Patent ID: 6104817
Filing Date: 2000-08-15
Classification: H04R

Abstract:
A sound reproduction system comprising an amplifier system, a speaker, and first and second negative feedback means;the speaker having a diaphragm, a first voice coil mechanically coupled with the diaphragm, and notional measurement means coupled with the diaphragm, the notional measurement means having an output;the amplifier system comprising an amplifier with an input and an output, the amplifier output electrically coupled to the first voice coil;the first feedback means comprising first circuitry coupling the notional measurement means output with the amplifier input, said feedback means exhibiting a characteristic, the reciprocal of said characteristic being a low-pass filter; andthe second feedback means comprising a current measurement means electrically coupled with the first voice coil and having an output, and a high-pass filter coupling the current measurement means output with the amplifier input.