Keyboard encoder using priority encoders

Details Keyboard encoder using priority encoders Keyboard encoder using priority encoders

1979-05-23

1981-10-06

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

340365E, G06F 302

Patent

active

042938490

ABSTRACT:
An electrical circuit is provided for converting the output from a keyboard into a binary form. At least two priority encoders are interfaced to the keyboard. Each priority encoder generates a binary code when a particular key is depressed. The individual binary outputs from the priority encoders are combined to provide a binary output which is representative of the particular key which has been depressed. In this manner, the output of the keyboard is encoded to binary form. The keyboard encoding system is disabled when a plurality of switches are simultaneously closed to thereby prevent errors caused by multiple switch closures.

REFERENCES:
patent: 3493928 (1970-02-01), Juliusburger
patent: 3551616 (1970-12-01), Juliusburger et al.
patent: 3611358 (1971-10-01), Dalmasso
patent: 3623082 (1971-11-01), Stein et al.
patent: 3781874 (1973-12-01), Jennings
patent: 3928789 (1975-12-01), Elias
patent: 3949365 (1976-04-01), Kashio
patent: 3978474 (1976-08-01), Engstrom
patent: 4072820 (1978-02-01), Gunther
patent: 4101871 (1978-07-01), Oliveira
patent: 4138917 (1979-02-01), Sakashita et al.
Control Engineering, Feb. 1977, pp. 41, 42.

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