Method and apparatus for differentiating simultaneous and sequen

Details Method and apparatus for differentiating simultaneous and sequen Method and apparatus for differentiating simultaneous and sequen

1992-12-04

1995-06-13

Groody, James J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 26, H03M 1100

Patent

active

054247306

ABSTRACT:
A method differentiates simultaneous and sequential key strokes by detecting simultaneous key strokes if two keys are pushed within a judging time T.sub.L. The method includes the steps of (a) measuring a first time T.sub.1 from a time when a first key is pushed to a time when a second key is pushed, and a second time T.sub.2 from the time when the second key is pushed to a time when one of the first and second keys is released, (b) comparing the first and second times T.sub.1 and T.sub.2 with an arbitrary threshold function T.sub.C which is set within the judging time T.sub.L, and (c) differentiating whether key strokes of the first and second keys are simultaneous or sequential based on a comparison result of the step (b).

REFERENCES:
patent: 4498073 (1985-02-01), Fishen et al.
patent: 4918444 (1990-04-01), Matsubayashi
patent: 4929944 (1990-05-01), Nakajima

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