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Digital Satellite Television, abbreviated DStv, is a Sub-Saharan African direct broadcast satellite service owned by MultiChoice and based in South Africa, with headquarters in Randburg. DStv provides audio , radio and television channels and services to subscribers across 50 countries, [ 1 ] [ 2 ] mostly in South Africa , Nigeria and Zimbabwe .
On August 4, 2008, and October 22, 2008, Goiânia and Curitiba began to receive DTV signal, respectively. Digital broadcast started at Salvador on December 2 and Campinas on December 3, 2008. The government estimated 7 years for complete signal expansion over all of the territory. Analog television is scheduled to be shut down on October 25, 2017.
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The analog signal is frequency modulated and is converted from an FM signal to what is referred to as baseband. This baseband comprises the video signal and the audio subcarrier(s). The audio subcarrier is further demodulated to provide a raw audio signal. Later signals were digitized television signals or multiplex of signals, typically QPSK.
During 2012 several Internet news sites critical of the government experienced server problems, which site owners attributed to government interference. Such disruptions usually lasted a few hours. [25] In 2008 two journalists were arrested for publishing online articles and photos critical of the government. [48]
A broadcaster may opt to use a standard-definition (SDTV) digital signal instead of an HDTV signal, because current convention allows the bandwidth of a DTV channel (or "multiplex") to be subdivided into multiple digital subchannels, (similar to what most FM radio stations offer with HD Radio), providing multiple feeds of entirely different ...
The parabolic shape of a dish reflects the signal to the dish's focal point. Mounted on brackets at the dish's focal point is a device called a feedhorn. This feedhorn is essentially the front-end of a waveguide that gathers the signals at or near the focal point and 'conducts' them to a low-noise block downconverter or LNB.
A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.