Inverse Fourier Transform ignores oscillations

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Steven 2019-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/486178-inverse-fourier-transform-ignores-oscillations

编辑： Steven 2019-10-22

Hi. I am doing some time and freq analysis. So lets say I have some x-t data, I use fft to take them in freq domain, do some calculations and finally do ifft to return them back into the time domain. But after getting the ifft, I get the red plot, while the blue plot is obtained from another source (which appranely should be true).

I am not sure which one is correct? How come the ifft is ignoring the oscilaltions?

Thanks in advance.

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Walter Roberson 2019-10-20

fftshift() to convert fft representations.

Bjorn Gustavsson 2019-10-20

Based on your question and comments it is clear (this will come off as a bit abrasive) that you should read up on what you do when Fourier-transforming data and what happens with the Fourier-transform when you do operations on it (what multiplication in the Fourier-domain corresponds to in the time-domain etc).

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