Scan-controlled keyboard

Details Scan-controlled keyboard Scan-controlled keyboard

1980-02-15

1981-07-07

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

340365R, G06F 302

Patent

active

042777801

ABSTRACT:
A keyboard having a matrix arrangement of analog keyswitches arranged along column conductors leading from a driver chip and row conductors leading to a detector chip. The driver chip has a strobe line and multiple address lines adapted to connect to a controller. The column conductors are sequentially pulsed by the driver chip. The detector chip has a strobe line common to that of the driver chip and a multiple line data bus for directing keyboard signals simultaneously from the several row columns.

REFERENCES:
patent: 3928847 (1975-12-01), Spence
patent: 3978474 (1976-08-01), Engstrom
patent: 4106011 (1978-08-01), Melanson et al.
patent: 4163222 (1979-07-01), Gove
patent: 4170768 (1979-10-01), Kitagawa

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