| a type of linear distortion occurring when the amplitude/frequency characteristic of a transmission channel or two-port device deviates from the ideal form in the useful frequency band
NOTE 1 – The ideal form of the amplitude/frequency characteristic is a straight line of constant ordinate.
NOTE 2 – In some fields such as line transmission "distorsion d'affaiblissement" in French and "attenuation/frequency distortion" in English are the preferred terms.
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