[opendtv] Re: Patent application on 8-VSB equalizer
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 9 Jul 2006 13:53:21 -0400
Initializing the equalizer from DFS info is finally starting to be
considered by LG, I find, as indicated in the published patent application
listed below. Fimoff has been looking at how to compensate for edge effects
because the PN511 sequence is not repeated. Pity Zenith didn't look into
this twelve or fifteen years ago. Al
J. H. Cheon & H. B. Jeon Zhang, "Synchronization Signal Detection Circuit
and Method of Digital Television (DTV) Receiver", U. S. Pat. App. Ser. No.
11/ 248 861 filed 12 Oct. 2005, published 13 Apr. 2006 with Pub. No.
2006-0078072.
M. Fimoff, S. Ozen & M. D. Zoltowski, "Tap Weigh Initializer for an Adaptive
Equalizer", U. S. Pat. App. Ser. No. 10/ 142 110 filed 9 May 2002, published
3 Apr. 2003 with Pub. No. 2003-0063665.
M. Fimoff, S. M. Nerayanuru & S. Ozen, "Channel Estimator for an Adaptive
Equalizer", U. S. Pat. App. Ser. No. 10/ 142 108 filed 9 May 2002, published
13 Nov. 2003 with Pub. No. 2003-0210741.
----- Original Message -----
From: "Doug McDonald" <mcdonald@xxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Friday, July 07, 2006 1:52 PM
Subject: [opendtv] Re: Patent application on 8-VSB equalizer
> John Shutt wrote:
> > Al,
> >
> > Since the patent was issued six years ago, can I assume that no product
has
> > been made thus far using this technique? Is the theory much easier than
the
> > practice?
> >
> > I've always wondered how you can use the data segment sync bits to
estimate
> > multipath
>
> cross-correlation with the known pattern. It takes LOTS of
> signal averaging to get a respectable S/N, however. This
> works because only the sync bits and the training sequence
> is constant.
>
> Doug McDonald
>
>
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