[opendtv] Re: News: The Winds of Spectrum War
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 30 Oct 2009 10:42:00 -0400
Craig Birkmaier wrote:
> We are not talking about the ATSC mobile standard. We are talking
> about a new DTV standard to replace ATSC and free up spectrum for
> broadband.
>
> By the way, you could get AT LEAST five 480P channels into 19.3 Mbps,
> even live sports, with h.264. Three to four Mbps per stream is more
> than adequate
>
> Regards
> Craig
Yes, 3 mbps data is probably enough. My comments were based upon the
ATSC mobile payload after using 1/4 FEC (3/4 redundant). Then 3 mbps
actual data would probably take 12-13 mbps of the stream if that was
allowed. Mobile needs extra overhead for error correction but I don't
know which standard you are talking about so I can't say how much.
The 1/4 FEC seemed excessive overhead in mobile ATSC but even that
standard allowed also for 1/2 FEC and I don't know yet which is getting
used in practice, if any. Wasn't some station using it by now? I
stopped following that as my life has been eventful in other ways recently.
- Tom
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