[opendtv] Re: Trial FOTA HDTV in France
- From: Olivier Houot <olho_avatar_i@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 11 Jun 2006 22:53:43 +0200
> Another thing is that there appear to be, for now, two program streams
> over
> one multiplex, in Paris, Lyon, et Marseille. In Paris, UHF Ch 23.
> Which must
> mean that they had to go to 64-QAM, vs 16-QAM they use for SDTV. Which
> is
> most likely why you're reading about reception issues at longer
> distances.
> Low power, 64-QAM, no SFN. Makes it difficult. Even with H.264, 1920 X
> 1080
> at 50i must require a good 10+ Mb/s.
For SDTV in TNT, TF1 is also in a 64 QAM multiplex. From my position 34
km away from a 32 Kw transmitter, i see no difference between 16 QAM and
64 QAM channels, and i am not hearing to much complaints about 64 QAM.
So i think its really a problem tied to the low transmission power.
Possibly a prerequisite for getting the official go ahead for the
experiment.
The bitrates mentionned are indeed in the vicinity of 10-12 Mbps.
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