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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