Electronic identification assemblies of capacitive keyboards

Details Electronic identification assemblies of capacitive keyboards Electronic identification assemblies of capacitive keyboards

1986-04-29

1988-04-12

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340365C, G08C 902

Patent

active

047377682

ABSTRACT:
An electronic assembly is provided associated with a capacitive keyboard for identifying the depressed keys of this keyboard, which keys are disposed at the intersection points of a checkerboard pattern formed of m lines and n columns, comprising means for successively applying to the inputs of the m lines trains of n successive identical pulses, means for successively collecting at the outputs of the n columns the signals created by these pulses and means for detecting and identifying, among the signals collected, the echoes which exceed a predetermined threshold and which correspond to depressed keys, which means comprise a comparator for comparing the amplitude of said signals with that of a reference voltage. At all times, the comparison reference is related to the average in time of the mean of the amplitudes of the signals received at least two of the column outputs.

REFERENCES:
patent: T904008 (1972-11-01), Crouse
patent: 4405917 (1983-09-01), Chai
patent: 4405918 (1983-09-01), Wall et al.
patent: 4481587 (1984-11-01), Daniels

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