Music – Instruments
Patent
1981-06-22
1983-06-07
Truhe, J. V.
Music
Instruments
84DIG4, 84 124, G10H 100
Patent
active
043865461
ABSTRACT:
An electronic keyboard musical instrument comprising a multiplexed keyboard and a programmable microcomputer interfaced between the keyboard and a system of capture tone generators, and including means for causing phase locking between the tone generators. The loading circuitry for the microcomputer monitors the serial data stream and transmits only key change information to the microcomputer. The microcomputer controls the assignment and the assignment of tone generators for the accompaniment, solo and pedal manuals based on the key change information transmitted to it. In order to avoid cancellation between tones which are in octave or multiples thereof apart, the tone generators for each manual are phase locked with the other tone generators for that manual. Not only are the top octave synthesizers for each tone generator phase locked, but the divider strings are uniformly loaded so that they operate in identical states. The microcomputer phase locks one tone generator to another in accordance with a sequence dictated by its programming, and phase locking is accomplished regardless of whether the tones are initiated simultaneously or not.
REFERENCES:
patent: 4121489 (1978-10-01), Adachi et al.
patent: 4186637 (1980-02-01), Swain et al.
patent: 4215616 (1980-08-01), Gross
Fritz Gary R.
Howell Stephen L.
Robinson John W.
Isen Forester W.
Kimball International Inc.
Truhe J. V.
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