Same . UMass Amherst . Ahhh . Those were the days . <| sep |> The Pokemon you thought you were capturing appears on the purple transformation screen before it transforms into Ditto I think getting a screenshot of it with the purple background would be sufficient evidence <| sep |> Most radio uses one of two methods of broadcasting Amplitude Modulation AM and Frequency Modulation FM . Modulation means taking an audio signal music and turning it into some other kind of signal , in this case an electromagnetic one , which a radio will detect and demodulate to reproduce the original audio . With AM , the amplitude of the broadcast signal meaning its power , basically goes up and down in the same pattern as the audio signal . The varying power of the signal carries the audio signal . FM uses a single base frequency called the carrier frequency , and the signal is modulated by changing the broadcast frequency above and below the carrier , called the sidebands .