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Additional
spectral mask
English Wikipedia - The Free Encyclopedia
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Spectral mask
In
telecommunications
, a
spectral mask
, also known as a
channel mask
or transmission mask, is a
mathematically
-defined set of
lines
applied to the levels of
radio
(or
optical
)
transmission
s. The spectral mask is generally intended to reduce
adjacent-channel interference
by limiting excessive
radiation
at
frequencies
beyond the necessary
bandwidth
.
Attenuation
of these
spurious emissions
is usually done with a
band-pass filter
,
tuned
to allow through the correct center frequency of the
carrier wave
, as well as all necessary
sidebands
.
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