12.6 DESCRIBING EQUATION
The linear time invariant (LTI) systems can be represented by the following general difference equation:
The z-transform Eq. (12.26) gives
The system function H(z) is in the rational form which is expressed as the ratio of two polynomials in z –1. It is possible to represent the discrete time system with the help of delay elements, multipliers and adders as elementary blocks. Table 12.3 gives a brief summary of these elements.
Table 12.3 Summary of elementary blocks used to represent discrete time systems ...
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