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Techniques d'analyse et de synthèse de la parole appliquées à l'apprentissage des langues

Abstract : Nowadays when exchanges between people are more and more international, foreign language grasp is becoming essential. The computer-assisted language learning seems to be a new stake. In particular, the improvement of oral comprehension constitutes one of keys to control a language. To improve intelligibility, I work out a first strategy based on selective slowing down of speech signal. The transitory parts - regions of high acoustic cue concentration - turns out to be privileged candidates to the slowing down. The detection of these regions is based on the computation of a coefficient which reflects spectrum variation rate. I work out a second strategy which enhances relevant events of speech, i.e. that its amplification improves intelligibility. This strategy is based on the preservation of phonetic contrasts, in particular between voiced and unvoiced consonants. Thus, I developed an algorithm of detection of unvoiced plosives and unvoiced fricatives from criteria on energy. Two experiments of perception have been carried out to validate these strategies of intelligibility improvement: the first, preliminary, with French listeners on American sentences and the second with foreign students (learning French as foreign language) on French sentences. At last, to modify the prosodic elements (rhythm, intensity, fundamental frequency), my work was based on PSOLA method (Pitch Synchronous OverLap and Add). I work out an algorithm of pitch marking and I improve the accuracy of synthesis method. These strategies are totally automatic and allow to improve intelligibility of speech signal in the framework of language learning.
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Submitted on : Thursday, March 29, 2018 - 10:43:12 AM
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Vincent Colotte. Techniques d'analyse et de synthèse de la parole appliquées à l'apprentissage des langues. Autre [cs.OH]. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10222⟩. ⟨tel-01746716⟩



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