where b n and a n are the coefficients of the filter. We have assumed without loss of generality that a 0 =1. The order of such an IIR filter is called N if a N _=0.The difference equation representation of an IIR filter is expressed as
where b n and a n are the coefficients of the filter. We have assumed without loss of generality that a 0 =1. The order of such an IIR filter is called N if a N _=0.The difference equation representation of an IIR filter is expressed as