[opendtv] Re: Kennard and Powell to the rescue
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 13 Jan 2009 15:10:43 -0500
Bob Miller wrote:
> Early on in the mobile 8-VSB debate I understood that
> the mobile 8-VSB would be receivable by legacy receivers
> though they could not take advantage of the increased
> robustness that M/H offered.
It would be possible to design such an M/H system, but it's not the one
described in A/153. For example, it would have been possible to create
extra training sequences and duplicate, byte-interleaved data frames
(different interleaving than used in the main ATSC channel), and
transmitted all that as the extra robustness layer, for an M/H receiver.
That's not what A/153 describes.
> If we were to go back to 1999 or 2000 and suggest this
> for mobile all hell would have broke loose.
Not at all. As far back as during Reed Hundt FCC, in the 1990s, the FCC
position was that as long as one SDTV program is aired FOTA, the rest of
the 19.39 Mb/s channel could be used for other purposes. A/91 was
published in 2000, and it made it plain to everyone that the rest of the
spectrum could be used for just about anything. Data, other codecs,
encrypted content, what have you.
So what's so different about having an M/H scheme that uses H.264
compression?
Bert
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