not sure if this is dumb question but I was reading something about "beats" and saw some similarities with AM so I got to a conclusion if you have just two waves (same phase) with similar frequencies etc. sin(x)+sin(1.1x) you can maintain AM or...not? if not, why not? if yes than why do we need that "extra wave" (aka carrier wave)? when you mathemathicaly "decompose" simple AM you get these three things: carrier wave + two sidebands, and in my example you get same "AM shape" but with only two sidebands (?) without carrier wave. at the same time I do understand essence of having carrier wave but now this confused me. thanks in advance!