Acoustics – Sound-modifying means – By wave interference
Patent
1992-06-08
1993-08-03
Gellner, Michael L.
Acoustics
Sound-modifying means
By wave interference
381 71, F01N 106
Patent
active
052331377
ABSTRACT:
A transducer arrangement for active noise cancellation signals provides an acoustically permeable membrane between ports in direct communication with the noise propagating conduit and the transducers delivering sound pulses to the port. A housing defines at least one chamber exposed to at least one face of a transducer diaphragm, and each chamber is connected in fluid communication with the conduit through at least one port. The chamber is partitioned by the membrane to include chamber portions with a predetermined volumetric relationship. In a preferred embodiment where the transducer arrangement is coupled to a motor vehicle exhaust conduit, the membrane is preferably a silicone impregnated polyurethane film reinforced with aromatic polyamide fibers. Such a member provides a waterproof, acoustically permeable partition between the port and any adjacent speaker face that can withstand high temperatures. In a two transducer arrangement, two diaphragm faces are exposed to a common chamber including two membranes positioned on opposite sides of the port communicating with the chamber.
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AES Bandpass Loudspeaker Enclosures, Publication Nov., 1986, 2383.
Dang K.
Ford Motor Company
Gellner Michael L.
May Roger L.
Mollon Mark L.
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