Matrix switching apparatus for preventing pseudo input

Details Matrix switching apparatus for preventing pseudo input Matrix switching apparatus for preventing pseudo input

1986-12-29

1989-04-11

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

341 24, G06F 302, H04Q 100, G08C 2500

Patent

active

048210331

ABSTRACT:
A matrix switching apparatus for preventing a pseudo input condition caused by a detour of a signal as well as output of an erroneous signal caused by a noise intruding into an apparatus and the like, in which a plurality of key lines having a plurality of switches are arranged in the first and second directions respectively. The apparatus includes a detector for detecting an ON condition of the plurality of the switches by a time-sharing detection, a counter for counting up a number of the switches which are in the ON condition simultaneously, both totally and respectively with the key lines, a storage means for storing a first, second, third and fourth statuses which represent the condition of the switches respectively, and a controller for inverting the second status into the first status.

REFERENCES:
patent: 4106011 (1978-08-01), Melanson et al.
patent: 4420744 (1983-12-01), Jesson
patent: 4502039 (1985-02-01), Vercesi et al.
patent: 4581603 (1986-04-01), Ingold et al.
patent: 4599608 (1986-07-01), Matsuoka
patent: 4617554 (1986-10-01), Krause et al.
patent: 4661957 (1987-04-01), Okuhara

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