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 higher than the carrier frequency are know as upper sidebands; those lower are called lower sidebands. The upper and lower sidebands contain equivalent information; thus only one needs to be transmitted. Such single-sideband signals are very efficient in their use of the frequency spectrum when compared to standard amplitude modulation (AM) signals. See radio.
"sideband." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (June 18, 2019). https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/sideband
"sideband." The Columbia Encyclopedia, 6th ed.. . Retrieved June 18, 2019 from Encyclopedia.com: https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/sideband
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side·band / ˈsīdˌband/ • n. Telecommunications one of two frequency bands on either side of the carrier wave, containing the modulated signal.
"sideband." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (June 18, 2019). https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/sideband
"sideband." The Oxford Pocket Dictionary of Current English. . Retrieved June 18, 2019 from Encyclopedia.com: https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/sideband