The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2003
Filed:
Jan. 24, 2001
Applicant:
Inventors:
Peter Faulhaber, München, DE;
Reinhard Pongratz, Taufkirchen, DE;
Assignee:
EADS Deutschland GmbH, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G10K 1/116 ;
U.S. Cl.
CPC ...
G10K 1/116 ;
Abstract
An acoustic absorber ( ) comprises a housing or wall ( ), defining an interior absorber chamber ( ) connected by openings ( ) to a duct ( ) to reduce the sound in the duct ( ). The natural frequency and impedance of the absorber ( ) are variable, so that the absorber ( ) can be adapted to a sound field in the duct ( ) in a manner corresponding to the respective operating conditions. Such adaptation is achieved mechanically, for example, by an elastic membrane ( ) for varying the volume of chamber ( ), or thermally, for example, by a heating wire ( ) or a wire braid ( ).