Radio noise is something that crops up often in the field of paranormal research, most often referred to as "white noise." However, white noise is actually just one specific type of radio noise that is characterized by its equal intensity at different frequencies, giving it a constant intensity across all audible frequency ranges.

It is referred to as "white" noise because the random electrical interference that creates it is spread across the whole audio spectrum of frequencies. In the same way that white light is made up of colors of all frequencies, white noise is made up of sounds of all frequencies. These random bursts of varying frequencies have an overall intensity that is constant.

Based on the theory that spirits can reorganize radio noise to form words, some EVP researchers use a white noise source to give spirits a base of raw sound to use to form words. This is done...