phénomène d'aliasing


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PDF Chapitre 1 ´Echantillonnage et anti-aliasing

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PDF L « Aliasing »

L 'Aliasing est une interférence qui survient chaque fois qu'un système pulsatile observe un autre système pulsatile et que leurs fréquences vibratoires sont 

  • Comment éviter l'aliasing ?

    Le repliement de spectre (aliasing en anglais) est un phénomène qui introduit, dans un signal qui module une fréquence porteuse ou dans un signal échantillonné, des fréquences qui ne devraient pas s'y trouver, lorsque la fréquence porteuse ou la fréquence d'échantillonnage sont inférieures à deux fois la fréquence

  • C'est quoi le repliement d'un signal ?

    Fréquence Nyquist d'un signal continu x : Soit Fmax est la plus petite fréquence (lorsqu'elle existe) telle que x soit `a bande limitée sur [−Fmax,Fmax].
    Alors, la fréquence Nyquist de x est 2Fmax.
    Soit x(t) un signal continu `a bande limitée, sa fréquence Nyquist est 2Fmax.

aliasing n. angl. désigne en français une situation où un signal indésirable dérivé de celui qu'on a transmis apparaît mélangé à celui-ci.
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