Answer Posted / rajesh

SSBSC modulation saves bandwidth because in the standard AM
wave carrier causes wastage. With SSBSC we transmit one side
band because the other side band is just a replica of
this.But, for Picture transmission which involves
significant low frequency components, SSB fails to create a
clear distinction of the side bands. One side band
transmitted often leaves out low frequency content which is
not negligible for picture transmission. In order to
overcome this, a vestige ( a trace ) of the other side band
close to the carrier frequency is transmitted in addition to
one of the side bands.

Hence, VSB is used for picture transmission

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