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:
Feb. 10, 2015
Filed:
Aug. 21, 2007
Rune Skramstad, Drammen, NO;
Rune Skramstad, Drammen, NO;
Other;
Abstract
A horn loudspeaker, in particular for reproducing bass sound in public address systems, in which the horn () is mounted directly to the driver element () without any intervening compression chamber. The back side of the driver element () is covered by a back chamber () designed with walls of a semi-permeable material. The walls may be perforated or made of a 'leaky' material such as cell foam with open structure, or a fibrous material. The 'leaky' back chamber will prevent the build up of high pressures in the back chamber at large cone excursions. The horn loudspeaker is suitable for stacking in groups of two or more, so as to produce a sound source scalable for reproducing any frequency range heard by humans in public address systems or hi-fi systems. Due to the back chamber design, the horn loudspeaker, for high frequencies especially in conical horn shaped versions, can be stacked close together. Thus, a sound source including a number of such closely stacked loudspeakers can provide a homogeneous sound field covering a wide area even at high audio frequencies.