Hi.
It's already there. FFT >> transformForward: takes a boolean that specifies 
if the transform is forward or inverse.
Take a look at FFT >> test and run the example in the comment.
Cheers,
Juan Vuletich

----- Original Message ----- 
From: "Cornelius Huber" <corny at impara.de>
To: <squeak-dev at lists.squeakfoundation.org>
Sent: Thursday, April 28, 2005 9:06 AM
Subject: implementation of a IFFT in Squak for a vocoder


>
> Hi,
>
> I am currently working on squeak's audio capabilities. I have tried out 
> some of the recording, playback and synthesis capabilities.
> Right now, I would like to build a vocoder using the FFT.
>
> The first step is to decode both input signals using the FFT and analyzing 
> it's frequency bands. I found that this is somewhat already implemented in 
> the class PhonemeRecognizerMorph.
> Now I need to modulate the second signal with the frequencies from the 
> first signal, using an IFFT.
>
> I am not quite sure how to implement that.
>
> Can anybody help me implementing the code for a IFFT or possibly point to 
> somewhere, where it already might be implemented?
>
>
> Thanks!
> Corny
>
>