Bandpass filtering One method of producing an SSB signal is to remove one of the sidebands via filtering, leaving only either the upper sideband (USB), the sideband with the higher frequency, or less commonly the lower sideband (LSB), the sideband with the lower frequency. Most often, the carrier is reduced or removed entirely (suppressed), being referred to in full as single sideband suppressed carrier (SSBSC). Assuming both sidebands are symmetric, which is the case for a normal AM signal, no information is lost in the process. Since the final RF amplification is now concentrated in a single sideband, the effective power output is greater than in normal AM (the carrier and redundant sideband account for well over half of the power output of an AM transmitter). Though SSB uses substantially less bandwidth and power, it cannot be demodulated by a simple envelope detector like standard AM.
baNdPAss filTerINg one MeThod Of produCiNg an ssB signaL is to RemOve onE oF THe sidebANdS VIa Filtering, leAviNg onLy eiTHeR thE upPER sIDeband (UsB), The sIdEband WitH thE HigHer freQUEnCY, Or LeSS CommoNLy the LoweR SIdeBanD (lsb), the siDeband wiTH the lOweR frequeNcy. most ofTen, the carriEr is reDuced Or RemoVed eNtirELy (SupPrESseD), Being reFErreD tO in fUll As sInGle SIdEband SuPprEssed CaRrIer (ssBsc). AssuMinG both SidEbaNds aRe symmEtric, which is the caSe fOr a noRmAl am sIGnAl, no information Is loSt IN The procESs. siNce tHe fInal rf amPlIficatIOn iS now concEnTratED in a sinGle sideBand, THe efFecTiVE powEr output iS grEAter THan in noRmal am (tHe carrier anD redundant SideBanD aCCounT fOr Well Over HAlf of the PoWer ouTput oF an aM trAnsMitteR). tHOugh SsB USes SuBsTAntiAlly leSS bandwidtH and power, it caNNot be demoDUlatEd by a sImPle EnVElope detecTOr Like stAndard am.