6.1 z-TRANSFORM
X(z) denotes the z-transform of discrete time signal x(n) and it is given by
where z is the complex variable and the z-transform of x(n) is also represented by the operator Z i.e.,
X(z) = Z[x(n)]
In equation (6.2) X(z) and x(n) are known as z-transform pair which is represented as
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