[opendtv] Re: 20060912 Twang's Tuesday Tribune (Mark's Monday Memo)
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 15 Sep 2006 16:38:54 -0400
Richard Hollandsworth wrote:
> Who makes Diversity Antenna Processor for 8VSB???
> Although they are very plentiful for DVB-T, I have yet
> to run across one for 8VSB, other than in some lab resuts
> from CRC and Korea researchers. Must be a much easier
> signal processing job for COFDM....
Until I got to your last sentence, I didn't understand whether you were
trying to make a point.
On what basis would you support the last sentence? I disagree
completely. My point was only to speculate that diversity antennas
should improve 8-VSB far more than they improve COFDM, when there are
narrow but very deep nulls in the 6 MHz spectrum.
The reason is simple. If the null is narrow enough, the C part of COFDM
will permit that null to be ignored even without diversity antennas.
Whereas 8-VSB could become undecypherable.
As to why no one makes such boxes that you can buy on a shelf, the
reason is exactly the same as why we still have to buy 3rd gen ATSC
STBs. It's because people here prefer to be suckered into TV
subscription schemes and/or retailers here prefer to steer people in
that direction automatically.
Bert
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