Keyboard crosspoint encoder having N-key rollover

Details Keyboard crosspoint encoder having N-key rollover Keyboard crosspoint encoder having N-key rollover

1981-02-12

1983-12-13

Crosland, Donnie Lee

Communications: electrical

Audible indication

Percussion-type sound producer

340365S, 340365R, G08C 2500

Patent

active

044207441

ABSTRACT:
A keyboard crosspoint encoder and a method of operating it which provide N-key rollover. The encoder has an information storage device. The matrix of crosspoint switches is scanned to determine the status of each switch and this information is stored in an array in the storage device. This array is checked to determine if a phantom switch condition exists. The encoder then provides an output of all newly-closed switches which are not involved in a phantom switch condition.

REFERENCES:
patent: 3920926 (1975-11-01), Lenaerts et al.
patent: 4106011 (1978-08-01), Melanson et al.
patent: 4231016 (1980-10-01), Ueda

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