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Signal_bruite_cumule.png(610 × 461 pixels, file size: 5 KB, MIME type: image/png)

Summary Edit

Cumul du signal dans le temps pour éliminer la partie aléatoire et garder la partie constante.

  1. valeur instantanée du signal I(t)
  2. valeur cumulée du signal \int_0^\tau I(t)\cdot dt
  3. valeur moyenne du signal \frac{1}{\tau} \cdot \int_0^\tau I(t)\cdot dt

Accumulation of the signal with the time to eliminate the random noise and keep the constant part

  1. instant value of the signal I(t)
  2. cumulated value of the signal \int_0^\tau I(t)\cdot dt
  3. average value of the signal \frac{1}{\tau} \cdot \int_0^\tau I(t)\cdot dt

Auteur/author : Christophe Dang Ngoc Chan (cdang)

Réalisé à l'aide/made with help of Scilab

clear;clf;
n=25; // moitié du nombre de points aléatoires

// 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

// signal cumulé et moyenne

y2(1)=y1(1);y3(1)=y1(1);
for i=2:2*n
   y2(i)=y2(i-1)+y1(i);
   y3(i)=y2(i)/i;
end

// signal

subplot(3,1,1)
plot(y1)
xtitle('Signal','temps', 'intensité')

// signal cumulé

subplot(3,1,2)
plot(y2)
xtitle('Signal cumulé','temps', 'intégrale de l''intensité')

// signal moyen

subplot(3,1,3)
plot(y3)
xtitle('Moyenne temporelle du signal','temps', 'moyenne de l''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 bruite cumule.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/TimeThumbnailDimensionsUserComment
current11:29, November 5, 2007Thumbnail for version as of 11:29, November 5, 2007610 × 461 (5 KB)PhloxBot (Talk | contribs)== Summary == Cumul du signal dans le temps pour éliminer la partie aléatoire et garder la partie constante. # valeur instantanée du signal <math>I(t)</math> # valeur cumulée du signal <math>\int_0^\tau I(t)\cdot dt</math> # valeur moyenne du signal

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