| 释义 |
sideband
side·band also side band S0387800 (sīd′bănd′)n. Either of the two bands of frequencies, one just above and one just below a carrier frequency, that result from modulation of a carrier wave.sideband (ˈsaɪdˌbænd) n (General Physics) the frequency band either above (upper sideband) or below (lower sideband) the carrier frequency, within which fall the spectral components produced by modulation of a carrier wave. See also single sideband transmissionsideband
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 modulationmodulation,
in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information-bearing signal wave (the modulating wave); demodulation is the process by which the original signal is recovered from the wave
..... Click the link for more information. ; 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 radioradio,
transmission or reception of electromagnetic radiation in the radio frequency range. The term is commonly applied also to the equipment used, especially to the radio receiver.
..... Click the link for more information. .sideband[′sīd‚band] (electromagnetism) The frequency band located either above or below the carrier frequency, within which fall the frequency components of the wave produced by the process of modulation. The wave components lying within such bands. sideband  A range of frequencies occupied by the spectral components resulting from the modulation of a carrier wave by a signal. The frequency of the upper sideband is the sum of the carrier frequency and the audio frequencies used to modulate the carrier, whereas the lower sideband is the difference between the carrier frequency and the audio frequencies used to modulate the carrier.sidebandIn radio communications, a signal that results from amplitude modulating a carrier frequency. The upper sideband is the carrier plus modulation, and the lower sideband is the carrier minus modulation, which are mirror images of each other. See single sideband. |