[opendtv] Re: PAL
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 18 Dec 2006 14:48:21 -0800
Jonas wrote
> Yes, Brazil and Laos uses M-PAL 525 line system.
> In Europe, NATO military bases uses NTSC 625 line system.
I believe that you are correct. I recall, in the late 1960s, having to
modify a U.S. made B&W TV to detect the higher frequency audio subcarrier to
allow reception of the Armed Forces channel (and also the German channels,
in B&W). The sets V-Hold control had sufficient range to lock the V
oscillator on the 50 Hz frame rate.
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of negrjp
> Sent: Monday, December 18, 2006 12:41 AM
> To: opendtv
> Subject: [opendtv] Re: PAL
>
>
> 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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