reshaping data using fft and iff
显示 更早的评论
I am carrying out fft on data sample as shown below and padding with zeros, and plot my frequency spectrum which is fine.
y=fft(x,NFFT)/L
when I carry out the inverse as shown below the reconstructed signal is fine except for the fact that the new signal length has increased by the number of zeros I have padded by, where the additional signal is a row of zeros added to the signal.
s=L*ifft(y,NFFT)
How would I use the ifft to reconstruct the signal so that there is no additional zeros added to the signal? As I do not want to simply chop the zeros off.
Many Thanks Anthony
7 个评论
Adam
2015-2-10
Why don't you want to simply chop the zeros off? That is exactly what I do.
Anthony
2015-2-10
Adam
2015-2-10
You need to include the most complex example you want to solve in your question then as I have never found a case yet using the fft where I cannot simply trim off the extra padding from the result.
Anthony
2015-2-10
Adam
2015-2-10
I still don't fully understand what the issue is. Trim the ifft result down to the size of your original signal as the first thing you do after ifft and then do any rescaling or whatever else you want to on a signal-length result.
Anthony
2015-2-10
Adam
2015-2-10
Do you have an example you can include?
回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Fourier Analysis and Filtering 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
