Double-sideband reduced carrier transmission

Double-sideband reduced carrier transmission (DSB-RC): Transmission in which (a) the frequencies produced by amplitude modulation are symmetrically spaced above and below the carrier and (b) the carrier level[?] is reduced for transmission at a fixed level below that which is provided to the modulator.

Note: In DSB-RC transmission, the carrier is usually transmitted at a level suitable for use as a reference by the receiver, except for the case in which it is reduced to the minimum practical level, i.e. , the carrier is suppressed.

Source: from Federal Standard 1037C