Note frequency generator for a polyphonic tone synthesizer

Details Note frequency generator for a polyphonic tone synthesizer Note frequency generator for a polyphonic tone synthesizer

1977-01-10

1978-09-19

Witkowski, Stanley J.

Music

Instruments

84 127, G10H 102, G10H 502

Patent

active

041144961

ABSTRACT:
A frequency generator for a keyboard operated electronic music instrument using a single master clock source for selectively producing all the notes of the musical scale. A set of frequency numbers corresponding to each of the notes of a diatonic scale are stored in a memory. A frequency number is selected from the stored numbers according to the note to be generated when a key on a keyboard is activated, the selected number being applied to an adder-accumulator periodically at the master clock rate for incrementing the contents of the accumulator. Overflow pulses from the adder-accumulator shift amplitude values sequentially from a set of values stored in a shift register through an adder to a digital-to-analog converter. The adder modifies the amplitude values by applying a fractional part of the incremental difference between each value and the next value in the sequence to the adder. The fractional amount is determined by the content of the adder-accumulator and changes with each master clock pulse.

REFERENCES:
patent: 3610799 (1971-10-01), Watson
patent: 3743755 (1973-07-01), Watson
patent: 3821714 (1974-06-01), Tomisawa et al.
patent: 3823390 (1974-07-01), Tomisawa et al.
patent: 3882751 (1975-05-01), Tomisawa et al.
patent: 3903775 (1975-09-01), Kondo et al.
patent: 3908504 (1975-09-01), Deutsch
patent: 4000675 (1977-01-01), Futamese et al.
patent: 4026179 (1977-05-01), Futamese

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