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On Thu, 2008-05-22 at 14:45 +0100, Mike Perkins wrote:
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Carl L. Gilbert wrote:
>
> What is the difference between an HDTV card and a digital SDTV? If they
> are both simply dumping MPEG streams, then I don't see the difference.
> And I am at a loss as to why there is a special section about HDTV cards
> and why all digital tuner cards don't claim HDTV?
>
Digital != High Definition. Digital is just a different transmission technique
compared to analog. SD = Standard Definition, HD = High Definition. Analog can
only (for practical purposes) carry SD. Digital can carry both SD and HD.
Although there are similar 'streams' within the Digital transmission which carry
SD and HD, HD may be encoded differently than SD. HD has much larger amounts of
data and requires much more processor power and uses much more storage (so
faster data busses may be required).
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Right, thats why I compared an HD card to a "digital" SD card. IN this case both cards are digital. And what I have read indicates digital streams are not processes but stored as is. So I don't see what special an HD card is doing that a digital SD card isin't? Both streams go to the drive unprocessed. Is it that the HD is more dififcult to pull out of the transport stream than the SD digital signals? Just trying to get what makes an HD digital capture card different from an SD digital capture card. They don't even need to do encoding right!?<BR>
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CL<BR>
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