Circuit preventing phantom input in a switch matrix

Details Circuit preventing phantom input in a switch matrix Circuit preventing phantom input in a switch matrix

1983-03-21

1986-07-08

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340365E, G08C 2500

Patent

active

045996083

ABSTRACT:
In an information processing apparatus with an input device in the form of a keyboard, a multiplicity of switches associated with input keys on the keyboard are disposed in independent submatrices. When three or more keys in each submatrix are operated simultaneously, key input detection is stopped. The number of switches which are turned on in each scanning is registered and when the number is two at the most, addresses representative of the switches which are turned on are delivered out for inputting information. Key input at high speeds can be permitted and erroneous input can be prevented.

REFERENCES:
patent: 4106011 (1978-08-01), Melanson
patent: 4136336 (1979-01-01), Abe
patent: 4231016 (1980-10-01), Ueda
patent: 4283714 (1981-08-01), Trenkler
patent: 4420744 (1983-12-01), Jesson

Affiliated with

Also associated with

Rating

Circuit preventing phantom input in a switch matrix does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit preventing phantom input in a switch matrix, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit preventing phantom input in a switch matrix will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1454230