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Relationship to Fourier transform

Bilateral Z-transform | Unilateral Z-transform | Geophysical definition | Inverse Z-transform | Region of convergence | Examples conclusion | Properties | Relationship to Laplace transform | Zeros and poles | Output response |


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The Z-transform is a generalization of the discrete-time Fourier transform (DTFT). The DTFT can be found by evaluating the Z-transform at (where is the normalized frequency) or, in other words, evaluated on the unit circle. In order to determine the frequency response of the system the Z-transform must be evaluated on the unit circle, meaning that the system's region of convergence must contain the unit circle. Otherwise, the DTFT of the system does not exist.

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