Long duration aperiodic musical waveform generator

Details Long duration aperiodic musical waveform generator Long duration aperiodic musical waveform generator

1980-04-28

1984-04-17

Isen, Forester W.

Music

Instruments

84 119, 84 126, G10H 100

Patent

active

044427450

ABSTRACT:
This is an electronic organ which economically simulates long duration aperiodic musical waveforms, such as the clash of cymbals. It employs the digital waveform generation technique, in which successive instructions are read out of a memory to determine the amplitude of the waveform at successive sample points. To save memory capacity, the memory addresses are rescanned; and to avoid audible discontinuities the scan direction recirculates numerically back and forth across the address field. Despite the bidirectionality of the scan, monotonic decreases in amplitude and in higher harmonic content are achieved. The monotonic decrease in amplitude is accomplished by impressing an exponentially declining envelope upon the digitally generated amplitudes. The monotonic decrease in higher harmonic content is accomplished by preventing the rescan from returning to a memory region of greater harmonic content after it has once entered a region of lesser harmonic content.

REFERENCES:
patent: 3763364 (1973-10-01), Deutsch et al.
patent: 4184403 (1980-01-01), Whitefield
patent: 4383462 (1983-05-01), Nagai et al.

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