<s>
In	O
radio	B-Application
frequency	I-Application
engineering	I-Application
,	O
an	O
overlap	B-Protocol
zone	I-Protocol
occurs	O
where	O
signals	O
from	O
two	O
or	O
more	O
radio	O
stations	O
,	O
transmitting	O
at	O
the	O
same	O
frequency	O
,	O
can	O
be	O
received	O
with	O
comparable	O
intensity	O
.	O
</s>
<s>
Alternatively	O
,	O
the	O
signals	O
could	O
be	O
separated	O
using	O
a	O
demodulator	O
in	O
single	B-Device
sideband	I-Device
mode	I-Device
.	O
</s>
<s>
With	O
digital	O
radio	O
(	O
Digital	O
Radio	O
Mondiale	O
and	O
Digital	O
Audio	O
Broadcasting	O
being	O
two	O
common	O
types	O
)	O
,	O
there	O
is	O
no	O
interference	O
in	O
the	O
overlap	B-Protocol
zone	I-Protocol
.	O
</s>
