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.