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SCEPTRE X42 HDTV User Manual
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2. 4:3
Most analog TV channels have 4:3 signal formats. If the original 4:3 aspect
ratio (1.33:1 source) is preserved, black bars are added to the left and right
of the display image. This aspect keeps that aspect ratio and shows you the
black bars on the side.
3. Zoom 1
When watching a 4:3 aspect ratio TV or movie, this mode zooms in to cut off
most of the black bars on the side while preserving the 16:9 ratio. Because
of the zoom, the top and bottom are cut off as well.