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DSB and SSB-SC

 

Comparison of Double Sideband Suppressed Carrier (DSB-SC) and Double Side Band (DSB)


Similar to amplitude-modulated (AM) signals, double side-band full carrier (DSB-FC) signals transmit both the upper sideband and lower sideband with a carrier signal.

We transmit only the sidebands of the modulated signal when using a double sideband suppressed carrier (DSB-SC) modulation. The carrier signal itself is not transmitted. It is also possible to reconstruct the original message signal using only one sideband—either the upper or lower sideband—in the case of single sideband suppressed carrier (SSB-SC) modulation. In this case, we transmit only the upper sideband or the lower sideband.


Spectrums of Frequencies for DSB-FC and DSB-SC


The AM signal and the DSB-FC signal use the same frequency spectrum. Take a carrier frequency of 100 Hz and a message frequency of 10 Hz, for instance. You also perform modulation using DSB-FC. Then, peak frequencies that are comparable to AM modulation will be at 90 Hz (100 - 10 Hz), 100 Hz, and 110 Hz (100 + 10 Hz).

 



 Figure: Frequency Spectrums of DSB (Lower Sideband, Carrier, and Upper Sideband)


When DSB-SC modulation is used, the carrier frequency is absent from the modulated signal's spectrum. You will find peak magnitude at frequencies like 90 Hz (100 - 10 Hz) and 110 Hz (100 + 10 Hz) for the same example above with a carrier frequency of 100 Hz and a message frequency of 10 Hz. There won't be any carrier frequency in this

 

                 Figure: Frequency Spectrums of DSB-SC (Lower Sideband, and Upper Sideband)


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