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Digital Signal Processing. The Z Transform has a strong relationship to the DTFT, and is incredibly useful in transforming, analyzing, and manipulating discrete calculus equations. The Z transform is named such because the letter 'z' (a lower-case Z) is used as the transformation variable.he Z transform is named such because the letter 'z' (a lower-case Z) is used as the transformation variable.
Different from the discrete-time Fourier transform which converts a 1-D signal in time domain to a 1-D complex spectrum in frequency domain, the Z transform converts the 1D signal to a complex function defined over a 2-D complex plane, called z-plane, represented in polar form by radius and angle .