Communication, often two-way, of spoken information, by means of electrical signals carried by wires or radio waves. The term was used to indicate transMISsion of the voice, as distinguished from telegraphy (done in {Morse code} and usually called "{continuous wave}" or CW transMISsion), radio teletypewriter (RTTY) transMISsion (also called FSK for "Frequency Shift Keying", the modulation scheme used by such machines), and later, facimile. (1995-03-14)