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Transmission in which frequencies produced by amplitude
modulation are symmetrically spaced above and below
the carrier frequency and the carrier level is reduced to the
lowest practical level, ideally completely suppressed.
The wave carrier is not transmitted but a great percentage
of power that is dedicated to it is distributed between the
sidebands, which implies an increase of the cover in DSBSC, compared to AM, for the same power used.
DSB-SC transmission is a special case of Double-sideband
reduced carrier transmission.
This is used for RDS (Radio Data System) because it is
difficult to decouple.
 An amplitude modulation wave without the carrier
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Therefore reducing power wastage, giving it a 100%
efficiency rate.
The increasing compared to normal AM transmission,
which has a maximum efficiency of 50%
Efficeincy,E = (Sideband Power)/(Sideband Power +
Carrier Power).
Spectrum plot of an DSB-SC signal
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Spectrum plot of an DSB-SC signal
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Generated by a mixer that consists of an audio source
combined with the frequency carrier.
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The audio frequency and the carrier frequency must be
exact otherwise get distortion
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This is a message signal that one may wish to modulate
onto a carrier, consisting of a couple of sinusoidal
components.
The equation for this message signal is
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The carrier, in this case, is a plain 5 kHz () sinusoid
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Name "suppressed carrier" comes about because the
carrier signal component is suppressed—it does not appear
(theoretically) in the output signal.
This is apparent when the spectra of the output signal is
viewed: