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Samia FRAJ


coordonnées


Samia FRAJ
tel +32-2-650.44.53, fax +32-2-650.47.13, sbenelha@ulb.ac.be
Campus du Solbosch
CP*, avenue F.D. Roosevelt 50, 1050 Bruxelles



unités de recherche


Traitement des Signaux (LIST/TS) [Signal Processing Group] (LIST/TS)



projets


Synthesis of disordered voices - Synthèse des troubles de la voix [Synthesis of disordered voices]
The objective is the development of a synthesiser that simulates disordered voices. The synthesiser comprises a nonlinear model of the evolving glottal area, an aerodynamic model of the glottis and models of the wave propagation in the vocal tract and trachea. The simulated disorders are vocal jitter and shimmer, vocal frequency and amplitude tremor, diplophonia, biphonation, random cycles, additive noise owing to turbulence as well as asthenia and strain. Medical applications of the synthesis of voice disorders are the discovery of the acoustic cues of disordered voice timbres, the training of speech therapy students in the rating of disordered voices and the testing as well as calibration of acoustic analysis methods for the functional assessment of voice. L'objectif du travail est le développement d'un synthétiseur vocal en vue de la simulation des troubles de la voix. Le synthétiseur comporte un modèle numérique de la source vocale et du conduit vocal. Les perturbations simulées sont les microperturbations de cycle-à-cycle des durées et amplitudes des cycles vocaux de parole, ainsi que le tremblement vocal. D'autre types de troubles simulés sont la diplophonie, la bi-phonation et les irrégularités des cycles vocaux dues aux vibrations aléatoires des plis vocaux, ainsi que le souffle et l'asthénie ou le forçage. Les applications médicales de la synthèse vocale sont les expériences perceptuelles cliniques, la formation des cliniciens débutant, le calibrage des algorithmes d'analyses des dispériodicités vocales ainsi que la synthèse des points d'ancrage perceptifs pour les jurys d'écoute. [The objective is the development of a synthesiser that simulates disordered voices. The synthesiser comprises a nonlinear model of the evolving glottal area, an aerodynamic model of the glottis and models of the wave propagation in the vocal tract and trachea. The simulated disorders are vocal jitter and shimmer, vocal frequency and amplitude tremor, diplophonia, biphonation, random cycles, additive noise owing to turbulence as well as asthenia and strain. Medical applications of the synthesis of voice disorders are the discovery of the acoustic cues of disordered voice timbres, the training of speech therapy students in the rating of disordered voices and the testing as well as calibration of acoustic analysis methods for the functional assessment of voice. ]

Speech Signal Analysis for Voice Disorders Characterization - Analyse du signal de parole pour la caractérisation des troubles de la voix [Speech Signal Analysis for Voice Disorders Characterization]
The analysis of speech is often involved in the evaluation of voice and the discrimination between disphonic and normophonic speakers. Most of the time, acoustic features of voice disorders are obtained from sustained vowels. However, sustaining speech sounds is considered to be less informative than speaking continuously. The objective of the project therefore is to monitor the voice timbre and vocal perturbations in connected speech. Vocal disperiodicities obtained are summarised by means of vocal features that report speech properties that are clinically relevant with regard to the assessment of a speaker's voice. The description of voice disorders owing to peripheral causes are also considered. L'analyse acoustique du signal de parole est souvent utilisée dans l'évaluation et la discrimination des voix pathologiques. Les mesures acoustiques utilisées pour caractériser les troubles de la voix sont extraites de voyelles soutenues. Cependant, la représentation basée sur les voyelles soutenues n'est pas toujours valide. L'estimation de paramètres à partir de la parole connectée semble plus adéquate. L'objectif de ce projet est le développement de méthodes permettant le suivi d'un locuteur au cours de la lecture d'un texte de longue durée. L'utilisation de méthodes applicables à des signaux non stationnaires est aussi envisagée. Le bruit estimé par les différentes méthodes permet de déterminer les indices pertinents utilisés dans la caractérisation des troubles de la voix du locuteur. La caractérisation de certains troubles vocaux dus à un problème neurologique périphérique, comme les voix dysarthriques, est aussi examinée. [The analysis of speech is often involved in the evaluation of voice and the discrimination between disphonic and normophonic speakers. Most of the time, acoustic features of voice disorders are obtained from sustained vowels. However, sustaining speech sounds is considered to be less informative than speaking continuously. The objective of the project therefore is to monitor the voice timbre and vocal perturbations in connected speech. Vocal disperiodicities obtained are summarised by means of vocal features that report speech properties that are clinically relevant with regard to the assessment of a speaker's voice. The description of voice disorders owing to peripheral causes are also considered. ]



prix


Best student paper award at the COST Workshop, Madrid 2009



disciplines et mots clés déclarés


Electromagnétisme - analyse du signal Ingénierie biomédicale Sciences de l'ingénieur

analyse de la parole bruit vocal conduit vocal signaux non stationnaires simulations numérique synthèse de la parole troubles de la voix