<s>
A	O
Jecklin	B-Algorithm
disk	I-Algorithm
is	O
a	O
sound-absorbing	O
disk	O
placed	O
between	O
two	O
microphones	B-Application
to	O
create	O
an	O
acoustic	O
"	O
shadow	O
"	O
from	O
one	O
microphone	B-Application
to	O
the	O
other	O
.	O
</s>
<s>
A	O
matching	O
pair	O
of	O
small-diaphragm	O
omnidirectional	O
microphones	B-Application
is	O
generally	O
used	O
for	O
this	O
technique	O
.	O
</s>
<s>
In	O
the	O
beginning	O
Jecklin	O
used	O
omnidirectional	O
microphones	B-Application
on	O
either	O
side	O
of	O
a	O
30cm	O
(	O
1ft	O
.	O
)	O
</s>
<s>
The	O
capsules	O
of	O
the	O
microphones	B-Application
were	O
above	O
the	O
surface	O
of	O
the	O
disc	O
,	O
just	O
in	O
the	O
center	O
,	O
16.5	O
centimeters	O
(	O
6½	O
"	O
)	O
apart	O
from	O
each	O
other	O
and	O
each	O
pointing	O
20	O
degrees	O
outside	O
.	O
</s>
<s>
Jecklin	O
found	O
the	O
16.5cm	O
(	O
6½	O
"	O
)	O
ear	O
spacing	O
between	O
the	O
microphones	B-Application
too	O
narrow	O
.	O
</s>
<s>
In	O
his	O
own	O
paper	O
,	O
he	O
notes	O
that	O
the	O
disk	O
has	O
to	O
be	O
35cm	O
(	O
13¾	O
"	O
)	O
in	O
diameter	O
and	O
the	O
distance	O
between	O
the	O
microphones	B-Application
should	O
be	O
36	O
cm	O
(	O
14	O
3/16	O
"	O
)	O
.	O
</s>
<s>
The	O
Jecklin	B-Algorithm
disk	I-Algorithm
is	O
a	O
refinement	O
of	O
the	O
baffled	O
microphone	B-Application
technique	O
for	O
stereo	O
initially	O
described	O
by	O
Alan	O
Blumlein	O
in	O
his	O
1931	O
patent	O
on	O
binaural	O
sound	O
.	O
</s>
<s>
But	O
what	O
stands	O
out	O
to	O
an	O
even	O
greater	O
degree	O
,	O
is	O
the	O
greatly	O
enlarged	O
microphone	B-Application
spacing	O
–	O
rather	O
than	O
formerly	O
16.5cm	O
as	O
a	O
human	O
"	O
head	O
diameter	O
"	O
(	O
ear	O
distance	O
)	O
there	O
is	O
now	O
a	O
distance	O
of	O
36cm	O
(	O
double-headed	O
?	O
)	O
.	O
</s>
<s>
Translated	O
:	O
Two	O
omnidirectional	O
microphones	B-Application
are	O
placed	O
with	O
a	O
distance	O
between	O
them	O
of	O
36cm	O
(	O
14	O
3/16	O
"	O
)	O
,	O
and	O
acoustically	O
separated	O
by	O
a	O
foam-covered	O
disk	O
having	O
a	O
diameter	O
of	O
35cm	O
(	O
13¾	O
"	O
)	O
.	O
</s>
<s>
That	O
shows	O
a	O
great	O
difference	O
to	O
the	O
initial	O
smaller	O
Jecklin	B-Algorithm
Disk	I-Algorithm
of	O
30	O
centimeters	O
diameter	O
and	O
the	O
distance	O
between	O
the	O
microphones	B-Application
of	O
16.5	O
centimeters	O
.	O
</s>
