Suppose that three systems are connected in cascade; i.e., the output of is the input to and the output of is the input to . The three systems are specified as follows:
where the output of is yi,[n] and its input is xj[n]
(a) Determine the equivalent system that is a single operation from the input x[n] (into ) to the output y[n], which is the output of . Thus, x[n] is x1[n] and y[n] is y3[n].
(b) Use the frequency response to write one difference equation that defines the overall system in terms of x[n] and y[n] only.
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