Music – Instruments – Electrical musical tone generation
Patent
1996-09-13
1998-04-28
Cabeca, John W.
Music
Instruments
Electrical musical tone generation
84605, 84661, G10H 700
Patent
active
057447390
ABSTRACT:
A variable sample rate approximation technique is used for coding and recreating musical signals in a wavetable synthesizer. Many sounds inherently include one large fast transfer of energy followed by vibrations that dampen over time so that the bandwidth requirement of a musical sound is reduced with passing time. Using the variable sample rate approximation technique, musical sounds are classified into two categories, sustaining sounds and percussive sounds. A sustaining instrument creates a noisy stimulus then sustains the sound created by the noisy stimulus. A percussive instrument is also a noisy source and generates a sound signal having high frequencies that decay rapidly while sustaining instruments sustain at all frequencies nearly equally. The sustaining and percussive instruments have substantially different waveform characteristics but present similar conditions with respect to memory reduction. Similarities between the acoustical characteristics of sustaining sounds and percussive sounds are exploited using a variable sampling rate technique to substantially reduce the memory budget of a wavetable synthesizer.
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Cabeca John W.
Crystal Semiconductor
Donels Jeffrey W.
Koestner Ken J.
Violette J. P.
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