Touch terminal with reliable pad selection

Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...

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Details

340712, 340365C, G06F 314, G09F 932

Patent

active

043743811

ABSTRACT:
A touch terminal identifies a single user-selectable, touch-responsive pad element on the display screen for user communication with a data processing system. The terminal makes the identification in response to the durations of pulse signals which vary according to the touch-selection condition of the pad elements. A multiple-step technique of repetitively measuring the signal durations relative to reference values attains essentially error-free pad selection. The operation includes the updating of the reference values of the pulse-signal durations.

REFERENCES:
patent: 3696409 (1972-10-01), Braaten
patent: 3772684 (1973-11-01), Scantlin
patent: 3973256 (1976-08-01), Stoesser et al.
patent: 4145748 (1979-03-01), Eichelberger et al.
patent: 4157539 (1979-06-01), Hunts et al.

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