Mercurial > octave-nkf
view doc/interpreter/signal.txi @ 18846:492c56149535 stable rc-3-8-2-1
3.8.2 release candidate 1
* configure.ac (OCTAVE_VERSION): Bump to 3.8.2-rc1.
(OCTAVE_MINOR_VERSION): Bump to 2-rc1.
(OCTAVE_RELEASE_DATE): Set to 2014-06-06.
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 06 Jun 2014 11:43:17 -0400 |
parents | d63878346099 |
children | 446c46af4b42 |
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@c Copyright (C) 1996-2013 John W. Eaton @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 the @c Free Software Foundation; either version 3 of the License, or (at @c your option) any later version. @c @c Octave is distributed in the hope that it will be useful, but WITHOUT @c ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or @c FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License @c 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 <http://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)