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Vocal fold collision threshold pressure: An alternative to phonation threshold pressure?
KTH, Royal Institute of Technology, Stockholm, Sweden. (Department of Speech, Language and Hearing)
KTH, Royal Institute of Technology, Stockholm, Sweden. (Department of Speech, Music and Hearing)
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 [en]

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
Informa Healthcare, 2009. Vol. 34, no 4, 210-217 p.
Keyword [en]
Electroglottography, fundamental frequency, phonation threshold, singing, vocal fold contact, vocal warm-up
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-87905DOI: 10.3109/14015430903382789OAI: oai:DiVA.org:liu-87905DiVA: diva2:600909
Available from: 2013-01-28 Created: 2013-01-28 Last updated: 2017-12-06
In thesis
1. Collision Threshold Pressure: A novel measure of voice function Effects of vocal warm-up, vocal loading and resonance tube phonation in water
Open this publication in new window or tab >>Collision Threshold Pressure: A novel measure of voice function Effects of vocal warm-up, vocal loading and resonance tube phonation in water
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The phonation threshold pressure (PTP), i.e., the smallest amount of subglottal pressure needed to initiate and sustain vocal fold oscillation, is frequently difficult to measure due to the difficulty for some subjects to produce extremely soft phonation. In addition, PTP values are often quite scattered. Hence, the collision threshold pressure (CTP), i.e., the smallest amount of subglottal pressure needed for vocal fold collision, was explored as a possible complement or alternative to PTP. Effects on CTP and PTP of vocal warm-up (Paper 1), resonance tube phonation with the tube end in water (Paper 2), and vocal loading (Paper 3) were investigated. With the aim to accelerate the CTP measurement process, comparisons were made between CTP values derived manually and those derived by several automatic or semi-automatic parameters (Paper 4).

Subjects were recorded at various F0 while phonating /pa:/-sequences, starting at medium loudness and continuing until phonation ceased. Subglottal pressure was estimated from oral pressure signals during the /p/ occlusion. Vocal fold contact was determined manually from the amplitude of the electroglottographic (EGG) signal (Papers 1 and 3) or its first derivative (dEGG) (Papers 2 and 4).

Recordings were made before and after exercise: (Paper 1) Vocal warm-up was carried out in the 13 singers’ own habitual way. (Paper 2) Twelve mezzo-sopranos phonated on /u:/ at various pitches for two minutes before post-recording, and 15 seconds before each additional F0, into a glass tube (l=27 cm, id=9 mm) at a water depth of 1-2 cm.

(Paper 3) Five trained singers and five untrained subjects repeated the vowel sequence /a,e,i,o,u/ at a Sound Pressure Level of at least 80 dB at 0.3 m for 20 minutes.

Statistically significant results: (Paper 1) CTP and PTP decreased after warm-up in the five female voices. CTP was found to be higher than PTP (about 4 H2O). Also, CTP had a lower coefficient of variation, suggesting that CTP is a more reliable measure than PTP. (Paper 2) CTP increased on average six percent after resonance tube phonation in water.

(Paper 3) CTP and PTP increased after the vocal loading in the untrained voices, with an average after-to-before ratio of 1.26 for CTP and 1.33 for PTP.

(Paper 4) Automatically derived CTP values showed high correlation with those obtained manually, from EGG spectrum slope, and from the visual displays of dEGG and of dEGG wavegram.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 40 p.
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1322
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-91365 (URN)978-91-7519-815-6 (ISBN)
Public defence
2013-05-24, Eken, Campus US, Linköpings universitet, Linköping, 09:00 (English)
Opponent
Supervisors
Available from: 2013-04-23 Created: 2013-04-23 Last updated: 2015-09-22Bibliographically approved

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Enflo, Laura

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