Do not put more than 65 characters per line of formula !
"abs(wvillea(x,y))"
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"Calcul d'un spectrogramme d'un sample"
"y doit varier de 0 … Fr‚quence_d'‚chantillonage/4"
"x varie de 0 … Dur‚e_de_l'‚chantillon"
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_____________________ Optionnal ______________________
"0.1*dua 0.9*dua"
"0 0.9*fra/4"
"? ?"
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"41 0 0"
