Satellite TV receiver
The use of satellites for the distribution of television signals has made possible the delivery of a wide variety of news, entertainment, educational and sports programming to cable system subscribers. The satellite broadcasting system, using a satellite positioned at several hundred kilometers high above the earth, is capable of transmitting a broadcast signal to much wider area than other broadcasting systems. Home television users or viewers obtain such satellite signals via either a satellite receiving antenna/system located at the user's residence or alternatively by way of a cable distribution network including a cable headend. A digital satellite television system for direct television broadcasting includes a transmitter for transmitting television signals including video and audio components to a geostationary satellite. The satellite retransmits the received television signals to an outdoor antenna assembly that includes a dish-like antenna and a block converter. Digital television is digitally modulated when broadcast over satellite systems using phase shift keyed modulation schemes. The signals are typically received at Ku-band or C-band via a satellite dish antenna. The dish-like antenna directs the received television signals to the block converter that converts the frequencies of the received television signals to respective lower frequencies. The signals are first amplified and then downshifted to a predetermined frequency band, typically in the L-band, in the range 950 MHz to 2150 MHz. This function is performed within the Low Noise Block (LNB), a subsystem contained with the satellite dish assembly. The signal is then sent via a coaxial cable to the set-top box unit located indoors. Television receiver systems for capturing satellite transmissions, processing the signals received, and selecting one for reception include an antenna and its associated electronics which feeds a group of television channels to a receiver which then processes and selects one of the channels for reception and display on a conventional television set. Satellite television receivers decode satellite broadcast television signals for display by a television monitor. These receivers are commonly used in earth stations by homeowners in connection with an antenna to directly receive satellite broadcast television signals from one of a number of satellites in geosynchronous orbit about the equator. The satellite TV receiver tunes, demodulates and otherwise processes the received television signals to provide video and audio signals with a NTSC, PAL or SECAM format suitable for processing by the TV set.
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