Patent ID: 8582784

Claim:
A method of enhancing low frequency content of an input signal, comprising: a) performing a first low-pass filtering of the input signal to provide a low frequency signal part, and combining a portion of the input signal with the low frequency signal part prior to performing an overdriving of a low frequency signal part of the input signal to form a boosted low frequency signal in order to take into account possible high frequency peaks, leading to a lower boost of the low frequency signal, thereby reducing the risk of clipping distortion in the output signal, wherein the overdriving comprises amplifying the low frequency signal part of the input signal by a first gain to form an amplified low frequency signal, and hard-clipping the amplified low frequency signal to form the boosted low frequency signal, b) performing a second low-pass filtering of the boosted low frequency signal to form a processed low frequency signal, wherein a first cut-off frequency of the second low-pass filtering is selected to reduce distortion components introduced by the overdriving, and c) combining the processed low frequency signal with at least part of the input signal to form an output signal.