"Dave Plowman (News)" wrote:

In article ,
Michael A. Terrell wrote:
"Dave Plowman (News)" wrote:

In article ,
Michael A. Terrell wrote:
Composite video has negative sync.

Not as transmitted; tip of sync is peak output power.

That was done so that any 'snow' in a weak picture was white,
instead of black dots.

Quite the reverse, actually.

Really? Show us a valid cite for NTSC Visual modulation that agrees
with you. (Type M) An old term in the US TV industry for sync was
'Blacker than Black'. If the modulation is inverted, any loss of signal
strength causes sync to be affected before the video. I've read the
NTSC documents and arguments that were published at the time the system
was created.

PAL as used in most of Europe uses negative modulation - and one reason
was precisely that interference is less noticeable being black flecks
rather than peak white.


NTSC uses 'Negative Modulation' as well, and for the reasons I've
stated.

Did you even look at the URL I posted?

http://en.wikipedia.org/wiki/NTSC


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