In the context of a two- to three-channel upmix, center channel derivations fall within the field of common signal extraction methods. In this paper we explore the pertinence of the performance criteria that can be obtained from a probabilistic approach to source extraction; we propose a new, non-linear method to extract a common signal from two sources that makes the implementation choice of deeper extraction with a criteria of information preservation; and we provide the results of preliminary listening tests made with real-world audio materials.
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