Variable frequency signal generating method

H - Electricity – 03 – K

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H03K 3/80 (2006.01) G06F 1/03 (2006.01)

Patent

CA 2081757

A Direct Digital Synthesis type variable frequency signal generator generates a jitter free and stable output signal regardless of the address interval. If the total number of addressable memory locations of a memory storing digital data is divisible without remainder by an initial address interval, then the memory is read every initial address interval with a clock signal of a predetermined frequency. If the total number of addressable memory locations is not divisible without remainder by the initial address interval, then the address interval is modified to a value that is divisible without remainder into the total number of addressable memory locations and the clock frequency is modified in accordance with this modification of the address interval. The memory is read every modified address interval with the modified clock signal.

Un générateur de signaux à fréquence variable de type Direct Digital Synthesis (synthèse numérique directe) produit un signal de sortie exempt de scintillement quelle que soit l'intervalle d'adresses. Si le nombre total d'emplacements mémoire adressables d'une mémoire de données numériques est divisible sans reste par un intervalle d'adresses initial, la mémoire est lue pour chaque intervalle d'adresses initial au top d'un signal d'horloge avec une fréquence prédéterminée. Si le nombre total d'emplacements de mémoire adressables n'est pas divisible sans reste par l'intervalle d'adresses initial, cet intervalle est modifié afin que la division du nombre total d'emplacements adressables soit divisible sans reste, et le fréquence d'horloge est modifiée en conséquence de cet intervalle d'adresses. La mémoire est lue pour chaque intervalle d'adresses modifié au top du signal d'horloge modifié.

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