What is being asked here is the ability to encode 6 channels of digital
audio, transmitted as three SP/DIF signals into a single 5.1 encoded audio
signal, again transmitted as a single SP/DIF signal.

I would guess that this encode process is well outside the possibilities of
even the fastest  PIC or largest SX without substantial external support.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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