Method and apparatus for adjustment of the sampling phase in...

Details Method and apparatus for adjustment of the sampling phase in... Method and apparatus for adjustment of the sampling phase in...

H - Electricity

04

B

H04B 1/38 (2006.01) H04L 5/16 (2006.01) H04M 11/06 (2006.01)

Patent

CA 2399075

In a PCM modem system (fig.3), a method and apparatus for optimizing the fractional sampling phase offset in the upstream direction to maximize the upstream data rate utilizes a probing signal (fig. 4A) from the analog modem (12) generated during startup and having at least two distinct phases of a pure tone, with the probing signal (fig. 4A) being detected at the digital modem (14) where an optimum sampling phase value (72) is calculated. From the calculated value (72), a signal representing the appropriate amount to delay the input data is transmitted back to the analog modem (12) for adjustment of the fractional sampling phase so that the fractional sampling phase offset at the central office quantizer (22) is optimized.

L'invention porte sur un procédé et un appareil d'optimisation du déphasage de l'échantillonnage fractionné dans un système de modems MIC dans le sens ascendant pour maximiser le débit ascendant de données, en utilisant un signal de sondage du modem analogique (12) produit pensant le démarrage et présentant au moins deux phases distinctes de tonalité pure, le signal de sondage étant détecté par le modem numérique (14) où se calcule la valeur optimale de la phase d'échantillonnage. A partir de la valeur calculée (72), on retransmet au modem analogique (12) un signal représentant la quantité nécessaire pour la phase d'échantillonnage fractionné dont le déphasage au niveau de quantificateur (22) du bureau central est ainsi optimisée.

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