>> 2) Noise. I wonder how screen remains stable even when
>> signal is noisy. There must be some filtering in a TV. I'll
>> try to dig the sync separator circuit from an old TV.
>>
>ISTR that TV's use a "Flywheel" circuit, which is actualy a phase locked
>loop.  This would give a good degree of noise immunity.  This could =
probably
>be implemented with the scenix, although I'll leave that as an exercise =
for
>the reader :o)
You can also get a big improvement by adding a holdoff, so that when
you get a sync pulse you ignore any input until just before you're
expecting the next one - very simple and pretty effective. Checking
the sync pulse width & rejecting too-short ones can also help.=20

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads