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. 03, 2001
Filed:
Aug. 04, 1998
Bernhard Puls, Mitterfels, DE;
Harman Audio Electronic Systems GmbH, Straubing, DE;
Abstract
According to the invention, a bass reproduction device is disclosed, with which the sound emission from the membrane (,) to the listening space (,) is carried out solely by way of a displacement volume (,) and at least one sound guidance conduit (,), whose cross section is smaller than the cross section of the membrane (,). A device of this kind has the advantage that for sound emission, only wall surfaces have to be supplied, which merely have to contain the sound guidance conduit(s) (,). The side of the membrane (,) remote from the displacement volume (,) acts on a closed damping volume (,), which can, however, be changed in its size over a great band width. A particularly favorable bass reproduction is achieved if the length of the respective sound guidance conduit (,)≦&lgr;/8 of the desired upper cross-over frequency.