Translations:Dictionary:Distortion/7/en

(e) Phase distortion results when phase shift is not linear with frequency over the bandpass or where it is linear but where the zero frequency intercept is not a multiple of $\pi$. Where the intercept is a multiple of n$\pi$, the waveshape is not changed in n is even and is inverted if n is odd, although the entire waveform may be delayed. See linear-phase filter.