How Broadcasting work

DTH operators transmit the video channels to the satellite and also supply the satellite receiver to the users / subscribers. They take the video signals either from other satellites are Terrestrial through optical fibre cable. Each video and audio signal is fade to is encoder for Digital compression. As the uncompressed video signal ok bye is more than 200 megabits per second (MBPS), which requires large bandwidth for transmission, the encoder compresses the video data to about 2 to 5 MBPS using Complex algorithms point the compression is achieved by reducing the redundancy in the signal and also by removing those components that will not be noticed by the human visual system.

In the data stream, service information is added which allows the Decoder to tune to a particular service and also to provide on screen menu of programs card electronic programming guide (EPG). The program is scrambled and encrypted so that only authorised subscribers can receive the signal. Each set-box can be addressed by the broadcaster for receiving the desired channels. Many broadcasters use advanced compression Technology called MPEG-4. This cuts the bandwidth of TV signals to almost half of that used by MPEG-2. Thus, is the number of channels per transponder can be transmitted. Though the compression ratio is more, the picture quality is not affected and remains almost the same.