Figure shows the block diagram of Weaver’s method for generating
Figure shows the block diagram of Weaverâs method for generating SSB modulated waves. The message (modulating) signal m (t) is limited to the band A?a < |=”” a?=”” |=””>< a?b.=”” the=”” auxiliary=”” carrier=”” applied=”” to=”” the=”” first=”” pair=”” of=”” product=”” modulators=”” has=”” a=”” frequency=”” a?0,=”” which=”” lies=”” at=”” the=”” center=”” of=”” this=”” band,=”” as=”” shown=”” by=”” a?0=”A?a” +=”” a?b/2.=”” the=”” low-pass=”” filters=”” in=”” the=”” in-phase=”” and=”” quadrature=”” channels=”” are=”” identical,=”” each=”” with=”” a=”” cutoff=”” frequency=”” equal=”” to=”” (a?b=”” â=”” a?a)/2.=”” the=”” carrier=”” applied=”” to=”” the=”” second=”” pair=”” of=”” product=”” modulators=”” has=”” a=”” frequency=”” a?c=”” that=”” is=”” grater=”” than=”” (a?b=”” â=”” a?a)/2.=”” sketch=”” the=”” spectra=”” at=”” the=”” carious=”” points=”” in=”” the=”” modulators=”” of=”” figure,=”” and=”” hence=”” show=””>
(a) For the lower sideband, the contribution of the in-phase and quadrature channels are of the same polarity, and by adding them at the modular output, the lower sideband is suppressed.
(b) For the upper sideband, the contribution of the in-phase and quadrature channels are of the same polarity, and by adding them at the modular output, the upper sideband is suppressed
(c) How would you modify the modulator of Figure so that only the lower sideband istransmitted?
