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".
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.
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.
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