Keyboard entry circuitry of the key strobing type

Details Keyboard entry circuitry of the key strobing type Keyboard entry circuitry of the key strobing type

1976-08-06

1978-07-04

Habecker, Thomas B.

Communications: electrical

Audible indication

Percussion-type sound producer

340365S, G08C 2500

Patent

active

040991776

ABSTRACT:
A keyboard entry circuitry for calculator purposes is of the key strobing type wherein one each end of respective key of a keyboard is operatively coupled with corresponding digit time signal or key strobing signal while the other ends of the respective keys are connected in common with each other, whereby the identity of a specific actuated key is provided by determining which one of the key strobing signals is developed via that actuated key. Two kinds of digit time signals are placed within a one-word time sequence, one having different timing phases for the respective keys for key strobing purposes set foth above and the other having the same timing phase for all the keys for shortening a period of time required for key determinations. Once there is a equivalency with respect to both the key strobing digit time signals and the common digit time signal, the indication of any actuated key is provided.

REFERENCES:
patent: 3623082 (1971-11-01), Stein
patent: 3777222 (1973-12-01), Harris
patent: 3818441 (1974-06-01), Nomiya
patent: 3900845 (1975-08-01), Tsuiki

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