Line Doubler (...Tripler

A set of circuits whose purpose is to paint each scan line on the picture tube twice (three times, four times) and thus fill in the gaps between scan lines. A device (with circuits inside) which converts interlaced video to progressive scan video is also referred to as a line doubler. It too delivers output that has twice as many scan lines per second as its input and it may also use the technique equivalent to painting each scan line twice. Click here for more information.