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Computational Processing of the Portuguese Language

Volume 7243 of the series Lecture Notes in Computer Science pp 318-328

Production and Modeling of the European Portuguese Palatal Lateral

  • António TeixeiraAffiliated withDETI/IEETA, University of Aveiro
  • , Paula MartinsAffiliated withESSUA/IEETA, University of Aveiro
  • , Catarina OliveiraAffiliated withESSUA/IEETA, University of Aveiro
  • , Augusto SilvaAffiliated withDETI/IEETA, University of Aveiro

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Abstract

In this study, an articulatory characterization of the palatal lateral is provided, using MRI images of the vocal tract acquired during the production of /L/ by several speakers of European Portuguese. The production of this sound involves: a complete linguo-alveolopalatal closure; inward lateral compression of the tongue and a convex shape of the posterior tongue body, allowing airflow around the sides of the tongue; large cross-sectional areas in the upper pharyngeal and velar regions. The lengths and area functions derived from MRI are analysed and used to model the articulatory-acoustic relations involved in the production of /L/. The results obtained in the first simulations show that the vocal-tract model (VTAR) is reasonably able to estimate the frequencies of the first formants and zeros. The lateral channels combined with the supralingual cavity create pole-zero clusters around and above F3, in the frequency range of 2-4.5 kHz.

Keywords

European Portuguese magnetic ressonance palatal lateral acoustic modeling