Antenna |
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A device that
collects and radiates electromagnetic waves.
Includes a satellite dish and a broadband antenna.
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Forward Error Correction (FEC) |
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A system of error
control for data transmission.
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Frequency |
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The number of cycles or events per
one second, which is expressed in the unit of Hertz (Hz)
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Intermediate Frequency (IF) |
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A frequency to which
a carrier frequency is shifted as an intermediate
step in transmission or reception.
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Low Noise Block (LNB) Down-converter |
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A low noise microwave
amplifier and converter which down-converts a range
of frequencies to IF range.
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Packet Identifier (PID) |
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A set of numbers that
identifies transport stream packets containing data
from a single data stream.
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Polarization |
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Characteristic of an
electromagnetic wave determined by the orientation
of the electric field vector.
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Quaternary Phase Shift Keying (QPSK) |
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Phase-shift keying in
which four different phase angles are used.
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Transponder |
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Equipment in a
satellite which receives a single uplink channel
from a satellite Earth station, amplifies it,
converts the frequency and changes the polarization,
then rebroadcasts it back to Earth.
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Transport Stream |
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The bit stream formed
prior to transmission of signals by combining the
video, audio and data streams of one service. It
consists of fixed length packets of 188 bytes of
data.
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