Digital signal generator for musical notes
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United States of America Patent
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Jul 29, 1986
Grant Date -
N/A
app pub date -
Jan 24, 1985
filing date -
Jan 24, 1985
priority date (Note) -
Expired
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Abstract
A digital tone generator for a keyboard electronic musical instrument is described. The generator is of the waveshape memory type and repetitively interpolates between successive stored sample points thereby to effectively multiply the number of samples representing the waveshape so as to produce an output tone signal having reduced quantization error. Envelope errors are minimized by using cascade-connected multiplying digital-to-analog converters for multiplying the waveshapes derived from the interpolation with digital signals representative of an envelope waveshape. The system also includes a novel modification of a known multiplying digital-to-analog converter which greatly increases its speed of operation and makes possible the generation of clean output tone signals at the extremely high bit rates required to accomplish the interpolation.
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