Rf broadcasting employing sinusoidal-cosine wave generation...

G - Physics – 06 – F

Patent

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G06F 1/02 (2006.01)

Patent

CA 2606597

An RF broadcasting system is presented that employs sinusoidal wave generation with look-up tables. The system includes a base band signal generator that converts a received N bit digital base band signal into an N bit digital address based on the base band signal. A signal processor is included having a plurality of addressable look-up tables that provide sinusoidal wave generating data, each of the tables receiving the address and providing therefrom multi-bit wave generating data. The processor also includes multipliers and summer means all configured and arranged to perform the algorithm: Cos[a + b] = Cos[a] ~ Cos[b] - Sin[a] ~ Sin[b] or the algorithm: Sin [a + b] = Cos[b] ~ Sin[a] + Cos [a] ~ Sin[b] for use in the generation .

La présente invention concerne un système de radiodiffusion RF utilisant la génération d'ondes sinusoïdales au moyen de tables de recherche. Le système décrit dans cette invention comprend un générateur de signaux de bande de base qui convertit un signal de bande de base numérique à N bits reçu en une adresse numérique à N bits fondée sur le signal de bande de base. Un processeur de signaux est incorporé dans le système décrit dans cette invention, lequel processeur comprend plusieurs tables de recherche adressables fournissant des données de génération d'ondes sinusoïdales, chacune des tables recevant l'adresse et fournissant, à partir de celle-ci, des données de génération d'ondes multi-bits. Le processeur comprend également des multiplicateurs et des moyens sommateurs tous configurés et conçus pour exécuter l'algorithme: Cos[a + b] = Cos[a] Cos[b] - Sin[a] ~ Sin[b] ou l'algorithme: Sin [a + b] = Cos[b] Sin[a] + Cos [a] Sin[b] utilisable lors du processus de génération.

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