[opendtv] Re: PAL
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 18 Dec 2006 14:02:12 -0800
Thanks Don,
I've also tried to explain this to the group several times over the years.
However, I also was not aware that there were 625/50 NTSC systems; which
would occur if NTSC was adopted by a region with 50 Hz power line frequency.
Would that be Japan?
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Donald Mccroskey
> Sent: Sunday, December 17, 2006 11:27 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: PAL
>
>
> 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
> > >
> > > >
> > >
> > >
> > >
> > >
> > > ----------------------------------------------------------------------
> > > 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.
> > >
> > >
> >
> >
> >
> >
> > ----------------------------------------------------------------------
> > 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.
> >
> >
> >
> > ----------------------------------------------------------------------
> > 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.
> >
> >
>
>
>
>
> ----------------------------------------------------------------------
> 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.
>
>
>
> ----------------------------------------------------------------------
> 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.
>
>
----------------------------------------------------------------------
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:
