Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2007-09-25
2007-09-25
Donovan, Lincoln (Department: 2837)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C181S237000, C181S254000, C181S255000, C060S324000
Reexamination Certificate
active
10520420
ABSTRACT:
A device for active noise reduction has a chamber, which is arranged laterally in relation to a gas flow, and a chamber opening constructed in one wall of the chamber. In the area of the chamber opening, a deflection device is adjustably arranged. The deflection device, in a first position, at least partially directs the gas flow running by the chamber opening into the chamber, in order to compress air there, and, in a second position, directs the gas from the chamber to the gas flow, in order to release the gas inside the chamber. The resulting alternating pressure inside the chamber is radiated through the chamber opening as sound and overlays the disturbing sound.
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Colon Santana Eduardo
Crowell & Moring LLP
Donovan Lincoln
EADS Deutschland GmbH
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