Key input circuit capable of roll-over operation

Details Key input circuit capable of roll-over operation Key input circuit capable of roll-over operation

1977-01-13

1980-04-22

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340365S, G08C 2500, G06F 302

Patent

active

041997506

ABSTRACT:
In a key input circuit, the key input signal is serialized and applied directly and through a circulating register working with a certain delay time to one gate for transmitting the direct key input signal and to another gate for transmitting the output of the register utilizing the other signal as an inhibitation signal. The output of the one gate is supplied to an output means which allows the passage at a predetermined time later and the output of the another gate is used to erase the corresponding contents of the register at a predetermined time later. This erasing is inhibited for a predetermined time period to allow a new key input signal.

REFERENCES:
patent: 3660826 (1972-05-01), Lins
patent: 3764997 (1973-10-01), Hatano et al.
patent: 3883867 (1975-05-01), Hatano et al.
patent: 3928847 (1975-12-01), Spence
patent: 3949365 (1976-04-01), Kashio
patent: 3950743 (1976-04-01), Hatano et al.
patent: 3969592 (1976-07-01), Pipitone et al.

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