lower sideband


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lower sideband

[′lō·ər ′sīd‚band]
(communications)
The sideband containing all frequencies below the carrier-frequency value that are produced by an amplitude-modulation process.
References in periodicals archive ?
From Equation 13, if the bandwidth of the signal processing circuits is not wide enough, the resulting amplitude difference between upper and lower sidebands at the mixer input can produce a DC shift at the mixer output.
The lower sideband (LSB) demodulation module in the receiver extracts the lateral sideband (shifted by 488 Hz) made by the marking process and then transposes it to the low modulation frequency signal of 488 Hz.
In a similar manner, it can be shown that, if the phases of the I and Q signals are reversed, then the upper sideband would be produced at the output, while the lower sideband and carrier are now suppressed.
The sideband suppression is 44 dBc for the lower sideband or 43 dBc for the upper sideband in the lower display where Q leads I by 90 [degrees].
Since the phase shifter functionally is the same as a SSB modulator, Figure 4 shows the carrier down 33 dB and the suppressed lower sideband down 30 dB.
The swept frequency response of either the upper or lower sideband from the mixer's RF port then is measured, using the spectrum analyzer, as shown in Figure 6.