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Originally Posted by
tux99 
we are talking about capturing and handling a data stream which is multiple Gigabits per second (remember this is a full uncompressed HD video stream, plus the audio), this would require a lot of processing power.
The processing power required for capturing is not particularly heavy; indeed, its negligible all things considered. Storage capacity and STR performance, on the other hand, is quite high (as has been noted).
Processing power becomes an issue after the fact -- i.e. how you are going to manipulate that ginormous file you've written to disk from the uncompressed bitstream you've "captured".
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An analog signal is quite different from a digital signal
of course; you have to do ADC on the former, and voila, you're left with the same format as the later.
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a digital signal requires a chip that is explicitly made to deal with it. I'm not saying that a chip capable of handling a raw digital signal can't be made or doesn't exist
While I'm not up on the varying capabilities of most of the available existing decoder chips, it is by no means a stretch in technology for anyone to include a "raw digital input" interface (in addition to a dedicated TS interface) -- "
all you would need to do" (famous last words) is include a FIFO pool with enough capacity and DMA channel to put it out on the system bus ... such a feature has likely been lacking on decider chipsets simply because of the prior deficiencies in storage and processing technologies that made the application (uncompressed capturing) unpractical.
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the chip used in the HD-PVR is unlikely to be also able to deal with a digital signal.
no. it's capable:
http://www.analog.com/en/analog-to-d...s/product.html