Here you find

**fix_fft: FFTs using fixed point arthmetic**
in C, includes test routine

fix_fft.tar.gz
Written by Tom Roberts (1989), improved by Malcolm Slaney (1994),
made portable (ix86 assembly removed) by Dimitrios P. Bouras (2006).

C source for an
**FFT-generator for integer FFTs**
for asm (80x86, 68k and 32k processors) and for C-code.
fftgen.tgz
first read the
fftgen-doc.txt

C++ source (template) for
**complex FFT**
you can supply a class complex (e.g. based on fixed point floats)
with the operators =,+,-,* and this code gives you a FFT for it.
cplxfft.h

**FFTReal: FFTs for real data**

in C++ and Delphi:
http://ldesoras.free.fr/prod.html
by Laurent de Soras.
Delphi port by Frederic Vanmol.

**2dim Hartley transform code**

in C++
mogenet-2dimfht.cc
by Emmanuel Mogenet

**1dim and 2dim DCT (cosine transform) code**

dct.tgz,
here is the doc:
dct-doc.txt

This was from the server that disappeared from the net
(ftp://ftp.crs4.it/mpeg/misc-progs/).
Find a local copy here

C source for Prime Factor Algorithm
**(PFA) FFT**,
convolution, Hankel transform, Hilbert transform, Abel transform
and much more, worth a closer look

cwplib.tgz
first read the
cwplib-doc.txt

A double precision version (with 'reverse engineered' magic constants)
of the pfafft is
here

FORTRAN code for General Prime Factor Algorithm
**(GPFA) FFT**:
1,2,3-dim, by C.Temperton.

gpfa.tgz
first read the
gpfa-doc.txt.
This code really needs a doc, test failed on my machine ...

C code n-dimensional FFTs:
**FFTEASY**:
by Gary Felder and Jiří Janáček:
here.
Local copies of the description (pdf)
and the code ffteasyjj.c

FORTRAN (and f2c'd C) source for
**Glassman's General N FFT**,
length doesn't need to be a power of 2,
degenerates into a DFT for prime lengths.
glassman-fft.f (FORTRAN)
and
glassman-fft.c (C).

Author unknown
(cf. glassman-note.txt),
I received the code from Reginald Beardsley. Thanks to him!

C (and FORTRAN) source for
**n-dim FFT**,
length doesn't need to be a power of 2,
split radix algorithm, test program included,
corrected version of 8-jan-1996:
fft-n.tgz
first read the
fft-n-doc.txt.

C source for
**n-dim FFT**
fftn.tgz
first read the
fftn-doc.txt

Peter Schuck found a typo:
fftnfix.txt

C source for
**2-dim FFT**
modernized and cleaned up by Stefan Gustavson:
first read
kube-gustavson-fft.txt,
then grab
kube-gustavson-fft.c
and
kube-gustavson-fft.h

The old version (as reference, superseded by the above):
code:
kube_fft.c
and mini-doc:
kube_fft-doc.txt

FORTRAN source for (complex and real)
**split radix FFT**
(by Henrik Sorensen):
sorensen.tgz
or
sorensen.shar
first read the
sorensen-doc.txt

C source for
**split radix FFT**
(data length may be not a power of 2).
fftsing.tgz
first read the
fftsing-doc.txt

C source for
**split radix real FFT**
(data length a power of 2)
rsplitfft.c.

FORTRAN source for
**2-dim FFT**
(data length may be not a power of 2).

ten_eyke.f
first read the
ten_eyke-doc.txt.
No further doc available.

C source for real and complex
**FFTs**
not only for data length a power of two
fft2.tgz
first read the
fft2-doc.txt

** FFTW: benchmarks & C code **

FFTW,
the authors claim that it's one of the fastest.

C source by Jens Jørgen Nielsen for
**FFTs**
not only for data length a power of two, see
Mix FFT.

C source for real and complex
**FFTs + sine/cosine transforms + special code for even/odd sequences**
based on Schwartztraubers FORTRAN fftpack (in netlib), see the index below.
Taken from Pekka Janhunen's tela-package
(original site is ftp.funet.fi).
Warning: read tela-bugreport.txt.

The files after some cosmetic changes:
telafft.tgz
(no doc)

Almost original version plus my modification script:
telaffto.tgz (no doc)

The untouched original files from the package:
telafftx.tgz (no doc)

Index of the single prec fortran original:
fftpack.my.index

Get the FORTRAN original (float: fftpack, double: bihar) from
**netlib**.
Netlib is: netlib@XXX where XXX is in europe: nac.no, in USA: ornl.gov
(others exist).
Send an email with subject 'send help'.

Now there is a
www-netlib
site, there see
fftpack
and
vfftpack

More
**FORTRAN code**
(trig/hankel transforms-, convolution-, correlation- and wavelet code in the packages
IMSL, NAG, SCILIB, TOMS and VECLIB) at
http://gams.nist.gov/serve.cgi/Class/J/

FORTRAN source and C source for the
**FFTpack**
from Schwartztrauber:
rfft-1.2-ss-9.01.tgz,
first read the rfft-doc.txt.

- The corresponding chapters in the fxtbook
- Bibliography about FFT papers: fftnote.txt.
- A tutorial about the FFT: fftguru.com.
- A pointer to a book on realtime FFT (from the news net): realtime-fft-book.txt.
- Learn about C++ templates and numbertheoretic transforms: source code and a german (!) thesis: studie.tgz (about 100k). First read the studie-doc.txt.
- About errors in the code in Bracewell's book on the Hartley transform: brace_err.txt.

A
**remark**
on real valued FFTs: realfft.txt

**DSP-links**

**convolution code**:
read
conv.txt
then get the code:
conv-v1.1.tar.gz

Your feedback is appreciated.

jj (Jörg Arndt)

Last modified 2018-May-06 (15:35)

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