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Esprance:  EMBED Equation.3  Fonction de rpartition:  EMBED Equation.3  Gaussienne:  EMBED Equation.3  (=cart type (0.683 -( ou +() m=valeur moyenne Indpendance de variables alatoires: Si les VA X et Y sont indpendantes, on peut crire EMBED Equation.3  Moments:  EMBED Equation.3   EMBED Equation.3  Moyenne d'un signal sur une dure T0:  EMBED Equation.3  Puissance moyenne d'un signal sur une dure T0:  EMBED Equation.3  Puissance du signal fonction de la Densit Spectrale de Puissance:  EMBED Equation.3  Srie de Fourier: Toute fonction x(t) peut tre dcrite dans une intervalle de priode T, comme une suite de cosinus et sinus, sous la forme  EMBED Equation.3   EMBED Equation.3  (valeur moyenne de x(t) dans l'intervalle)  EMBED Equation.3  (n>0)  EMBED Equation.3  (n>0) Srie de Fourier complexe:  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  Stationnarit: Un processus alatoire est stationnaire si les proprits (moyenne, cart-type) sont indpendantes de l'orgine des temps. 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