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Resonances and wave propagation velocity in the subglottal airways Steven M. Lulicha)
 

Summary: Resonances and wave propagation velocity in the subglottal airways
Steven M. Lulicha)
Department of Psychology Washington University Saint Louis MO 63130
Abeer Alwan and Harish Arsikere
Department of Electrical Engineering UCLA Los Angeles CA 90095
John R. Morton and Mitchell S. Sommers
Department of Psychology Washington University Saint Louis MO 63130
(Dated: August 12, 2011)
Previous studies of subglottal resonances have reported findings based on relatively few subjects,
and the relations between these resonances, subglottal anatomy, and models of subglottal acoustics
are not well understood. In this study, accelerometer signals of subglottal acoustics recorded during
sustained [a:] vowels of 50 adult native speakers (25 males, 25 females) of American English were
analyzed. The study confirms that a simple uniform tube model of subglottal airways, closed at the
glottis and open at the inferior end, is appropriate for describing subglottal resonances. The main
findings of the study are: 1) whereas the walls may be considered rigid in the frequency range of
Sg2 and Sg3, they are yielding and resonant in the frequency range of Sg1, with a resulting 4/3
increase in wave propagation velocity and, consequently, in the frequency of Sg1; 2) the `acoustic
length' of the equivalent uniform tube varies between 18 cm and 23.5 cm, and is approximately
equal to the height of the speaker divided by an empirically determined scaling factor; 3) trachea
length can also be predicted by dividing height by another empirically determined scaling factor;

  

Source: Alwan, Abeer - Electrical Engineering Department, University of California at Los Angeles

 

Collections: Computer Technologies and Information Sciences