Measurements on the effects of glottal opening and flow on the glottal impedance

A new method to measure the acoustical impedance of an artificial glottal orifice is presented. The plate with the orifice is mounted to one end of a tube resonator with the other end being open. The impedance of the orifice seen from the tract can be solved from the resonance frequencies and bandwidths. The frequency characteristic of the orifice is easily otained under different DC-flow conditions. The results show that under turbulent flow the effective glottal inductance is clearly only a fraction of its flowless value. The measured glottal resistance is close to the theoretical value given by Flanagan´s two-mass model.