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Cleanup documentation for signal.texi, image.texi, audio.texi
author Rik <rdrider0-list@yahoo.com>
date Wed, 01 Apr 2009 17:06:45 -0700
parents eb63fbe60fab
children 757efa1d7e2a
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9071:034800482c79 9072:bd8e388043c4
19 19
20 @node Signal Processing 20 @node Signal Processing
21 @chapter Signal Processing 21 @chapter Signal Processing
22 22
23 23
24 This chapter describes the signal processing and fast fourier 24 This chapter describes the signal processing and fast Fourier
25 transform functions available in Octave. Fast fourier transforms are 25 transform functions available in Octave. Fast Fourier transforms are
26 computed with the @sc{fftw} or @sc{Fftpack} libraries depending on how 26 computed with the @sc{fftw} or @sc{fftpack} libraries depending on how
27 Octave is built. 27 Octave is built.
28 28
29 29
30 30
31 @DOCSTRING(detrend) 31 @DOCSTRING(detrend)
32 32
33 @DOCSTRING(fft) 33 @DOCSTRING(fft)
34 34
35 Octave uses the FFTW libraries to perform FFT computations. When Octave 35 Octave uses the @sc{fftw} libraries to perform FFT computations. When Octave
36 starts up and initializes the FFTW libraries, they read a system wide 36 starts up and initializes the @sc{fftw} libraries, they read a system wide
37 file (on a Unix system, it is typically @file{/etc/fftw/wisdom}) that 37 file (on a Unix system, it is typically @file{/etc/fftw/wisdom}) that
38 contains information useful to speed up FFT computations. This 38 contains information useful to speed up FFT computations. This
39 information is called the @emph{wisdom}. The system-wide file allows 39 information is called the @emph{wisdom}. The system-wide file allows
40 wisdom to be shared between all applications using the FFTW libraries. 40 wisdom to be shared between all applications using the @sc{fftw} libraries.
41 41
42 Use the @code{fftw} function to generate and save wisdom. Using the 42 Use the @code{fftw} function to generate and save wisdom. Using the
43 utilities provided together with the FFTW libraries 43 utilities provided together with the @sc{fftw} libraries
44 (@command{fftw-wisdom} on Unix systems), you can even add wisdom 44 (@command{fftw-wisdom} on Unix systems), you can even add wisdom
45 generated by Octave to the system-wide wisdom file. 45 generated by Octave to the system-wide wisdom file.
46 46
47 @DOCSTRING(fftw) 47 @DOCSTRING(fftw)
48 48