PHASE PERTURBATION

Any shifting (often quite rapid), from whatever cause, in the phase of a signal . ( 188 ) Note 1: The shifting in phase may appear to be random, cyclic, or both. Note 2: The phase departure in phase perturbation usually is larger, but less rapid, than that of phase jitter . Note 3: Phase perturbation may be expressed in degrees, with any cyclic component expressed in hertz .