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Vocal tract area function for vowels using three-dimensional magnetic resonance imaging. A preliminary study
Philippe Clément1, Stéphane Hans, Dana M Hartl
1Department of Otorhinolaryngology-Head and Neck Surgery, Hôpital du Val de Grâce, Paris, France. phclement@wanadoo.fr
Summary
Magnetic resonance imaging (MRI) can determine vocal tract (VT) area function in male speakers. This noninvasive technique images VT shapes to calculate formant frequencies, aiding speech production research.
Area of Science:
- Acoustic phonetics and biomedical imaging.
- Utilizes magnetic resonance imaging (MRI) for vocal tract (VT) analysis.
Background:
- Understanding vocal tract (VT) area function is crucial for speech production.
- Previous methods for VT area function determination were limited.
Observation:
- MRI scans captured vocal tract shapes during sustained French vowels /i/, /a/, /u/.
- Cross-sectional areas were measured along the VT length.
- These measurements were used to create a VT model for acoustic simulation.
Findings:
- Calculated formant frequencies (F1, F2, F3) from the MRI-derived VT model showed discrepancies with natural formant frequencies.
- Differences varied depending on whether piriform sinuses were included in the model.
- The study identified potential sources of error, including articulation variability and boundary assessment challenges.
Implications:
- Magnetic resonance imaging (MRI) is a viable noninvasive tool for vocal tract (VT) imaging and area function determination.
- Findings contribute to more accurate speech synthesis and understanding of speech disorders.
- Further research is needed to refine VT modeling and account for anatomical variations.
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