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Seminar at Speech, Music and Hearing:

Comparing data derived from electroglottograms and from flow glottograms

Filipa Lã, University of Aveiro, Portugal


Closed quotient (Q_closed ), derived from flow glottograms and contact quotient (Q_contact ), derived from electroglottograms, are sometimes regarded as identical measures. Previous studies report differing results regarding how these parameters vary with vocal loudness (Sapienza & al., 1998). Moreover, differing definitions of Q_closed are commonly used (Herbst & Ternström, 2006). The present investigation aims to clarify how Q_closed and Q_contact (i) varies with subglottal pressure and (ii) is affected by phonatory parameters. Audio, electrolaryngograph, oral pressure and air flow were simultaneously recorded for five male singers, who were asked to repeat the syllable [pae] in diminuendos from loud to soft at various pitches. Q_closed was extracted by inverse filtering, whereas Q_contact was measured from electrolaryngography, using the Decap and SpeechStudio softwares, respectively. Subglottal pressure was measured in terms of the oral pressure during /p/ occlusion and different phonatory parameters were determined from the inverse filtered waveforms. Q_closed showed a positive correlation with Q_contact , but was mostly lower. Both varied systematically with subglottal pressure, but the variation was greater for Q_closed . Possible reasons for these differences will be discussed.

15:15 - 17:00
Tuesday January 31, 2012

The seminar is held in Fantum.

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Published by: TMH, Speech, Music and Hearing

Last updated: Wednesday, 23-Jun-2010 09:22:46 MEST