[opendtv] Re: News: CEA FORECASTS CONSUMER ELECTRONICS REVENUE
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 13 Jan 2007 13:08:19 -0800
Makes sense.
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Mark Schubin
> Sent: Saturday, January 13, 2007 1:05 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: News: CEA FORECASTS CONSUMER ELECTRONICS REVENUE
>
>
> When the source luma and chroma are properly filtered, it's hard to mess
> them up. The first full-bandwidth decoders were comb filters operating
> on non-filtered luma and chroma. They, of course, were imperfect.
>
> TTFN,
> Mark
>
>
> Dale Kelly wrote:
> > Mark Wrote:
> >
> >> If you envision the NTSC spectrum in three-dimensional space, luma is a
> >> large, central octahedron. Chroma is smaller octahedra orbiting it.
> >> It's only when you look at it in two dimensions that they appear to
> >> interfere, just as the moon (or any other satellite) would appear to
> >> occupy the same space as the earth when viewed in two dimensions.
> >>
> >
> > Very interesting analogy Mark and I'm winging it here!:
> > Perhaps if one hypothesized these spectral octahedra as being
> somewhat akin
> > to celestial objects and while not physically touching, had an
> energy source
> > that did overlap, such as gravity. Such an energy source would create
> > "parasitic" distortions.
> >
> > The encoders interleave the luma and chroma energy and in a
> perfect device,
> > they would not occupy the same space and therefore would have no
> > interaction. However, in reality, those energies encounter non
> linearity's
> > which do create secondary IM energies and which do result in distortion
> > artifacts. My more simple assumption (something that I can understand
> > anyway!) is that these newer encoders not only better control
> the sources
> > these distortions but also filter that energy which does exist - two
> > dimensionally.
> >
> > Still pondering...
> > Thanks, Dale
> >
> >
> >
> >
> >> -----Original Message-----
> >> From: opendtv-bounce@xxxxxxxxxxxxx
> >> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Mark Schubin
> >> Sent: Saturday, January 13, 2007 11:43 AM
> >> To: opendtv@xxxxxxxxxxxxx
> >> Subject: [opendtv] Re: News: CEA FORECASTS CONSUMER ELECTRONICS REVENUE
> >>
> >>
> >> If you envision the NTSC spectrum in three-dimensional space, luma is a
> >> large, central octahedron. Chroma is smaller octahedra orbiting it.
> >> It's only when you look at it in two dimensions that they appear to
> >> interfere, just as the moon (or any other satellite) would appear to
> >> occupy the same space as the earth when viewed in two dimensions.
> >>
> >> TTFN,
> >> Mark
> >>
> >>
> >> Dale Kelly wrote:
> >>
> >>> Must have trimmed down the sideband energy for those frequencies?
> >>>
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: opendtv-bounce@xxxxxxxxxxxxx
> >>>> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Mark Schubin
> >>>> Sent: Saturday, January 13, 2007 11:24 AM
> >>>> To: opendtv@xxxxxxxxxxxxx
> >>>> Subject: [opendtv] Re: News: CEA FORECASTS CONSUMER
> ELECTRONICS REVENUE
> >>>>
> >>>>
> >>>> Dale Kelly wrote:
> >>>>
> >>>>
> >>>>> Rather than using a bandpass filter I assume that
> >>>>> the newer hardware allowed for notched filtering.
> >>>>>
> >>>>>
> >>>>>
> >>>> It can be a lot fancier than that. The CDL Prism modulator,
> >>>>
> >> one of the
> >>
> >>>> first with full bandwidth, used two dimensional filtering of
> both luma
> >>>> and chroma to provide un-notched (but also non-interfering) full
> >>>> bandwidth of each.
> >>>>
> >>>>
> >>>> TTFN,
> >>>> Mark
> >>>>
> >>>>
> >>>>
> >>>>
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