-----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.
