Re: incompatible change to Freeview is coming
- From: Bob Miller <bob@xxxxxxxxxx>
- Date: Sun, 29 Apr 2007 16:12:26 GMT
"Mark Crispin" <mrc@xxxxxxxxxxxxxxxxxx> wrote in message news:alpine.LRH.0.99.0704282108100.25797@xxxxxxxxxxxxxxxxxxxxxxxxxxxxExcept that with ATSC no one will try it. Too many problems. Again if you want to try MIMO it is far better to do it with a COFDM based modulation.It seems that the British has realized that building a DTV system without HDTV was a mistake, so they're creating a mechanism called MIMO (multiple-input multiple-output) to get the bandwidth necessary to do HDTV. Everybody in the UK with a DTV receiver will have to buy a new receiver which receives the new dual-transmission, plus a second rooftop antenna since half of the signal comes from a different transmitter.
-- Mark --
Science does not emerge from voting, party politics, or public debate.
Si vis pacem, para bellum.
It's just a bit of R&D that the BBC published, it doesn't mean that it will ever get implemented, nor that it couldn't be developed to be backwardly compatible with current receivers and antenna to at least ensure that current services are retained.
The idea is simply to broadcast two seperate DVB-T services on the same frequency from the same mast at the same ERP but in opposite polarisation - there is also surely no particular reason why (if it actually works) it couldn't be adopted for ATSC as well...
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