DVB-T/T2 terrestrial receiver
MERlin
Glossary
2013 dB Broadcast Ltd
49
Version 1.2
PLP
Physical Layer Pipe. See MPLP.
PSI / SI
Program specific information.
QAM
Quadrature Amplitude Modulation. A digital modulation technique
that allows very efficient transmission of data over media with
limited available bandwidth.
QPSK
Quadrature Phase Shift Keying. A digital technique that is widely
employed in direct broadcast satellite or terrestrial transmission
systems
RF (Radio
Frequency)
In broadcasting applications, the signal after the modulation
process.
RS
Reed-Solomon.
SNR
Signal to Noise Ratio.
Symbol Rate
Replacement term for Baud; a unit of signalling speed, the
number of times a signal on a communications circuit changes.
Termination
An impedance at the end of transmission line that matches the
impedance of the source and of the line itself. Proper termination
prevents amplitude errors and reflections. ASI transmissions use
75Ω transmission lines, so a 75Ω terminator must be at the end of
any signal path.
Tuner
Any device or apparatus used for selecting and controlling the
operating frequency of a circuit or equipment, such as the channel
selector in a television receiver.
UTP
Unshielded Twisted Pair.
Viterbi
Algorithm for Forward Error Correction.
