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:
Jan. 31, 2012
Filed:
Aug. 04, 2008
Medford Alan Dyer, San Diego, CA (US);
Christopher Todd Welsh, Fishers, IN (US);
Jeffrey Phillip Mcateer, Carmel, IN (US);
Alan Dean Michel, Fishers, IN (US);
John Charles Baumhauer, Jr., Indianapolis, IN (US);
Medford Alan Dyer, San Diego, CA (US);
Christopher Todd Welsh, Fishers, IN (US);
Jeffrey Phillip McAteer, Carmel, IN (US);
Alan Dean Michel, Fishers, IN (US);
John Charles Baumhauer, Jr., Indianapolis, IN (US);
MWM Mobile Products, LLC, Indianapolis, IN (US);
Abstract
An omnidirectional electret condenser microphone element with improved low frequency background ambient acoustical noise rejection is provided. The omnidirectional electret condenser microphone element includes a plurality of passageways in acoustic series that couple at least one acoustic aperture of the microphone element to an acoustic cavity formed within the microphone element. At least one of said plurality of passageways is of a predefined size that is determined to provide the desired response roll-off within a predefined frequency range. In at least one preferred configuration, the roll-off resulting from the plurality of passageways is greater than 2.0 dB between 300 and 100 Hz. In at least one alternate preferred configuration, the roll-off resulting from the plurality of passageways is greater than 3.0 dB between 300 and 100 Hz.