Method and system for speech frame error concealment in...

G - Physics – 10 – L

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G10L 19/14 (2006.01) H04L 1/00 (2006.01)

Patent

CA 2424202

A method and system for concealing errors in one or more bad frames in a speech sequence as part of an encoded bit stream received in a decoder. When the speech sequence is voiced, the LTP-parameters in the bad frames are replaced by the corresponding parameters in the last frame. When the speech sequence is unvoiced, the LTP-parameters in the bad frames are replaced by values calculated based on the LTP history along with an adaptively-limited random term.

La présente invention concerne un procédé et un système permettant de masquer des erreurs sur une ou plusieurs mauvaises trames dans une séquence de parole faisant partie d'un train de bits codé reçu dans un décodeur. Lorsque la séquence de parole est voisée, les paramètres de prédiction à long terme des mauvaises trames sont remplacés par les paramètres correspondants dans la dernière trame. Lorsque la séquence de parole est non voisée, les paramètres de prédiction à long terme dans les mauvaises trames sont remplacés par des valeurs calculées basées sur l'historique de la prédiction à long terme ainsi que sur un terme aléatoire limité de manière adaptée.

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