An electronic signal-processing technique in which a spectrum of intelligence is translated from a zero reference frequency to a higher frequency without a change of frequency relationships within the translated spectrum. Single-sideband (SSB) signals have no appreciable carrier. After translation, only the single-sideband energy remains. This form of intelligence transmission requires distortion-free amplification of the SSB signal prior to transmission and occupies only the spectrum bandwidth of that intelligence. These advantages allow SSB to be selected for communication of voice and digital data wherever there is a premium on having a minimum of transmitted power and available frequency spectrum.