[opendtv] Re: Disney to Sell Moviebeam

U. S. patent No. 5,461,426 describes earlier work with PSK on a carrier in
quadrature with video carrier that Dr. C. B. Patel, Dr. Tianmin Liu and I
did at AML.  Dr.  Liu, who was with Broadcom a while, has returned to PROC.
Dr. Patel, a consultant, is now U.S. representative to ATSC for Samsung
Electronics Company.  Dr. Jian Yang was with Raytheon the last I heard.  The
Dr. Jian Yang at Bell Labs is a different man.

Visibility of digital modulation can be reduced by repeating frames and bit
complementing. Digital modulation can be extracted from the NTSC signal by
frame comb filtering.

Al

----- Original Message ----- 
From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Tuesday, September 27, 2005 9:20 AM
Subject: [opendtv] Re: Disney to Sell Moviebeam


> Jian Yang and I proposed putting BPSK on a quadrature video carrier a
decade
> or so ago, when we worked at Samsung's AML Lab.  Some patents issued.
>
> Al
> ----- Original Message ----- 
> From: "Richard Hollandsworth" <holl_ands@xxxxxxxxx>
> To: <opendtv@xxxxxxxxxxxxx>
> Sent: Tuesday, September 27, 2005 4:18 AM
> Subject: [opendtv] Re: Disney to Sell Moviebeam
>
>
> > The www.dotcast.com website described adding a reduced level QAM carrier
> onto the visual carrier.
> > They claim that since it is "in-quadrature" to the video signal, it
would
> result in essentially zero signal at the output of an NTSC detector.
> > Seems to work similiar to how the in-phase portion of a QPSK data signal
> will not be seen by a quadrature detector and vice versa.
> >
> > Hence it is not in the vertical blanking interval, nor is it "between"
the
> Visual and Aural carriers.
> > It's yet another signal that is added onto the Visual carrier.
> >
> > Very clever scheme.....or Kludge....in either case it's days are
numbered.
> >
> >                                 <holl_ands>
> >
> > ==============================================================
> > Doug McDonald <mcdonald@xxxxxxxxxxxx> wrote:
> > John Shutt wrote:
> > >The press release said unused portions of the television spectrum, not
> > >unused portions of the television picture. MovieBeam is/was not based
on
> > >vertical interval blanking. It was based on placing digital information
> in
> > >the spaces between the Visual and Aural carriers.
> > >
> > >www.dotcast.com
> > >
> > >
> >
> >
> > That web site implies that TV sets use some sort of synchronous (PLL?)
> > detection of the
> > video. Huh? I've never seen a TV schematic that did not use a plain
> > diode detector. Of course,
> > I stopped looking before ICs arrived. What the web page describes is a
> > kludge QAM
> > system.
> >
> > Doug McDonald
> >
> >
> >
> >
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