Re: incompatible change to Freeview is coming

mattk wrote:
"Mark Crispin" <mrc@xxxxxxxxxxxxxxxxxx> wrote in message news:alpine.LRH.0.99.0704282108100.25797@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
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.

http://crave.cnet.co.uk/televisions/0,39029474,49289930,00.htm

-- Mark --

http://staff.washington.edu/mrc
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...


Except 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.

Bob Miller
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Relevant Pages

  • Re: incompatible change to Freeview is coming
    ... HDTV was a mistake, so they're creating a mechanism called MIMO ... Everybody in the UK with a DTV receiver will have to buy a new ... The idea is simply to broadcast two seperate DVB-T services on the same ...
    (alt.tv.tech.hdtv)
  • Re: incompatible change to Freeview is coming
    ... HDTV was a mistake, so they're creating a mechanism called MIMO ... Everybody in the UK with a DTV receiver will have to buy a new ... reflections - as from satellite signals. ...
    (alt.tv.tech.hdtv)
  • UK: incompatible change to Freeview is coming
    ... 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. ...
    (alt.tv.tech.hdtv)
  • Re: UK: incompatible change to Freeview is coming
    ... 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 ... Everybody in the UK with a DTV receiver will have to buy a new ...
    (alt.tv.tech.hdtv)