<s>
The	O
transition	B-Algorithm
band	I-Algorithm
,	O
also	O
called	O
the	O
skirt	B-Algorithm
,	O
is	O
a	O
range	O
of	O
frequencies	O
that	O
allows	O
a	O
transition	O
between	O
a	O
passband	B-Algorithm
and	O
a	O
stopband	O
of	O
a	O
signal	O
processing	O
filter	O
.	O
</s>
<s>
The	O
transition	B-Algorithm
band	I-Algorithm
is	O
defined	O
by	O
a	O
passband	B-Algorithm
and	O
a	O
stopband	O
cutoff	O
frequency	O
or	O
corner	O
frequency	O
.	O
</s>
<s>
An	O
example	O
of	O
this	O
can	O
be	O
taken	O
from	O
a	O
low-pass	B-Algorithm
filter	I-Algorithm
,	O
commonly	O
used	O
in	O
audio	O
systems	O
to	O
allow	O
the	O
bass	O
signal	O
to	O
pass	O
through	O
to	O
a	O
subwoofer	B-Application
,	O
and	O
cut	O
out	O
all	O
unwanted	O
frequencies	O
above	O
a	O
defined	O
point	O
.	O
</s>
<s>
The	O
transition	B-Algorithm
band	I-Algorithm
can	O
be	O
implemented	O
to	O
allow	O
for	O
a	O
smooth	O
fall	O
off	O
to	O
avoid	O
introducing	O
audible	O
peaks	O
in	O
amplitude	O
.	O
</s>
<s>
If	O
the	O
transition	B-Algorithm
band	I-Algorithm
of	O
the	O
example	O
200Hz	O
filter	O
is	O
20Hz	O
,	O
then	O
the	O
signal	O
should	O
start	O
attenuating	O
at	O
180Hz	O
,	O
and	O
finally	O
blocked	O
at	O
200Hz	O
.	O
</s>
<s>
The	O
curve	O
that	O
the	O
transition	B-Algorithm
band	I-Algorithm
follows	O
depends	O
on	O
the	O
engineering	O
of	O
the	O
filter	O
,	O
including	O
component	O
reaction	O
time	O
and	O
the	O
choice	O
of	O
values	O
for	O
the	O
components	O
that	O
comprise	O
the	O
filter	O
according	O
to	O
mathematical	O
formula	O
.	O
</s>
<s>
The	O
transition	B-Algorithm
band	I-Algorithm
is	O
usually	O
apparent	O
in	O
any	O
filter	O
system	O
,	O
even	O
if	O
it	O
is	O
unwanted	O
.	O
</s>
<s>
This	O
is	O
due	O
to	O
the	O
fact	O
that	O
roll-off	B-Algorithm
is	O
higher	O
for	O
a	O
filter	O
of	O
higher	O
order	O
.	O
</s>
