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Re: why does invert fft not work?

From: Jordi Gutiérrez Hermoso
Subject: Re: why does invert fft not work?
Date: Wed, 24 Nov 2010 21:27:04 -0600

On 24 November 2010 20:26,  <address@hidden> wrote:

> for example:
> s=sqrt(2)*cos(2*pi()*[1:1000]/1000);
> sn=s+.001*sqrt(1000/2)*randn(1,1000);
> b=sqrt(2)*fft(sn)/1000;
> invoking
> snew=ifft(b);
> does NOT reproduce sn or s in any way shape or form!

Well, you're not doing ifft(fft(sn)), so I don't see why you expect
that to be sn, and sn and s are completely unrelated. I'm confused
what the goal is.n

- Jordi G. H.

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