--- In "kurmannthomas" <> wrote:
>
> Hello
> Im using FFTW3 to transform 9(3 Sensors 3 Axis) arrays with real
> (double) data to frequency spectrum. The arrays all have the same
> length so im only planning one plan using:
>
> p = fftw_plan_dft_r2c_1d(N,in,out,FFTW_FORWARD)
> and then executing on all 9 arrays (the data in in just gets
> swapped). The results seem to be correct (verified with Matlab which
> also uses FFTW3). Now the problem is im getting a conversion time for
> a 4096 point FFT of about 4 seconds...this is horribly slow...even
> without EABI or Crunch i would have expected the TS-7260 is alot
> faster. Now i am not experienced enough with Linux to "install" EABI
> or Crunch (unless someone has a tar that i can just extract ;)) Now i
You need a EABI or Crunch enabled kernel, so in order to use a tar
package, you should use bootloader to boot the kernel. You will
probably end being an experienced user after this, because you'll need
to build a couple of things.
I recommend you build a kernel with FastFPE point,this is not ANSI,
but is supposed to be much faster than the standard.
> am searching for a integer FFT which should be alot faster...Has
> anyone else seen these extremly slow times when using FFTW3? Maybe im
> doing something wrong?
>
> Im going to check with another floating point FFT next week to see if
> its an FFTW3 problem, or really the TS-7260. My goal is to be able to
> calculate (up to) 9 FFTs with (up to) 16384 points in less than 1 or
> 2 seconds...a DSP would have no problem with this...
>
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