[opendtv] Re: PAL
- From: "Donald Mccroskey" <mccroskey2@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 17 Dec 2006 23:26:51 -0800
I wasn't arguing your point, but other postings on the topic were equating
625/50 systems with PAL, and vice-versa. Perhaps that is where my comment
should have appeared. Some world TV standards use a 525 line PAL color
system, and others use a 625 line NTCS color system.
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Dale Kelly
Sent: Saturday, December 16, 2006 9:11 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: PAL
Donald wrote:
> Keep in mind that PAL is a color system only and does not denote
> the number of lines or frame rate.
I'm not certain how this relates to my posting regarding differential phase
distortion being a reason for PAL' introduction. Differential phase errors
do generally only impact color performance.
i.e.: The color systems reference for phase, known as Burst, resides in the
horizontal blanking immediately after the H-sync pulse and it is clamped to
a fixed DC level. However, the color video signals located in the active
picture area vary in DC level with the luminance (brightness) signal. In a
system with differential phase errors, the phase of the color signal will
vary relative to the luminance level, which results in a Hue shift relative
to the fixed burst reference.
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Donald Mccroskey
> Sent: Saturday, December 16, 2006 12:42 AM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: PAL
>
>
> Keep in mind that PAL is a color system only and does not denote
> the number
> of lines or frame rate.
>
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
> Behalf Of Dale Kelly
> Sent: Thursday, December 14, 2006 2:46 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: PAL
>
> I wrote:
> > Al, How was the PAL feature used to resolve those transmission issues?
> > Dale
>
> I answered my own question Al; the differential phase color distortion
> errors very common in the early terrestrial distribution
> equipment, as well
> as in all station transmitters system, would be visually
> corrected. Receiver
> design does not resolve this issue, which has since been resolved
> by better
> and more stable distribution equipment design and improved correction
> equipment.
>
>
> > -----Original Message-----
> > From: opendtv-bounce@xxxxxxxxxxxxx
> > [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Dale Kelly
> > Sent: Thursday, December 14, 2006 12:58 PM
> > To: opendtv@xxxxxxxxxxxxx
> > Subject: [opendtv] Re: PAL
> >
> >
> > Al wrote:
> > > The problem PAL was designed to overcome was the problems with piping
> > > composite video over telephone lines. Broadband telephone
> > lines were much
> > > better in the US than in Europe at the time TV was beginning to
> > > be broadcast
> >
> > Al, How was the PAL feature used to resolve those transmission issues?
> >
> > Dale
> >
> > >
> >
> >
> >
> >
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