Filter frequencies in matlab's spectrogram

Question

Saravana Kumar R 2016-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/286328-filter-frequencies-in-matlab-s-spectrogram

回答： Star Strider 2016-5-30

I have a huge data from my experiments on which I am performing a short-term fft. For this I use, Matlab's spectrogram. The minimum meaningful frequency that can come out of this analysis is given by Rayleigh frequency (1/window-size).For my analysis I use a window size of 0.05 second. So my meaningful minimum frequency would be 20 Hz.

Now, I'd like to filter 0 to 20 Hz in my spectrogram that matlab produces. How do I do this with spectrogram function?

P.S: I'm a newbie to matlab. So any help from matlab experts would be greatly appreciated.

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Star Strider 2016-5-29

You have to filter before you call spectrogram.

What do you mean by ‘filter 0 to 20 Hz’?

What do you want to do?

Saravana Kumar R 2016-5-30

@star Strider : I want to filter out frequencies from 0 to 20 Hz and do spectrogram for the remaining frequencies. (I do not mean to change the axis minimum or maximum.)

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