Sustained repeat control digital polyphonic synthesizer

Details Sustained repeat control digital polyphonic synthesizer Sustained repeat control digital polyphonic synthesizer

1976-08-09

1979-03-27

Weldon, Ulysses

Music

Instruments

84 112, 84 113, 84 121, 84 127, 84 124, G10H 104

Patent

active

041459466

ABSTRACT:
A sustained repeat control in a digital polyphonic synthesizer for gradually decreasing the amplitude of one or more notes generated repetitively in response to operation of a single key. The sustained repeat control includes a digital register storing a plurality of control words in digitally coded form, there being one control word assigned to each note being generated at any one time. Each word includes bits coded to indicate the current relative amplitude of the associated note. When a key is depressd, the control word or words for the note or notes assigned to that key have bits initialized to a predetermined value. When the key is released the amplitude values represented by the bits are counted down periodically. The bits in turn control the amplitude of the repetitively generated notes, a zero detector terminating the operation when the bits are decremented to zero.

REFERENCES:
patent: 3610799 (1971-10-01), Watson
patent: 3610805 (1971-10-01), Watson et al.
patent: 3610806 (1971-10-01), Deutsch
patent: 3821458 (1974-06-01), Schreier
patent: 3910150 (1975-10-01), Deutsch et al.
patent: 3952623 (1976-04-01), Deutsch

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