Contexte et nature des réalisations phonétiques en parole conversationnelle (Context and nature of phonetic realizations in conversational speech) [in French]

________________________________________________________________________________________________________ Context and nature of phonetic realizations in conversational speech Since a decade, research in phonetics has turned with interest to the description of large corpora of casual speech. This new field of research opens up many opportunities but asks also new questions for phoneticians. Firstly, this paper evaluates the lexical and phonological context in which phonetic realizations are produced. This context is noticeably different from lexical context in constructed corpora. Next, we address the question of phonetic annotation which is critical for phonetic analyses. Finally, we discuss some specific cases of phonetic reduction which offer new perspectives for our interpretations of speech production. MOTS-CLES : parole spontanée, grands corpus, données lexicales, annotation phonétique, alignement automatique, réduction phonétique.