| 摘要 |
When playing a wind instrument such as a clarinet, noises are inevitably or intentionally generated under effect of a turbulent flow contained in an air-pressure wave propagated through a resonance tube of the wind instrument. In response to an accurate simulation of a noise behavior, particularly, a behavior of the turbulent flow contained in the air-pressure wave, a musical tone synthesizing apparatus artificially produces a noise signal by use of a white-noise signal having the predetermined uniform spectral distribution. Herein, frequency characteristic and amplitude characteristic of this noise signal are controlled to be varied in response to an excitation signal which is created responsive to performance information representing the breath pressure applied to a mouthpiece of the wind instrument. This excitation signal is delayed by the predetermined delay time while it is circulating through a loop circuit. In addition, the signal circulating through the loop circuit is convoluted with the noise signal so as to produce a musical tone signal. Then, the musical tones with desirable noises are produced on the basis of this musical tone signal. Thus, the musical tone synthesizing apparatus well simulates the sound-and-noise-generating mechanism of the wind instrument.
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