Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1983-02-10
1986-06-17
Groody, James J.
Communications: electrical
Audible indication
Percussion-type sound producer
200DIG1, 307116, 340365S, G06F 302
Patent
active
045959137
ABSTRACT:
A touch sensitive system comprising a clock (30) for generating a clocking signal supplied to a plurality of circuits each including one of the touch plates (12, 14, 15, 16, 17) for generating a varying capacitance value depending upon whether or not the plate is touched or untouched. The change in capacitance of each circuit varies the time duration of the generated output signal of that circuit. A flipflop (18, 19, 20, 21, 22) for each circuit receives a reference signal from a reference circuit (61) and the output signal from the associated circuit and supplies to an associated output terminal (24, 25, 26, 27, 28) a digital signal indicating which plate or plates are touched.
REFERENCES:
patent: 3659285 (1972-04-01), Baer
patent: 3931610 (1976-01-01), Marin
patent: 3993154 (1976-11-01), Simmons
patent: 4055735 (1977-10-01), Eachus
patent: 4056699 (1977-11-01), Jordan
patent: 4103252 (1978-07-01), Bobick
patent: 4177421 (1979-12-01), Thornburg
patent: 4305007 (1981-12-01), Hughes
patent: 4305135 (1981-12-01), Dahl
patent: 4363029 (1982-12-01), Piliavin
patent: 4494110 (1985-01-01), Wakeling
IBM Technical Disclosure Bulletin, Williams, vol. 17, No. 1, Jun. 1974, pp. 166-167.
Groody James J.
Moore Gerald L.
Pie Associates
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