Method and apparatus for reading selected waveform segments from memory
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United States of America Patent
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Nov 16, 1993
Grant Date -
N/A
app pub date -
Nov 9, 1990
filing date -
Nov 9, 1990
priority date (Note) -
Expired
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Abstract
An electronic musical instrument having fewer note generators than notes stores in a sequentially addressable memory different waveform segments corresponding to different sounds. The note generators are time multiplexed by a processor, and use end addresses of current waveform segments to determine whether each current sample to be read is within the desired waveform segment. This limits the ability to noiselessly and rapidly move between segments. It is accommodated by storing a copy of the waveform segments in a readily shifted direction for immediate playout and subsequent shift to the destination waveform segment while reading the copy. This allows for cluster switching and scanning of waveform cycles to control a modulation of the base note, such as attack or tremulant, independently of the base note pitch.
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