2.3 Signal flow graphs Fundamental of signal flow graphs A simple signal flow graph can be used to represent an algebraic relation It is the relationship between node i to node with the transmission function A, (it is also represented by a branch) A.·X (2-8 Node A Node X Branch2.3 Signal flow graphs ¨ Fundamental of signal flow graphs A simple signal flow graph can be used to represent an algebraic relation It is the relationship between node i to node with the transmission function A, (it is also represented by a branch). X i A ij X j   (2-8)