Instantaneous phase and frequency

Instantaneous phase and instantaneous frequency are concepts primarily used in the analysis of signals, particularly in the context of time-varying signals in fields like signal processing, communications, and wave analysis. ### Instantaneous Phase - **Definition**: The instantaneous phase of a signal refers to the phase of the signal at any given point in time. It can be derived from the complex representation of a signal, typically expressed in terms of sine or cosine functions.