[opendtv] Re: Multi-band TV receiver and DVB-H
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 26 May 2004 13:09:58 -0400
John Shutt wrote:
> You seem to imply that DVB-H is only broadcast separately
> from DTT. It can
> be, but it is also designed to be included as part of a normal DVB-T
> transmission, and that is where the power of DVB-H comes in.
I suppose so, but it wouldn't make a whole lot of sense. If
you want to dedicate 10 to 15 Mb/s to the DVB-H stream, you would be
reducing the DVB-T stream size to the point of irrelevance.
But even more fun is the concept of layering DVB-H-like extra
robustness features over ATSC. This is just as feasible, of
course, although it would be reinventing the wheel. And for
mobility, at least until dynamic echo tolerance with 8-VSB or
perhaps 2-VSB has been demonstrated more convincingly, multi-
carrier schemes are perhaps more appropriate. Still, it's
easy to see a much more robust stream being multiplexed along
with regular old ATSC also. Depending on the robust bandwidth
you're looking for, this might also make next to zero sense.
BTW, that $9.95 Xceiver device I mentioned is a tuner, not the
complete receiver. I said "receiver," but meant tuner. Cool, though,
because it's not so hard to see the rest of the receiver solution
as a common world-wide design (using MPEG-2 TS and other stuff
layered on top).
Bert
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