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Re: [OM] synch to TV

Subject: Re: [OM] synch to TV
From: AG Schnozz <agschnozz@xxxxxxxxx>
Date: Wed, 6 Feb 2002 06:59:17 -0800 (PST)
> I wonder if it's synced to the TV so it flashes only during
> the interframe
> interval? (every 60th of a second)

The most definitely are not synced to anything but the camera. 
Watch any pro basketball game on TV and you'll see flashes going
off every time anything happens near the basket.

It has gotten a lot better lately with the latest digital video
cameras and image processing. There is actually a filter applied
in the digital video switcher that will reduce or eliminate the
one "frame" light burst.  The new video switchers apply a 1-3
frame delay so that they can read the next frame.  If the flash
fires during just one frame the switcher will either eliminate
the frame or average the previous and next frames together. 
Digital video compression requires a steady video source
otherwise every single one of those strobe flashes will require
a complete video image generation.  Five or six strobes firing
in a second or two can increase video transmission bandwidth by
100 times.

Unfortunately, most high-powered strobes at ball games tend to
show up in two consecutive frames.

AG-Schnozz


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