upconvert
Upconvert is the process of increasing the frequency of an electrical signal from a lower to a higher frequency. In RF engineering, it is typically accomplished by mixing the input signal with a local oscillator (LO) signal in a nonlinear device such as a mixer. The nonlinear mix produces sum and difference frequencies, and the desired output is selected by filtering to reject unwanted components. Upconversion is the opposite of downconversion and is a key step in many heterodyne systems.
In receivers, upconversion translates signals from an RF front end to a higher intermediate frequency or to
Other uses of the term appear in digital video and image processing, where upconversion can refer to