Efficient prototype filter realizations for cosine-modulated filter bank
نویسندگان
چکیده
Cet article presente des implantations optimisées de filtres prototypes de bancs de filtres modulés à reconstruction parfaite, à retard quelconque. Les implantations proposées sont basées sur des "schémas de liftage". Ici, l’approximation des coefficients "de liftage" est faite de manière à ce que le filtrage n’emploie que peu d’operations de décalage et addition. Comme le "schéma de liftage" est robuste aux erreurs de quantification ainsi introduites, la propriété de recontruction parfaite du banc de filtres est conservée. Le prototype d’origine et celui obtenu par cette methode sont comparés en terme de complexité d’implantation et d’atténuation hors-bande. ABSTRACT
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