Digital signal generator for musical notes

Details Digital signal generator for musical notes Digital signal generator for musical notes

1985-01-24

1986-07-29

Perkey, William B.

Music

Instruments

364723, G10H 700, G06F 738

Patent

active

046025456

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.

REFERENCES:
patent: 4202234 (1980-05-01), Comerford
patent: 4205575 (1980-06-01), Hoskinson et al.
patent: 4224856 (1980-09-01), Ando et al.
patent: 4334281 (1982-06-01), Imazeki et al.
patent: 4536853 (1985-08-01), Kawamoto et al.
patent: 4539884 (1985-09-01), Aoki

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