Wikipedia
In signal processing, phase distortion or phase-frequency distortion is distortion, that is, change in the shape of the waveform, that occurs when (a) a filter's phase response is not linear over the frequency range of interest, that is, the phase shift introduced by a circuit or device is not directly proportional to frequency, or (b) the zero-frequency intercept of the phase-frequency characteristic is not 0 or an integral multiple of 2π radians.
Usage examples of "phase distortion".
The result is: if a hypertransition spacewarp takes place anywhere within a radius of 10 light-years, the phase distortion triggers automatic controls here, switching the field output to maximum, which is about 10 billion kilowatts.
But for some reason she also got a phase distortion that she had to cancel, and that released spiking glitches previously suppressed, and to get rid of the glitches she had to run three other programs.