7.1 Linear-phase FIR transfer function o Type 4 FIR Transfer Function The impulse response of a Type1 FiR filter is of even length that is, the degree n is odd and satisfies the antisymmetry condition its amplitude response Hg(o) is given by H()=∑2h(n)silo(m-o)7.1 Linear-phase FIR transfer function  Type 4 FIR Transfer Function The impulse response of a Type1 FIR filter is of even length, that is, the degree N is odd and satisfies the antisymmetry condition. Its amplitude response Hg(ω) is given by ( ) ( ) ( ) 0 2 sin M g n H h n n    = = −     