On Sun, Aug 10, 2003 at 08:17:56PM +0300, Lauri Tischler wrote: > Good question, maybe somebody wise can also explain why the two, > T and C, are different in the first place.
>From what I've been able to glean from Google (yes, OK, I should have done this before the original posting...) it seems that DVB-T is actually more difficult to deal with than DVB-C. DVB-T uses COFDM to eliminate things like signal ghosting and provide facility for Single-Frequency Networks ideal for mobile DVB (in the same way that DAB does for digital radio). Once the core signal is extracted, there are the usual options of QAM and FEC settings. Google searching seems to suggest that because a high-quality signal is already available via a dedicated cable, DVB-C does not perform any COFDM processing, and instead starts immediately with QAM in any value from 16 right up to 256, since the signal quality should be there to deal with such intensity... So it would seem that using a DVB-T card on a DVB-C network may require bypassing the COFDM section of the signal processing. I'm guessing there may also be an issue with voltage across the input provided by the cable company that would not exist on a standard rooftop aerial... Perhaps I've answered my own question, but I'd still be interested to hear more informed opinion! Cheers, Gavin. -- Info: To unsubscribe send a mail to [EMAIL PROTECTED] with "unsubscribe linux-dvb" as subject.
