This paper reviews signal processing methods for improving the presentation of two-channel and multi-channel recordings by spatial processing in consideration of the playback system. The approaches discussed include: artificial reverberation; virtualization of recordings for playback over headphones or two loudspeakers; "upmix" or "stereo widening" of two-channel recordings for playback over multi-channel or two-channel loudspeaker systems. The goal is to enhance the listener`s experience by attempting to match the audio signal to the playback system, while reproducing the intended audio image as faithfully as possible. Recently developed frequency-domain algorithms for ambience enhancement and directional enhancement are reviewed, and their possible benefits are discussed.
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