All branches of the signal flow graphs in this problem have unity gain unless specifical...

All branches of the signal flow graphs in this problem have unity gain unless specifically indicated otherwise.

(a) The signal flow graph of System A, shown in Figure P6.43-1, represents a causal LTI system. Is it possible to implement the same input–output relationship using fewer delays? If it is possible, what is the minimum number of delays required to implement an equivalent system? If it is not possible, explain why not.

(b) Does the System B shown in Figure P6.43-2 represent the same input–output relationship as System A in Figure P6.43-1? Explain clearly.