I have a stereo camera head which has two small CCD cameras, and can
output the following NTSC signals:

1.  One separate signal per camera, simultaneously outputting both signals
(one composite signal per camera).  I believe that these two signals have
the same sync signals.

2.  One signal that is interlaced as follows:  Even fields from camera 1,
odd fields from camer 2.


I also have a head-mounted stereo display device which expects a frame
interlaced NTSC input.  Baically it displays FRAME 1 (two fields) on the
left display, and FRAME 2 (the next 2 fields) on the right display.

I would like to hook these two devices together in order to get real-time
remote stereo input to my eyes.

SO...What [I think] I need is a circuit which takes the two in-sync
composite inputs, and alternates between the two signals to output a
single signal which is appropriate for the head mount display.

My plans are to get a circuit (any suggestions?) that can detect the start
of a frame, and then with a little logic, switch between the two inputs.
What I am concerned about is how this switching circuit will affect the
sync signal on the outgoing signal.

Anyway, I'm looking for input from anyone..

Thanks
-Steve

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