<s>
The	O
RCA	B-Algorithm
Type	I-Algorithm
77-DX	I-Algorithm
microphone	I-Algorithm
is	O
a	O
poly-directional	O
ribbon	B-Algorithm
microphone	I-Algorithm
,	O
or	O
pressure-gradient	O
microphone	O
,	O
introduced	O
by	O
the	O
RCA	O
Corporation	O
in	O
1954	O
.	O
</s>
<s>
A	O
common	O
solution	O
to	O
this	O
problem	O
has	O
been	O
to	O
attach	O
a	O
pencil	B-Device
vertically	O
across	O
the	O
front	O
of	O
the	O
microphone	O
.	O
</s>
<s>
The	O
pencil	B-Device
deflects	O
a	O
vocalist	O
's	O
breath	O
as	O
it	O
reaches	O
the	O
microphone	O
,	O
and	O
prevents	O
it	O
from	O
hitting	O
the	O
ribbon	O
directly	O
.	O
</s>
