topic the relevance of which is growing, but to which few studies have been devoted. The simulator that is discussed here involves a nonlinear memory-less model of the glottal area that is driven by a harmonic excitation the instantaneous frequency and amplitude of which are controlled. The glottal airflow rate is generated by means of an aerodynamic model of the glottis, which also comprises trachea-source and source-tract interactions as well as the generation of turbulence noise at the glottis. Trachea and vocal tract are modelled by means of a concatenation of lossy cylindrical pipes of identical length, but different cross-sections. The text concerns the presentation of the synthesizer and its synthetic output, as well as the results of a perceptual evaluation of the naturalness of simulated speech sounds in the framework of a stimuli comparison paradigm.

Full Paper (reprinted with permission from Firenze University Press)

Bibliographic reference.  Fraj, S. Ben Elhadj / Grenez, Francis / Schoentgen, Jean (2007): "Towards the simulation of pathological voice qualities", In MAVEBA-2007, 3-6.