86.1 Introduction Here the input-output relation involves a finite sum of products: yn]=-∑k=14kyn-+∑k20Pkxn- On the other hand, an FiR system can be implemented using the convolution sum e which is a finite sum of products y小]=∑0b1m-k1• Here the input-output relation involves a finite sum of products:  =  = = − − + − M k k N k k y n d y n k p x n k 1 0 [ ] [ ] [ ]  = = − N k y n h k x n k 0 [ ] [ ] [ ] §6.1 Introduction • On the other hand, an FIR system can be implemented using the convolution sum which is a finite sum of products: