DVB-T/T2 terrestrial receiver
MERlin
2013 dB Broadcast Ltd
46
Version 1.2
Glossary
8-VSB
Eight discreet amplitude level, “vestigial side-band” broadcast
transmission technology. VSB is an analogue modulation
technique used to reduce the amount of spectrum needed to
transmit information through cable TV, or over-the-air broadcasts
used in the NTSC (analogue) standard. 8-VSB is the U.S. ATSC
digital television transmission standard.
Adjacent Channel
Interference
Interference caused by extraneous power from signal in an
adjacent channel. The problem is often caused by the inability to
produce perfect filters without roll off. See
Frequency Offset
.
Ambient
The atmospheric conditions surrounding a given item. Normally in
terms of factors which influence or modify, such as temperature or
humidity.
Amplitude
The magnitude of variation in a changing quantity from its zero
value.
ASI
Asynchronous Serial Interface.
Attenuation
A reduction in power. It occurs naturally during wave travel,
through lines, waveguides, space or a medium such as water. It
may be produced intentionally by placing an attenuator in circuit.
The amount of attenuation is generally expressed in decibels per
unit of length.
ATSC
Advanced Television Systems Committee. Formed to establish
technical standards for US advanced television systems. Also, the
name given to the digital broadcast transmission standard.
Bandwidth
The range of frequencies over which signal amplitude remains
constant (within some limit) as it is passed through a system.
BER
Bit Error Rate. A measure of the errors in a transmitted signal.
Bit errors are caused by interference or loss of signal, which can
result in disruption to the stream of bits composing the DTV
picture.
BNC
A radio frequency connector with an impedance of 75
Ω, designed
to operate in the 0 to 4 GHz frequency range.
