MATLAB: Band Pass Filter Design using FDA tool

bandpass filterfda tool

I need help designing a band pass filter with frequency range 0.34 – 5 Hz using Butterworth. How do I chose the frequency and magnitude specifications?

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You can use the designfilt function.

Another option is How to design a lowpass filter for ocean wave data in Matlab?.

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MATLAB: How to design FIR lowpass filter with cutoff frequency, fc1 = 20 Hz and FIR bandpass filter with cutoff frequency fc2 = 10 Hz and fc3 = 35 Hz.

Déjà vu

how to design IIR highpass filter with cutoff frequency of 20Hz and FIR bandpass filter with cutoff frequency of 10Hz and 15Hz?

Make the appropriate changes to get the cascaded filter you want.

MATLAB: Design band pass filter

Here is prototype code I used for a different project that you can adapt, if you want an IIR filter:

Fs = 250;                                                       % Sampling Frequency
Fn = Fs/2;                                                      % Nyquist Frequency
Ts = 1/Fs;                                                      % Estimate Sampling Interval
t = linspace(0, numel(EKG), numel(EKG))/Fs;
Wp = [2  90]/Fn;                                                % Normalised Passband (Passband =  2 Hz To  90 Hz)
Ws = [1 100]/Fn;                                                % Normalised Stopband (Passband =  1 Hz To 100 Hz)
Rp =  1;                                                        % Passband Ripple/Attenuation
Rs = 50;                                                        % Stopband Ripple/Attenuation
[n,Wp] = ellipord(Wp, Ws, Rp, Rs);                              % Calculate Elliptic Filter Optimum Order
[z,p,k] = ellip(n, Rp, Rs, Wp,'bandpass');                      % Elliptic Filter
[sos,g] = zp2sos(z,p,k);                                        % Convert To Second-Order-Sections For Stability
figure
freqz(sos,2^16,Fs)
filtered_signal = filtfilt(sos,g,signal);

There are a number of FIR designs on Answers as well (I have posted many of them), although I usually reserve those for filters with multiple passbands and stopbands.

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Related Solutions

MATLAB: How to design FIR lowpass filter with cutoff frequency, fc1 = 20 Hz and FIR bandpass filter with cutoff frequency fc2 = 10 Hz and fc3 = 35 Hz.

MATLAB: Design band pass filter

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