[opendtv] Re: PAL

  • From: "negrjp" <negrjp@xxxxxxxxxx>
  • To: "opendtv" <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 18 Dec 2006 06:40:39 -0200

Donald wrote:

>   Some world TV standards use a 525 line PAL color
system, and others use a 625 line NTCS color system.

Yes, Brazil and Laos uses M-PAL 525 line system.
In Europe, NATO military bases uses NTSC 625 line system.

Jonas.

 
> 
> -----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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