| 摘要 |
A musical tone synthesizing apparatus is used to synthesize musical-tone waveforms on the basis of simulation of a tone-generation mechanism of a musical instrument. Herein, a drive signal is generated based on an excitation envelope signal in accordance with a manipulation of performance made by a human operator (e.g., performer) and is then converted to an excitation signal in accordance with an operating behavior of the musical instrument. For example, the operating behavior indicates a behavior of a reed portion of a wind instrument to which breath is blown in; or it indicates a behavior of a string of a stringed instrument which is striken or plucked. The excitation signal is input to a physical-model sound source realizing resonating-body/vibrating-body models. The physical-model sound source performs calculations, simulating the tone-generation mechanism of the musical instrument, on the excitation signal to produce a musical tone signal. An amplitude envelope signal as well as an effect are imparted to the musical tone signal, thus providing a synthesized musical tone output. The excitation envelope signal and amplitude envelope signal are controlled in level in a variety of ways in response to an instruction to generate a next note during generation of a current note. For example, formation of an attack portion is started to follow a current level of the excitation envelope signal, whilst the amplitude envelope signal is damped in level to a damp level, then, formation of an attack portion is started to follow the damp level of the amplitude envelope signal. Thanks to the controlling of the envelope signals, it is possible to realize special techniques of performance such as one-note-by-one-note crescendo without causing delay in generation of notes.
|
