[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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