Single sideband, SSB, modulation is used in many voice applications. It is used for HF communications, but forms have been used for analogue TV broadcasting. Single sideband modulation is widely used in the HF portion, or short wave portion of the radio spectrum for two way radio communication.

Why is sideband needed?

In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, that are the result of the modulation process. The sidebands carry the information transmitted by the radio signal. The sidebands comprise all the spectral components of the modulated signal except the carrier.

What is the use of 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, it uses transmitter power and bandwidth more efficiently.