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Traitement du Signal Le Filtrage Numérique - PRIMA

Traitement du Signal Le Filtrage Numérique - PRIMA

Traitement du Signal Le Filtrage Numérique - PRIMA

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<strong>Le</strong> <strong>Filtrage</strong> Numérique Séance 4filtre passe bandeH*(ω)ω–π –ω 2 –ω 1 ω 1 ω 2 π*W(ω)–π π=H(ω)ωω–π πH(ω) = H s (ω) * W(ω) = [rect(ω) - rect(ω)] * sin(Nω/2)sin(ω/2) . e–jω(N–1)/4Filtre pass bande par mo<strong>du</strong>lationUn autre approche de la conception d'un filtre passe bande :-π -ω o ω o π -π -ω o ω o πH s (ω) = δ(±ω o )Pour taille N : h(n) = cos(ωn) . wN (n) donc H(ω) = 1 2 δ(±ω o) * sin(ωN/2)sin(ω/2)4-22

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