Re: [NEWBIE] what's the relationship between the units of data before and after FFT?

From: lucy (losemind_at_yahoo.com)
Date: 08/17/04 

Date: Tue, 17 Aug 2004 15:51:07 -0700

"Randy Yates" <randy.yates@sonyericsson.com> wrote in message
news:xxpzn4tz8z2.fsf@usrts005.corpusers.net...
> "lucy" <losemind@yahoo.com> writes:
> > then how much "cycle per m" is one grid in the 301x301 grids after FFT2?
>
> If you have N^2 2D datum that are input to the 2D FFT, then the spacing
> between "bins" in the FFT output is Fs/N, where Fs is the sample rate.
> --
> Randy Yates
> Sony Ericsson Mobile Communications
> Research Triangle Park, NC, USA
> randy.yates@sonyericsson.com, 919-472-1124

Hi Randy, thanks a lot,

How about the inverse transform? suppose I already have a frequency function
sampled into N^2 2D grids,

the spacing after IFFT will be what?

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