Periodic wave form generation by recyclically reading amplitude

Details Periodic wave form generation by recyclically reading amplitude Periodic wave form generation by recyclically reading amplitude

1986-10-31

1987-08-04

Witkowski, S. J.

Music

Instruments

84 113, 364419, 364718, G10H 102, G10H 700

Patent

active

046837957

ABSTRACT:
An electronic musical instrument includes a memory in which digital samples of an aperiodic waveform are stored. Digital samples stored in a first portion of the memory represent a rapidly rising portion of the waveform and those stored in a second portion of the memory represent a rapidly declining portion of the waveform whose amplitude and spectral energy distributions are equalized. The first memory portion is addressed in forward scan and subsequently the second memory portion is addressed recyclically in forward and rearward scans to generate an output waveform having a first part corresponding to the rising waveform section and a second part corresponding to a series of the recyclically addressed versions of the equalized waveform section. After delivery of the first part of the output waveform, a monotonically declining envelope is impressed upon the amplitudes and the spectral energy distributions of the second part.

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