The contribution presents information on the experimental investigation of the glottal sound source with excised human larynges. The vocal fold vibrations were excited by airflow and monitored acoustically, electroglottographically as well as by means of laser vibrometry, pressure transducers, videokymography and stroboscopy techniques. The paper is focused on 1) presenting a method for monitoring non-linear vibration effects, when bifurcations appear during phonation by changing the tension of the vocal folds, and 2) on development of a method for casting laryngeal cavities using plaster and metal materials for determining the vocal fold shape in a defined phonation position.

Index Terms. Non-linear dynamics, bifurcation phenomena, laryngoscopy, videokymography, chest-falsetto jumps, vocal fold shape