[opendtv] Re: News: DTV Boxes Could Cost $1 Billion

  • From: Eory Frank-p22212 <Frank.Eory@xxxxxxxxxxxxx>
  • To: "'opendtv@xxxxxxxxxxxxx'" <opendtv@xxxxxxxxxxxxx>
  • Date: Tue, 27 Jul 2004 11:45:43 -0700

>From: "John Shutt" <shuttj@xxxxxxxxx> 
>To: <opendtv@xxxxxxxxxxxxx> 
>Date: Tue, 27 Jul 2004 12:28:42 -0400 

>Only after the questionable testing of ATSC and DVB-T by the MSTV did
>broadcasters come up with a list of "criteria" that included portable and

Actually, the "broadcasters' requirements" came before the MSTV tests.

>and that was addressed with the ATSC's recently adopted E-VSB

Really? As far as I can tell, the only thing addressed by E-VSB is the ability 
to implement hierarchical modulation with a lower C/N threshold for the high 
priority stream. E-VSB does not address the broadcasters' requirements for 
portable or mobile reception. It does not address the multipath issue, and by 
inference, it therefore does not address the broadcasters' requirement for 
indoor reception with simple antennas. It simply lowers the noise threshold for 
a (hopefully small) chunk of the DTV multiplex.

If E-VSB were used for SD multicasting, this could help some of my hypothetical 
football viewers who just missed 8-VSB reception by 1 or 2 dB, but at the cost 
of degraded HD picture quality for everyone else. And even in the 100% E-VSB 
mode -- completely incompatible with existing receivers -- there will still be 
some viewers inside the Grade B countour who will "just miss" E-VSB reception 
by a few dB on portable receivers. Nevermind mobile receivers -- they require 
something altogether different (and as JW likes to point out, a business model 
would be nice too).

-- Frank
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