Integrated circuit for generating keying envelope signals

Details Integrated circuit for generating keying envelope signals Integrated circuit for generating keying envelope signals

G - Physics

10

H

84/1.1

G10H 1/00 (2006.01) G10H 1/057 (2006.01) G10H 1/08 (2006.01)

Patent

CA 1178833

INTEGRATED CIRCUIT FOR GENERATING KEYING ENVELOPE SIGNAL Abstract of the Disclosure A multiplexed electronic organ utilizing a plurality of integrated circuit chips, each chip time division multiplexing selected keying envelope time constant signals from a switched capacitor time con- stant generator for two alphabetic notes over the entire frequency range of a spinet or for one alpha- betic note over the entire frequency range of the manuals and pedals of a console organ. The same inte- grated circuit chip is used for both spinet or console organs. Each chip contains a multiplexer circuit which isolates the multiplexed keying envelope output signals from the time constant generator and includes as a coupling means a plurality of switching element arranged into groups. Some of the groups are interconnected to provide the keying envelope time constant signal nor- mally intended for one frequency range to the output associated with a different frequency range.

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