[opendtv] Re: Global standard

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 30 Apr 2012 15:53:07 -0500

Mike Tsinberg wrote:

> Can we fit two or more 1080i signals into that channel?


The answer to that question is, "You can hope to fit two 1080i streams over a 
single 6 MHz channel a lot better if you DO NOT insist on the unnecessary IP 
overhead!"

What's nice about DVB-T2 is that it gets true spectral efficiency that's at 
least as good as 8T-VSB. Meaning, you can actually achieve better b/s/Hz at the 
same C/N margin requirement, as 8T-VSB. This is because they have gone to the 
low density parity check scheme.

Combine that with H.265 compression, and you have a good scheme for OTA 
broadcast.

BUT:

The question then is, do we really think this broadcast model has a future, or 
do we think that everyone wants to use VOD anyway, and that therefore 
optimizing for broadcast, optimizing for two 1080i streams per 6 MHz channel, 
and optimizing for few transmit towers, no longer makes any sense?

That's the issue. Perhaps your questions aren't the right ones to ask? Perhaps 
Mark Aitken's approach is more likely for the future, which means (IMO) that 
you accept lower spectral efficiency AND a very questionable role for most of 
the local broadcasters in the future?

Bert

 
 
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