<s>
In	O
sound	O
recording	O
and	O
reproduction	O
,	O
ground	B-Protocol
lift	I-Protocol
or	O
earth	B-Protocol
lift	I-Protocol
is	O
a	O
technique	O
used	O
to	O
reduce	O
or	O
eliminate	O
ground-related	O
noise	O
arising	O
from	O
ground	O
loops	O
in	O
audio	O
cables	O
.	O
</s>
<s>
Activating	O
the	O
ground	B-Protocol
lift	I-Protocol
on	O
a	O
particular	O
piece	O
of	O
equipment	O
opens	O
the	O
connection	O
between	O
the	O
equipment	O
ground	O
and	O
the	O
shielding	O
conductor	O
of	O
audio	O
cables	O
attached	O
to	O
the	O
equipment	O
,	O
leaving	O
those	O
cables	O
grounded	O
only	O
at	O
their	O
opposite	O
end	O
.	O
</s>
<s>
Professional	O
audio	O
equipment	O
intended	O
for	O
use	O
with	O
balanced	O
lines	O
may	O
have	O
a	O
ground	B-Protocol
lift	I-Protocol
switch	O
for	O
the	O
cable	O
shield	O
.	O
</s>
<s>
The	O
ground	B-Protocol
lift	I-Protocol
switch	O
eliminates	O
unwanted	O
hum	O
and	O
buzz	O
by	O
interrupting	O
the	O
ground	O
loops	O
between	O
equipment	O
,	O
preventing	O
current	O
flow	O
along	O
the	O
cable	O
shield	O
between	O
two	O
devices	O
.	O
</s>
<s>
The	O
switch	O
disconnects	O
pin	O
1	O
on	O
the	O
XLR	B-Device
jack	O
,	O
which	O
is	O
connected	O
to	O
the	O
braid	O
or	O
foil	O
shield	O
in	O
the	O
cable	O
and	O
acts	O
as	O
the	O
ground	O
point	O
of	O
the	O
circuit	O
.	O
</s>
<s>
Ground	B-Protocol
lifts	I-Protocol
do	O
not	O
conform	O
to	O
Audio	O
Engineering	O
Society	O
standard	O
AES48	O
.	O
</s>
