What's the easiest/cheapest way to take a Dolby/DTS input and output that to a stereo pair? Is this a simple Blackfin device or some CODEC device capable of performing this function?
Yes, It should be possible to perform Dolby digital decoding in Blackfin processors.Below is the link to the software modules which has implementation of Dolby decoder available.
Analog Devices does not have a stand-alone Dolby/DTS decoder IC, so something like a Blackfin will probably be your best bet. I am going to move this conversation to the Blackfin community. Someone there should be able to give you an answer.
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