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DSB-SC is basically an amplitude modulation wave without the carrier, therefore reducing power waste, giving it a 50% efficiency. This is an increase compared to normal AM transmission (DSB) that has a maximum efficiency of 33.333%, since 2/3 of the power is in the carrier which conveys no useful information and both sidebands containing identical copies of the same information.
Double-sideband reduced carrier transmission (DSB-RC): transmission in which (a) the frequencies produced by amplitude modulation are symmetrically spaced above and below the carrier and (b) the carrier level is reduced for transmission at a fixed level below that which is provided to the modulator. Note: In DSB-RC transmission, the carrier is ...
In the Armstrong method, the audio signal and the radio frequency carrier signal are applied to the balanced modulator to generate a double sideband suppressed carrier signal. The phase of this output signal is then shifted 90 degrees with respect to the original carrier. The balanced modulator output can either lead or lag the carrier's phase.
The term DSB reduced-carrier normally implies enough carrier remains in the transmission to enable a receiver circuit to regenerate a strong carrier or at least synchronise a phase-locked loop but there are forms where the carrier is removed completely, producing double sideband with suppressed carrier (DSB-SC). Suppressed carrier systems ...
The reason is that FCC has been made to believe that a reliable DSB-SC demodulator cannot be made cost-effective. About 40 years ago, during my MS studies, I liked to prove, once for all, that by using twice the SSB-SC bandwidth helps the DSC-SC demodulator be much simpler and more practical than of SSB-SC.
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Also, the figure isn't DSB-SC, where the output goes to zero when either the carrier or input goes to zero. That is, a four quadrant multiplier. And DSC-SC is often used with the modulation frequency close to the carrier frequency, specifically with the almost 19kHz audio and 38kHz subcarrier for FM stereo.
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