What is the process called that creates new frequencies by mixing two frequencies?

The process of creating new frequencies by mixing two frequencies is known as heterodyning. In this technique, two original frequency signals are combined in a non-linear mixer, resulting in new frequencies equal to the sum and difference of the original frequencies. This principle is commonly applied in radio technology, where it is used in receivers to shift signals to a different frequency range for easier processing.

Heterodyning is fundamental in the design of communication systems because it allows for the extraction of specific frequency components from a complex signal and enables effective signal processing. The generation of intermediate frequencies during this process is crucial for tuning and amplifying signals in radio and other communication technologies.