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Cutting of sampled signal into two parts

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MAT-Magic
MAT-Magic 2019 年 5 月 7 日
コメント済み: Jingwei Too 2019 年 5 月 8 日
Hi everone,
Actually I have EEG signal (having dimension 1875*22*66 ) which is sampled at 250 Hz. I want to cut it into two parts as from 1 Hz to 125 Hz and 126 Hz to 250 Hz. How to do that?
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Rik
Rik 2019 年 5 月 7 日
This is not really my field of expertise, but once you have a Fourier transform, it shouldn't be too hard to split the signal. You should be able to make a copy of the variable and then setting the parts you don't need to 0.
I guess your main question is if you want to fourier analyze the entire signal of an electrode, or smaller portions separately.

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Jingwei Too
Jingwei Too 2019 年 5 月 7 日
There are several ways to do that:
(1) You can use fast fourier transform (FFT)
(2) You can use short time fourier transform (STFT) to make it too
(3) The best way should be wavelet transform (WT). I will suggest discrete wavelet transform (DWT) which can decompose the signal into approximation and detail coefficients. You can refer paper " 2010 EEG signal classification using PCA, ICA, LDA and support vector machines".
  2 件のコメント
Jingwei Too
Jingwei Too 2019 年 5 月 8 日
I am afraid that i cannot lend you too much assist on CWT since CWT is not my expertise. If you have Matlab wavelet toolbox, you may try to refer the example in help and those might help you for your study.

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