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INTERLACING

One of the fundamental differences in how TV sets and computer monitors generate their images is the fact that standard TVs use interlaced images and computer monitors do not.

TVs generate an image by an electron beam that “draws” horizontal lines from left to right and top to bottom. However, these lines are not drawn one after another, but rather in two passes. In one pass the odd numbered lines 1, 3, 5, and so on are drawn; in the second pass, the even line numbers 2, 4, 6, and so on are drawn. This method, which divides the image into two separate “fields,” is called interlacing. NTSC TVs display almost 30 frames per second, and thus have to create almost 60 fields per second.


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