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Discussion Groups | Analog Devices DSPs | AW: Inverse FFT of real signals

Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).

  

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AW: Inverse FFT of real signals - Bernhard Holzmayer - Sep 15 13:39:00 2004



> -----Ursprüngliche Nachricht-----
> Von: soundbyfabrizio [SMTP:]
> Gesendet am: Mittwoch, 15. September 2004 11:29
> An:
> Betreff: [adsp] Inverse FFT of real signals > Hi all,
>
> I saw the ADSP-21062_Real_FFT_rad-2.zip for a real FFT implementation
> on a 21062 processor.
> I didn't find anything about the inverse FFT algorithm.
>
> In the complex implementation (ADSP-21062_Compl_FFT_rad-2.zip) there
> are some hints to make the inverse transform.
>
> Thanks,
>
> Fabrizio real_signal = const. * FFT ( FFT ( real_signal) )

There is your inverse transform.

This should work for real as for complex signals.
Real and imag transforms work independently, so that you can even use
one complex transform to transform two real signals at the same time.

Bernhard




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