Sideband
Sideband :
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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