<s>
Double-sideband	B-Device
reduced	I-Device
carrier	I-Device
transmission	I-Device
(	O
DSB-RC	O
)	O
:	O
transmission	O
in	O
which	O
(	O
a	O
)	O
the	O
frequencies	O
produced	O
by	O
amplitude	B-Device
modulation	I-Device
are	O
symmetrically	O
spaced	O
above	O
and	O
below	O
the	O
carrier	O
and	O
(	O
b	O
)	O
the	O
carrier	O
level	O
is	O
reduced	O
for	O
transmission	O
at	O
a	O
fixed	O
level	O
below	O
that	O
which	O
is	O
provided	O
to	O
the	O
modulator	B-Application
.	O
</s>
