Upconvert changes composite to s-video to component/hdmi/dvi depending on pre/pro or receiver.

Upscaling changes resolution from 480i to 480p or 720p or 1080i or 1080p. This is done in newer tvs and newest receivers.

The only problem with no connection from receiver to tv is no onscreen display. Little lines on the pre/pro is all you get. Some have corrected this problem by adding a small tv to get a pre/pro feed.