SWFINTPR.SWF
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In one second, interlacing displays 30 sets of odd lines and 30 sets of even lines, resulting in 60 fields per second. Progressive scan is twice as fast with 60 full frames per second. For every half frame of interlaced scan, progressive scan displays a full frame. DVDs and monitors that support progressive scan can convert the 60 fields in interlaced NTSC content to 60 frames by interpolating the missing lines.
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