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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.
The basic idea now known as the Z-transform was known to Laplace, and re-introduced in 1947 by W. Hurewicz as a tractable way to solve linear, constant-coefficient difference equations. It was later dubbed the z-transform by Ragazzini and Zadeh in the sampled-data control group at Columbia University in 1952.he basic idea now known as the Z-transform was known to Laplace, and re-introduced in 1947 by W. Hurewicz as a tractable way to solve linear, constant-coefficient difference equations. It was later dubbed the z-transform by Ragazzini and Zadeh in the sampled-data control group at Columbia University in 1952.