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Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT

From: Sylvain Munaut
Subject: Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT
Date: Thu, 17 Oct 2013 17:17:45 +0200


> You're right, but in this case the input was already real and the
> "channel" doesn't modify the phase. So it's OK--the 'correct' thing
> would be to do a real FFT.

Huh ?

To make sure I actually ran a quick python test before posting :

In [13]: ifft([x.real for x in fft([1,2,3,4])])
Out[13]: array([ 1.+0.j,  3.+0.j,  3.+0.j,  3.+0.j])

As you can see the output of the ifft ( [1,3,3,3] isn't the same as
the fft input [1,2,3,4] ) ...



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