[opendtv] Re: Disney to Sell Moviebeam
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 27 Sep 2005 09:20:14 -0400
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
>
>
>
>
> ----------------------------------------------------------------------
> You can UNSUBSCRIBE from the OpenDTV list in two ways:
>
> - Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
>
> - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
>
>
>
> ---------------------------------
> Yahoo! for Good
> Click here to donate to the Hurricane Katrina relief effort.
>
>
>
> ----------------------------------------------------------------------
> You can UNSUBSCRIBE from the OpenDTV list in two ways:
>
> - Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
>
> - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
>
> ---
> [This E-mail scanned for viruses by Declude Virus]
>
>
---
[This E-mail scanned for viruses by Declude Virus]
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts:
