Vocoder and associated method that transcodes between mixed...

G - Physics – 10 – L

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G10L 19/14 (2006.01)

Patent

CA 2656130

A vocoder and method transcodes Mixed Excitation Linear Prediction (MELP) encoded data for use at different speech frame rates. Input data is converte (100) into MELP parameters such as used by a first MELP vocoder. These parameters are buffered (102) and a time interpolation (104) is performed on the parameters with quantization to predict spaced points. An encoding function (106) is performed on the interpolated data as a block to produce a reduction in bit-rate as used by a second MELP vocoder at a different speech frame rate than the first MELP vocoder.

L'invention concerne un vocodeur et un procédé permettant de transcoder des données codées en prédiction linéaire à excitation mixte (MELP) destinées à être utilisées à des vitesses de trame vocale différentes. Les données d'entrée sont converties (100) en paramètres MELP, utilisés par un premier vocodeur MELP. Ces paramètres sont mis en mémoire tampon (102) et une interpolation temporelle (104) est effectuée sur les paramètres avec une quantification pour prédire des points espacés. Une fonction de codage (106) est effectuée sur les données interpolées sous forme de bloc pour générer une réduction du débit binaire, tel qu'utilisé par un second vocodeur MELP à une vitesse de trame vocale différente de celle du premier vocodeur MELP.

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