Because the vast majority of musical recordings are preserved in two-channel stereo format, special upconverters are required in order to use advanced spatial reproduction formats, such as wave-field synthesis. This paper evaluates the subjective quality of synthesized acoustic scenes when using virtual sources that were extracted as separate tracks from stereo mixes. Although wave-field synthesis has its own artifacts, the degradation produced by using separated sources includes timbre modification, burbling sounds, musical noise, and intersource residuals. However, masking effects make these artifacts less perceptible when the entire scene is being reproduced.
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https://aes2.org/publications/elibrary-page/?id=14808
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