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A New Active Matrix Decoder for Surround Sound

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The decoder employs control signals derived from the signal outputs rather than the inputs, that is, using feedback analogous to an output-controlled limiter. This leads to tighter tolerances, excellent crosstalk figures and improved dynamics. It gives good performance on matrix-encoded sources but also very pleasing results on un-encoded two-channel material. The paper discusses the principles and their benefits.

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AES - Audio Engineering Society