Circuit for recognizing key inputs

Details Circuit for recognizing key inputs Circuit for recognizing key inputs

1993-02-10

1994-12-06

Groody, James J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 25, G06F 302

Patent

active

053714989

ABSTRACT:
A circuit for recognizing double key inputs includes a key input part, a key signal generating part, a comparing circuit and a detecting part, the key signal generating part operates simultaneously with the key input of the key input part and generates a key signal which is provided to the comparing circuit which outputs a high level only at the time of two or more key inputs. A high level output of the comparing circuit is added to an output voltage of the key input part when two or more keys are pressed. The circuit provides the advantage that double key inputs can be easily recognized with a minimum number of key input lines.

REFERENCES:
patent: 4231016 (1980-10-01), Ueda
patent: 4293849 (1981-10-01), Lacy
patent: 5153572 (1992-10-01), Caldwell et al.

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