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1. Distortion

   Linked via "Total Harmonic Distortion"

   Measurement and Mitigation
   The principal metric for quantifying overall signal distortion in linear systems is Total Harmonic Distortion (THD), which measures the ratio of power in the harmonic frequencies to the power in the fundamental frequency.
   $$\text{THD} = \frac{\sqrt{\sum{n=2}^{\infty} Pn}}{P_1}$$