Acoustic coupling free electric drum
First Claim
1. In combination a drum having a drum head and a variable resistance electromechanical transducer substantially contiguous with said head and comprising first and second conductive members is surface contact with and spaced by a carbon impregnated resilient, dielectric, synthetic organic polymer matrix defining a drum head hit pressure responsive, variable resistance medium between said members in acoustic coupling free relation.
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Accused Products
Abstract
Faithful replication of a drummer'"'"'s hits on an electric drum, free of cogeneration of spurious signals by acoustic coupling of the drum pick-up with extraneous energy sources such as nearby musical instruments is achieved by employing as the drum hit pick-up a variable resistance transducer comprising a foamed dielectric matrix, e.g. polymer, having electroconductive particles therein, sandwiched between conductive members one of which is contiguous with the drum head.
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Citations
33 Claims
- 1. In combination a drum having a drum head and a variable resistance electromechanical transducer substantially contiguous with said head and comprising first and second conductive members is surface contact with and spaced by a carbon impregnated resilient, dielectric, synthetic organic polymer matrix defining a drum head hit pressure responsive, variable resistance medium between said members in acoustic coupling free relation.
- 11. An electric drum adapted for sound generation substantially exclusively from direct hit inputs selectively in an environment of spurious acoustic energy inputs, said drum comprising a drum head extended over the open end of a drum chamber, and a variable resistance electromechanical transducer in operative contact with said drum head, said transducer comprising a first conductive member substantially contiguous with said drum head and deflectibly co-responsive to hits on said head, a second conductive member, and a variable resistance, resilient medium sandwiched between said members, said medium comprising a dielectric synthetic organic polymer matrix and electroconductive particles distributed therethrough in variable resistor defining relation, said medium being temporarily locally responsive to head direct hit inputs to the surface of said transducer in medium resistance varying relation and substantially non-responsive to concomitant acoustic energy inputs.
- 27. An electric drum, comprising in combination a drum head extended over the open end of a drum chamber, said drum head being substantially contiguous with an electromechanical transducer comprising a synthetic organic polymer open cell foam body, said body being impregnated with carbon and defining an electrical resistance variable in response to drum head hits in acoustic coupling free relation.
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33. An electric drum comprising a generally cylindrical drum body having an open end and an externally threaded portion below said open end, a tensioning member circumscribing said drum body in relatively axially adjustable threaded engaged relation, said tensioning member including an inturned flange;
- a synthetic organic polymeric drum head disposed upon the drum body open end, said drum head having perimetrical means for engaging said tensioning member flange in tautness determining relation upon thread controlled axial adjustment of the drum body and tensioning member;
a generally flat, circular electromechanical transducer comprising a first circular conductive member comprising metal screening contiguous with the inward side of said drum head, a second circular conductive member coaxial with and spaced from said first conductive member, said second member comprising a metal foil supported on a backing, and sandwiched between said first and second conductive members a disc shaped dielectric matrix comprising urethane polymer foam impregnated with carbon in variable resistance defining relation responsive to direct pressure, said transducer being supported within the drum body in direct drum head hit receiving relation for generation of a signal responsive to direct hit reception and in acoustic coupling free relation.
- a synthetic organic polymeric drum head disposed upon the drum body open end, said drum head having perimetrical means for engaging said tensioning member flange in tautness determining relation upon thread controlled axial adjustment of the drum body and tensioning member;
Specification