want to remove extra data in fft data set

i have a current and diffrentioan dat form of magnetic field. those have some extra unwanted error in them. so by doing fft i wnat to remove them.

[Pooja Kumari]

can you share a small dataset?

Answer 1

[Pooja Kumari]

Hello ambesh,

I think you wanted to remove the extra unwanted error by using fft function.

You can refer to the below code for your reference:

% Assuming you have your current and differential data in vectors
current_data = []; % Your current data
diff_data = [];    % Your differential data

% Perform FFT
current_fft = fft(current_data);
diff_fft = fft(diff_data);

% Determine the frequencies for each bin
n = length(current_data); % Assuming current and diff data are the same length
Fs = 1000; % Your data's sample rate in Hz
freqs = (0:n-1)*(Fs/n);

% Apply filter by setting unwanted frequencies to zero
cutoff_frequency = 50; % I have taken Low-pass filter

% Create a mask for frequencies that are within the desired range
mask = (freqs < cutoff_frequency) | (freqs > (Fs - cutoff_frequency)); % Low-pass filter mask

% Apply the mask to the FFT data by element-wise multiplication
filtered_current_fft = current_fft .* mask;
filtered_diff_fft = diff_fft .* mask;

% Perform the inverse FFT to get the cleaned up signal
cleaned_current_data = real(ifft(filtered_current_fft));
cleaned_diff_data = real(ifft(filtered_diff_fft));

You can refer to the following documentation for more information on fft function:

https://www.mathworks.com/help/matlab/ref/fft.html