G - Physics – 10 – H
Patent
G - Physics
10
H
84/1.1
G10H 1/00 (2006.01)
Patent
CA 1137340
ABSTRACT A bass note generation system for an electronic organ is connected in parallel across at least some keying lines from a keyboard which are connected with an organ keyer circuit. The bass note genera- tion system provides one of several different types of bassline accom- paniment for the organist. The system is constructed as a large scale integrated (LSI) circuit. A chord pattern detector receives signals on keying lines corresponding to keys depressed by the instrument player and attempts to recognize a normalized chord pattern. A counter tracks the operation of the chord pattern detector and provides an output corres- ponding to the alphabetic note of any recognized chord. If the chord pattern is recognized, the output of the detector and the output of the counter address a normalized and preprogrammed bassline pattern memory. The digital value of the bass note stored in the memory and the output of the counter are serially added to transpose the normalized bass note to the appropriate musical key and applied to a decoder-keyer circuit at selected time intervals in a musical measure for providing a pre- composed musical bassline output. If the chord pattern detector fails to recognize the combination of keys depressed by the instrument player as a normalized chord pattern, the system defaults into a scanning mode of operation. In the scanning mode, the preprogrammed bassline pattern memory is disabled and the system provides a fixed bassline routine with the notes selected from among the keys actually depressed by the instru- ment player.
386349
Bione Angelo A.
Sehnert Robert J.
Taylor Horace E.
Marmon Company
Smart & Biggar
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