Waveshape generator for electronic musical instruments

Details Waveshape generator for electronic musical instruments Waveshape generator for electronic musical instruments

1978-10-30

1981-01-27

Witkowski, Stanley J.

Music

Instruments

84 101, 84 119, G10H 108, G10H 700

Patent

active

042468230

ABSTRACT:
In a wave shape generator of the memory reading type, a waveshape memory stores sample values of a wave each value being represented by an integral address. A coefficient memory stores coefficients for nth order interpolation. Unknown intermediate sample values not stored in the wave shape memory represented by non-integral addresses and are approximated by multiplication of stored sample values of the waveshape and corresponding coefficient values on the basis of nth order interpolation. Use of the interpolation method assures smoothness of the wave shape with respect to time and thereby minimizes quantization noise while permitting use of relatively small memories.

REFERENCES:
patent: 3809789 (1974-05-01), Deutsch
patent: 3888153 (1975-06-01), Deutsch
patent: 3982460 (1976-09-01), Obayashi et al.
patent: 3982461 (1976-09-01), Kugisawa
patent: 4127047 (1978-11-01), Tomisawa
patent: 4133241 (1979-01-01), Niimi et al.

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