Definitions for "Phase Distortion"
When the output of an amplifier fluctuates in phase, even though the input does not, the circuit introduces phase distortion into the signal
Changes in desired picture color caused by shifts in chroma phase.
Also called phase shift and sometimes group delay, it results when one part of the frequency spectrum is delayed more than another. Phase shifts can cause test waveforms viewed on an oscilloscope to distort but must be fairly extreme if they are to be audible when listening to music under normal home-playback conditions, at least with loudspeakers.