amplitude modulation (AM) A form of radio transmission. Broadcasts on the short-, medium-, and long-wave bands are transmitted by amplitude modulation. The sound signals to be transmitted are superimposed on a constant-amplitude radio signal called the carrier. The resulting modulated radio signal varies in amplitude according to the strength of the signal. Related category RADIO ASTRONOMY AND COMMUNICATIONS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |