freqz_m.m

包含FIR IIR窗函数法

function [db,mag,pha,w]=freqz_m(b,a);
[H,w]=freqz(b,a,1000,'whole');
H=(H(1:501))';
w=(w(1:501))';
mag=abs(H);
db=20*log10((mag+eps)/max(mag));
pha=angle(H);