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  Contents > Previous page > Article detail print Order
o Issue N# 1 - 2012 o

PHONIATRICS

Influence of phonetic context on the dysphonic event: Contribution of new methodologies for the analysis of pathological voice


Authors : Revis J, Galant C, Fredouille C, Ghio A, Giovanni A. (Marseille)

Ref. : Rev Laryngol Otol Rhinol. 2012;133,1:33-40.

Article published in english
Downloadable PDF document english



Summary : Widely studied in terms of perception, acoustics or aero­dynamics, dysphonia stays nevertheless a speech phenomenon, closely related to the phonetic composition of the message conveyed by the voice. In this paper, we present a series of three works with the aim to understand the implications of the phonetic manifestation of dysphonia. Our first study proposes a new approach to the perceptual analysis of dysphonia (the phonetic labeling), which principle is to listen and evaluate each phoneme in a sentence separately. This study confirms the hypothesis of Laver [11] that the dysphonia is not a constant noise added to the speech signal, but a discontinuous pheno­me­non, occurring on certain phonemes, based on the phonetic context. However, the burden of executing the task has led us to look to the techniques of automatic speaker recogni­tion (ASR) to automate the procedure. With the collaboration of the LIA, we have developed a system for automatic classifica­tion of dysphonia from the techniques of ASR. This is the subject of our second study. The first results obtained with this system suggest that the unvoiced consonants show predominant performance in the task of automatic classification of dysphonia. This result is surprising since it is often assumed that dysphonia occurs only on laryngeal vibration. We started looking for explana­tions of this phenomenon and we present our assumptions and experiences in the third work we present.

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