The degree of glottal closure during phonation has an influence on voice quality and it is related to the robustness of the voice source. To quantify glottal closure a frame of reference was created by investigating 47 healthy men and 92 healthy women with no vocal complaints using videolaryngostroboscopy. Observing recorded images the degree of glottal closure was rated with a percentage. Resu...

In this paper we explore the importance of speaker specific information carried in the glottal source. We time align utterances of two speakers speaking the same sentence from the TIMIT database of American English. We then extract the glottal flow derivative from each speaker and interchange them. Through time alignment and this glottal flow transformation, we can make a speaker of a northern ...

Glottal flow waveforms estimated by inverse filtering acoustic speech pressure signals were compared to glottal area functions obtained by digital high-speed imaging of the vocal fold vibration. Speech data consisted of breathy, normal and pressed phonations produced by two male and one female subjects. The results yield both qualitative and quantitative information about the relationship betwe...

From a recorded speech signal, we propose to estimate a shape parameter of a glottal model without estimating his time position. Indeed, the literature usually propose to estimate the time position first (ex. by detecting Glottal Closure Instants). The vocal-tract filter estimate is expressed as a minimum-phase envelope estimation after removing the glottal model and a standard lips radiation m...

Glottal flow waveforms estimated by inverse filtering acoustic speech pressure signals were compared to glottal area functions obtained by digital high-speed imaging of the vocal fold vibration. Speech data consisted of breathy, normal and pressed phonations produced by two male and one female subjects. The results yield both qualitative and quantitative information about the relationship betwe...

The pattern of efferent neural activity recorded from the isolated brain stem preparation of the tadpole Rana catesbeiana was examined to characterize fictive gill and lung ventilations during ontogeny. In vitro recordings from cranial nerve (CN) roots V, VII, and X and spinal nerve (SN) root II of premetamorphic tadpoles showed a coordinated sequence of rhythmic bursts occurring in one of two ...

L'aire glottique au noyau vocalique est calculee pour 9 types de voisement differents (niveaux moyen, fort et faible; frequences fondamentales baute et hasse ; phonations normale, breathy et pressee) pour 10 locuteurs differents, en utilisant l'equation de l'orifice. Une variabilite considerable inter-locuteurs et entre les types de voix est trouvee, mais quelques tendances sont observees. Des ...

A first attempt at implementing a flexible model for the glottal source waveform of pathologic voices is described. The LF (Liljencrants & Fant) model is the source model used. We also add various noise types, shimmer and jitter to the excitation source in order to replicate more closely the pathologic glottal waveform. Various vocal characteristics are then modeled in order to evaluate the per...

The treatment of subglottic stenosis in children is one the most complex and difficult challenges field pediatric otolaryngology. Therefore, it requires a team approach that includes an anesthesiologist, pediatrician, intensivist. This article introduces latest concepts glottal (glottal softening, cysts, etc.) children, with particular attention to reports obtained over years abroad. In order a...