Envelope control system for electronic musical instrument

Details Envelope control system for electronic musical instrument Envelope control system for electronic musical instrument

1981-11-24

1984-06-12

Isen, Forester W.

Music

Instruments

84 126, G10H 106

Patent

active

044534400

ABSTRACT:
Frequency data read out from a frequency data conversion ROM in response to a key code generated at a keyboard according to a depressed note key is accumulated at an accumulator and the accumulated result is supplied to an A input terminals of an adder. On the other hand, envelope data generated by an envelope data generating circuit is supplied to a B input terminal of the adder through exclusive OR gates under the control of a clock .0.. The frequency data and envelope data are summed at the adder and the resultant of addition is supplied as an addressing signal to a sine wave ROM for reading out therefrom an envelope-controlled musical sound signal.

REFERENCES:
patent: 3740450 (1973-06-01), Deutsch
patent: 4079650 (1978-03-01), Deutsch et al.
patent: 4085644 (1978-04-01), Deutsch et al.
patent: 4227435 (1980-10-01), Ando et al.
patent: 4281574 (1981-08-01), Deutsch
patent: 4296663 (1981-10-01), Chibana

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