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
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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