Re: Genlock circuits

>. Are
>all the feeds the same programming, or different? And how >many
destinations?

The source is the same. The number of destinations is actually
limitless. So far, not every network needs to provide the alert
information, but power granted is power abused, so sooner or later the
FCC will force everyone to get on board with it.

> Any device (unless very
>high quality (and complex and costly)) will degrade video >quality,
and if the
>device fails, the signal could vanish or become corrupted - not a
>good thing.

Watch the weather channel. Much of that is their CG stuff. Its quality
video.

>Active bypassing could be implemented, but you might get >glitches
when switching
>the CG Mux in and out.

That is why it needs to be genlocked, or TBC'd.

>And some fault-tolerance is in order - perhaps even a
simple relay to "bypass" the entire feed if a fault is detected, but
having a
fault like this could drive a video tech bonkers. Sounds like a fun
project. :)

All broadcast CATV hardware has to be outfitted with a failsafe bypass
to return everything to network if there are problems. Of course, the
best laid plans....... <g>


> p.s. Many people dislike scrolling junk on the screen. Same with
logos, ads,
channel numbers, etc. A surprising number of older folk can't read it,
so if the
text is important, consider making it big and high-contrast.


You will have to take that one up with the FCC, as I think they
mandete the text size and other details when it comes to their alert
system. FWIW, I agree I don't own a TV with the resolution to make out
the scores during the basketball games, even with my glasses on <g>

Thanks,

John

.

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