Radio broadcasts have grown over the last 15 years since the US Federal Communications Commission developed the S-band [2.3 GHz frequency] for digital audio radio services. Since the launch of FM itself, satellite broadcasting has been able to broadcast in static, high-quality sound over a distance of more than 20,000 miles, one of the most important developments in the field of broadcasting. Sirius, XM and satellite broadcaster WorldSpace have taken advantage of this technology and have purchased it from the masses worldwide. But how does satellite broadcasting really work?
All satellite radio services have three things in common: actual satellites, terrestrial repeaters and radio receivers. These components are used to broadcast radio signals that customers hear after ordering a service. However, each of these service providers [Sirius, XM and WorldSpace] utilizes a unique broadcast system to provide sound [radio signals] to users. For example, Sirius uses satellites that orbit the Earth in an elliptical pattern. Although this seems to have nothing to do with the average listener, it is important because the Sirius' model allows the satellite to reach higher possibilities in the sky and therefore loses less signal than other providers. XM, on the other hand, runs geosynchronous satellites that orbit the Earth in a synchronized pattern consistent with the Earth's usual motion. Radio reception is achieved, and for the sake of clarity, the XM then uses an antenna network that retransmits the signal to avoid interruptions in the vicinity of tall buildings, bridges or hills.
So know that we know how the radio signal itself is transmitted, when is the music added to the mix? At the Digital Broadcasting Center, the broadcast producer is responsible for choosing when to play the song. These centers store music in digital and CD formats, and often have studio space to record performers and deliver their voices. The very high-quality sound that users hear is achieved through a process called digital compression, which uses algorithms [a set of rules to solve the problem, or process into smaller, simpler steps] to squeeze as much as possible The sound is passed into the available bandwidth. Satellite radio is the only radio type that is sufficient to decode these signals, which is why you need to subscribe and why you can't access the same content via daily AM/FM dialing. The uniqueness of satellite broadcasting, sound quality, popularity and commercial free features are key factors in enabling companies to provide satellite services at reasonable prices.
Orignal From: How satellite broadcasting works and why it is so popular
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