Keyboard encoding arrangement

Details Keyboard encoding arrangement Keyboard encoding arrangement

1979-06-13

1981-08-04

Bookbinder, Marc E.

Communications: electrical

Audible indication

Percussion-type sound producer

455158, 455175, 455185, H04B 116, G06F 302

Patent

active

042825164

ABSTRACT:
In a television receiver, a keyboard encoding arrangement which makes use of an existing register for storing binary signals representing control information and existing connections coupled to respective stages of the register includes transmission gates for selectively coupling the connections to respective switches of a keyboard. The switches of the keyboard are also coupled to sense circuits for detecting the presence or absence of binary signals. A counter selectively counts in response to sense signals generated by the sense circuits and generates count-representative signals which control the selective coupling and decoupling of binary signals stored in the register to the sense circuits through operated switches of the keyboard. A decoder is responsive to the count signals to generate control signals related to operated switches.

REFERENCES:
patent: 4114103 (1978-09-01), Pflasterer
Data Sheet for MM54C922/MM74C922 Key Encoder and MM54C923/MM74c923 Key Encoder--National Semiconductor 1977 MOS/LSI Databook, pp. 10-16 to 10-20.
AN-139 Application Note for Keyboard Encoder Circuits--National Semiconductor 1977 MOS/LSI Databook, pp. 10-27 to 10-30.

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