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Interlaced scanning is a broadcast process used in TV sets in which half the lines are transmitted as one field and the other half is transmitted as the second field. These two fields are displayed sequentially to form an image. Standard-definition television is broadcast at a total of 525 interlaced lines, of which 480 of those lines are visible (hence the term 480i).High-definition television has several scan rates. The most common of these is broadcast at a total of 1125 interlaced lines, of which 1080 of those lines are visible (hence the term 1080i).