2.4 Construction of signal flow graphs o A signal flow graph is a graphical representation of a set of algebraic relationship and it is a directed graph. The arrow represents the relationship between variables. In general, a variable can be represented by a node Example: A typical feedback system. (In this case, a dummy node and a branch are added because the output node c has all outgoing branch)2.4 Construction of signal flow graphs ¨ A signal flow graph is a graphical representation of a set of algebraic relationship, and it is a directed graph. The arrow represents the relationship between variables. In general, a variable can be represented by a node. ¨ Example: A typical feedback system. (In this case, a dummy node and a branch are added because the output node C has all outgoing branch)