Delayed packet concealment method and apparatus

H - Electricity – 04 – L

Patent

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Details

H04L 12/56 (2006.01) H04L 12/64 (2006.01)

Patent

CA 2329176

A decoder improves delayed packet concealment in a packet network by using two decoder sections. A first decoder section (30) bases its decoding during the concealment phase on erroneous filter states and a set of speech parameters, whereas a second decoder section bases its decoding on saved (36) and updated filter states and the same speech parameters. The outputs of the two decoder sections are thereafter combined (34) to form the final speech signal. This decoding strategy produces a speech signal with smooth transitions from delayed to non-delayed packets and uses information from the most recent packets for speech generation.

L'invention concerne un décodeur qui améliore le masquage retardé des paquets d'un réseau de paquets à l'aide de deux sections décodeur. Une première section décodeur (30) base son décodage pendant la phase de masquage sur des états de filtres erronés et sur un ensemble de paramètres parole, tandis qu'une deuxième section décodeur base son décodage sur des états de filtres sauvegardés (36) et actualisés et sur les mêmes paramètres parole. Les sorties des deux sections de décodeur sont ensuite combinées (34) pour former le signal parole final. Cette stratégie de décodage produit un signal parole aux transitions douces des paquets retardés vers les paquets non retardés et utilise des informations des paquets les plus récents pour la génération de la parole.

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