Computational and Experimental Modelling of the Effekcts od Voice Therapy Using Tubes

0480483 - ÚT 2018 HK eng A - Abstrakt
Horáček, Jaromír - Radolf, Vojtěch - Laukkanen, A.M.
Computational and Experimental Modelling of the Effekcts od Voice Therapy Using Tubes.
AQL 2017 - The 12th International Conference on Advances in Quantitative Laryngology Voice and Speech Research. Hong Kong, 2017 - (Ma, E.; Yiu, E.). s. 3-43
[The 12th International Conference on Advances in Quantitative Laryngology, Voice and Speech Research. 17.10.2017-21.10.2017, The University of Hong Kong]
Grant CEP: GA ČR(CZ) GA16-01246S
Institucionální podpora: RVO:61388998
Klíčová slova: biomechanics of voice * impact stress measurement * glottal opening measurement * measurement of pre-collison velocity of vocal folds
Kód oboru RIV: BI - Akustika a kmity

Phonation into a tube with the distal end in air or submerged in water is used for voice therapy. This study explores the effective mechanisms of tube therapy.
Methods: A computer model was primarily used. The results were compared to those obtained with a physical model, consisting of silicone vocal folds and a plexiglass vocal tract, and to results that have been reported for humans. Loops of subglottic pressure Psub(t) versus area variation GA(t), which are difficult to obtain in humans, were costructed.
Results: F1 decreased 70% and F2 20% for phonation into a glass resonance tube (length 27 cm, inner diameter 7.8 mm) in air, compared to production of [u:]. Similar result was obtained with the physical model. F0 was set to 90-94 Hz, and F1 descended to 105 Hz, thus slightly above F0. Comparable conditions have been measured in humans during tube therapy. For tube with the distal end in water, F1 decreased 90%, reaching 28 Hz and 26 Hz in the experiment, where the water bubbling frequency Fb=19-24 Hz was jus below F1. Concordant results were obtained in earlier studies from humans. Loops of Psub(t) versus GA(t) clearly differentiate vowel phonation from both therapy methods and show a physical backgroud.
Conclusion: In both voice therapy method, the part of the airflow energy, utilizing the first acoustic resonance. Thus, less flow energy is needed to deliver to the self-sustained vibration of the vocal folds.
Trvalý link: http://hdl.handle.net/11104/0276467