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élimination d'un signal sous matlab

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skill87 Messages postés 11 Date d'inscription samedi 3 décembre 2011 Statut Membre Dernière intervention 13 décembre 2012 - 20 avril 2012 à 13:39
Char Snipeur Messages postés 9813 Date d'inscription vendredi 23 avril 2004 Statut Contributeur Dernière intervention 3 octobre 2023 - 25 avril 2012 à 10:20
Bonjour,

voila je travaille actuellement dans mon stage sur le vtraitement de données issue d'un capteur , mais malheureusement je ne suis pas trop doué dessus ( a la base le stage devait etre sur labview) mais bon
donc voila le probleme j'ai des donnée issue d'un capteur stockée dans un fichier texte (ca c fait ), ensuite en representant les resultats je me suis rendu compte qu'a intervale regulier j'avais un impulsion de sinchronisation (un trigger) .
donc pour l'eliminer a chaque fois ?
si quelqu'un pouvvait m'aider.
ps: je trouve pas comment ajouter un fichier joint, donc si quelqu'un a une iddée je lui enverai par mail.
merci infiniment

7 réponses

Réponse 1 / 7
Char Snipeur Messages postés 9813 Date d'inscription vendredi 23 avril 2004 Statut Contributeur Dernière intervention 3 octobre 2023 1 298
20 avril 2012 à 15:59
Salut.
Il faut en premier lieu caractériser ton trigger en amplitude et/ou en fréquence.
Si son amplitude est très supérieur à la normal, il suffit de faire une sélection par seuil : tout les données au dessus de ce seuil sont du trigger et sont donc ignorés.
Si la fréquence est très régulière, tu peux essayer de faire une transformé de fourier, modifier le spectre (annulé les fréquences liées au trigger) puis faire la transformée inverse.
Une autre technique peut fonctionné si le trigger est très net : détecté les front montant et descendant (gradient élevé) et supprimer tout ce qu'il y a entre les deux.
0
Réponse 2 / 7
skill87 Messages postés 11 Date d'inscription samedi 3 décembre 2011 Statut Membre Dernière intervention 13 décembre 2012
23 avril 2012 à 17:05
merci char snipeur pour ta reponce
j'ai effectivement fait un seuilage en amplitude, ensuite j'ai effectuer une derivé sur le signal pour retrouver les coordonnée de mon trigger 
x=find(math>9);
y=diff(x);

pour pouvoir faire un fenetrage (c-a-d) ne garder que les resultat entre chaque trigger. c la que je coince quelqu'un peut m'aider .
merci
0
Char Snipeur Messages postés 9813 Date d'inscription vendredi 23 avril 2004 Statut Contributeur Dernière intervention 3 octobre 2023 1 298
23 avril 2012 à 19:23
où coinces tu ? dans le 'split' de ton vecteur ?
0
Réponse 3 / 7
skill87 Messages postés 11 Date d'inscription samedi 3 décembre 2011 Statut Membre Dernière intervention 13 décembre 2012
24 avril 2012 à 11:08
bonjour.
quesque tu entend par 'split' ?
merci.
0
Char Snipeur Messages postés 9813 Date d'inscription vendredi 23 avril 2004 Statut Contributeur Dernière intervention 3 octobre 2023 1 298
24 avril 2012 à 11:36
en fait je ne comprend pas ça :
pour pouvoir faire un fenetrage (c-a-d) ne garder que les resultat entre chaque trigger
donne un petit exemple STP.
0
Réponse 4 / 7
skill87 Messages postés 11 Date d'inscription samedi 3 décembre 2011 Statut Membre Dernière intervention 13 décembre 2012
24 avril 2012 à 17:21
bonjour
voila le programme que j'ai fait pour l'instant 
clear all
close all
X1=[];
X=importdata('MOCA_BRUT120120305_195708.txt');
% Première étape extraction entre 2 trigger
Y=find(X>9);
Z=diff(Y);
W=find(Z>1);
for i=1:length(W)
    TRAIT=X(Y(W(i)):Y(W(i))+Z(W(i)));
    if length(TRAIT)>=1595
    X1(:,i)=TRAIT(1:1595);
    end
end

malheureusement le fichier des données fait 57 MB (impossible a uploader)
mais je met un partie des données sous forme de code 
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Réponse 5 / 7
Char Snipeur Messages postés 9813 Date d'inscription vendredi 23 avril 2004 Statut Contributeur Dernière intervention 3 octobre 2023 1 298
25 avril 2012 à 08:15
Salut. 
X1=[];
X=importdata('MOCA_BRUT120120305_195708.txt');
% Première étape extraction entre 2 trigger
Y=find(X>9); % récupère tout les indices de X appartenant au trigger
Z=diff(X>9); %%  permet de détecter les changements 
W=find(Z>0);%% W les indice de passage de trigger à signal
V=find(Z<0);%% V les indices de passage de signal à trigger
V=[1;V]; %% je suppose qu'on commence par du signal
for i=1:length(W)
    TRAIT=X(V(i):W(i));
    if length(TRAIT)>=1595
    X1(:,i)=TRAIT(1:1595);
    end
end
reste à traiter le début de X. et je ne suis pas sur du sens que tu donne à tout. Mais ça t'aidera peut être.
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Réponse 6 / 7
skill87 Messages postés 11 Date d'inscription samedi 3 décembre 2011 Statut Membre Dernière intervention 13 décembre 2012
25 avril 2012 à 09:50
merci char snipeur de ta reponse , en effet j'aurrait du mettre des commentaire et mieux nommé mes variables, ce ke j'essayé de faire c'etait de trouver la postion de mes trigger dans mes donnés en faisons un seuillage (variable Y), ensuite j'effectue une derivation de Y cela me donne Z, Z contient la plupart du temp des 1 sauf au position correspondant au moment au le signal change de signe, ensuite je n'est qu'a recuperer ces données en effectuens un notre seuillage (W)
ensuite je fait une boucle dont le nombre d'iteration est egale a la taille de W
est a chaque fois je recupere la partie du signal entre chaque trigger( Y(W(1)-1) correspond a l'indice du premier trigger et Z(W(1)) est la distance separent le trigger 1 et 2.

pour le reste je dois faire un 2 eme traitement identique mais cette fois en eliminons les 2 rais restante et en gardons la partie centrale qui contient l'information utiles.
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Char Snipeur Messages postés 9813 Date d'inscription vendredi 23 avril 2004 Statut Contributeur Dernière intervention 3 octobre 2023 1 298
25 avril 2012 à 10:20
dérivé les index du trigger (variable Y) n'a, à mon avis, aucun intéret. D'où ma modification en gras. Ma façon de faire, c'est de dérivé le signal "seuilé" X>9 qui vaut 1 (erreur dans ce que j'ai fait, j'ai inversé les signes) lorsqu'on passe de signal à trigger et -1 de trigger à signal. Ceci te permet de bien repérer les changements. Ensuite, dans les variables V et W je met les index de changement qu'il ne me reste plus qu'à utiliser pour récupérer la parti de X qui est intéressante.
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Réponse 7 / 7
skill87 Messages postés 11 Date d'inscription samedi 3 décembre 2011 Statut Membre Dernière intervention 13 décembre 2012
25 avril 2012 à 09:51
ensuite je faire de meme pour un autre fichier de données , et convolué le resultat des 2, ensuite realiser un traitement sur les données et afficher une forme 3D
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