Simple FIR Digital Filters A cascade of the simple fir filters 0 2(+) results in an improved lowpass frequency response as illustrated below for a cascade of 3 sections First-order FIR lowpass filter cascade 80: 0.4 0.4 0.6 lI Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 10 Simple FIR Digital Filters • A cascade of the simple FIR filters results in an improved lowpass frequency response as illustrated below for a cascade of 3 sections ( ) ( ) 1 2 1 0 1 − H z = + z 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 w/p Magnitude First-order FIR lowpass filter cascade