Method and apparatus comprising synchronizing means for...

H - Electricity – 04 – Q

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H04Q 11/04 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2302952

There are voice signals from at least two voice sources which are multiplexed by an ATM Adaptation Layer 2 multiplexer (AAL2 MUX) into the same ATM connection after having been processed by a packetizing means such that the AAL2 MUX is presented with assembled AAL2 packets of a suitable periodicity. If the voice data signals are to be compressed, the packetizing means comprises an encoder of a suitable voice codec, e.g. ADPCM, GSM, LD-CELP or CS- ACELP. The voice encoders may also include means for silence removal. The packetizing means further comprises a packetizer, either separated from the voice encoder, or as a part thereof. The packet releases from the packetizing means are synchronized to occur virtually simultaneously. In this way, the released packets from the packetizing means arrive almost simultaneously at the AAL2 MUX, with the result that an ATM cell may be filled with AAL2 packets well before the expiration of the timer Timer-CU of the AAL2 MUX.

Les signaux vocaux provenant d'au moins deux sources vocales sont multiplexés par un multiplexeur à couche d'adaptation MTA 2 (AAL2 MUX) dans la même connexion MTA, après avoir été traités par un module de mise en paquets, de sorte que le multiplexeur AAL2 MUX reçoit des paquets AAL2 assemblés d'une périodicité appropriée. Si les signaux vocaux de données sont destinés à être comprimés, le module de mise en paquets comprend un codeur pourvu d'un codec vocal approprié, par exemple ADPCM, GSM, LD-CELP, ou CS-ACELP. Ces codeurs vocaux peuvent en outre comprendre des modules d'élimination des silences. Le module de mise en paquets peut en outre comprendre une unité de mise en paquets soit séparée dudit codeur vocal, soit intégrée à celui-ci. Les envois de paquets provenant de ce module de mise en paquets sont synchronisés de manière à se produire presque simultanément. Ainsi, ces envois de paquets provenant du module de mise en paquets arrivent presque simultanément au multiplexeur AAL2 MUX, permettant ainsi de remplir une cellule MTA avec les paquets AAL2 bien avant l'expiration du délai Timer_CU dudit AAL2 MUX.

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