<s>
In	O
electronics	O
,	O
signal	O
processing	O
,	O
and	O
video	O
,	O
ringing	B-Algorithm
is	O
oscillation	B-Algorithm
of	O
a	O
signal	O
,	O
particularly	O
in	O
the	O
step	B-Algorithm
response	I-Algorithm
(	O
the	O
response	O
to	O
a	O
sudden	O
change	O
in	O
input	O
)	O
.	O
</s>
<s>
Often	O
ringing	B-Algorithm
is	O
undesirable	O
,	O
but	O
not	O
always	O
,	O
as	O
in	O
the	O
case	O
of	O
resonant	B-Architecture
inductive	I-Architecture
coupling	I-Architecture
.	O
</s>
<s>
It	O
is	O
closely	O
related	O
to	O
overshoot	B-Algorithm
,	O
often	O
instigated	O
as	O
damping	O
response	O
following	O
overshoot	B-Algorithm
or	O
undershoot	B-Algorithm
,	O
and	O
thus	O
the	O
terms	O
are	O
at	O
times	O
conflated	O
.	O
</s>
<s>
In	O
electrical	O
circuits	O
,	O
ringing	B-Algorithm
is	O
an	O
unwanted	O
oscillation	B-Algorithm
of	O
a	O
voltage	O
or	O
current	O
.	O
</s>
<s>
those	O
that	O
are	O
not	O
part	O
of	O
the	O
design	O
,	O
but	O
just	O
by-products	O
of	O
the	O
materials	O
used	O
to	O
construct	O
the	O
circuit	O
)	O
to	O
resonate	B-Application
at	O
their	O
characteristic	O
frequency	O
.	O
</s>
<s>
Ringing	B-Algorithm
artifacts	I-Algorithm
are	O
also	O
present	O
in	O
square	O
waves	O
;	O
see	O
Gibbs	O
phenomenon	O
.	O
</s>
<s>
Ringing	B-Algorithm
is	O
undesirable	O
because	O
it	O
causes	O
extra	O
current	O
to	O
flow	O
,	O
thereby	O
wasting	O
energy	O
and	O
causing	O
extra	O
heating	O
of	O
the	O
components	O
;	O
it	O
can	O
cause	O
unwanted	O
electromagnetic	O
radiation	O
to	O
be	O
emitted	O
;	O
it	O
can	O
delay	O
arrival	O
at	O
a	O
desired	O
final	O
state	O
(	O
increase	O
settling	B-Algorithm
time	I-Algorithm
)	O
;	O
and	O
it	O
may	O
cause	O
unwanted	O
triggering	O
of	O
bistable	O
elements	O
in	O
digital	O
circuits	O
.	O
</s>
<s>
Ringing	B-Algorithm
can	O
be	O
due	O
to	O
signal	O
reflection	O
,	O
in	O
which	O
case	O
it	O
may	O
be	O
minimized	O
by	O
impedance	O
matching	O
.	O
</s>
<s>
In	O
video	O
circuits	O
,	O
electrical	O
ringing	B-Algorithm
causes	O
closely	O
spaced	O
repeated	O
ghosts	O
of	O
a	O
vertical	O
or	O
diagonal	O
edge	O
where	O
dark	O
changes	O
to	O
light	O
or	O
vice	O
versa	O
,	O
going	O
from	O
left	O
to	O
right	O
.	O
</s>
<s>
In	O
a	O
CRT	B-Device
the	O
electron	O
beam	O
upon	O
changing	O
from	O
dark	O
to	O
light	O
or	O
vice	O
versa	O
instead	O
of	O
changing	O
quickly	O
to	O
the	O
desired	O
intensity	O
and	O
staying	O
there	O
,	O
overshoots	B-Algorithm
and	O
undershoots	B-Algorithm
a	O
few	O
times	O
.	O
</s>
<s>
Ringing	B-Algorithm
can	O
affect	O
audio	O
equipment	O
in	O
a	O
number	O
of	O
ways	O
.	O
</s>
<s>
Audio	O
amplifiers	O
can	O
produce	O
ringing	B-Algorithm
depending	O
on	O
their	O
design	O
,	O
although	O
the	O
transients	O
that	O
can	O
produce	O
such	O
ringing	B-Algorithm
rarely	O
occur	O
in	O
audio	O
signals	O
.	O
</s>
<s>
Transducers	O
(	O
i.e.	O
,	O
microphones	B-Application
and	O
loudspeakers	O
)	O
can	O
also	O
ring	O
.	O
</s>
<s>
Mechanical	O
ringing	B-Algorithm
is	O
more	O
of	O
a	O
problem	O
with	O
loudspeakers	O
as	O
the	O
moving	O
masses	O
are	O
larger	O
and	O
less	O
easily	O
damped	O
,	O
but	O
unless	O
extreme	O
they	O
are	O
difficult	O
to	O
audibly	O
identify	O
.	O
</s>
<s>
In	O
digital	O
audio	O
,	O
ringing	B-Algorithm
can	O
occur	O
as	O
a	O
result	O
of	O
filters	O
such	O
as	O
brickwall	O
filters	O
.	O
</s>
<s>
Here	O
,	O
the	O
ringing	B-Algorithm
occurs	O
before	O
the	O
transient	O
as	O
well	O
as	O
after	O
.	O
</s>
<s>
In	O
signal	O
processing	O
,	O
"	O
ringing	B-Algorithm
"	O
may	O
refer	O
to	O
ringing	B-Algorithm
artifacts	I-Algorithm
:	O
spurious	O
signals	O
near	O
sharp	O
transitions	O
.	O
</s>
