Envelope signal generating apparatus

Details Envelope signal generating apparatus Envelope signal generating apparatus

1990-11-29

1992-07-07

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84663, G10H 1057, G10H 700

Patent

active

051273047

ABSTRACT:
A differentiation circuit outputs a normalized time variable signal for each phase. This time variable signal is multiplied by a gain parameter by a multiplier, thus reproducing an AC amplitude level lost in normalization. The reproduced output is added to an amplitude parameter by an adder, thus reproducing a DC amplitude level lost in the normalization. A CPU reads out the parameters of the differentiation circuit and adder from an ROM, and writes them into a parameter memory. When phase-change data is detected, the content of the parameter memory is rewritten, thereby forcibly changing the phase.

REFERENCES:
patent: 4135424 (1979-01-01), Okamoto
patent: 4178826 (1979-12-01), Hiyoshi et al.
patent: 4185532 (1980-01-01), Hiyoshi et al.
patent: 4691608 (1987-09-01), Sasaki et al.
patent: 5038661 (1991-08-01), Kaneko

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