| 摘要 |
PURPOSE:To vary musical sound to be synthesized by a control signal supplied from the outside by adjusting the feedback ratio of the feedback path of an excitation meant corresponding to the control sagnal. CONSTITUTION:In a musical sound synthesizer in which a natural musical instrument is simulated, a signal is circulated between an excitation part 1 and a waveguide network 2, and a circulating signal is fetched as a musical sound signal. In such a case, nonlinear amplification by nonlinear circuits 104 and 106 is performed, and also, a negative feedback operation by the feedback ratio beta is performed. Therefore, hysteresis occurs in the input/output characteristic of the excitation part 1 i.e., the output change of a multiplier 108 against the input change of an adder 101, and the width of such hysteresis is increased as increasing the feedback ratio beta. For example, when the feedback ratio is increased by increasing a signal P corresponding to blowing pressure, a resonance frequency and the waveform of the input signal of the waveguide network 2 can be varied, and pitch height and a tone color can be varied. |
