Compressible and incompressible factors in the modeling of voiced fricative speech production
- When?
- Wednesday 19 May 2010, 16:00 to 17:00
- Where?
- 24AA04
- Open to:
- Staff, Students
- Speaker:
- Philip Jackson (CVSSP, Surrey)
Abstract: The aeroacoustic generation of turbulence noise in voiced fricative speech sounds (e.g., /z/, /v/) offers an intriguing practical example of compressible and incompressible fluid flow inside the vocal tract. In fricatives, air flowing into the tract through the larynx passes through a narrow constriction, e.g. made by the tongue, where it forms a jet.
Sound is generated by turbulence in the jet principally as it impinges on an obstacle downstream, such as the teeth, and radiates from the mouth. In voiced fricatives, all this occurs while the flow is pulsed by vibration of the vocal folds, leading to an interaction between aerodynamic and acoustic behaviour. This talk will present a review of observed behaviour and some existing simple models that describe key characteristics of the radiated acoustic signal. It is anticipated that better numerical simulation may be obtained through application of Euler’s equations, the Navier-Stokes equations or some approximation.
