Publication detail

Numerical Modelling of Effect of Tonsillectomy on Production of Czech Vowels

ŠVANCARA, P. HORÁČEK, J.

English title

Numerical Modelling of Effect of Tonsillectomy on Production of Czech Vowels

Type

WoS Article

Language

en

Original abstract

Aim of the study is to numerically examine the effect of tonsillectomy on production of Czech vowels. Similar experimental studies on living subjects are not easily realisable. The finite element (FE) models of the acoustic spaces corresponding to the human vocal tracts and acoustic space around the human head are used in numerical simulations of phonation. Models for Czech vowels /a/, /e/, /i/, /o/ and /u/ are analyzed. The acoustic resonant characteristics of the FE models are studied using modal and transient analyses (excitation by a short pulse). The production of vowels is simulated in time domain using transient analysis of the FE models excited by Liljencrants-Fants (LF) glottal signal model. Calculated results show that tonsillectomy causes frequency shifts of some formant frequencies mostly down to lower frequencies. Biggest shifts were obtained for 3rd and 4th formants for vowel /o/ ~300Hz down to lower frequencies, for 3rd (~450Hz) and 4th (~150Hz) formants for vowel /u/ and for 4th (~200Hz) formant of vowel /e/ down too. The frequency shifts of the formants are significantly dependent on position and size of the tonsils.

Keywords in English

biomechanics of voice; formant frequencies; finite element modeling of voice

Released

2006-10-12

Publisher

S. Hirzel Verlag

ISSN

1610-1928

Volume

92

Number

5

Pages from–to

681–688

Pages count

8

BIBTEX


@article{BUT43721,
  author="Pavel {Švancara} and Jaromír {Horáček}",
  title="Numerical Modelling of Effect of Tonsillectomy on Production of Czech Vowels",
  journal="Acta Acustica united with Acustica",
  year="2006",
  volume="92",
  number="5",
  pages="681--688",
  issn="1610-1928"
}