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:
Apr. 21, 2009
Filed:
Nov. 24, 2004
Erich Klein, Himberg, AT;
Erich Klein, Himberg, AT;
NXP B.V., Eindhoven, NL;
Abstract
In the case of an electro-acoustic apparatus () having a housing () with a housing wall () and having an electro-acoustic transducer () that is arranged facing the housing wall (), a front chamber volume () that forms an acoustic spring is provided between the transducer () and the housing wall (), and in the housing wall () a sound outlet aperture () that preferably forms an acoustic mass is provided, wherein between the front chamber volume () and the sound outlet aperture () a sound guide channel () is provided, which forms a sufficiently large acoustic mass in order jointly with the front chamber volume () to achieve a satisfactory band-pass characteristic of the sound pressure frequency response of the transducer ().