Linear-Phase fr 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. e, of order N H()=∑20小n=n 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 ( ) [ ]