7.1 Linear-phase fIr transfer function Proof H(e)=∑h(n)em=∑h(m) cos on-j∑h(n) )sin on Ifh(n)is a real sequence, we have ∑h(n) sinan B(o)=arg tan-N-l ∑h(n) coson7.1 Linear-phase FIR transfer function