A causal LTI system is defined by the signal flow graph shown in Figure P6.25, which represents the system as a cascade of a 2nd-order system with a 1st-order system.
(a) What is the system function of the overall cascade system?
(b) Is the overall system stable? Explain briefly.
(c) Is the overall system a minimum-phase system? Explain briefly.
(d) Draw the signal flow graph of a transposed direct form II implementation of this system.