Music – Instruments
Patent
1981-03-20
1983-03-01
Witkowski, Stanley J.
Music
Instruments
G10H 102
Patent
active
043751784
ABSTRACT:
In an electronic musical instrument having at least one keyboard with keys corresponding to the notes of a musical scale apparatus for controlling the dynamic frequency modulation of tones reproduced from key pulses associated with active keys of the keyboard including a tonal effect control for selecting one of the desired modulation effects, vibrato, delayed vibrato or decayed vibrato, a multiplexed counter having a plurality of distinct sequential time periods for creating a delay proportional to its counting rate for generating output signals for controlling the time variant parameters of the modulation effects, a triggering means for initiating individually a count in each of the time periods of the counter in response to the generation of a key pulse, at least one count source for controlling the counting rate of the counter, a comparator for disabling the count in any of the time periods of the counter and timing alignment means for realigning the output signals of the counter with the corresponding key pulse whereby the frequency modulated tone reproduced in response to a key pulse and the output control signals of the counter corresponding to such key pulse will be for any keying sequence independent of the effect of any key actuations occurring either prior or subsequent thereto.
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Allen Organ Company
Piltch Sanford J.
Witkowski Stanley J.
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