The range of the electromagnetic spectrum located either above (the upper sideband) or below (the lower sideband) the frequency of a sinusoidal carrier signal c(t). The sidebands are produced by modulating the carrier signal in amplitude, frequency, or phase in accordance with a modulating signal m(t) to produce the modulated signal s(t). The resulting distribution of power in the sidebands of the modulated signal depends on the modulating signal and the particular form of modulation employed.