
In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, containing power as a result of the modulation process. The sidebands consist of all the Fourier components of the modulated signal except the carrier. All forms of modulation produce sidebands. Amplitude modulation of a carrier wave norma...
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http://en.wikipedia.org/wiki/Sideband

1. the spectral components resulting from the modulation of a sinusoidal carrier and lying above or below the carrier frequency 2. a frequency band lying above or below a sinusoidal carrier frequency and containing spectral components of significance produced by modulation
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=702-06-11
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