Consider the discrete-time system depicted in Figure P6.40-1.
(a) Write the set of difference equations represented by the flow graph of Figure P6.40-1.
(b) Determine the system function H1(z) = Y1(z)/X (z) of the system in Figure P6.40-1, and determine the magnitudes and angles of the poles of H1(z) as a function of r for −1 < r < 1.
(c) Figure P6.40-2 shows a different flow graph obtained from the flow graph of Figure P6.40-1 by moving the delay elements to the opposite top branch. How is the system function H2(z) = Y2(z)/X (z) related to H1(z)?
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