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Numerical instabilities and three-dimensional electromagnetic articulography.

Massimo Stella¹, Paolo Bernardini, Francesco Sigona

¹Dipartimento di Matematica e Fisica Ennio De Giorgi - Università del Salento, via per Arnesano, 73100 Lecce, Italy.

The Journal of the Acoustical Society of America

|December 13, 2012

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The AG500 electromagnetic articulograph shows systematic errors in sensor tracking due to calculation method convergence issues, not hardware or interference. This impacts articulatory organ movement reconstruction accuracy.

Area of Science:

Biomechanics
Speech Science
Instrumentation

Background:

Electromagnetic articulography (AG500) is crucial for mapping articulatory organ movements.
Observed performance anomalies in AG500 devices necessitate investigation.
Potential causes include electromagnetic interference, hardware failure, or sensor damage.

Purpose of the Study:

To identify the root cause of AG500 performance anomalies.
To determine if errors stem from external factors or the device's internal processing.
To characterize systematic errors in sensor position tracking.

Main Methods:

Systematic trials were conducted with the AG500 electromagnetic articulograph.
Hardware and electromagnetic interference sources were meticulously excluded.

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Sensor position tracking data was analyzed for systematic anomalies and patterns.

Main Results:

Performance anomalies persisted even after eliminating hardware and electromagnetic interference.
Systematic errors were identified in specific regions of the recording volume.
These anomalies exhibited a distinct pattern attributable to calculation method convergence errors.

Conclusions:

The AG500's systematic tracking anomalies are primarily caused by flawed calculation method convergence.
Hardware and electromagnetic interference are not the primary sources of these specific errors.
Understanding these systematic errors is vital for improving articulography accuracy.