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Theses

Synthèse paramétrique de la parole Arabe

Amal Houidhek 1, 2
1 MULTISPEECH - Speech Modeling for Facilitating Oral-Based Communication
Inria Nancy - Grand Est, LORIA - NLPKD - Department of Natural Language Processing & Knowledge Discovery
Abstract : The presented thesis deals with the adaptation of the conversion of a written text into speech using a parametric approach to the Arabic language. Different methods have been developed in order to set up synthesis systems. These methods are based on a description of the speech signal by a set of parameters. Besides, each sound is represented by a set of contextual features containing all the information affecting the pronunciation of this sound. Part of these features depend on the language and its peculiarities, so in order to adapt the parametric synthesis approach to Arabic, a study of its phonological peculiarities wasneeded. Two phenomena were identified : the gemination and the vowels quantity (short/ long). Two features associated to these phenomena have been added to the contextual features set. In the same way, different approaches have been proposed to model The geminated consonants and the long vowels of the speech units. Four combinations of modeling are possible : alternating the differentiation or fusion of simple and geminated consonants on the one hand and short and long vowels on the other hand. A set of perceptual and objective tests was conducted to evaluate the effect of the fourunit modelling approaches on the quality of the generated speech. The evaluations were made in the case of parametric synthesis by HMM then in the case of parametric synthesisby DNN. The subjective results showed that when the HMM approach is used, the four approaches produce signals with a similar quality, this result that was confirmed by the objective measures calculated to evaluate the prediction of the durations of the speech units. However, the results of objective evaluations in the case of the DNN approach have shown that the differentiation of simple consonants (respectively short vowels) geminated consonants (respectively long vowels) leads to a slightly better prediction of the durations than the other modelling approaches. On the other hand, this improvement was not perceived during the perceptive tests ; listeners found that the signals generated by the four approaches are similar in terms of overall quality. The last part of this thesis was devoted to the comparison of the synthesis approach by the HMMs to that by the DNNs.All the tests conducted have shown that the use of DNNs has improved the perceived quality of the generated signals.
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Amal Houidhek. Synthèse paramétrique de la parole Arabe. Traitement du signal et de l'image [eess.SP]. Université de Lorraine; Université de Tunis El Manar (Tunisie), 2020. Français. ⟨NNT : 2020LORR0116⟩. ⟨tel-03050597⟩

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