Help designing very low pass filters (sub-mHz) for long time series
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Hi Darcy,
I do highly appreciate your recent comment. Instead of appreciating my contribution towards resolving your problem, you basically insulted me. However, I would like to express my knowledge by sharing an example code with you to further enhance your knowledge about functions mentioned above by providing my code snippet.
>> % Designing a custom low-pass filter for low-frequency signals fs = 1000; % Sampling frequency fc = 100; % Cutoff frequency for low-pass filter order = 4; % Filter order
% Design the filter using 'fdesign' function d = fdesign.lowpass('N,F3dB', order, fc, fs); Hd = design(d, 'butter');
% Visualize the frequency response of the designed filter freqz(Hd); title('Frequency Response of Low-Pass Filter for Low-Frequency Signals');
Please see attached plot along with code snippet.
![](/matlabcentral/answers/uploaded_files/1730301/IMG_7017.png)
![](/matlabcentral/answers/uploaded_files/1730296/IMG_7018.jpeg)
The purpose of this code snippet is to showcase the process of designing a custom low-pass filter in MATLAB for attenuating high-frequency components in signals, particularly suited for low-frequency applications. By setting the sampling frequency, cutoff frequency, and filter order, the code tailors the filter characteristics to meet specific signal processing requirements.
The visualization of the frequency response using freqz aids in understanding how the designed filter affects different frequency components. It will allows you to analyze the filter's behavior, such as passband ripple, stopband attenuation, and phase response, crucial for signal processing tasks.
Please let me know if you need further assistance or help.
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