Cutoff Frequency
In
telecommunications
, the term
cutoff frequency
f
c
has the following meanings:
1.
The
frequency
either above which or below which the
output
of a
circuit
, such as a
line
, amplifier, or
filter
, is reduced to the specified level of - 3dB = 70.7% of the reference voltage level of 0dB = 100%. See also
time constant
and
center frequency
. The calculation of the
center frequency
of such a frequency band is not the
arithmetic mean
but the
geometric mean
. See external link.
http://www.sengpielaudio.com/calculator-geommean.htm
A level drop of - 3dB means a voltage reduction to 70,7 % and also a power reduction to 50%, because
V
2
is proportional to
P
.
2.
The frequency below which a
radio wave
fails to penetrate a
layer
of the
ionosphere
at the incidence angle required for
transmission
between two specified points by
reflection
from the layer. A
bandpass
has two cutoff frequencies and a
center frequency
.
See also:
low-pass filter
and
high-pass filter
.
External link
Calculation of the center frequency with geometric mean and comparison to the arithmetic solution
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