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@c Copyright (C) 1996-2025 The Octave Project Developers
@c
@c This file is part of Octave.
@c
@c Octave is free software: you can redistribute it and/or modify it
@c under the terms of the GNU General Public License as published by
@c the Free Software Foundation, either version 3 of the License, or
@c (at your option) any later version.
@c
@c Octave is distributed in the hope that it will be useful, but
@c WITHOUT ANY WARRANTY; without even the implied warranty of
@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
@c GNU General Public License for more details.
@c
@c You should have received a copy of the GNU General Public License
@c along with Octave; see the file COPYING. If not, see
@c <https://www.gnu.org/licenses/>.
@node Signal Processing
@chapter Signal Processing
This chapter describes the signal processing and fast Fourier
transform functions available in Octave. Fast Fourier transforms are
computed with the @sc{fftw} or @sc{fftpack} libraries depending on how
Octave is built.
@DOCSTRING(fft)
@DOCSTRING(ifft)
@DOCSTRING(fft2)
@DOCSTRING(ifft2)
@DOCSTRING(fftn)
@DOCSTRING(ifftn)
Octave uses the @sc{fftw} libraries to perform FFT computations. When Octave
starts up and initializes the @sc{fftw} libraries, they read a system wide
file (on a Unix system, it is typically @file{/etc/fftw/wisdom}) that
contains information useful to speed up FFT computations. This
information is called the @emph{wisdom}. The system-wide file allows
wisdom to be shared between all applications using the @sc{fftw} libraries.
Use the @code{fftw} function to generate and save wisdom. Using the
utilities provided together with the @sc{fftw} libraries
(@command{fftw-wisdom} on Unix systems), you can even add wisdom
generated by Octave to the system-wide wisdom file.
@DOCSTRING(fftw)
@DOCSTRING(fftconv)
@DOCSTRING(fftfilt)
@DOCSTRING(filter)
@DOCSTRING(filter2)
@DOCSTRING(freqz)
@DOCSTRING(freqz_plot)
@DOCSTRING(sinc)
@DOCSTRING(unwrap)
@c FIXME: someone needs to organize these ...
@DOCSTRING(arch_fit)
@DOCSTRING(arch_rnd)
@DOCSTRING(arch_test)
@DOCSTRING(arma_rnd)
@DOCSTRING(autoreg_matrix)
@DOCSTRING(bartlett)
@DOCSTRING(blackman)
@DOCSTRING(detrend)
@DOCSTRING(diffpara)
@DOCSTRING(durbinlevinson)
@DOCSTRING(fftshift)
@DOCSTRING(ifftshift)
@DOCSTRING(fractdiff)
@DOCSTRING(hamming)
@DOCSTRING(hanning)
@DOCSTRING(hurst)
@DOCSTRING(pchip)
@DOCSTRING(periodogram)
@DOCSTRING(sinetone)
@DOCSTRING(sinewave)
@DOCSTRING(spectral_adf)
@DOCSTRING(spectral_xdf)
@DOCSTRING(spencer)
@DOCSTRING(stft)
@DOCSTRING(synthesis)
@DOCSTRING(yulewalker)
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