If the satellite radio?

Satellite radio is one of the biggest improvements in broadcasting since the introduction of FM satellite radio signal that more than 35,000 kilometres (22,000 miles) can be divided with total clarity and high sound quality. You never static interference to listen on more than 100 radio stations. The idea behind the satellite radio appeared in 1992, when the Federal Communications Commission of the United States gave a spectrum of S-band (2.3 GHz frequency) radio service for digital audio. The dissemination of this band was imposes license Sirius Satellite Radio and XM Satellite Radio in 1997. Now there are three companies that satellite radio in the world offer: Sirius and XM in North America and WorldSpace in Asia, Europe and Africa.

Each of these companies offer different broadcasting systems because each radio signal is the owner. This means that you need different equipment according to your subscription to one of these companies to buy. However, there are three elements common to all radio services by satellite: satellites, ground repeaters and radio receivers. Various satellites broadcast radio signal transfer in different ways. For example, XM satellite radio using geostationary satellites have jobs that are synchronized with the movement of the Earth. These satellites are located above the Ecuador. Can subscribers receive a signal despite the obstacles, such as buildings, satellite radio service or XM hills, bridges has installed a network of repeaters, antennas that have retrieved from the satellite radio signal receiver Sirius Subscriber, on the other hand, uses satellites have unique elliptical orbits around the Earth. These types of jobs allow satellites get higher in the sky than the geostationary satellites and prevents the loss of signal. This is the reason why Sirius XM ground repeaters so less.

Satellite radio services have digital broadcast centres where a tremendous amount of music in digital format, as well as the format of the CD is stored. Radio programmers have the task of selecting the music currently played there. There is also a large number of studios run by companies of the digital radio, where artists are live. All songs and materials are passed to the satellite in digital format, so that the signal contains very high sound quality. The signal is encoded by the satellite and then pass repeaters, antennas that transmit than the radio receiver that decodes and sound. The whole process is very fast and reliable. Satellite radio would not be possible without digital compression. Digital compression is a technique that uses sophisticated algorithms to compress much material as possible about the available bandwidth. After you create a subscription for a satellite radio provider, you must use appropriate radio equipment. Traditional radio the received satellite signal cannot decode, you need special equipment.

The popularity of satellite radio exploded because of numerous technological advances enabled manufacturers to offer recipients at very attractive prices. The fact that commercial free satellite radio for much of its channels is also an important selling point.

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