Speech synthesis using a nonlinear energy damping model for the vocal folds vibration effect

From a theoretical viewpoint, the vocal folds vibration affects the vocal tract transfer characteristics through nonlinear time-varying interaction between the glottis and vocal tract. Therefore, it is crucial to investigate and model such e ects in order to improve voice quality in parametric rule-based speech synthesis systems. In this paper, we rst conducted analytic experiments on the vocal folds vibration e ects on the appeared in formant energy damping patterns and then modeled them by a nonlinear 2nd order di erential equation for speech synthesis. At last, we con rmed the feasibility of the nonlinear model by speech wave reconstruction experiments.