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1. Distortion

   Linked via "roll-off"

   Frequency Distortion (Frequency Response Irregularity)
   Frequency distortion occurs when different frequency components of a signal are attenuated or amplified unequally by the system. This results in a change in the relative spectral content of the signal. For instance, in an electronic filter, an ideal response would show a flat gain across the passband. Real-world sy…