Hi,
As per my understanding, you want to remove noise from your data using low-pass filter. You can do the same using the 'lowpass()' function in MATLAB. See the code below: -
% Import data from excel and save it as a variable
% Load the saved variable
load('ObservationData.mat');
signal = ObservationData.Value; % signal vector
% Use Fourier transforms to find the frequency components of a signal buried in noise
y = fft(signal);
f = (0:length(y)-1)*50/length(y);
plot(f,abs(y))
% Apply lowpass filter
lowpass(signal,10,1e3)
Output: -
For more information, check out the following documentations: -
