A device or software that upconverts.

plural of upconverter

(physics) Modified using upconversion.

present participle of upconvert

Third-person singular simple present indicative form of upconvert

(transitive) To convert (an audio or video signal, etc.) from a lower quality or resolution to a higher one.

(radio communications) An electronic device that converts a band of frequencies from a lower frequency to a higher frequency, used in satellite uplinks.