Maintaining a small glottal opening across a large range of voice conditions is critical to normal voice production. This study investigated the effectiveness of vocal fold approximation and stiffening in regulating glottal opening and airflow during phonation, using a three-dimensional numerical model of phonation. The results showed that with increasing subglottal pressure the vocal folds wer...

F0 lowering, creaky voice, Danish stød and glottal stops may at first seem like a group of only vaguely related phenomena. However, a theory proposed by Jan Gauffin (JG) almost forty years ago puts them on a continuum of supralaryngeal constriction. The purpose of the present remarks is to briefly review JG:s work and to summarize evidence from current research that tends to reinforce many of h...

The automatic analysis of temporal patterns of vocal folds motion and the tracking of glottal cues such as folds edge position or glottal area, has recently become a topic of interest in the field of laryngeal video imaging. We discuss here the use of a numerically simulated model of the folds motion within a video analysis context, for the analysis of videokymographic data and glottal cues seg...

The objective of this work is to characterize the intervocalic glottal stops in Assam Sora. Assam Sora is a low resource language of the South Munda language family. Glottal stops are produced with gestures in the deep laryngeal level; hence, the estimated excitation source signal is used in this study to characterize the source dynamics during the production of Assam Sora glottal stops. From t...

This study presents a method for estimation of glottal formant frequency (Fg) from speech signals. Our method is based on zeros of z-transform decomposition of speech spectra into two spectra : glottal flow dominated spectrum and vocal tract dominated spectrum. Peak picking is performed on the amplitude spectrum of the glottal flow dominated part. The algorithm is tested on synthetic speech. It...

Recent studies have shown that text-to-speech synthesis quality can be improved by using glottal vocoding. This refers to vocoders that parameterize speech into two parts, the glottal excitation and vocal tract, that occur in the human speech production apparatus. Current glottal vocoders generate the glottal excitation waveform by using deep neural networks (DNNs). However, the squared error-b...

This contribution summarizes our recent investigations in the use of the glottal source for characterizing expressive voice. It is organized in three main parts. First, we study which methods are the most suited for estimating the glottal flow directly from the speech signal. This is a particularly difficult task which is a typical case of blind separation, since neither the vocal tract nor the...

Glottal stops are sounds produced by the closing and abrupt opening of the vocal folds. In German, glottal stops are frequent before word-initial vowels and are a salient word-linking technique. For this reason, German speakers can transfer this word-linking habit to their English productions. Neither in English nor in German are glottal stops phonemes, i.e. they cannot differentiate word meani...

In this paper a new inverse filtering technique for the timedomain estimation of the glottal excitation is presented. This approach uses the DAP modeling for the vocal tract characterization, and a spectral model for the derivative of the glottal flow. This spectral model is based on the spectrum of the KLGLOTT88 model for the glottal source. The proposed procedure removes the glottal source fr...