Abstract
The hypothesis tested was that the lung pressure required for multiphonic vocal sound sources (some combinations of true folds, false folds, aryepiglottis folds, tongue base, velum, lips) is the sum of all the individual threshold pressures. The approach was strictly computational. Fluid transport and wave propagation in the airways were produced by an abbreviated Navier–Stokes solution. Each of the sound sources was modeled with three narrow 0.2 cm sections having viscous and elastic wall properties that could oscillate in isolation. The length of the supraglottal vocal tract was 17.5 cm. The simulation was used to compute phonation threshold pressure, radiated power from the mouth, degree of aperiodicity, and glottal efficiency.
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