7.1 Linear-phase FIR transfer function If H z is required to have a linear-phase, its frequency response must be of the form H(el)=Hg(o)e lo Where Ha(o) is called the amplitude response NOTE D Hg(o)is different from H(ejo)l a o(w) is a linear-phase function7.1 Linear-phase FIR transfer function If H(z) is required to have a linear-phase, its frequency response must be of the form ( ) ( ) j j ( ) H e H e g    =  Where Hg(ω) is called the amplitude response. NOTE:  Hg(ω) is different from |H(ejω)|.  Θ(ω) is a linear-phase function