Abstract
The relationship between the physiological parameters and the acoustic output of the voice source is complex, and even more so when voiced obstruents are considered. Standard models assume that the subglottal pressure is divided across the glottis and the supraglottal constriction, which explains both the weaker noise source of voiced compared to voiceless fricatives and the tendency of voiced stops and fricatives to devoice. However, such models do not take into account small adjustments in vocal fold posture that may, for example, decrease the phonation threshold pressure, or in the constriction that may act to optimize noise production. Larger adjustments are made for voiced fricatives, such as lowering the larynx and advancing the tongue root, that may also enhance a speaker's ability to produce both voice and noise sources at a given subglottal pressure. In this talk results from a wide range of studies will be considered to arrive at a more nuanced understanding of the interaction of two source mechanisms in voiced obstruents.
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