Interactive CRT with touch level set

Details Interactive CRT with touch level set Interactive CRT with touch level set

1987-04-13

1987-12-01

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340365P, 178 18, G09G 100

Patent

active

047107596

ABSTRACT:
A touch panel level set for a CRT including a plurality of energy paths crisscrossing the faceplate of the CRT includes a microprocessor for energizing and interrogating the energy paths on a regular basis. A specific threshold level for each energy path is regularly determined by the microprocessor and retained in its memory. The specific threshold levels are used to compare the determined threshold levels in each energy path during interrogation thereof to ascertain whether the energy paths have been interrupted. Comparison is done on an analog basis with the memory output of the microprocessor being supplied through a D/A converter.

REFERENCES:
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patent: 4199758 (1980-04-01), Wilhelm et al.
patent: 4305071 (1981-12-01), Bell et al.
patent: 4374381 (1983-02-01), Ng et al.
patent: 4527156 (1985-07-01), Nawrocki et al.
patent: 4591710 (1986-05-01), Komadina et al.
patent: 4672364 (1987-06-01), Lucas
IBM Tech. Disc. Bul., vol. 25, No. 8, Jan., 1983, "Dynamically Adjustable Capacitive Key Sensing Method", J. G. Irwin, Jr.

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