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

    %% Design an IIR Filter
% This example shows the two ways of designing an IIR Filter

%%
% Design the filter using |fdesign| and |design|. 
D = fdesign.comb('notch','N,BW',8,0.02);
H = design(D,'systemobject',true)
fvtool(H);

%% 
% Design the filter using filter coefficients.
b = [0.9 zeros(9,1)' -0.9];
a = [1 zeros(9,1)' -0.8];
H = dsp.IIRFilter('Numerator',b,'Denominator',a)
fvtool(H);