| 摘要 |
A music synthesizer simulates the musical tones of wind instruments. The synthesizer includes a vopex noise generator, an edge tone nonlinearity function driven by the differential between a blowing pressure signal and a feedback signal from the resonator. The vopex noise generator feeds its noise output signal back into itself so as to generate a noise "votex". The vopex noise generator furthermore modulates the spectral content of the generated noise fluctuates in a manner that is period synchronous with the resonator output signal. As a result, the noise vopex signals mimic the turbulence associated with air blown into wind instruments by switching between structured and chaotic modes of operation in a manner that is period synchronous with the resonator output signal. The transfer characteristic of the edge tone nonlinearity function is dynamically controlled by the noise signal so as to change the operating point of the edge tone nonlinearity. Since the noise signal is changing in a manner that is period synchronous with the resonator output signal, the transfer characteristic of the edge tone nonlinearity function is also dynamically modulated in a manner that is period synchronous with the resonator output signal. The resulting period synchronously modulated edge tone signal is injected into the resonator, creating microvariations in the amplitude and frequency of the output signal generated by the resonator, thereby mimicking the noise component of the sounds produced by acoustic wind instruments.
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