The Future Of Radio
Radio broadcasting now includes a newer, better digital system known as DAB, digital-audio broadcasting. Early tests indicate that a switch to digital imparts compact-disc quality to radio programming. There are two possible modes for DAB. In Europe, completely new stations on a different band of frequencies is favored. In the United States it seems probable that digital information will transmitted as information superimposed on the programming modulation now used. The digitized audio can be so much lower in power than the "main" programming that it will be inaudible to listeners with analog receivers. Early program tests of this system have been successful and increases in audio quality have been significant.
The 1995 ARRL Handbook. The American Radio Relay League, 1995.
Hobson, Art. Physics: Concepts and Connections. New York: Prentice-Hall, Inc., 1995.
Jacobs, George, and Theodore J. Cohen. The Shortwave Propagation Handbook. Cowan Publishing Corp., 1970.
Ostdiek, Vern J., and Donald J. Bord. Inquiry Into Physics. St. Paul: West Publishing Company, 1995.
Now You're Talking. The American Radio Relay League, 1994.
Science EncyclopediaScience & Philosophy: Quantum electronics to ReasoningRadio - The History Of Radio, Radio And The Electromagnetic Spectrum, How Radio Signals Are Created, Modulation - Demodulation