25 May
2010
25 May
'10
5:15 p.m.
Pete Turnbull wrote:
Yes, really. NTSC, PAL, and SECAM are colo[u]r encoding methods,
nothing more. They don't mandate the number of vertical lines,
horizontal frequencies, etc, although certain other standards do tend
to be uniquely associated with certain colour encoding standards.
I can't speak for PAL and SECAM, but the NTSC standard most certainly
does specify the number of vertical lines, interlace, and horizontal and
vertical sync frequencies. It had to, since the frequencies are
different than the sync frequencies used for its predecessor
black-and-white system (525/30). The original NTSC standard included
both 525/29.94 and 441/30 scan rates, but the latter was dropped at the
last meeting of the first NTSC on 8-March-1941.
While there exist other unofficial NTSC-related systems such as the
so-called "NTSC-J" and "NTSC 4.43", these are NOT part of the NTSC
standard. While it is possible to use NTSC-compatible color encoding
with different scanning parameters, the result is *not* NTSC.
Eric