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:
May. 04, 2004
Filed:
Jan. 29, 2002
Jan A. Pedersen, Holstebro, DK;
Bang & Olufsen A/S, Struer, DK;
Abstract
A method and corresponding apparatus for controlling the performance of a loudspeaker in a room includes the steps of, in a first acoustic environment, which may be regarded as a reference, determining the acceleration, velocity or displacement of the loudspeaker diaphragm and the sound pressure in front of the diaphragm, and, based on these quantities, determining the radiation resistance, radiated acoustic power or real part of the acoustic wave impedance. Thereafter, the above step is repeated in a second acoustic environment, which will normally be the actual listening room in which the loudspeaker is to be used. Based on the above measurements, the ratio between the radiation resistances, radiated power or real part of the acoustic wave impedances is determined, and the ratio, optionally after suitable further processing, is used to control a controllable correction filter inserted in the signal path of the loudspeaker, whereby the performance of the loudspeaker in the second acoustic environment can be brought substantially to match the performance of the loudspeaker in the first acoustic environment.