Hanning Window 10%

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Katharina Paul 2022-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/1628855-hanning-window-10

编辑： David Goodmanson 2022-2-17

Dear all,

I am trying to reproduce a previously described analysis and I struggle with one part of it: It says

"data epochs were subjected to a Hanning window (10%)"

While I know that I can create a Hanning window of the desired length via hann(), I am not sure what I should do about the 10%. Do you have an idea?

Thank you very much!

Best

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Srija Kethiri 2022-2-17

Hii Katharina,

Can you please share your script files so that we can help you better.

David Goodmanson 2022-2-17

编辑：David Goodmanson 2022-2-17

Hi Katharina,

could you explain what the task is, such as power spectral density, or something else? If it is PSD or something like it, then the general approach is to use the same window in overlapping intervals across the data. Suppose the data has 10000 points and suppose the window length is 10% of rhe data length (just a guess, a la Bjorn). If the window overlap was 50% which is fairly common, then you would multiply the window.*data(1:1000), then window.* data(501:1500), then window.*data(1001:2000) etc. Then you would separately fourier transform each of those 19 cases and take an average of, in the case of PSD, abs(fourier trans).^2 (I am skipping some details involving normalization). That's just one possibility for what might be meant.

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