Abstract
Effects of mass imbalance of the vocal cords on the voice and vibratory pattern of the vocal cords were investigated with excised larynges of dogs and also human larynges obtained at the time of autopsy. In general, mass imbalance of the vocal cord produces a phase shift and a difference in amplitude. The weighted vocal cord revealed a lag in phase and vibrated with reduced amplitude. In this case, the frequency of vibration was bilaterally the same with no hoarseness.
Vibratory patterns of the vocal cord in a state of mass imbalance were compared with vibrations synthesized by a computer simulation of a dynamic theoretical model of the vocal cords. Experimental findings were consistent with the results of the computer simulation.
