A satellite television system that provides live television programming to
passengers by integrating direct broadcast satellite services into an
in-flight aircraft entertainment system. The system has an antenna
disposed on the aircraft that is pointed at a plurality of satellites
that are part of a direct broadcast satellite system. The antenna is
controlled by an antenna controller and antenna interface unit that send
control signals and process status signals to steer the antenna. The
antenna is steered to lock it onto RF signals transmitted by the
satellites. The antenna interface unit downconverts the received encoded
RF signals to provide encoded left hand circularly polarized RF signals
and right hand circularly polarized RF signals that contain different
sets of television channels. The downconverted encoded RF signals are
processed by a receiver to provide encoded video and audio signals of
different television channels. The receiver does not decode or D/A
convert the downconverted signals. The encoded video and audio signals
containing the plurality of channels are modulated in a modulator, which
also is used as a combiner to modulate signals derived from other video
and audio sources. The modulated and encoded video and audio signals are
routed to a video and audio distribution system which distributes the
encoded video and audio signals to each passenger's seat. Seat
electronics circuitry is located at each passenger's seat that contains a
demodulator, decoder, digital to analog converters, and an optional
tuner. The seat electronics circuitry demodulates, decodes and D/A
converts the modulated and encoded video and audio signals into signals
that may be viewed and heard by the passenger at that seat.