Phase (waves)
Phase in sinusoidal functions or in waves 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. Another usage is the fraction of the wave cycle which has elapsed relative to the origin.
Read more about Phase (waves): Formula, Phase Shift, Phase Difference, In-phase and Quadrature (I&Q) Components, Phase Coherence, Phase Compensation
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