Harmonic noise weighting in digital speech coders

G - Physics – 10 – L

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G10L 19/00 (2006.01) G10L 19/02 (2006.01)

Patent

CA 2542137

To address the need for choosing values of harmonic noise weighting (HNW) coefficient (.epsilon.p) so that the amount of harmonic noise weighting can be optimizex, a method and apparatus for performing harmonic noise weighting in digital spech coders is provided herein. During operation, received speech is analyzed (503) to determine a pitch period. HNW coefficients are then chosen (505) based on the pitch period, and a perceptual noise weighting filter (C(z)) is determined (507) based on the harmonic-noise weighting (HNW) coefficients (.epsilon.p).

Afin de satisfaire au besoin de sélection de valeurs d'un coefficient de pondération du bruit d'une harmonique (PBH) (e¿p?) de manière que la quantité de pondération du bruit d'une harmonique puisse être optimisée, on prévoit un procédé et un appareil de réalisation de la pondération du bruit d'une harmonique dans des codeurs vocaux numériques. Entre temps, les paroles reçues sont analysées (503) afin de déterminer une période de pas. Les coefficients PBH sont ensuite sélectionnés (505) d'après la période de pas et un filtre de pondération de bruit perceptif (<i>C(z)</i>) est déterminé (507) d'après les coefficients (e¿p?) de pondération de bruit d'une harmonique (PBH).

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