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Satellite television is delivered by way of communications
satellites. In many areas of the world, satellite television services supplement
older terrestrial signals, providing a wider range of channels and services,
including subscription-only services.
There are three primary types of satellite television usage: reception direct by
the viewer, reception by local
television affiliates, or reception by headends
for distribution across terrestrial cable systems.
Direct to the viewer reception includes direct broadcast satellite or DBS and
television receive-only or TVRO, both used for homes and businesses including
hotels, etc.
The satellite receiver demodulates and converts the signals to the desired form
Sometimes, the receiver
includes the capability to unscramble or decrypt; the
receiver is then called an Integrated receiver/decoder
or IRD.
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