[SOLVED] FFT & IFFT with different lengths

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emicho

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Signal is a 160 samples
and I am obligated to apply a 512 FFT
is there any way that I could restore my signal
with a 160 IFFT

X=FFT(signal,512)
x=IFFT(X,160)

x == signal !?!?

how can I make this relation possible
any Idea guys?!
please help
 

When you perform FFT of 512 points, the signal must have exactly 512 values, If it has less, it must be zero-padded. Apparently the FFT function you are using does this automatically (Matlab does).
Then, if you perform IFFF of that, you get the data on which FFT was applied (i.e. zero-padded signal), whose 160 first samples are the original signal.
Regards

Z
 
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