This is the Linux app named StFFT whose latest release can be downloaded as StFFT.zip. It can be run online in the free hosting provider OnWorks for workstations.
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StFFT
DESCRIPTION:
Fast fourier transform algorithm written on IEC-61131-3 Structured text programming language for programmable logic controllers.Algorithm is split-radix FFT. StFFT is iterative contrary to more common recursive approach. Iterative solution was chosen because PLCs don't have support for recursion. For compatibility with as many as possible PLC models, algorithm have dependency only on sine and cosine functions.
Dual licenced under LGPL and Commercial licence. For commercial licencing contact tamitech@tamitech.fi
Author
Jaakko Pasanen
This is an application that can also be fetched from https://sourceforge.net/projects/stfft/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.