US 4,227,432 AGranted

Electronic musical instrument having multiplexed keying

AssigneeMarmon Company

InventorBrian M. Bagus

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Abstract

An electronic musical instrument having tone signal sources and keyers for the tone signal sources has a time division multiplexer for multiplexing the key-down information in groups such as for the upper manual, lower manual and pedals. The keyers are provided in divider keyer packages with drawbar, or harmonic content, information being synchronously multiplexed with the key-down information to a single set of keyers.

Claims10

Dependent claims

An electronic musical instrument comprising:

a plurality of key down selection sources, each having a group of key down output lines and each providing key down selection signals on respective ones of said group of key down output lines;
first multiplexer means having a plurality of first multiplier output lines for time division multiplexing different ones of said key down selection signals from selected ones of said groups of key down output lines into a plurality of time intervals on each of said plurality of first multiplexer output lines;
a plurality of analog harmonic signal sources, each having a group of harmonic output lines and each providing harmonic value signals on respective ones of said group of harmonic output lines;
second multiplexer means having a plurality of second multiplexer output lines for time division multiplexing different ones of said harmonic value signals from selected ones of said groups of harmonic output lines into a plurality of time intervals on each of said plurality of second multiplexer output lines;
a top octave signal source having a plurality of top octave output lines and providing various frequency range signals on each of said top octave output lines;
a plurality of keyer means each having a keyer output line and each being coupled to said first multiplexer means for receiving a different one of said time division multiplexed key down signals, to said second multiplexer means for receiving said time division multiplexed harmonic value signals and to said top octave signal source for receiving selected ones of said various frequency range signals;
each of said plurality of keyer means providing on said keyer output line a time divisioned multiplexed signal related to said selected various frequency range signals received by said keyer;
demultiplexer means having a plurality of demultiplexer output lines and being coupled to said plurality of keyer means for receiving said time division multiplexed signals related to said selected various frequency range signals received by each said keyer and providing on said plurality of demultiplexer output lines a plurality of demultiplexed output signals;
and
output circuit means coupled to said demultiplexer means for receiving said plurality of demultiplexed output signals and producing a plurality of audio frequency range signals.

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Dependencies are inferred from the claim text.

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Abstract

An electronic musical instrument comprising:

a plurality of key down selection sources, each having a group of key down output lines and each providing key down selection signals on respective ones of said group of key down output lines;
first multiplexer means having a plurality of first multiplier output lines for time division multiplexing different ones of said key down selection signals from selected ones of said groups of key down output lines into a plurality of time intervals on each of said plurality of first multiplexer output lines;
a plurality of analog harmonic signal sources, each having a group of harmonic output lines and each providing harmonic value signals on respective ones of said group of harmonic output lines;
second multiplexer means having a plurality of second multiplexer output lines for time division multiplexing different ones of said harmonic value signals from selected ones of said groups of harmonic output lines into a plurality of time intervals on each of said plurality of second multiplexer output lines;
a top octave signal source having a plurality of top octave output lines and providing various frequency range signals on each of said top octave output lines;
a plurality of keyer means each having a keyer output line and each being coupled to said first multiplexer means for receiving a different one of said time division multiplexed key down signals, to said second multiplexer means for receiving said time division multiplexed harmonic value signals and to said top octave signal source for receiving selected ones of said various frequency range signals;
each of said plurality of keyer means providing on said keyer output line a time divisioned multiplexed signal related to said selected various frequency range signals received by said keyer;
demultiplexer means having a plurality of demultiplexer output lines and being coupled to said plurality of keyer means for receiving said time division multiplexed signals related to said selected various frequency range signals received by each said keyer and providing on said plurality of demultiplexer output lines a plurality of demultiplexed output signals;
and
output circuit means coupled to said demultiplexer means for receiving said plurality of demultiplexed output signals and producing a plurality of audio frequency range signals.

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