Simple linear phase bandpass filter design

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Omid Zobeiri 2017-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/359067-simple-linear-phase-bandpass-filter-design

回答： Nick Choi 2017-10-2

Hi, I tried to make a simple linear phase band pass filter. But the result seems more like a low pass filter. I will be appreciated if you let me know whether I'm in a right path or not. Here is the program:

 % code
fs=20; %sampling rate
f1=0.07;
fc=0.365; %for frequency range of [0.07 0.8] (Hz)
t = -50:50; 
omega = 2*fc/fs_mat; %w0=(2*pi*f)/fs_mat
omega1=2*f1/fs_mat;
a=1;
b = sinc(omega*t).*omega.* hamming(length(t))';
shifted_b=b.*cos(pi*(omega+omega1)*t);
% figure
freqz(shifted_b,a);

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Answer 1

Nick Choi 2017-10-2

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https://ww2.mathworks.cn/matlabcentral/answers/359067-simple-linear-phase-bandpass-filter-design#answer_283969

It may be helpful to use the Filter Designer app for this. You could input your filter specifications, generate the filter's responses and analyze them within the app. Once a suitable filter design has been obtained, you can generate MATLAB code for it and use it in other applications.

The following documentation page provides additional information on how to use the Filter Designer: https://www.mathworks.com/help/dsp/ug/using-filter-designer.html