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DSB-SC vs SSB-SC | Difference between DSB-SC and SSB-SC
This page on DSB-SC vs SSB-SC describes difference between DSB-SC and SSB-SC modulation types. It explains basics of DSBSC and SSBSC and mentions useful difference between terms. DSB-SC stands for Double SideBand Suppressed Carrier and SSB-SC stands for Single SideBand Suppressed Carrier.
Both of these are modulation techiques used in AM(Amplitude Modulated) frequency spectrum. As shown in the figure-1 AM spectrum carries Wc(Carrier), Wc-Wm(Lower Side Band) and Wc+Wm(Upper Side Band) signal components.
Fig-1 AM Spectrum
Fig-2 DSBSC Transmitter
●Equations: Carrier: Signal, C(t) = m(t)*cos(Wc*t)
●Information signal: m(t) = Em * co(Wm*t)
●Output of modulator: = Em*cos(Wm*t)*cos(Wc*t)
= (M*Ec/2)*cos(Wc+Wm)t + (M*Ec/2)*cos(Wc-Wm)t
Fig-3 DSBSC Receiver
Information is contained in the first part i.e. (1/2)m(t) which is low pass filtered and extracted.
Here Local Oscillator should have the same frequency and phase as that of the carrier frequency signal used at the transmitter. This process is known as synchronous detection.
DSB-SC - Double SideBand Suppressed Carrier
Fig-4 DSB-SC spectrum
DSBSC modulation technique is used in analogue TV systems to transmit colour information. It is also used for transmitting stereo information in FM sound broadcast at VHF frequencies.
SSB-SC - SideBand Suppressed Carrier
Fig-5 SSB-SC spectrum
SSB filter is used to extract desired sideband for transmission from DSBSC signal. Half of the power is needed for transmission in SSB-SC in comparison to DSBSC.