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Message: <blockquote data-quote="thch" data-source="post: 1361093" data-attributes="member: 562032">distortion = a signal realted to the desired signal that is not the desired signal.linear distortion = chaning the aplitude or phase or some frequencies in the signal.nonlinear distortion = chanigng the amplitude of the signal based upon the amplitude at a point in time (clipping/compression).  also, anything else that is not simply linear.these are the communications definitions of these things.   THD and IMD are the most suited to the conversation at hand.a square wave, accurately produced, is undistorted.  of course if you wanted a square wave and get a sine wave, well, you've got distortion.</blockquote>

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