Envelope generator for electronic musical instrument

Details Envelope generator for electronic musical instrument Envelope generator for electronic musical instrument

1993-10-26

1995-05-02

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84663, G10H 1057

Patent

active

054121558

ABSTRACT:
An envelope generator for an electronic musical instrument, in which a current value of the envelope approaching asymptotically to a target level, using a subtracter means for subtracting from data representing the target level in a floating point representation, data representing the difference between the target level and the current value in a floating point representation with deeming these data as fixed point data each having a decimal point between an exponent part and a fractional part, and a comparator for comparing the output of the subtracter means with a predetermined constant, and for judging that an envelope phase transfer condition is met if the output of the subtracter is greater than the constant. The envelope generator can achieve a phase transfer control function substantially similar to prior art envelope generators by a small amount of hardware.

REFERENCES:
patent: 4144789 (1979-03-01), Deutsch
patent: 4421003 (1983-12-01), Kondo
patent: 4953437 (1990-09-01), Starkey

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