Difference Equation in LTI DT Systems | Signals and Systems | SNS Institutions

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A difference equation is a mathematical expression that relates the input, output and past values of an output signal in a Linear Time-Invariant (LTI) discrete-time system. It is the discrete-time equivalent of a differential equation in continuous-time systems. Difference equations are widely used to describe digital filters, recursive systems and DSP algorithms. It is used in Speech and audio processing, Control systems, Communication systems, Biomedical signal filters and Predictive models.