Input signal recognition circuit

Details Input signal recognition circuit Input signal recognition circuit

1978-11-27

1980-10-28

Yusko, Donald J.

Communications: electrical

Digital comparator systems

340365E, 178 17C, 178 18, H04Q 900, G08C 900

Patent

active

042310164

ABSTRACT:
An input signal recognition circuit for a control system having an array of momentary switching elements (hereinafter referred to as "keys") whose number is larger than that of the array input terminals, which prevents erroneous control system operation which may occur upon simultaneous actuation of a plurality of keys. The control system with the input signal recognition circuit stably operates against key chattering and noise. The input signal recognition circuit comprises a keyboard including a plurality of keys arranged in a matrix, signals for sequentially sensing the actuation of keys on the respective columns of the matrix, an input buffer section which responds to the sensing signals to store the key data keyed in through the key actuation, a memory section for temporarily storing the key data and a recognition section for checking the contents of the memory section to detect whether any key has been actuated and for recognizing whether a plurality of keys in different columns of the matrix have been actuated. Only when a single key is actuated, or a plurality of keys in the same column are actuated, does the circuit identify that the input data is effective and generate a given control command signal in the control system.

REFERENCES:
patent: 3683371 (1972-08-01), Holz
patent: 3792466 (1974-02-01), Arnold et al.
patent: 3973256 (1976-08-01), Stoesser et al.
patent: 4020467 (1977-04-01), Hashimoto et al.
patent: 4106011 (1978-08-01), Melanson et al.

Affiliated with

Also associated with

Rating

Input signal recognition circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Input signal recognition circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Input signal recognition circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-270594