Digital decoding of biphase-mark encoded serial digital signals

H - Electricity – 03 – M

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H03M 7/00 (2006.01) H03M 5/12 (2006.01)

Patent

CA 2139548

-10- A digital decoder for a biphase-mark encoded serial digital signal detects edges in the encoded serial digital signal by sampling with a sample clock to produce a blivet signal. The blivet signal is filtered by a one-bit digital lowpass filter (16) to recover a decoded clock signal and to generate a transition window signal. The blivet and window signals are used to detect whether there is a transition within each bit interval defined by the decoded clock signal. A decoded serial digital signal has a logical one for each bit interval in which a transition occurs, and a logical zero otherwise.

Décodeur numérique de signal numérique série à codage biphasé détecte les contours du signal numérique série codé en effectuant un échantillonnage au moyen d'une horloge d'échantillonnage afin de produire un signal BLIVET. Ce dernier est filtré au moyen d'un filtre passe-bas numérique à un bit (16) afin de récupérer un signal d'horloge décodé et de générer un signal WINDOW de transition. Les signaux BLIVET et WINDOW servent à détecter s'il y a une transition à l'intérieur de chaque intervalle binaire défini par le signal d'horloge décodé. Un signal numérique série décodé comporte un « un » logique pour chaque intervalle binaire dans lequel se produit une transition, et un zéro logique dans les autres cas.

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