Digital envelope generator

Details Digital envelope generator Digital envelope generator

1980-03-26

1982-08-17

Truhe, J. V.

Music

Instruments

84 113, 364722, G10H 102, G06F 102

Patent

active

043443478

ABSTRACT:
A digital envelope generator implemented in the form of an off-the-shelve microcomputer is disclosed. Five envelopes are produced simultaneously in multiplexed form and are output via a digital-to-analog converter and multiplexer to corresponding voltage controlled amplifiers/filters. The outputs are scaled in amplitude in accordance with touch response signals derived from a keyboard and the envelope time constants are scaled in accordance with the pitch of the notes selected by the keyboard. The outputs are available without further modification for controlling the Q of the filters, or the gain of amplifiers, and are simultaneously available with the amplitude scaled in accordance with the pitch of selected notes for controlling the frequency response of the voltage controlled filters.

REFERENCES:
patent: 3948139 (1976-04-01), Melcher et al.
patent: 4067253 (1978-01-01), Wheelwright et al.
patent: 4079650 (1978-03-01), Deutsch et al.
patent: 4083286 (1978-04-01), Faulkner
patent: 4099439 (1978-07-01), Luce
patent: 4145946 (1979-03-01), Deutsch
patent: 4178826 (1979-12-01), Hiyoshi et al.
patent: 4185531 (1980-01-01), Oberheim et al.
patent: 4185532 (1980-01-01), Hiyoshi et al.
patent: 4201109 (1980-05-01), Kitagawa
patent: 4226155 (1980-10-01), Ferdinand

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