www.gusucode.com > signal 案例源码程序 matlab代码 > signal/GenerateIIRFilterWithDirectFormIStructureExample.m
%% Generate IIR Filter with Direct Form I Structure % Design a 30th-order IIR Butterworth filter. Specify a cutoff frequency of % _π_/4 rad/sample. Create a Simulink(R) block with a direct form I % structure. [b,a] = butter(30,0.25); filt2block(b,a,'FilterStructure','directForm1')