Glottal Flow Model-based Vocoder
Channel: GIPSA-lab
Date: 04/09/2019

GFM-Voc (Glottal Flow Model based Vocoder) is the first system that allows high-quality and real-time voice modification, including: articulation manipulation (simulate a change of jaw, tongue and lip positions) ; voice quality manipulation (change the perceived voice force or tenseness).
The system is based on the implementation of a newly developed source-filter decomposition method, called GFM-IAIF, that allows the extraction of both vocal tract and glottis contributions to the speech signal, as compact set of filter parameters. The latter are then controllable through a GUI, before re-synthesis of the speech with the modified parameters. The system requires no training, and operates on any voice, male or female, without tuning. Examples of applications for this system include expressive speech synthesis, by adding the system at the end of a speech synthesiser pipeline ; auditory feedback perturbation to study a speaker's response to modified speech ; and speech therapy.