[opendtv] Re: DVB Standard
- From: "John Shutt" <shuttj@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 27 Oct 2005 09:54:26 -0400
The only thing I would add is that DVB-T is much more flexible and offers
each broadcaster the ability to choose her/his own tradeoffs between signal
robustness and data payload for their own circumstances, market, and needs.
On the side of every DVB-T transmitter is a big knob that says 3.7 Mbps on
one end and 23.7 Mbps on the other (all for 6 MHz US channels.) You can
decide where the knob goes for your market, or even for which day part. The
lower the payload, the more receivable the signal. At settings below 17
Mbps reception blows away even the finest "cold fusion" LG 5th generation
prototype ATSC receiver, as demonstrated by it's ease of reception in mobile
applications.
DVB-T also allows a broadcaster to transmit to both fixed and
mobile/portable receivers via hierarchical modulation (HM), DVB-H, or both.
ATSC has attempted to include an HM mode of operation with the recent
adoption of E-VSB, but as is the case for ATSC Cable and ATSC Satellite, it
has remained a paper standard only, without any hardware support or
broadcaster interest.
ATSC is forever stuck at a single tradeoff, and relies on the kindness of
strangers (receiver manufacturers) to provide the improvements in
robustness.
John Shutt
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