Sideband

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...
Found on http://en.wikipedia.org/wiki/Sideband

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
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=702-06-11

sideband

sideband, any frequency component of a modulated carrier wave other than the frequency of the carrier wave itself, i.e., any frequency added to the carrier as a result of modulation; sidebands carry the actual information while the carrier contributes none at all. Those frequency components that are...
Found on http://www.infoplease.com/ce6/sci/A0845129.html
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