Sideband Modulations Reduction in transmitted power Reduction in Bandwidth (B) Reduction in kTB Sideband modulators are more complex Sideband demodulators can be extremely complex

Alphabet Soup __SB - __C S : Single D : Double V : Vestigial F : Full R : Reduced S : Suppressed (Side Band) (Carrier)

Vestigial Sideband x e(t) (Vestigial Side Band) 1 a(t) cos(  c t) + + VSB Filter cc cc Less Transmitted Bandwidth Most of lower sideband power eliminated Less Carrier Power

VSB Receiver IF Compensation VSB Compensation Filter de- emphasizes the additional low frequency content introduced by the LSB  IF Low Frequency Content in LSB

DSB - SC x e(t) 1 a(t) cos(  c t) + + cc Same Transmitted Bandwidth Zero Carrier Power Generate with Double balanced Mixer (no offset)  c  c Low Pass Filter

MC1596 Analog Multiplier G + G - G + = kS +, and G - = kS - -Vo(+) = (C + - C - )G - + (C - - C + )G + -Vo(-) = (C + - C - )G + + (C - - C + )G - Vo(+) - Vo(-) = -2[(C + - C - )G - + (C - - C + )G + ] =2(C - - C + )(G + - G - ) But C - = - C +, S - = - S + Vo(+) - Vo(-) = 8kS + C +