Voice signal processing device

G - Physics – 10 – L

Patent

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354/50

G10L 21/02 (2006.01) G10L 11/06 (2006.01)

Patent

CA 2036199

A voice signal which contains noise is cepstrum-analyzed to determine a peak and a mean-value thereof. When a peak which surpasses a given threshold is detected in the signal, the signal is assumed to be a vowel, and when the mean-value of the signal is higher than a specified threshold, the signal is assumed to be a consonant, thereby permitting the voice portion of the signal to be accurately isolated. Further, utilizing that result, noise is accurately canceled from the signal by adjusting a cancel coefficient so that the voice portions of the signal are hardly affected by the noise canceling while pure noise portions of the signal are substantially completely canceled therefrom.

Une analyse cepstrale est effectuée sur un signal vocal comportant du bruit afin de déterminer la valeur de crête et la valeur moyenne de ce signal. Lorsqu'une crête dépassant un seuil donné est détectée, il est supposé que le signal est une voyelle et, lorsque la valeur moyenne du signal est supérieure à un seuil spécifié, il est supposé que le signal est une consonne, ce qui permet d'isoler avec précision la partie voix du signal. En outre, l'utilisation de ce résultat permet de supprimer avec précision le bruit du signal en réglant un indice d'annulation de manière que les parties voix du signal soient à peine touchées par l'annulation du bruit, alors que les parties de bruit pur du signal en sont presque entièrement supprimées.

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