Filtering out the noise in the observations by applying a low pass filter

Question

Ali Saremi 2021-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/746582-filtering-out-the-noise-in-the-observations-by-applying-a-low-pass-filter

评论： Ali Saremi ，2021-2-22

Hi,

I need to filter out the nosie in my observation data. Based on my understanding, I should use Low Pass Filter function. I was wondering if someone could help me with this?

I have attached the excel file as well.

Thank you and I look forward to hearing from you.

Kind regards,

Ali

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Answer 1

Abhishek Gupta 2021-2-19

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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)