Abstract: A method and device for enhancing low frequency content of an input signal (X), e.g. bass boosting of an audio signal. An overdriving (ODR) of a low frequency signal part (LS1) of the input signal (X) is performed to produce a boosted low frequency signal (LS3), wherein the overdriving (ODR) includes amplifying the low frequency signal part (LS1) by a first gain (G1) to form an amplified low frequency signal (LS2), and hard-clipping (CLP) the amplified low frequency signal (LS2) to form the boosted low frequency signal (LS3). A first low-pass filtering (LPF1) is then performed, resulting in a processed low frequency signal (LS4). A cut-off frequency of the first low-pass filtering (LPF1) is selected so as to reduce distortion components introduced by the overdriving (ODR). Finally, the processed low frequency signal (LS4) is combined with at least part of the input signal (X) to form an output signal (Y).

Abstract: An audio processor for generating an audio output signal (Y) with an enhanced spectral component compared to an audio input signal (X). The processor comprises a frequency splitter (FS) for splitting the input (X) into first and second parts (X1, X2) representing different frequency bands. A gain calculator (GC) estimates a level (LY) of the enhanced audio output signal (Y) for a case where the first signal part (X1) is gained by a previous enhancement gain value (LG). A dynamic headroom (HR) available is calculated based on the estimated level (LY). An enhancement gain (G) is then calculated based on the available dynamic headroom (HR), and this enhancement gain G is applied to the first signal part (X1), and finally the enhanced output signal (Y) is generate by combining the enhanced signal part (ESP) and the second signal part (X2). Preferably, the enhancement gain G calculation is updated for each signal sample, thus allowing fast adjustments of the gain G to avoid clipping distortion.

Abstract: A method and device for enhancing low frequency content of an input signal (X), e.g. bass boosting of an audio signal. An overdriving (ODR) of a low frequency signal part (LS1) of the input signal (X) is performed to produce a boosted low frequency signal (LS3), wherein the overdriving (ODR) includes amplifying the low frequency signal part (LS1) by a first gain (G1) to form an amplified low frequency signal (LS2), and hard-clipping (CLP) the amplified low frequency signal (LS2) to form the boosted low frequency signal (LS3). A first low-pass filtering (LPF1) is then performed, resulting in a processed low frequency signal (LS4). A cut-off frequency of the first low-pass filtering (LPF1) is selected so as to reduce distortion components introduced by the overdriving (ODR). Finally, the processed low frequency signal (LS4) is combined with at least part of the input signal (X) to form an output signal (Y).