6. 1 Block Diagram Representation of Linear Constant-Coefficient Difference equations yIn=ayln-+bor n+xiN Three basic elements: Unit Delay Memory, storage) In/12 xin M sample Delay z-Mm17 a Multiplier axin Adder xin+x2n9 6.1 Block Diagram Representation of Linear Constant-Coefficient Difference Equations + x1 [n] x2 [n] x1 [n] + x2 Adder [n] x[n] a Multiplier ax[n] x[n] x[n-1] z Unit Delay −1 (Memory, storage) y n ay n b x n b x n   = − + + −  1 1  0 1     Three basic elements: M sample Delay z -M x[n-M]