www.gusucode.com > signal 案例源码程序 matlab代码 > signal/AnalogAndDigitalButterworthFiltersExample.m
%% Analog and Digital Butterworth Filters % Convert a sixth-order analog Butterworth lowpass filter to a digital % filter using impulse invariance. Specify a sample rate of 10 Hz and a % cutoff frequency of 2 Hz. Display the frequency response of the filter. %% f = 2; fs = 10; [b,a] = butter(6,2*pi*f,'s'); [bz,az] = impinvar(b,a,fs); freqz(bz,az,1024,fs)