The larynx acts as a sound generator by rapidly opening and closing the airway and interrupting the breath stream. Initiated by an increase in subglottic pressure caused by adducted vocal folds during exhalation. The elastic properties of the larynx and resting adduction forces reapproximate the vocal folds. This cycle is repetitive and cycles about every 10 milliseconds. Subglottic pressure drives the cords open, this aeorstatic force is maximum at the beginning of each cycle.
Subglottic anatomy is configured to produce a bernouli effect at the glottis.
The elastic properties of the vocal folds permit aerodynamic forces to cycle. The tension in the vocal ligaments restore the focal folds to their original adducted position. Stretching the folds or by changing the stiffness with contraction of the vocal muscles. Bow string analogy. An acoustical property.