Linear-Phase FIR Transfer Functions It is nearly impossible to design a linear- phase iir transfer function It is al ways possible to design an Fir transfer function with an exact linear-phase response Consider a causal Fir transfer function H(z) of length n+1. 1. e. of order w N 0 Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 1 Linear-Phase FIR Transfer Functions • It is nearly impossible to design a linear￾phase IIR transfer function • It is always possible to design an FIR transfer function with an exact linear-phase response • Consider a causal FIR transfer function H(z) of length N+1, i.e., of order N:  = − = N n n H z h n z 0 ( ) [ ]