<s>
Independent	B-Device
sideband	I-Device
(	O
ISB	O
)	O
is	O
an	O
AM	B-Device
single	B-Device
sideband	I-Device
mode	O
which	O
is	O
used	O
with	O
some	O
AM	B-Device
radio	O
transmissions	O
.	O
</s>
<s>
Normally	O
each	O
sideband	O
carries	O
identical	O
information	O
,	O
but	O
ISB	O
modulates	B-Application
two	O
different	O
input	O
signals	O
one	O
on	O
the	O
upper	O
sideband	O
,	O
the	O
other	O
on	O
the	O
lower	O
sideband	O
.	O
</s>
<s>
This	O
is	O
used	O
in	O
some	O
kinds	O
of	O
AM	B-Device
stereo	O
(	O
sometimes	O
known	O
as	O
the	O
Kahn	O
system	O
)	O
.	O
</s>
<s>
ISB	O
is	O
a	O
compromise	O
between	O
double	O
sideband	O
(	O
DSB	O
)	O
and	O
single	B-Device
sideband	I-Device
(	O
SSB	O
)	O
the	O
other	O
is	O
vestigial	O
sideband	O
(	O
VSB	O
)	O
.	O
</s>
<s>
If	O
the	O
sidebands	O
are	O
out	O
of	O
phase	O
with	O
each	O
other	O
,	O
then	O
phase	B-Device
modulation	I-Device
(	O
PM	O
)	O
of	O
the	O
carrier	O
occurs	O
.	O
</s>
<s>
AM	B-Device
and	O
PM	O
together	O
then	O
create	O
quadrature	B-Device
amplitude	I-Device
modulation	I-Device
(	O
QAM	B-Device
)	O
.	O
</s>
<s>
ISB	O
may	O
or	O
may	O
not	O
have	O
the	O
carrier	B-Device
suppressed	I-Device
.	O
</s>
<s>
Suppressed-carrier	O
ISB	O
was	O
employed	O
in	O
point-to-point	B-Architecture
(	O
usually	O
overseas	O
)	O
radiotelephony	O
and	O
radioteletype	O
by	O
shortwave	O
(	O
HF	B-Algorithm
)	O
.	O
</s>
<s>
In	O
military	O
use	O
,	O
ISB	O
usually	O
referred	O
to	O
a	O
close	O
pair	O
of	O
FSK	O
radioteletype	O
channels	O
which	O
could	O
be	O
demodulated	B-Device
by	O
a	O
single	O
receiver	O
,	O
and	O
employed	O
in	O
fleet	O
broadcast	O
,	O
point-to-point	B-Architecture
,	O
and	O
between	O
larger	O
vessels	O
and	O
shore	O
stations	O
on	O
HF	B-Algorithm
and	O
UHF	O
.	O
</s>
