Re: seizures (old)// frame rates in US TV

Patrick asked,

I don't understand then the option between 30 and 60 frames per second.
what for ?

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The "appearing" number of frames on NTSC television is 30 per second. The
number 60 comes from the fact that an NTSC signal scans twice for each frame,
projecting first one half of the frame data, then the other half. I am still
trying to figure out whether this data is interleaved, or whether you get the
top half, then the bottom half. I suspect the former.

- Bascom Guffin
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