Methods and devices for noise conditioning signals...

Details Methods and devices for noise conditioning signals... Methods and devices for noise conditioning signals...

H - Electricity

04

B

H04B 1/12 (2006.01) G10L 19/00 (2006.01) H03H 17/00 (2006.01) G10L 19/06 (2006.01)

Patent

CA 2262787

The present invention relates to methods and devices for processing data frames representative of audio information in digitized and compressed form. The method comprises the steps of classifying succesive data frames into frames containing speech sounds and non-speech sounds, altering parameters of the data frames identified as containing non-speech sounds for eliminating or at least substantially reducing artifacts that distort the acoustic background noise. In addition, the data frame identified as containing non-speech sounds are low-pass filtered. Finally, a signal level compensation is effected to avoid undesired fluctuations in the signal level.

La présente invention concerne des procédés et des dispositifs pour traiter des trames de données représentatives d'informations audio sous forme comprimée et numérisée. Ce procédé comprend les étapes consistant à classer les trames de données successives en trames contenant des sons vocaux et des sons non vocaux, et à modifier les paramètres des trames de données identifiées comme contenant des sons non vocaux pour éliminer, ou au moins sensiblement réduire, les artéfacts qui font subir une distorsion au bruit de fond acoustique. En outre, les trames de données identifiées comme contenant des sons non vocaux sont filtrées au filtre passe-bas. En fin, une compensation de niveau de bruit est effectuée pour éviter les fluctuations indésirables dans le niveau des signaux.

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