sidebands
Modulation's spectral byproducts
Sidebands are frequencies produced above and below a carrier wave when a signal is modulated—the result of combining two frequencies in radio transmission.
The carrier frequency sits in the center; sidebands carry the actual information.
In single-sideband transmission, one sideband is filtered out to save bandwidth: amateur radio operators often use single sideband.
The term extends figuratively to secondary effects or implications accompanying a main signal or message.
Sending of information
- broadcastingMass signal transmission
- transceiverDual-function communication device
- transmitterSignal-emitting device
- receiverOne who accepts transmission
shortwave · USB · bandwidth · interference · splatter · filtering · selectivity · mixer
Data transmission capacity
- attenuationGradual intensity reduction
- rolloffGradual reduction in level
- spuriousFalse though appearing genuine
- distortionTwisting from original state
One that transports
- amplitudeMaximum oscillation displacement
- frequencyRate of recurrence
- phaseDistinct period in sequence
- upperShoe part above sole
lower · envelope · baseband · demodulation · overmodulation · quadrature
Rapid oscillating movement
- resonanceAmplified oscillation at natural frequency
- DopplerMotion-caused frequency change
- nonlinearityDisproportionate cause and effect
- harmonicsFrequencies above the fundamental
sonar · ultrasound · flutter · wow
transmission
Sending of information
- broadcastingMass signal transmission
- transceiverDual-function communication device
- transmitterSignal-emitting device
receiver · shortwave · USB · bandwidth · interference · splatter · filtering · selectivity · mixer
bandwidth
Data transmission capacity
- attenuationGradual intensity reduction
- rolloffGradual reduction in level
- spuriousFalse though appearing genuine
carrier
One that transports
- amplitudeMaximum oscillation displacement
- frequencyRate of recurrence
- phaseDistinct period in sequence
upper · lower · envelope · baseband · demodulation · overmodulation · quadrature
vibration
Rapid oscillating movement
- resonanceAmplified oscillation at natural frequency
- DopplerMotion-caused frequency change
- nonlinearityDisproportionate cause and effect
harmonics · sonar · ultrasound · flutter · wow