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The Magic of the Satellite Radio
Today,we listen to songs on the radio with complete clarity and high quality - thanks to the invention of the satellite radio which considered to be the biggest improvement in broadcasting since FM has been introduced.
A listener will never get static interferences when listening to either of the more than 100 radio channels. This is because the satellite radio signal can be broadcasted more than 35,000 kilometers or 22,000 miles.The idea of the satellite radio started in 1992. The United States Federal Communications Commission just granted the S band (a spectrum) for the Digital Audio Radio Service. The grant included the license allocated to XM Satellite Radio and Sirius Satellite Radio to broadcast the band in 1997. To date, we have three companies providing satellite radios all across the globe - Sirius, XM and WorldSpace.
All these companies offer different broadcasting systems. This only means you need to buy different hardwares when subscribing to any of these companies. Each company have three things in common: the ground repeaters, radio receivers and the satellites. All three; however, broadcast in different ways. In the case of XM, it uses geostationary satellites located above the equator and with orbits synchronized to the Earth's movement. To ensure high-quality sound and clarity,XM satellite radio service installed networks of repeater antennas. These antennas receive the radio signal coming from the satellites and retransmits it to the subscriber's receiver. Sirius, on the other hand, makes use of satellites that include unique and elliptical orbits surrounding the Earth.
The orbits are all around the Earth. They allow these satellites to position themselves higher than the geostationary preventing signal loss. This is also the reason why XM has more terrestrial repeaters than Sirius.
All satellite radio services have broadcast centers. These centers store a large amount of music formatted in both CD and digital. Radio jocks and programmers select which songs to play at a certain time. Studios are also managed by digital studio companies with artists performing live. The materials and songs are transmitted to sateliites in digital format to ensure high quality sound. First, the signal is encoded by the satellite. It then gets transmitted to the repeaters antennas before its is finally transmitted to the radio receiver. The radio receiver decodes and plays the sound.The whole process us very fast and reliable. Thanks to digital compression which is a technique using sophisticated algorithms to compress as much material as possible using the available bandwidth. Upon your subscription to your satellite radio provider, you will be needing the proper radio equipment. And considering thhe fact that traditional radios can hardly decode signals received from satellites, a special equipment would be highly essential.
Satellite radios became popular as an effect of the various technological advancements which inspired its manufacturers to offer the receivers at a good price.
To date, the satellite radio continues to do very well in the market considering its commercial-free feature.
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