Single bus keyboard

Details Single bus keyboard Single bus keyboard

1976-10-19

1979-01-30

Schaefer, Robert K.

Music

Instruments

84DIG8, G10H 100

Patent

active

041365950

ABSTRACT:
An inexpensive single bus keyboard circuit for voltage controlled electronic musical instruments. The keyboard signal voltage is sampled and stored after each depression of a key, or release of a key when other keys are held in a depressed state, and a gate detector is provided to prevent sampling and change of stored voltage when all keys are released, to thereby insure that the last stored signal voltage is retained when all keys are released. A program counter establishes the timing relationships between the generated control signals and provides adaptive timing to prevent response to spurious key switch signals. The circuit distinguishes in a simple manner between keyboard sample voltages corresponding to the depression of one or more keys and those corresponding to the condition in which no keys are depressed.

REFERENCES:
patent: 3511917 (1970-05-01), Mallett
patent: 3627895 (1971-12-01), Savon
patent: 3733955 (1973-05-01), Reinagel et al.
patent: 3828110 (1974-08-01), Colin
patent: 3872764 (1975-08-01), Munch, Jr. et al.
patent: 3930429 (1976-01-01), Hill
patent: 4012980 (1977-03-01), Suzuki

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