Consider a fourth-order causal LTI system S whose system function is specified as
(a)Show that a block diagram representation for S consisting of a cascade of four first-order sections will contain multiplications by coefficients that are not purely real.
(b) Draw a block diagram representation for S as a cascade interconnection of two second-order systems, each of which is represented in direct form. There should be no multiplications by nonreal coefficients in the resulting block diagram.
(c) Draw a block diagram representation for S as a parallel interconnection of two second-order systems, each of which is represented in direct form. There should be no multiplications by nonreal coefficients in the resulting block diagram.
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