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Vocal fold collision threshold pressure: An alternative to phonation threshold pressure?
KTH, School of Computer Science and Communication (CSC), Speech, Music and Hearing, TMH, Speech Communication and Technology.
KTH, School of Computer Science and Communication (CSC), Speech, Music and Hearing, TMH, Speech Communication and Technology.
2009 (English)In: Logopedics, Phoniatrics, Vocology, ISSN 1401-5439, E-ISSN 1651-2022, Vol. 34, no 4, 210-217 p.Article in journal (Refereed) Published
Abstract [et]

Phonation threshold pressure (PTP), frequently used for characterizing vocal fold properties, is often difficult to measure. This investigation analyses the lowest pressure initiating vocal fold collision (CTP). Microphone, electroglottograph (EGG), and oral pressure signals were recorded, before and after vocal warm-up, in 15 amateur singers, repeating the syllable /pa:/ at several fundamental frequencies with gradually decreasing vocal loudness. Subglottal pressure was estimated from oral pressure during the p-occlusion, using the audio and the EGG amplitudes as criteria for PTP and CTP. The coefficient of variation was mostly lower for CTP than for PTP. Both CTP and PTP tended to be higher before than after the warm-up. The results support the conclusion that CTP is a promising parameter in investigations of vocal fold characteristics.

Place, publisher, year, edition, pages
2009. Vol. 34, no 4, 210-217 p.
Keyword [en]
Electroglottography, fundamental frequency, phonation threshold, singing, vocal fold contact, vocal warm-up
National Category
Fluid Mechanics and Acoustics Classical Archaeology and Ancient History
Identifiers
URN: urn:nbn:se:kth:diva-24331DOI: 10.3109/14015430903382789ISI: 000273202600009Scopus ID: 2-s2.0-72049133180OAI: oai:DiVA.org:kth-24331DiVA: diva2:346588
Note
QC 20100923Available from: 2010-09-01 Created: 2010-09-01 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Alternative Measures of Phonation: Collision Threshold Pressure and Electroglottographic Spectral Tilt: Extra: Perception of Swedish Accents
Open this publication in new window or tab >>Alternative Measures of Phonation: Collision Threshold Pressure and Electroglottographic Spectral Tilt: Extra: Perception of Swedish Accents
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The collision threshold pressure (CTP), i.e. the smallest amount of subglottal pressure needed for vocal fold collision, has been explored as a possible complement or alternative to the now commonly used phonation threshold pressure (PTP), i.e. the smallest amount of subglottal pressure needed to initiate and sustain vocal fold oscillation. In addition, the effects of vocal warm-up (Paper 1) and vocal loading (Paper 2) on the CTP and the PTP have been investigated. Results confirm previous findings that PTP increases with an increase in fundamental frequency (F0) of phonation and this is true also for CTP, which on average is about 4 cm H2O higher than the PTP. Statistically significant increases of the CTP and PTP after vocal loading were confirmed and after the vocal warm-up, the threshold pressures were generally lowered although these results were significant only for the females. The vocal loading effect was minor for the two singer subjects who participated in the experiment of Paper 2.

In Paper 3, the now commonly used audio spectral tilt (AST) is measured on the vowels of a large database (5277 sentences) containing speech of one male Swedish actor. Moreover, the new measure electroglottographic spectral tilt (EST) is calculated from the derivatives of the electroglottographic signals (DEGG) of the same database. Both AST and EST were checked for vowel dependency and the results show that while AST is vowel dependent, EST is not.

Paper 4 reports the findings from a perception experiment on Swedish accents performed on 47 Swedish native speakers from the three main parts of Sweden. Speech consisting of one sentence chosen for its prosodically interesting properties and spoken by 72 speakers was played in headphones. The subjects would then try to locate the origin of every speaker on a map of Sweden. Results showed for example that the accents of the capital of Sweden (Stockholm), Gotland and southern Sweden were the ones placed correctly to the highest degree.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 46 p.
Series
Trita-CSC-A, ISSN 1653-5723 ; 2010:11
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-24335 (URN)978-91-7415-712-3 (ISBN)
Presentation
2010-09-20, Fantum, Lindstedtsvägen 24, Stockholm, 15:15 (Swedish)
Opponent
Supervisors
Note
QC 20100915Available from: 2010-09-15 Created: 2010-09-01 Last updated: 2010-09-23Bibliographically approved

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