sideband


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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
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; 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.
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.

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

sidebandclick for a larger image
sidebandclick for a larger image
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.

sideband

In 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.
References in periodicals archive ?
Sideband -- a professional laptop ensemble based in New York -- turns each member of its ensemble into an island of sound, returning a sense of acoustics and space to the normally flat world of electronic music.
The sideband had been used to give credit courses, extension programs and services for the blind, but its funding ran out.
The final test result is an averaged modulation index, which represents the normalized strength of the sideband signals in db.
Lamb maintains that the separation in frequency between each of the new sidebands and its neighboring QPO is too great for it to represent frame dragging.
The sideband power and total power is calculated and presented for each value of modulation index.
Initial frequency error, jitter, sideband noise and vibration errors tend to drop all the way through, corrupting the user's measurement.
CHICAGO, March 10, 2011 /PRNewswire/ -- Developed by inventor Xu Yongyong and represented by ICAP Ocean Tomo, the technology of this portfolio utilizes client computing resources through a sideband communication channel.
To assist in applications that require special sideband system management features, ExpressCard host systems may also connect a two-wire SMBus interface to the slot.
The new version boasts greater robustness of data in payload-event-queues, a modification of thread-busy signaling API, added support for interrupts, sideband error signaling, sideband user flags, added TLM2-native adapters between TL3 and TL1, and added TLM2-native adapters between TL1 and RTL signals (TL0).
3GHz frequency bands, breaking new ground in power consumption, sideband suppression, carrier leakage and dynamic range performance.
Appoints SideBand Systems as its first North American fiber-thru-the-air reseller
A sideband channel signal, AUX_HPD, carries the sideband channel signals of the DisplayPort standard, namely the AUX CH differential pair (AUX CH+ and AUX CH-) and HPD over a single pin.