Abstract: A method of modifying low frequency components of a digital audio signal having left and right channel signals, including the steps of: a) filtering the left and right channels signals using respective left and right high-pass filters to form left and right high-pass filtered signals; b) filtering the left and right channel signals using respective left and right band-pass filters to form left and right low frequency signals; c) modifying the amplitude of the left and right low frequency signals to give modified left and right low frequency signals whereby signals with amplitude a where 0<a<a1 are amplified by a first constant value C1, signals with amplitude a1?a<a2 are amplified proportional to 1/a, signals with amplitude a=2a are unchanged, signals with amplitude a2<a<a3 are attenuated proportional to 1/a, and signals with amplitude a=a3 are attenuated by a second constant value C2; and d) combining the modified band-pass filtered left and right signals with the respective left and right hig

Abstract: A method of modifying low frequency components of a digital audio signal having left and right channel signals, including the steps of: a) filtering the left and right channels signals using respective left and right high-pass filters to form left and right high-pass filtered signals; b) filtering the left and right channel signals using respective left and right band-pass filters to form left and right low frequency signals; c) modifying the amplitude of the left and right low frequency signals to give modified left and right low frequency signals whereby signals with amplitude a where 0<a<a1 are amplified by a first constant value C1, signals with amplitude a1≦a<a2 are amplified proportional to 1/a, signals with amplitude a=2a are unchanged, signals with amplitude a2<a<a3 are attenuated proportional to 1/a, and signals with amplitude a=a3 are attenuated by a second constant value C2; and d) combining the modified band-pass filtered left and right signals with the respective l

Abstract: A method of audio signal processing for a loudspeaker located close to an ear in use, the method consisting of or including:- creating one or more derived signals from an original monophonic input signal, the derived signals being representative of the original signal being scattered by one or more bodies remote from said ear (excluding room boundary reflection or reverberation), combining the derived signal or signals with said input signal to form a combined signal, and feeding the combined signal to said loudspeaker, thereby providing cues for enabling the listener to perceive the source of the sound of the original monophonic input signal to be located remote from said ear.