Noise spectrum estimation method and apparatus

G - Physics – 01 – R

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G01R 23/16 (2006.01) G01R 29/26 (2006.01) G10L 11/00 (2006.01) G10L 15/20 (2006.01) G10L 21/02 (2006.01) H04B 1/10 (2006.01)

Patent

CA 2502980

A method is provided for recurrently estimating a spectrum of noise at each signal observation interval from a sound signal which contains the noise and which is observed at each signal observation interval. In the method, there are acquired an envelope of a previous spectrum of the noise which has been previously estimated from the sound signal observed at a previous signal observation interval, and an envelope of a current spectrum of the sound signal which is observed at a current signal observation interval subsequent to the previous signal observation interval. Then, a value of correlation is computed between the envelop of the previous spectrum of the noise and the envelope of the current spectrum of the sound signal. A current spectrum of the noise contained in the sound signal observed at the current signal observation interval is estimated in accordance with the computed value of the correlation and based on the previous spectrum of the noise and the current spectrum of the sound signal.

La présente description concerne une méthode permettant d'estimer de manière récurrente un spectre de bruit à chaque intervalle d'observation du signal à partir d'un signal acoustique qui contient le bruit et qui est observé à chaque intervalle d'observation du signal. La méthode suppose l'acquisition d'une enveloppe de spectre de bruit précédent qui a été estimé précédemment à partir d'un signal acoustique observé à un intervalle d'observation de signal précédent, et celle d'une enveloppe d'un spectre du signal acoustique actuel qui est observé à un intervalle d'observation du signal actuel subséquent à l'intervalle d'observation du signal précédent. Ensuite, une valeur de corrélation est calculée entre l'enveloppe du spectre de bruit précédent et celle du spectre du signal acoustique actuel. Un spectre de bruit actuel contenu dans le signal acoustique observé à l'intervalle d'observation du signal actuel est estimé conformément à la valeur calculée de la corrélation et fondé sur le spectre de bruit précédent et le spectre du signal acoustique actuel.

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