Definition of terms phase epoch & phase difference
Answers
Phase epoch is the initial phase of a vibrating particle at time,t = 0.
Phase difference is the difference, expressed in degrees or radians, between two waves having the same frequency and referenced to the same point in time.
Phase is the position of a point in time (an instant) on a waveform cycle.
An epoch can also mean the beginning of a new and important period of history, or an event that marks such a period: an epoch in the world of ballet. The noun epoch is from New Latin epocha, from Greek epochē "pause, check, fixed time.
hence phase epoch is the phase at beginning i.e when t=0 ...
In sinusoidal functions or in waves, "phase" has two different, but closely related, meanings. One is the initial angle of a sinusoidal function at its origin and is sometimes called phase offset or phase difference.