14thAnnual Conference of the International Speech Communication Association

Lyon, France
August 25-29, 2013

Investigating the Relationship Between Glottal Area Waveform Shape and Harmonic Magnitudes Through Computational Modeling and Laryngeal High-Speed Videoendoscopy

Gang Chen, Robin A. Samlan, Jody Kreiman, Abeer Alwan

University of California at Los Angeles, USA

The glottal open quotient (OQ) is often associated with the amplitude of the first source harmonic relative to the second (H1*-H2*), which is assumed to be one cause of a change in vocal quality along a breathy-to-pressed continuum. The association between OQ and H1*-H2* was investigated in a group of 5 human subjects and also in a computational voice production simulation. The simulation incorporated a parametric voice source model into a nonlinear sourcefilter framework. H1*-H2* and OQ were measured synchronously from audio recordings and high-speed laryngeal videoendoscopy of "glide" phonations in which quality varied continuously from breathy to pressed. Analyses of individual speakers showed large differences in the relationship between OQ and H1*-H2*. The variability in laryngeal high-speed data was consistent with simulation results, which showed that the relationship between OQ and H1*- H2* depended on mean glottal area, a parameter associated with the degree of source-filter interaction and not directly measurable from high-speed video of the vocal folds. In addition, H1*-H2* may change with increasing glottal gap size; this change contributes to the observed variability in the relationship between H1*-H2* and OQ.

Full Paper

Bibliographic reference.  Chen, Gang / Samlan, Robin A. / Kreiman, Jody / Alwan, Abeer (2013): "Investigating the relationship between glottal area waveform shape and harmonic magnitudes through computational modeling and laryngeal high-speed videoendoscopy", In INTERSPEECH-2013, 3216-3220.