On 25 May 2010 at 17:15, Eric Smith wrote:
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.
Didn't Britain briefly experiment with a 405/25 version of NTSC? I
recall seeing a 405 line BW broadcast during a trip to England in the
70s and thought it was the worst picture I'd ever seen since my
family's 9" Philco set. The frame rate was quite visible to my eye.
--Chuck