Effects of vocal loading on the phonation and collision threshold pressures
2009 (English)In: Proceedings of Fonetik 2009: The XXIIth Swedish Phonetics Conference / [ed] Peter Branderud, Hartmut Traunmüller, Stockholm: Stockholm University, 2009, 24-27 p.Conference paper (Other academic)
Phonation threshold pressures (PTP) have been commonly used for obtaining a quantita-tive measure of vocal fold motility. However, as these measures are quite low, it is typically dif-ficult to obtain reliable data. As the amplitude of an electroglottograph (EGG) signal de-creases substantially at the loss of vocal fold contact, it is mostly easy to determine the colli-sion threshold pressure (CTP) from an EGG signal. In an earlier investigation (Enflo & Sundberg, forthcoming) we measured CTP and compared it with PTP in singer subjects. Re-sults showed that in these subjects CTP was on average about 4 cm H2O higher than PTP. The PTP has been found to increase during vocal fatigue. In the present study we compare PTP and CTP before and after vocal loading in singer and non-singer voices, applying a load-ing procedure previously used by co-author FP. Seven subjects repeated the vowel se-quence /a,e,i,o,u/ at an SPL of at least 80 dB @ 0.3 m for 20 min. Before and after the loading the subjects’ voices were recorded while they produced a diminuendo repeating the syllable /pa/. Oral pressure during the /p/ occlusion was used as a measure of subglottal pressure. Both CTP and PTP increased significantly after the vocal loading.
Place, publisher, year, edition, pages
Stockholm: Stockholm University, 2009. 24-27 p.
Computer Science Language Technology (Computational Linguistics)
IdentifiersURN: urn:nbn:se:kth:diva-52122ISBN: 978-91-633-4892-1ISBN: 978-91-633-4893-8OAI: oai:DiVA.org:kth-52122DiVA: diva2:465417
Fonetik, The XXIIth Swedish Phonetics Conference, June 10-12, 2009
tmh_import_11_12_14. QC 201112292011-12-142011-12-142011-12-29Bibliographically approved