Distinguishing received a-law and .mu.-law signals in a pcm...

H - Electricity – 04 – B

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H04B 1/38 (2006.01) H04B 14/04 (2006.01) H04J 3/12 (2006.01) H04L 23/00 (2006.01) H04L 23/02 (2006.01) H04L 25/49 (2006.01) H04L 27/04 (2006.01) H04L 27/10 (2006.01) H04L 27/20 (2006.01) H04L 27/36 (2006.01)

Patent

CA 2360777

A method in a modem having a frame having a plurality of slots, for determining whether incoming DIL sequence information contains A-law or mu-law is provided. From the DIL sequence information, an ordered table of levels for each slot is generated. The levels of all non-robbed-bit slots are averaged, and average levels are subjected to an A-law/mu-law separation function. The separation function F1(n1,n2)=sum from i=n1 to i=n2 {L(i) - 2* [L(i-16]} effectively compares values of a first plurality of levels L(i) to twice the values of a second plurality of levels sixteen levels removed from the first plurality of levels (420). The sum is compared to a threshold (430), as the sum will be small for A-law values and large for mu-law values.

Cette invention concerne un procédé qui permet de déterminer, dans un modem avec trame à pluralité de tranches de temps, si l'information à séquence DIL entrante est régie par une loi A ou une Loi µ. A partir de l'information à séquence DIL, on génère une table ordonnée de niveaux pour chaque tranche de temps. On calcule la moyenne des niveaux de toutes les tranches sans signalisation par réassignation de bit, les niveaux moyens étant soumis à une fonction de séparation. La fonction de séparation F1 (n1, n2)=sum from i=n1 to i=n2 {L(i) - 2* [L(i-16]} permet de comparer effectivement des valeurs d'une première pluralité de niveaux L(i) à deux fois les valeurs d'une seconde pluralité de niveaux, soit seize niveaux retranchés de la première pluralité de niveaux (420). On compare la somme à un seuil (430), étant entendu que cette somme est faible en Loi A et importante en Loi µ.

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