Dual encoded switching matrix

Details Dual encoded switching matrix Dual encoded switching matrix

1979-10-10

1982-04-20

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

200 5A, 340365S, 34082579, G06F 302

Patent

active

043261949

ABSTRACT:
An input switch arrangement which minimizes the number of connections needed between an array of switch members and the circuit used to detect and encode switch closure. Each switch member has four sides adapted to be connected together. The first and second sides of all switch members within a column of the array are connected to a unique pair of a plurality of column connection terminals and the third and fourth sides of all switch members within a row of the array are connected to unique pair of a plurality of row connection terminals.

REFERENCES:
patent: 3284773 (1966-11-01), Saykay
patent: 3761945 (1973-09-01), Engle
patent: 3778815 (1973-12-01), Wright
patent: 3886335 (1975-05-01), Hendricks
patent: 3979744 (1976-09-01), Schroder
patent: 4074261 (1978-02-01), Van Der Gaag
patent: 4078257 (1978-03-01), Bagley
patent: 4148017 (1979-04-01), Tomisawa
patent: 4157539 (1979-06-01), Hunts et al.

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