Digital tone and chord generators

Details Digital tone and chord generators Digital tone and chord generators

1977-11-07

1980-02-19

Miska, Vit W.

Music

Instruments

84 103, 84DIG22, G10H 100, G10H 500

Patent

active

041888480

ABSTRACT:
An electronic organ includes a read-only memory which stores eight bit binary words each having a digital value proportional to the frequency of a different note. When a chord keyswitch is actuated, a corresponding chord selector controlled by a multiplexer circuit causes the randomly addressable memory to sequentially generate binary words corresponding to the frequencies of the notes forming the selected chord. Each binary word is stored in a latch associated with a different universal tone generator capable of generating any tone as controlled by the stored binary word. Each universal tone generator includes a comparator which recognizes a match between the associated latch and a counter which receives clock pulses from a single fixed frequency oscillator. The comparator resets the counter and generates an output pulse which is divided to form an audible tone signal.

REFERENCES:
patent: 3544693 (1970-12-01), Tripp
patent: 3605026 (1971-09-01), Bowden
patent: 3610801 (1971-10-01), Fredrin
patent: 3696201 (1972-10-01), Arsem et al.
patent: 3878750 (1975-04-01), Kapps
patent: 3889568 (1975-06-01), Amata
patent: 3929051 (1975-12-01), Moore
patent: 4041825 (1977-08-01), Pascetta

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