Gain-smoothing in wideband speech and audio signal decoder

G - Physics – 10 – L

Patent

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G10L 19/14 (2006.01) G10L 19/08 (2006.01)

Patent

CA 2391562

The gain smoothing method and device modify the amplitude of an innovative codevector in relation to background noise present in a previously sampled wideband signal. The gain smoothing device comprises a gain smoothing calculator for calculating a smoothing gain in response to a factor representative of voicing in the sampled wideband signal, a factor representative of the stability of a set of linear prediction filter coefficients, and an innovative codebook gain. The gain smoothing device also comprises an amplifier for amplifying the innovative codevector with the smoothing gain to thereby produce a gain-smoothed innovative codevector. The function of the gain-smoothing device improves the perceived synthesized signal when background noise is present in the sampled wideband signal.

La présente invention concerne un procédé et un dispositif de lissage de gain modifiant l'amplitude d'un nouveau vecteur de code par rapport au bruit de fond présent dans un signal à large bande préalablement échantillonné. Ce dispositif de lissage de gain comprend un calculateur de lissage de gain servant à calculer un tel lissage en réaction à un facteur représentant la voix dans le signal à large bande échantillonné, un facteur représentant la stabilité d'un ensemble de coefficients de filtre de prédiction linéaire, et un nouveau gain de table de code. Le dispositif de lissage de gain comprend également un amplificateur servant à amplifier le nouveau vecteur de code au moyen du lissage de gain, et ce afin de produire un nouveau vecteur de code à gain lissé. La fonction du dispositif de lissage de gain améliore le signal synthétisé perçu lorsque le bruit de fond est présent dans le signal à large bande échantillonné.

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