what is z transformation and why it is used.
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In mathematics and signal processing, the Z-transform converts a discrete-time 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. The most commonly used and most important property of the z transformation is that the z transform of a signal that is delayed by one sample time is the z transform of the original signal times z-1.
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