G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 21/02 (2006.01) G10L 19/04 (2006.01)
Patent
CA 2244008
The invention relates to a linear prediction audio signal processing apparatus, such as a vocoder, including a nonlinear filter to attenuate the residual signal used to excite a linear prediction synthesis filter. The nonlinear filter is capable of reducing the noise component in the signal while keeping only the periodic component of the speech signal. This feature enhances speech quality. The invention also extends to a novel method for processing a residual signal used to excite a linear prediction synthesis filter in order to attenuate wide band additive noise in the speech signal as constructed by the synthesis filter.
Cette invention concerne un appareil de traitement de signal audio à prédiction linéaire, de type vocodeur, équipé d'un filtre non-linéaire qui lui permet d'atténuer le signal résiduel utilisé pour exciter un filtre de synthèse à prédiction linéaire. Le filtre non-linéaire est en mesure de réduire la composante du bruit du signal en ne conservant que la composante périodique du signal vocal, caractéristique qui améliore la qualité vocale. Cette invention porte également sur une méthode innovatrice de traitement de signal résiduel; elle permet d'exciter un filtre de synthèse à prédiction linéaire afin d'atténuer le bruit d'insertion large bande faisant partie du signal vocal produit par le filtre de synthèse.
Nortel Networks Limited
Northern Telecom Limited
Smart & Biggar
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