28 May
2010
28 May
'10
3:39 p.m.
From: ard at p850ug1.demon.co.uk
Subject: Re: Video standards (was RE: Pravetz 82)
To: cctalk at classiccmp.org
Date: Fri, 28 May 2010 21:24:11 +0100
Not if you can go on for a bit about the burst carrier frequency and how they picked it...
Quite a bit of thought went into NTSC, to keep it compatible and add color. The burst
3.758 MHz is chosen to not fit a harmonic of the line rate, frame rate, and that was
adjusted too, from 60Hz to 59.xxx, xxx, =975 if I recall but its been a while.
Randy
_________________________________________________________________
The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with Hotmail.
http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=…
Later, someone decided that the US should have a
letter too. Let's make it
M! Yes! NTSC-M works! (I have no clue whose idea this was, but it makes a
mess of the whole NTSC nomenclature)
Beleive-it-or-not, PAL-M exists. It's PAL using 525 lines/60Hz vertical,
and a colour subcarrier around 3.58MHz (but not indentical to the NTSC
carrier for techncial reasons). There is also PAL-N (625/50Hz PAL, but
with a subcarrier around 3.58, not 4.43 MHz). I have a PAL-N encoder and
decoder somewhere...
Would I get flamed too much if I talked about NTSC-B (or NTSC-G, NTSC-I)
to refer to a 625 line colour signal with NTSC-like colour encoding?
-tony