ADSR envelope generator

Details ADSR envelope generator ADSR envelope generator

1976-01-26

1978-03-21

Jackmon, E. S.

Music

Instruments

84 101, 84 103, 84 113, 84 117, 84 124, G01H 102

Patent

active

040796507

ABSTRACT:
A single amplitude curve generator is time shared amongst a plurality of musical tone generators for controlling their musical shapes. The curve generator creates a wide variety of envelope characteristics by implementing a recursive computation algorithm for selected choices of a single curve shape parameter coupled with the use of a collection of timing clocks used to vary the time intervals associated with the attack, decay, and release regions of the musical tone envelope. Provision is made for forcing the release of a tone generator when a limited number of tone generators have been completely assigned in a keyboard musical instrument and a new note key switch is actuated. Note release signals can be ignored until the amplitude curve generator has completed the attack and decay regions for a given tone generator.

REFERENCES:
patent: 3610799 (1971-10-01), Watson
patent: 3610805 (1971-10-01), Watson et al.
patent: 3952623 (1976-04-01), Deutsch

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