Keyboard encoding circuit utilizing an A/D converter

Details Keyboard encoding circuit utilizing an A/D converter Keyboard encoding circuit utilizing an A/D converter

1975-12-04

1977-03-29

Caldwell, John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340365R, 340347AD, G06F 302

Patent

active

040152545

ABSTRACT:
Various switches of a keyboard are connected with a voltage divider network to establish an analog voltage for respective switch closures. The analog voltage is stored on a capacitor and converted by an analog-to-digital converter for input to a computer.

REFERENCES:
patent: 2132213 (1938-10-01), Locke
patent: 3248696 (1966-04-01), Bloch
patent: 3530310 (1970-09-01), Adelson
patent: 3653038 (1972-03-01), Webb et al.
patent: 3836909 (1974-09-01), Cockerell
patent: 3928789 (1975-12-01), Elias

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