[opendtv] Re: France bids farewell to SECAM
- From: "Hunold, Ken" <KRH@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 14 Dec 2011 09:56:16 -0500
Changing the burst amplitude will not necessarily change the color
saturation, unless you have a "helpful" circuit in place to "correct"
the overall subcarrier amplitude. A studio monitor shouldn't change
saturation until the burst amplitude is too low to be recovered.
You are correct that changing the phase of the burst will make a "not
standard" signal. You will be changing the SC/H phase (subcarrier to
horizontal sync relationship.) Most people didn't know there *was* a
relationship until they started using sync generators that created the
sync and subcarrier signals digitally. Leitch was one of the first
manufacturers to do this, and they *seemed* extremely difficult to
adjust until you learned what they were doing. They were ahead of their
time, but I'm sure they took a beating along the way.
Once you got the SC/H phase set correctly, timing large NTSC systems was
much easier. Of course, making every camera encoder and NTSC source do
it right was sometimes not a trivial matter...
Ken
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
On Behalf Of Mike Tsinberg
Sent: Wednesday, December 14, 2011 8:39 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: France bids farewell to SECAM
Actually to affect NTSC modulated signal you need to adjust color burst
only because it is used as the reference for demodulation process. If
you change the subcarrier used for the burst and the actual signal there
will be no change. By reducing amplitude of the color burst you will
increase color saturation and by changing its phase you will adjust the
hue. However, changing burst will make a not standard NTSC - the color
bars will not be in standard location on the vectorscope.
Best Regards,
Mike Tsinberg
http://www.keydigital.com
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
On Behalf Of Mark Schubin
Sent: Tuesday, December 13, 2011 6:02 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: France bids farewell to SECAM
On 12/13/2011 5:57 PM, Olivier Houot wrote:
> And what about color adjustments, by the way ? Can you do that in PAL
> / NTSC without demodulation?
Sure!
Adjust subcarrier amplitude for hue and phase for saturation.
TTFN,
Mark
----------------------------------------------------------------------
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:
