MATLAB Answers

Remove chattering from signal

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Teo Protoulis
Teo Protoulis on 28 Oct 2019
Answered: Sai Sri Pathuri on 1 Nov 2019
I have the signal shown at the attached image. I want to remove the chattering which I think is high-frequency compared to the signal of interest. So, I think I should use some kind of low pass filter to filter out this chattering. In order to design an optimal filter should I firstly perform a Fourier transform to identify the frequency band of the signal and the frequency band of the noise ? And considering I perform the Fourier transform using Matlab’s fft(X), how do I recognize these frequency bands and then design the appropriate filter ?

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Sai Sri Pathuri
Sai Sri Pathuri on 1 Nov 2019
Refer the following example (Noisy Signal) to find the frequency components of desired signal
The frequencies in the fft spectrum at which the amplitude has peaks gives the frequency band of the signal

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