VSB

Communications Systems Glossary

Communications Systems — VSB

Information on VSB

Single sideband (SSB) modulation is bandwidth efficient for single channel voice applications because the low frequencies in voice are not required. There are many types of communication, however, such as television, video, facsimile and high-speed data signals that have a large bandwidth incorporating significant low-frequency content. SSB systems have a poor low-frequency response so vestigial-sideband modulation is used, which is derived by filtering double-sideband (DSB) so that one sideband is completely passed and just a trace, or vestige, of the other sideband is included. The bandwidth of vestigial-sideband systems is therefore only slightly larger than that of SSB systems but with the increased low-frequency performance of DSB systems.

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