www.gusucode.com > signal 案例源码程序 matlab代码 > signal/ChirpPowerSpectralDensitiesExample.m
%% Bandpass Chebyshev Type I Filter % Design a 20th-order Chebyshev Type I bandpass filter with a lower passband % frequency of 500 Hz and a higher passband frequency of 560 Hz. Specify a passband % ripple of 3 dB and a sample rate of 1500 Hz. Use the state-space % representation. Design an identical filter using |designfilt|. % Copyright 2015 The MathWorks, Inc. %% [A,B,C,D] = cheby1(10,3,[500 560]/750); d = designfilt('bandpassiir','FilterOrder',20, ... 'PassbandFrequency1',500,'PassbandFrequency2',560, ... 'PassbandRipple',3,'SampleRate',1500); %% % Convert the state-space representation to second-order sections. % Visualize the frequency responses using |fvtool|. sos = ss2sos(A,B,C,D); fvt = fvtool(sos,d,'Fs',1500); legend(fvt,'cheby1','designfilt')