Key input means providing common key identifying and display dri

Details Key input means providing common key identifying and display dri Key input means providing common key identifying and display dri

1974-11-29

1977-09-27

Caldwell, John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340365R, G06F 302

Patent

active

040514714

ABSTRACT:
A keying input apparatus is provided which includes; a bit pattern generator responsive to a clock signal for generating different bit patterns of four bits, in a bit sequence and a decoding matrix for converting the different bit patterns at every fourth bit, into individual digit timing signals. A plurality of key switches are connected at one end thereof with corresponding ones of the digit timing signals and connected to a common terminal at the other ends thereof, to drive a gate responsive to the common connected output of said key switches for allowing a coded signal representative of a particular depressed key to be withdrawn from the bit pattern generator and transfer it to a circulation register for storing the coded signal. Depression of a given key thus enables the gate at a corresponding digit timing to load a coded signal corresponding to that digit timing in the register, so that the coded signal as stored in the register uniquely identifies the depressed key.

REFERENCES:
patent: 3590158 (1971-06-01), Pabst
patent: 3594781 (1971-07-01), Gerjets
patent: 3675239 (1972-07-01), Ackerman et al.
patent: 3715746 (1973-02-01), Hatano
patent: 3717871 (1973-02-01), Hatano et al.
patent: 3778815 (1973-12-01), Wright
patent: 3818441 (1974-06-01), Nomiya et al.
patent: 3834616 (1974-09-01), Washizuka et al.
patent: 3883867 (1975-05-01), Hatano et al.
patent: 3950743 (1976-04-01), Hatano et al.

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