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televisionsystems(standard-denitionTV,
or SDTV). HDTV is digitally broadcast;
the earliest implementations used analog
broadcasting, but today digital television
(DTV) signals are used, requiring less
bandwidth due to digital video compression.
U
UHF (Ultra high frequency)
In radio or TV broadcasting: it is the frequency
range of electromagnetic waves which lies
between 300 MHz and 3 GHz (3000 MHz).
V
VHF (Very high frequency)
In radio or TV broadcasting: it is the frequency
range of electromagnetic waves which lies
between 30 MHz and 300 MHz.
6 Glossary
A
Amplier
A device, either a single stage or a large scale
circuit with multiple stages for creating gain,
i.e. it makes small signals larger.
Antenna
A device, such as a rod or wire, which picks up
a received radio frequency signal or radiates a
transmitted RF signal.
C
Coaxial
A single copper conductor, surrounded with
a layer of insulation, covered by a surrounding
coppershieldandnally,aninsulatingjacket.
An unbalanced transmission line with constant
impedance. In audio, this type is commonly
used for low level, line signals terminated in
RCA connectors.
D
DVB (Digital Video Broadcasting)
DVB is a suite of internationally accepted open
standards for digital television.
F
FM (Frequency Modulation)
In radio broadcasting: a method of modulation
in which the frequency of the carrier voltage
is varied with the frequency of the modulation
voltage.
H
HDTV (High-Denition Television)
It is a digital television broadcasting system
with higher resolution than traditional
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