title: Numerical instabilities and three-dimensional electromagnetic articulography.
abstract: The AG500 electromagnetic articulograph is widely used to reconstruct the movements of the articulatory organs. Nevertheless, some anomalies in its performance have been observed. It is well known that accuracy of the device is affected by electromagnetic interference and possible hardware failures or damage to the sensors. In this study, after eliminating any hardware or electromagnetic source of disturbance, a set of trials was carried out. The tests prove that anomalies in sensor position tracking are systematic in certain regions within the recording volume and, more importantly, show a specific pattern that can be clearly attributed to a wrong convergence of the calculation method.
authors.affiliation: Dipartimento di Matematica e Fisica Ennio De Giorgi - Università del Salento, via per Arnesano, 73100 Lecce, Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: Stella
authors.forename: Paolo
authors.initials: P
authors.lastname: Bernardini
authors.forename: Francesco
authors.initials: F
authors.lastname: Sigona
authors.forename: Antonio
authors.initials: A
authors.lastname: Stella
authors.forename: Mirko
authors.initials: M
authors.lastname: Grimaldi
authors.forename: Barbara Gili
authors.initials: BG
authors.lastname: Fivela
mesh_terms: D000465:Algorithms; D016477:Artifacts; D001696:Biomechanical Phenomena; D002138:Calibration; D003198:Computer Simulation; D055590:Electromagnetic Phenomena; D006801:Humans; D007568:Jaw / Q000502:physiology*; D017711:Nonlinear Dynamics; D009716:Numerical Analysis, Computer-Assisted; D010700:Phonetics; D015203:Reproducibility of Results; D013018:Sound Spectrography; D013060:Speech; D013062:Speech Articulation Tests / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D013997:Time Factors; D014159:Transducers