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Fast Fourier Transforms
Contains Fast Fourier Transform source code (C, C++, Pascal), tutorial, and math theory.
FFT Page
Links and various Fortran FFT implementations.
FFT Links
Links to many sources of FFT code and information.
Jens J. Nielsen's Home Page
Arbitrary length FFT C-source, 3D gravity simulator, quantization of FIR filter coefficients. C source.
A Short Demonstration Version of the FFT Source Code in Fortran
Source Code in Fortran for FFT from "Programs for Digital Signal Processing", 1979, IEEE Press, ISBN 0-87942-127-4. The book is necessary to use and understand these source code listings.
fftpack
A package of Fortran subprograms for the fast Fourier transform of periodic and other symmetric sequences.
The ARC Parallel FFT Homepage
Parallel implementations of the Fast Fourier Transform at the High Performance Computing and Education Research Center (HPCERC).
FFTW
Fast free C FFT library; includes multi-dimensional, real-complex, and parallel transforms.
Row-oriented Multidimensional Fast Transform Library (RMFTL)
Power-of-two real and complex FFT software that is faster, and more accurate, than conventional iterative implementation of one-dimensional FFTs. Based on a propietary algorithm.
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