Questions regarding Upconversion are pretty frequent on this site. Here's a summary which provides a few "rules of thumb", however, please realize that, as with all rules of thumb, there will be exceptions.
Upconversion is a term that can apply to "deinterlacing" (taking a 480i signal and making it 480P) or any "bettering" of the signal say 480i to 1080i, or 720P/1080i to 1080P/4K)
1. Upconversion in a STB (Set top box):
STBs are usually the worst place to do upconversion, so if...
FAQ - On Upconversion
Upconversion is a term that can apply to "deinterlacing" (taking a 480i signal and making it 480P) or any "bettering" of the signal say 480i to 1080i, or 720P/1080i to 1080P/4K)
1. Upconversion in a STB (Set top box):
STBs are usually the worst place to do upconversion, so if...
FAQ - On Upconversion