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M/F PhD student "Aeroacoustic and phonetic study of sound source interactions in speech"

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : vendredi 3 juin 2022

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General information

Reference : UMR5519-NATLAW-014
Workplace : GIERES
Date of publication : Friday, May 13, 2022
Scientific Responsible name : Annemie VAN HIRTUM
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

PhD subject is funded in the framework of the 80 Prime project "InteracSon". This is a collaborative project between LEGI (UGA, Grenoble) and LPP (Sorbonne Nouvelle, Paris). The thesis will take place mainly at LEGI (UGA campus, Grenoble) with regular visits to LPP (Paris).
The production of speech sounds depends on sound sources of different nature. Voiced sounds involve the self-oscillation of the vocal cords, where the fluid-structure interaction between the deformable tissues of the vocal cords and the airflow from the lungs is the main sound source. Unvoiced sounds, on the other hand, depend on an aero-acoustic sound source located in the vocal tract. While physical and phonetic studies deal with both types of sound sources, their dynamics and interaction - the onset, maintenance, cessation or coexistence - are poorly studied. In this interdisciplinary project, it is proposed to study the dynamics and interaction of the sound sources in order to propose a phonetic-physical model validated on mechanical models that allows to explain the phonetic signals observed during normal speech (including voiced plosives and fricatives) and pathological speech (Parkinson's disease) thanks to a close collaboration between phoneticians (LPP) and physicists (LEGI).

Main activities :
Physical experiments on an original simplified model: Measurement and analysis of the flow field and acoustic field for physical conditions relevant to human speech (LPP collaboration),
- Modelling of aerodynamic and aeroacoustic data and validation of physical experiments,
- Cross-validation and analysis of the parameters obtained for different conditions observed on speakers (LPP collaboration) and on the models.

Detailed description :

Work Context

The Laboratory of Geophysical and Industrial Discharges (LEGI) is a joint research unit (UMR 5519) of the National Centre for Scientific Research (CNRS), the National Polytechnic Institute of Grenoble (Grenoble INP), and the University of Grenoble-Alpes (UGA). The LEGI carries out a wide range of activities with a common core of competences: research in fluid mechanics and transfer.
The research is done in the framework of the interdisciplinary 80 Prime project "InteracSon" gathering researchers of both LPP (Paris) and LEGI (Grenoble). The PhD-student will be benefit from the collaboration with researchers in phonetics (LPP) and in fluid mechanics (LEGI). As the PhD will be mainly located at LEGI. The collaboration with LPP is done using regular meetings (visio and visits) as well as some longer stays at LPP in order to work on the human data as well as their analysis.
At LEGI, it is aimed to perform a physical investigation for original simplified conditions for conditions relevant to human speech (LPP collaboration). Both theoretical and experimental results are expected.
Next, a cross-validation and analysis of the parameters obtained for different conditions observed on speakers (LPP collaboration), on the physical experiments and on the model outcome is assessed.
The PhD will collaborate intensively with the following researchers:
Didier Demolin (LPP, prof)
Xavier Pelorson (LEGI, DR CNRS)
Annemie Van Hirtum (LEGI, DR CNRS)

Constraints and risks

No particular risk

Additional Information

Highly motivated students with a degree (master's or 5-year engineering degree expected in the academic year 2021-2022) in fluid mechanics, (aero)acoustics, physics or applied mathematics can apply by sending a CV, academic results (master's level) and a cover letter.

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