Sub-packet insertion for packet loss compensation in voice...

Details Sub-packet insertion for packet loss compensation in voice... Sub-packet insertion for packet loss compensation in voice...

H - Electricity

04

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H04L 1/00 (2006.01) G10L 19/00 (2006.01) H04L 12/56 (2006.01) H04L 12/66 (2006.01) H04L 29/06 (2006.01) H04M 1/253 (2006.01) H04M 11/06 (2006.01) H04Q 3/64 (2006.01) H04H 20/82 (2009.01)

Patent

CA 2372209

A method of compensating within a receiving endpoint for lost audio packets transmitted across an IP network, comprising the steps of storing a packet buffer of samples as a plurality of sub packets within a jitter buffer, inserting at least one interpolated sub packet between successive sub packets in the buffer, and playing out the sub packets from the buffer, such that only small portions of the fitter buffer are replayed at specific times to minimize the negative effects on voice quality. The inventive method inserts the replayed portions to compensate for packet loss in a way that results in only a relatively low processing burden.

L'invention concerne un procédé conçu pour compenser à l'intérieur d'un point terminal de réception des paquets audio perdus émis sur un réseau IP. Ledit procédé consiste à stocker un tampon de paquets d'échantillons comme pluralité de sous paquets à l'intérieur d'un tampon anti-instabilité; à insérer dans le tampon au moins un sous paquet interpolé entre des sous paquets successifs; et à lire les sous paquets à partir du tampon. Ainsi seules de petites parties du tampon anti-instabilité sont relues à des moments spécifiques, ce qui réduit les effets négatifs sur la qualité vocale. Les parties relues sont donc insérées afin de compenser une perte de paquets et ne donnent lieu qu'à une charge de traitement relativement faible.

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