Inverse Fourier Transform ignores oscillations
2 ビュー (過去 30 日間)
古いコメントを表示
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.
8 件のコメント
Bjorn Gustavsson
2019 年 10 月 20 日
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).
回答 (0 件)
参考
カテゴリ
Help Center および File Exchange で Fourier Analysis and Filtering についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!