ditong.rar_matlab低通滤波_低通滤波

%低通滤波器 Wp=2*pi*300;Ws=2*pi*450;Rp=0.5;Rs=40;fs=1000;W=2*pi*fs; [N,Wn]=buttord(2*Wp/W,2*Ws/W,Rp,Rs); [b,a]=butter(N,Wn); [h,f]=freqz(b,a,1000,fs); figure(2);plot(f,abs(h)); xlabel('f/Hz');ylabel('|H(jf)|'); axis([0 100 0 1.2]);grid on; title('低通滤波器幅频响应');