ISCA Archive MAVEBA 2005
ISCA Archive MAVEBA 2005

Numerical modelling of effect of tonsillectomy on production of Czech vowels /a/ and /i/

P. Švancara, Jaromír Horáček

Aim of this study is to numerically examine the effect of tonsillectomy on production of Czech vowels /a/ and /i/. Similar experimental studies are not easily realisable on living subjects. The finite element (FE) models of the acoustic spaces corresponding to the human vocal tract for the Czech vowels /a/ and /i/ and acoustic space around the human head are used in numerical simulations of phonation. 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 FE model excited by Liljencrants-Fant’s (LF) glottal signal model. Calculated results show that tonsillectomy causes significant frequency shifts down to lower frequencies for 2nd (down by ~40Hz) and 4th (down by ~120Hz) formants for the vowel /a/, and similar shifts for 2nd (down by ~100Hz) and 4th (down by ~50Hz) formants for the vowel /i/. The frequency shifts of formants after tonsillectomy significantly depends on position and size of the tonsils.


Cite as: Švancara, P., Horáček, J. (2005) Numerical modelling of effect of tonsillectomy on production of Czech vowels /a/ and /i/. Proc. Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 2005), 151-154

@inproceedings{svancara05_maveba,
  author={P. Švancara and Jaromír Horáček},
  title={{Numerical modelling of effect of tonsillectomy on production of Czech vowels /a/ and /i/}},
  year=2005,
  booktitle={Proc. Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 2005)},
  pages={151--154}
}