Keyboard entry system

Details Keyboard entry system Keyboard entry system

G - Physics

06

F

354/236.51

G06F 3/023 (2006.01) B41J 5/10 (2006.01) H03M 11/00 (2006.01)

Patent

CA 1290860

KEYBOARD ENTRY SYSTEM ABSTRACT A keyboard entry system is disclosed which com- prises a keyboard which includes a plurality of letter keys, one for each letter of a selected language. The entry system responds to conventional sequential acti- vation of individual keys by providing output signals indicative of the respective individual letters asso- ciated with the activated keys to an application program such as a word processor or printer control program. the keyboard entry system also responds to chords of simultaneously activated multiple keys by using these chords to retrieve stored words from a dictionary. It is the stored words rather than the entered chords which are applied as inputs to the application program. This system allows an operator to use both conventional se- quential key entry techniques and chorded entry tech- niques for rapid data entry. Chords are detected by comparing a stored constant with the elapsed time between a key release and the immediately preceding key depression of an overlapping key. The overlapping keys are characterized as a chord when the elapsed time is greater than the stored constant. A biofeedback mechan- ism alerts the operator of inadvertent chords.

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