[opendtv] Re: 20040722 Thundering Thursday Thanks (Mark's Monday Memo)
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 22 Jul 2004 15:50:29 -0400
Eory Frank wrote:
> >I'd like to point this out once again: Had we had the "out" of being
> >able to lower the bit rate to achieve these results, it is unlikely
> >that you would have seen 3.3 b/s/Hz in this indoor environment.
>
> And I'd like to point out that the "out" you describe was
> just announced by the ATSC a couple days ago:
>
> http://www.atsc.org/news_information/press/2004/PR_EVSB.htm
>
> As an HDTV owner and enthusiast, I sincerely hope that not a
> single kilobit of E-VSB data will ever be transmitted by any
> DTV broadcaster! E-VSB is a really brutal trade of primary
> stream data rate, just to improve C/N threshold on a secondary stream.
Your couldn't have echoed my thoughts any better, Frank.
I never believed E-VSB was worth pursuing, and fortunately, pragmatic
companies like Lynx (ex-Zenith engineers) and LG/Zenith didn't think
so either. They didn't rely on E-VSB, but rather on being more
innovative with what they had already.
There are even better ways of achieving lower C/N ratios for
secondary streams than the meat cleaver approach of fussing with the
modulation of symbols. We went through that some time ago.
E-VSB was an afterthought for ATSC, and hopefully, it will remain
in the sidelines. The best aspect of that E-VSB effort, in my opinion,
was the realization by the ATSC that indoor reception for DTV was a
requirement, not just some catch as catch can capability that the
majority of DTT users would never be able to benefit from.
Bert
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