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Signal_gaussien.png(610 × 461 pixels, file size: 4 KB, MIME type: image/png)

Summary Edit

Signal avec un bruit gaussien ; moyenne m = 5, écart type σ = 1



Signal with a gaussian noise; average m = 5, standard deviation σ = 1

Auteur/author : Christophe Dang Ngoc Chan (cdang)

réalisé avec/made with Scilab

clear;clf;
n=50; // moitié du nombre de points aléatoires

// Gaussienne normée *3 centrée sur 5, écart type 1 

deff('[y]=gauss(x)','y=3/(2*%pi)*exp(-0.5*(x-5)^2)')

// nombres aléatoires, loi uniforme

x1=rand(n,1);
x2=rand(n,1);
x=[2:0.1:8]';

// méthode de Box-Muller
// on peut aussi faire directement
// y1=rand(2*n,1,'normal')

for i=1:n
   y1(i)=sqrt(-2*log(x1(i)))*cos(2*%pi*x2(i))+5;
   y1(i+n)=sqrt(-2*log(x1(i)))*sin(2*%pi*x2(i))+5;
end

// histogramme

subplot(2,1,1)
histplot(20,y1)
fplot2d(x,gauss,style=2)
xtitle('Répartition des valeurs du signal','intensité', 'probabilité')

// signal

subplot(2,1,2)
plot(y1)
xtitle('Signal','temps', 'intensité')

Licensing Edit

I, the copyright holder of this work, hereby publish it under the following license:
Heckert GNU white Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License."
This page uses content from the Wikimedia Commons. The original content was at File:Signal gaussien.png. The list of authors can be seen in the page history. As with this Psychology Wiki wiki, that portion of the content of Wikimedia Commons is available under the GNU Free Documentation License.

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Date/TimeThumbnailDimensionsUserComment
current11:29, November 5, 2007Thumbnail for version as of 11:29, November 5, 2007610 × 461 (4 KB)PhloxBot (Talk | contribs)== Summary == Signal avec un bruit gaussien ; moyenne ''m'' = 5, écart type σ = 1 ---- Signal with a gaussian noise; average ''m'' = 5, standard deviation σ = 1 Auteur/author : Christophe Dang Ngoc Chan (cdang) réalisé a

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