Patent ID: 6456718
Filing Date: 2002-09-24
Classification: H03G

Abstract:
An audio system comprising loudspeakers, and a circuit for processing an audio signal, whereby the circuit comprises:an input for receiving the audio signal and an output for supplying an output signal; a low-pass filter coupled to the input having a cut-off frequency at a known frequency for passing a portion of said audio signal having a frequency below said known frequency; a harmonics generator coupled to an output of the low-pass filter for generating harmonics of the low-pass filtered audio signal; and adding means coupled to the input as well as to the harmonics generator for supplying a sum of the audio signal and the generated harmonics to the output, characterized in that the harmonics generator comprises:a full-wave rectifier for rectifying the audio signal; an integrator for integrating the rectified audio signal, said integrator generating the harmonics; and means for limiting an amplitude of the generated harmonics.