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Wednesday, February 5, 2014

Overall system (The Overall System)

Early satellite TV viewers were explorers too. They use satellites are expensive to find special items that are not intended for a large audience . Satellite dish and get audiences used as a signal station in the country. Operation of the space agency NASA and the specialized agencies on the other transmitters , many live satellites to beam live between those who own the satellite , some still searching for an item of this broadcast. through its satellite But today, watching TV stars fro most viewed television via a satellite broadcast (Direct Broadcast Satellite-DBS) as DirectTV or The Dish Network provider DBS select various items and broadcast them to . members in the package . Essentially, the goal of the service is to bring the various channels are dozens or even hundreds of channels to your television in almost any format to the cable TV competition .

The broadcast of the service is completely digital , unlike in the past. This means that these items have a better picture and sound quality dramatically. Satellite early broadcast radio the C-band , a radio frequency 3.4 GHz Hz to 7 GHz Hz (GHz) satellite broadcasting digital signals in the frequency Ku - the Ku. -band (12 GHz to 14 GHz) with the major components included in the system with 5 satellite DTH (Direct to home) , including production items , a diffusion signal , satellite dish and receiver.



Source production Typically the various channels The program for broadcast . The provider does not produce itself. But paying other companies (such as HBO or ESPN) for the rights to broadcast via satellite and in this case it looks more like a broker between you and the source list. ( Cable TV companies are operating with the same principles ) .

Centers for Broadcasting Is the center of the system. Centre for Broadcasting Television providers receive signals from the source list and then broadcasting a signal to a satellite in orbit. geostationary orbit.

Satellite receives signals from the broadcast station . Then re -sending them back to the ground.

Satellite viewers receive signals from a satellite . (Or multiple satellites in the same area of ​​the sky) signal through to the receiver in the viewer's house .

Performed on receiver signal and send the signal through to the TV receiver use in general . TV Show (The Programming) Satellite TV providers have been various items from the second source is broadcast on national television. - Stations that receive signals from satellites then send the signal broadcasting to new satellites (such as HBO, ESPN and CNN) , and local television stations such (NBC, ABC, PBS and Fox , a TV station that agrees with . obligation to the station's broadcasting network. In specific areas ) , most broadcast stations have also submitted an entry for Cable TV. And local television stations were broadcasting their own broadcasts .

TV broadcast stations always have zero for classified items for delivery to geostationary satellites . (Geostationary Satellite) broadcast center uses large satellite dishes to receive signals from multiple analog and digital stations.

Most local stations do not transmit a signal to a satellite list . Consequently , service providers must find other ways to get the signal from these stations. If a service includes a list of local television stations in specific areas. It has to be something a bit more room inside the station , which includes tools to communicate the 2-3 receiver in this tool directly from the broadcaster through fiber optic cables . Or from the antenna to get the signal to the control center broadcasting.

Broadcast control center converts all of this information into a digital encode uncompressed , high-quality at this point is composed of large data encoded a 270 megabyte per second (Mbps) for each channel . In order to send a signal from this point . Broadcast control center to compress data. Otherwise, data will be larger than the satellite can bear.

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