SSB: In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation  SSB-SC is a type of modulation used to transmit information, such as an audio signal, by radio waves. A refinement of amplitude modulation uses transmitter power and bandwidth more efficiently. It is only one sideband AM, without a carrier. Bandwidth is FM. More number of channels in a given frequency range. Difficult reconstruction.

DSB: Double-sideband suppressed-carrier transmission DSB-SC is transmission in which frequencies produced by amplitude modulation (AM) are symmetrically spaced above and below the carrier frequency and the carrier level is reduced to the lowest practical level, ideally being completely suppressed. It is a double sideband without carrier AM. Bandwidth is 2 FM. Less number of channels in a given frequency range. Moderately difficult reconstruction.