www.gusucode.com > dsp 案例源码程序 matlab代码 > dsp/DesignALowpassFilterWithiirlpnorExample.m

    %% Design a Lowpass Filter with a Peak of 4.015 dB in Passband
[num,den] = iirlpnorm(5,12,[0 .15 .4 .5 1],[0 .4 .5 1],... 
[1 1.6 1 0 0],[1 1 1 10 10])

%%
% Display the magnitude response in fvtool
fvtool(num,den)