Re: Converting NTSC to PAL and vice versa

isw <isw@xxxxxxxxxxx> writes:

You're right; the NTSC field rate is 59.94..., and the frame rate is
precisely half that, 29.97... For compliance with the NTSC spec, those
rates must be correct =/- a few parts per million, although most TV sets
can handle a bit more deviation than that
[...]
For best performance, the color subcarrier, the horizontal rate, and the
vertical rate, are all locked together in a very specific way

Back in the good old days of monochrome (black and white) television the
field rate was conveniently the same as the American AC mains - 60Hz.

Then, when NTSC color arrived, and was broadcast over the air, there were
problems with the sync signals and subcarriers interfering with each other,
so the frame rate (which affects everything else, as mentioned above) was
adjusted to to fix this. See, for example, the Color Encoding section of
http://en.wikipedia.org/wiki/NTSC for a detailed explanation.

But - this is only a problem in analog transmission. NTSC works fine at
60Hz otherwise...

As for PAL <-> NTSC conversions, here's something I didn't see mentioned
(although I'm way late reading this thread, and some of it has expired on
my server) -

http://www.mpeg2works.com/

I like this guy's attitude -

| Apple Macintosh ONLY...Does NOT work on a PC... If you are using Windows,
| go away. Do not purchase any of my products until you come to your senses
| and buy a Mac.

Heh.

Billy Y..
.

Relevant Pages

  • Re: Converting NTSC to PAL and vice versa
    ... For best performance, the color subcarrier, the horizontal rate, and the ... Then, when NTSC color arrived, and was broadcast over the air, there were ... In "proper" NTSC, the color information is ... most "TV" outputs on computer video cards do not properly interlace the ...
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    ... > Like ALL NTSC 525/60 televisions the horizontal scan rate is 15,734 KHz, ... > vertical scan rate is 59.94 Hz, and color subcarrier is 3.579545 MHz. ... > A video card installed in your computer with a composite NTSC 525/60 Video ...
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