Denoising a signal with FFT

Question

Pau Jordan 2020-7-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/557659-denoising-a-signal-with-fft

回答： Pratyush Roy 2021-2-3

Denoising.m

Hi, I'm new in MATLAB.

Currently I am doing a project related with speech recognition. Now i need to clear the signal i record. I followed this Steve Brunton instructions (https://www.youtube.com/watch?v=c249W6uc7ho) but i can't do it. Can some one tell me what's wrong with my code? I get a strange "PSDclean" plot.

CODE IS CLIPPED

Thanks.

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Answer 1

Pratyush Roy 2021-2-3

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Hi,

The array f stores the audio data obtained as a numeric array in MATLAB. This is not the same as an array containing the frequency values which in this case is freq. So instead of using the command plot(f,ffilt) to plot the clean PSD, you can use the following command

plot(freq(L),PSDclean(L))

Here L denotes the number of samples in the first half of the freq values.

Hope this helps!