A-format to B-format
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The A-format signals are converted to the B-format signals by
matrixing:
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W' = FLU+FRD+BLD+BRU
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X' = FLU+FRD-BLD-BRU
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Y' = FLU-FRD+BLD-BRU
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Z' = FLU-FRD-BLD+BRU
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and then applying proper filtering: