A method of transmission of radiowaves in which the carrier component of the modulated wave is not transmitted. One or both of the sidebands only are transmitted. Suppressed-carrier transmission is used in single-sideband transmission and double-sideband transmission. It requires a local oscillator at the receiver that regenerates the carrier frequency and mixes it with the received signal in order to detect the modulating wave. This method of detection is termed synchronous detection.