Signals and Systems

5.5 BASIC DEFINITION OF SIGNAL FLOW GRAPH (SFG)

The definition of the following terminology used in SFG is given below:

• Input or Source Node

  The node having only outgoing branches is called input or source node.

  In Fig. 5.7, x₁ is the input or source node.

   

  

   

  Fig. 5.7 Signal Flow Graph

   

• Sink Node

  The node having only incoming branches is called sink node or output node. In Fig. 5.7, x₉ is the sink or output node.

   

• Chain Node

  The node having both incoming and outgoing branches is know as chain node. In Fig. 5.7, x₂, x₃, x₄,x₅, x₆, x₇ and x₈ are all chain nodes.

   

• Forward Path:

  A path from input to output is known as forward path.

  In Fig. ...