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Three-dimensional electromagnetic articulography: a measurement principle
Tokihiko Kaburagi1, Kohei Wakamiya, Masaaki Honda
1Department of Acoustic Design, Faculty of Design, Kyushu University, 4 9 1 Shiobaru, Minami-ku, Fukuoka, 815 8540 Japan.
The Journal of the Acoustical Society of America
|August 27, 2005
Summary
This study presents a new measurement principle for a 3D electromagnetic articulography device. The method uses a multivariate B spline field function for accurate estimation of receiver coil position and rotation, achieving 0.2 mm precision.
Area of Science:
- Biomedical Engineering
- Electromagnetics
- Computational Geometry
Background:
- Accurate tracking of articulatory movements is crucial for understanding speech production.
- Existing electromagnetic articulography (EMA) systems face challenges in achieving high precision and flexibility.
Purpose of the Study:
- To present a novel measurement principle for a 3D electromagnetic articulographic device.
- To enhance the accuracy and flexibility of EMA systems for articulatory movement analysis.
Main Methods:
- Utilizing a multivariate B spline function to model the magnetic field distribution.
- Employing an iterative procedure to estimate the receiver coil's state (position and rotation).
- Comparing nonlinear programming techniques, favoring the Marquardt method.
Main Results:
- The B spline field function allows for flexible and accurate representation of magnetic fields.
- The system achieved a measurement accuracy of approximately 0.2 mm under preliminary conditions.
- The Marquardt method proved superior for solving the nonlinear estimation problem.
Conclusions:
- The proposed measurement principle enables high-precision 3D articulography.
- The B spline-based approach offers superior accuracy and flexibility compared to traditional methods.
- This technology has significant potential for research in speech science and related fields.