Abstract: A system is disclosed where the well-known psycho-acoustic masking effect, i.e. frequency and/or temporal masking is applied to reduce the human perception of a noise signal. An input signal, such as music or another entertainment signal, is adjusted based on the intensity of the auditory noise by applying existing knowledge about the properties of the human auditory perception and is provided to the human user as a masking sound signal, so that the masking sound elevates the human auditory perception threshold for at least some of the noise signal, whereby the user's perception of that part of the noise signal is reduced or eliminated. The masking sound may be combined with active noise control where a sound in anti-phase with the noise signal is provided for further reduction of the human perception of the noise signal.