Patent ID: 7092535
Filing Date: 2006-08-15
Classification: H04R

Abstract:
1. A loudspeaker comprising: a sensor for the determination of the radiation resistance of a diaphragm, the radiation resistance expressed by the velocity/acceleration of the loudspeaker diaphragm and the sound pressure in a distance from the diaphragm, and thereby, via a signal processing unit, provide a control signal to a filter unit adjusting the performance of the loudspeaker in an adaptive manner to the acoustical characteristics of the listening room, said sensor comprising a microphone for detecting the sound pressure in at least two points differently spaced from the diaphragm; a carrier means enabling the microphone to be effectively and successively exposed to the sound pressure in each of the at least two points; and in which the microphone is mounted in a stationary position and is acoustically connected with a sound guide tube having a free end located spaced from the diaphragm, said tubes being telescopically or otherwise adjustably arranged so as to enable its free end to be shiftable between positions differently spaced from the diaphragm.