Just intonation electronic keyboard instrument

Details Just intonation electronic keyboard instrument Just intonation electronic keyboard instrument

1983-02-14

1985-02-12

Witkowski, Stanley J.

Music

Instruments

84451, 84478, 84DIG8, 84DIG11, G09B 1502, G10H 118

Patent

active

044983638

ABSTRACT:
A just intonation electronic keyboard instrument comprises a plurality of tonality selection switches for selecting each key from among twenty-four just intonation keys, a control circuit for determining one or a plurality of just intonation keys according to the manipulation of said switches, a variable frequency oscillator having its output oscillation frequency varied in accordance with the selected key, and a frequency dividing circuit having frequency dividers which are varied of their frequency dividing ratios according to the selected key. The number of tonality selection switches is less than twenty-four. The control circuit discriminates the selection to a major scale or a minor scale, and discriminates one or a plurality of keys from each of twelve keys from C through B, and determines one or a plurality of selected just intonation keys, according to the manipulation of said intonation selection switches. The variable frequency oscillator produces an output oscillation frequency which is an integral multiple of a frequency of a key-note of the determined key. The frequency dividing ratios of the frequency dividers are respectively varies so that ratios among frequency dividing ratios are in accordance with a temperament of the determined just intonation key.

REFERENCES:
patent: 3986422 (1976-10-01), Coles
patent: 4009633 (1977-01-01), Coles
patent: 4152964 (1979-05-01), Waage
patent: 4248119 (1981-02-01), Yamada
patent: 4332182 (1982-06-01), Franz et al.
patent: 4419916 (1983-12-01), Aoki
patent: 4422365 (1983-12-01), Iwaki

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