In mathematics and signal
processing, the Ztransform converts a discrete timedomain signal, which is a sequence of real or complex
numbers, into a complex frequencydomain representation. It is like a discrete equivalent of the Laplace
transform. This similarity is explored in the theory of time scale calculus. The Ztransform was introduced, under
this name, by Ragazzini and Zadeh in 1952. The modified or advanced Ztransform was later developed by E. I. Jury,
and presented in his book SampledData Control Systems (John Wiley & Sons 1958). The idea contained within the
Ztransform was previously known as the "generating function method".
 Wikipedia
Signal 

zTransform 

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(convolution) 


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