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

[Marcus D. Leech]

On 10/17/2013 10:52 AM, Martin Braun (CEL) wrote:
> 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
Add "joke" windows to filter blocks:

   o Vista
   o XP
   o 95
   o 3.11
   o Blue-window-of-death

:)



--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org