[opendtv] Re: PAL
- From: flyback1 <flyback1@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 15 Dec 2006 15:22:44 -0500
John Shutt wrote:
I thought the NTSC cure to green people was VIRS. Gee, whatever
happened to all those television sets out there using VIRS? The FCC
mandated that if we transmit anything on line 19 of NTSC, it had to be
the GCR signal. This displaced the voluntary VIRS that many
professional Proc Amps and at least one consumer television set, RCA,
used to automatically set chroma phase and amplitude. VIRS got moved
to differing lines, and most professional equipment using VIRS could
be reprogrammed to find it, but those consumer TV sets were out of luck.
I guess right about the time that the technology got cheap enough to
enable something like VIRS, the rest of the technology got stable
enough to not require it anymore. Not that GCR was a roaring success,
either.
John
The VIRS signal worked very well except for one problem; some TV
stations mistakenly deleted the whole vertical blanking interval
including the VIRS
in the incoming network proc. amp and reinserted their own VITS and VIRS.
Any distortion in the network signal the original VIRS could have
corrected in consumer TVs got through anyway.
----------------------------------------------------------------------
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:
