Phase shift is any change that occurs in the phase of one quantity, or in the phase difference between two or more quantities.
is sometimes referred to as a phase shift or phase offset, because it represents a "shift" from zero phase. But a change in is also referred to as a phase shift.
For infinitely long sinusoids, a change in is the same as a shift in time, such as a time delay. If is delayed (time-shifted) by of its cycle, it becomes:
whose "phase" is now . It has been shifted by radians.
Read more about this topic: Phase (waves)
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