Designing a discrete signal with cutoff frequencies
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Jonathan George
on 26 Mar 2022
Answered: Star Strider
on 26 Mar 2022
How would I go about designing a 4th order band stop discrete filter that is designed to filter signals sampled at 10Hz and with cutoff frequencies of 2.65Hz and 3.3Hz using the FIR window approach?
Many thanks.
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AndresVar
on 26 Mar 2022
do you have the filter designer app? Introduction to Filter Designer - MATLAB & Simulink Example (mathworks.com)
Accepted Answer
Star Strider
on 26 Mar 2022
Fs = 10; % Sampling Frequency (Hz)
Fn = Fs/2; % Nyquist Frequency
order = 4;
Fp = [2.65 3.3]; % Passband Frequency Vector
h = fir1(order, Fp/Fn, 'bandpass');
figure
freqz(h, 1, 2^16, Fs)
The order is too low for it to actually have a bandpass characteristic. Increasing the order shows it correctly —
Fs = 10; % Sampling Frequency (Hz)
Fn = Fs/2; % Nyquist Frequency
order = 12;
Fp = [2.65 3.3]; % Passband Frequency Vector
h = fir1(order, Fp/Fn, 'bandpass');
figure
freqz(h, 1, 2^16, Fs)
.
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