[opendtv] Re: 20040722 Thundering Thursday Thanks (Mark's Monday Memo)

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Fri, 23 Jul 2004 13:59:27 -0400

Bob Miller [mailto:bob@xxxxxxxxxx] wrote:

> If you follow my past post as to our intentions, anything that locks
> broadcasters into 8-VSB is a good thing as to a mobile venture. And a
> working 8-VSB opens up other possibilities one of which is a
> quicker end to the transition.

I agree. Also, I don't know what LG has done, but we do know that the
similarly breakthrough Lynx receiver still left room for improvement,
within the context of the existing 8-VSB standard (i.e. not making
use of further enhancements available with E-VSB). Two examples
that we've discussed in the past would be use of the training sequence,
instead of relying only on blind equalization, which would reduce
the C/N ratio required for symbol sync and also increase tolerance to
dynamic echo. And more clever combination of the RS and trellis FEC,
which would increase the number of bytes correctable, and thereby
further lower the C/N ratio necessary for decoding. Not to mention
further equalizer enhancements, of course.

> The most amazing thing was the obvious superiority of the simple loop
> and rectangular antennas.

Indeed. I suspect two problems. First, I wonder if the active antennas
introduce some extra phase distortion, or other type of distortion,
that was imperceptible with analog TV? Second, the more directional
indoor antennas probably do work better at pulling in weak stations,
but obviously not without being re-aimed. If you're looking for an
antenna that mustn't be touched between stations, the less directional
the better.

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