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Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT
From: |
Martin Braun (CEL) |
Subject: |
Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT |
Date: |
Thu, 17 Oct 2013 16:52:23 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Oct 17, 2013 at 04:44:00PM +0200, Sylvain Munaut wrote:
> > http://img844.imageshack.us/img844/5910/s2i3.png
>
> I'm not convinced by the way you handle the complex part of the FFT result ...
>
> You can't just drop it, it's needed for the reconstruction ...
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.
See:
http://imgur.com/z733PGU
Works fine. If you want do to an ifft(fft(x)), you can't have windows
(feel free to do OS jokes here).
MB
--
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)
Dipl.-Ing. Martin Braun
Research Associate
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Building 05.01
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KIT -- University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association
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- [Discuss-gnuradio] Retrieving audio after FFT and IFFT, Gui Ritter, 2013/10/16
- [Discuss-gnuradio] Retrieving audio after FFT and IFFT, Gui Ritter, 2013/10/16
- Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT, Martin Braun (CEL), 2013/10/17
- Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT, Gui Ritter, 2013/10/17
- Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT, Martin Braun (CEL), 2013/10/17
- Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT, Sylvain Munaut, 2013/10/17
- Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT,
Martin Braun (CEL) <=
- Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT, Marcus D. Leech, 2013/10/17
- Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT, Sylvain Munaut, 2013/10/17
- Re: [Discuss-gnuradio] Retrieving audio after FFT and IFFT, Martin Braun (CEL), 2013/10/17