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## 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)

```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

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 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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• ### Signal-to-noise ratio

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Date/Time Thumbnail Dimensions User Comment current 11:29, November 5, 2007 610 × 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