Key input apparatus

Details Key input apparatus Key input apparatus

1988-06-16

1990-05-29

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 25, H04B 1500

Patent

active

049299441

ABSTRACT:
An input key apparatus comprises a keyboard including a plurality of keys and generating key signals when keys are pressed and a key input decoder receiving the key signals from the keyboard for generating decoded key signals. The key input decoder also generates a single key depression signal when a key of the keyboard is pressed one time, and a multi-key depression signal when two or more keys of the keyboard are simultaneously pressed. A chattering prevention circuit receives the single key depression signal and the multi-key depression signal for determining on the basis of the received signals whether or not the key signal received by the decoder is valid, for the purpose of generating a key input valid signal. An output circuit receives the decoded key signals for latching the decoded key signal in response to the key input valid signal.

REFERENCES:
patent: 3753007 (1973-08-01), Viswanathan
patent: 4375036 (1983-02-01), Miller et al.
patent: 4392065 (1983-07-01), Stiglich
patent: 4479065 (1984-10-01), Aizawa

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