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 "href="module.php?name=Lexikon&file=search&eid=1&query=Frequency Shift Keying">Frequency Shift Keying", the modulation scheme used by such machines), and later, facimile. (1995-03-14)
