Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1993-01-04
1994-12-06
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
333213, 333215, G10K 1116
Patent
active
053718011
ABSTRACT:
Apparatus for absorbing acoustic energy directed toward a wall. The appars includes a piezoelectric layer intermediate the wall and the source of the acoustic energy. Circuitry attached to the output of the transducer compensates blocked and motional capacitances of the transducer so that the output signal generates real current for dissipation in a resistor thereby to minimize any echo reflected from the piezoelectric layer.
REFERENCES:
patent: 3602844 (1971-08-01), Sykes
patent: 4158787 (1979-06-01), Forward
patent: 4383230 (1983-05-01), Manzolini
patent: 4485356 (1984-11-01), Fassino
Gilardi Stephen S.
Moffett Mark B.
Powers James M.
Isen Forester W.
Lall Prithvi C.
McGowan Michael J.
Olgo Michael F.
The United States of America as represented by the Secretary of
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