G - Physics – 10 – H
Patent
G - Physics
10
H
84/1.2
G10H 1/00 (2006.01) G10H 1/38 (2006.01) G10H 3/06 (2006.01)
Patent
CA 1068521
ABSTRACT A harmony generator provides signals for causing the output system of an electronic musical instrument to simultaneously sound a plurality of tones forming a chord, such tones correspond- ing to keys depressed on the left-hand or accompaniment keyboard of the instrument. The tones sounded by operation of the harmony generator are related in pitch to a key depressed by the operator on the right-hand or solo keyboard of the instrument, to harmonize therewith. The harmony generator incorporates a matrix which is connected with switches individually actuated by operation of the keys of the two keyboards, and with decoders for identifying par- ticular notes and octaves thereof, whereby the matrix produces a train of pulses representative of a plurality of individual keys, which is received by a logic unit and employed to store, in a plurality of latch units, representations of certain operated ones of the keys of the accompaniment keyboard, and certain data relating to the operated key of the solo keyboard which corresponds to the highest pitch. The latches develop output signals which are effective to select certain ones of a plurality of output signals of a tone signal generator and to selectively reduce them in frequency by an amount corresponding to the data stored in the latches, and then to cause each signal there produced to be connected through an individual voicing circuit prior to being connected with the out- put system of the instrument. The individual voicing of the tones sounded by the output system simulate an orchestration in which the various parts of a multi-part harmony are played by several separate instruments.
211840
Hall George R.
Hall Robert J.
Moore Douglas R.
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