7.1 Linear-phase FIR transfer function ● Since a zero at z=±1 Is its own reciprocal,it can appear only singly e Now a type 2 Fir filter satisfies H()=z-H(2) with degree N-1 odd ● Hence,H(-1)=(-1))H(-1)=-H(-1) implying H(1=0 i.e., H(2)must have a zero at z=-17.1 Linear-phase FIR transfer function