Undesired frequencies in close proximity to desired ones,such as a difference frequency appearing within the baseband,are difficult if not impossible to identify and remove after they have been created.What does this occurrence represent?
A)Modulation envelope
B)Pure sine-wave intelligence
C)Foldover distortion
D)Modulating signal frequency

Question

Quizplus · Accepted Answer

This occurrence represents foldover distortion, which is caused by aliasing when the sampling frequency is not high enough to accurately represent the original analog signal. Undesired frequencies can then appear within the baseband and be difficult to identify and remove.

Undesired Frequencies in Close Proximity to Desired Ones,such as a Difference