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satellite radio
Satellite radio is a radio broadcasting service from satellites. The satellite's signals are broadcast nationwide, across a much wider geographical area than terrestrial radio stations, and the service is primarily intended for the occupants of motor vehicles.〔Edmund L. Andrews, (“F.C.C. Plan For Radio By Satellite,” ) ''New York Times'', October 8, 1992.〕〔Laurent Belsie, (“Digital Audio Broadcasting Plays to Global Audience,” ) ''Christian Science Monitor'', March 9, 1992.〕 It is available by subscription, mostly commercial free, and offers subscribers more stations and a wider variety of programming options than terrestrial radio.〔Anita Jain, “Sirius Satellite Moves,” ''New York Sun'', p. 11, October 29, 2002.〕
Satellite radio technology was inducted into the Space Foundation Space Technology Hall of Fame in 2002.〔(“Satellite Radio Technology,” ) spacefoundation.org, 2002. Accessed May 1, 2013.〕 Satellite radio uses the 2.3 GHz S band in North America for nationwide digital audio broadcasting (DAB).〔(“Satellite S Band Radio Frequency Table,” ) CSG Network, updated August 15, 20011. Accessed April 23, 2013.〕 In other parts of the world, satellite radio uses the 1.4 GHz L band allocated for DAB.〔
Satellite radio subscribers purchase a receiver and pay a monthly subscription fee to listen to programming. They can listen through built-in or portable receivers in automobiles; in the home and office with a portable or tabletop receiver equipped to connect the receiver to a stereo system; or on the Internet.〔http://shop.siriusxm.com/〕
Ground stations transmit signals to the satellites, which are orbiting over 22,000 miles above the surface of the Earth. The satellites send the signals back down to radio receivers in cars and homes. This signal contains scrambled broadcasts, along with meta data about each specific broadcast. The signals are unscrambled by the radio receiver modules, which display the broadcast information. In urban areas, ground repeaters enable signals to be available even if the satellite signal is blocked. The technology allows for nationwide broadcasting, so that, for instance US listeners can hear the same stations anywhere in the country.〔〔Kathleen Kingsbury, (“Satellite radio captures ears of millions,” ) CNN, August 4, 2004.〕
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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