"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.

http://en.wikipedia.org/wiki/NTSC has a condensed descripton of various
TV transmission systems.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida