>> n=4;Wn=[100,800]/1000;
[b,a] = butter(n,Wn)
b =
0.2754 0 -1.1017 0 1.6525 0 -1.1017 0 0.2754
a =
1.0000 -0.8372 -1.2659 0.6888 1.1537 -0.3715 -0.4512 0.0619 0.0762
过滤问题,我能写,选我
厂