Asynchronous tone generator

Details Asynchronous tone generator Asynchronous tone generator

1979-05-24

1980-08-05

Witkowski, S. J.

Music

Instruments

84 124, 84DIG4, 84DIG11, G10H 102, G10H 506

Patent

active

042156165

ABSTRACT:
In an electronic organ of the time-sharing type, a single clock source drives a number of variable divisor frequency dividers which are assigned different divisor values to produce different musical tones at different times. In order to prevent phase synchronism between two simultaneously operating dividers, and thus achieve a rolling phase relationship which is perceived as a chorus effect, divisor values are employed for the two frequency dividers which are not in a whole number relationship. If the two dividers are generating octavely related notes, the divisors used have a ratio not quite equal to the nominal 2:1 value which musical theory requires. Moreover, the exact value of the ratio varies from note to note within each octave so that the rate of phase roll is not monotonously the same for all notes. Alternatively, if the two dividers are both generating the same note, then the divisors used have a ratio which is not quite equal to the 1:1 value which musical theory requires.

REFERENCES:
patent: 3828109 (1974-08-01), Morez

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