Research in speech synthesis focuses on the French and the Spanish languages. Voice analysis research is carried out on speech and on singing voice, with potential application to voice pathology acoustics. Analysis, synthesis and perception are intimately tied.
Voice quality depends mainly on the voice source.
A theoretical investigation of glottal flow models was conducted and the correspondance between time-domain models and analytic spectra has been worked out for the main glottal flow models. With the help of this correspondance, new algorithms for the open quotient estimation were developed. We compared spectral estimation of the open quotient with electroglottographic signals. Voice source analysis using acoustic and physiological signals is also being studied. Vocal effort is an important source of variability in speech.