Fill note generator for electronic organ

G - Physics – 10 – H

Patent

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Details

84/1.5

G10H 7/00 (2006.01) G10H 1/38 (2006.01)

Patent

CA 1148776

ABSTRACT OF THE DISCLOSURE A fill note generator for use in electronic musical instruments such as electronic organs which include a keyboard having a solo portion customarily played by the right hand and an accompaniment portion customarily played by the left hand. A multiplexer scans the keys of the solo portion of the keyboard and generates a time division multiplexed solo data stream. The keys of the accompaniment portion of the keyboard are interconnected so as to form twelve sets corresponding to the twelve pitches of the chromatic scale wherein the keys in each set are connected to a common output. A multistage shift register has its load inputs connected to the outputs of the interconnected sets of accompaniment keys and produces on its output a fill note multiplexed data stream comprising keydown signals in time slots corresponding to the keydown signals loaded into its inputs from the outputs of the sets of accompaniment keys. The inputs are recirculated in the shift register so that the pattern repeats itself once each octave of the scan of the solo portion of the keyboard. A window circuit gates to an output the data stream on the output of the shift register for a predetermined number of time slots following the occurrence of the first occurring keydown signal in the solo data stream.

373503

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