www.gusucode.com > dsp 案例源码程序 matlab代码 > dsp/DesignAButterworthFilterExample.m
%% Design a Butterworth Filter % Construct a default lowpass filter specification object and design a % Butterworth filter. d = fdesign.lowpass; Lowpass = design(d,'butter','matchexactly','stopband'); fvtool(Lowpass); %% % Construct a highpass filter specification object and design a % Butterworth filter. % Specify the order to be 8 and 3 dB frequency to be 0.6*pi % radians/sample. d = fdesign.highpass('N,F3dB',8,.6); Highpass = design(d,'butter'); fvtool(Highpass)