Z-transform

In mathematics and signal processing, the Z-transform converts a discrete time-domain signal, which is a sequence of real or complex numbers, into a complex frequency-domain representation.

It can be considered as a discrete-time equivalent of the Laplace transform. This similarity is explored in the theory of time scale calculus.

Read more about Z-transform:  History, Definition, Inverse Z-transform, Region of Convergence, Properties, Table of Common Z-transform Pairs, Relationship To Laplace Transform, Relationship To Fourier Transform, Linear Constant-coefficient Difference Equation