sideband: One of two frequency bands on either side of the carrier wave, containing the modulated signal.
In electronic signal
transmission, a sideband is the portion of a modulated carrier wave that is
either above or below the basic ( baseband ) signal. The portion above the
baseband signal is the upper sideband ; the portion below is the lower sideband
. In regular amplitude modulation ( AM ) transmission, both sidebands are used
to carry a message. In some forms of tranmission, one sideband is removed (
single-sideband transmission ) or a portion of one sideband is removed.
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