Noise suppression process and device

G - Physics – 10 – L

Patent

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Details

G10L 19/14 (2006.01) G10L 19/02 (2006.01) G10L 21/02 (2006.01)

Patent

CA 2574468

A noise suppression process (S_OUT) for a decoded signal comprising a first decoded signal portion (S_CELP) and a second decoded signal portion (S TDAC) has the following steps: determining a first energy envelope generating curve (ENV_CELP) and a second energy envelope generating curve (ENV_TDAC) of the first signal portion (S_CELP) and of the second decoded signal portion (S_TDAC); forming an identification number (R) depending on a comparison of the first and second energy envelope generating curves (ENV_CELP, ENV_TDAC); deriving an amplification factor (G) which depends on the identification number (R); advantageously multiplying the second decoded signal portion by the amplification factor, which leads to the desired reduction of pre-echo and post-echo interference noises.

La présente invention concerne un procédé pour atténuer le bruit (S_OUT) dans un signal décodé qui se compose d'une première partie de signal décodée (S_CELP) et d'une seconde partie de signal décodée (S_TDAC), le procédé comprenant les étapes suivantes: détermination d'une première courbe d'enveloppe énergétique (ENV_CELP) et d'une seconde courbe d'enveloppe énergétique (ENV_TDAC) de la première partie de signal décodée (S_CELP) et de la seconde partie de signal décodée (S_TDAC); formation d'un indice (R) en fonction de la comparaison entre la première et la seconde courbe d'enveloppe énergétique (ENV_CELP, ENV_TDAC); déduction d'un facteur d'amplification (G) en fonction de l'indice (R); de préférence multiplication de la seconde partie de signal décodée par le facteur d'amplification, ce qui conduit à la réduction souhaitée des bruits parasites de pré-écho et post-écho.

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