G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 21/02 (2006.01) G10L 11/04 (2006.01)
Patent
CA 2304015
The invention concerns a method for suppressing noise in a digital speech signal processed by successive frames which consists in: computing the signal spectral components (S¿n,f?, S¿n,i?) on each frame; computing the maximised estimations (B'¿n,i?) of spectral components of the noise included in the speech signal; carrying out a harmonic analysis of the signal to estimate a pitch; carrying out a spectral subtraction comprising at least a step consisting in subtracting respectively, from each spectral component of the speech signal on the frame (S¿n,f?), a quantity depending on parameters including the maximised estimation of the noise corresponding spectral component and the estimated pitch; and applying to the subtraction result a transform towards the time domain to construct an enhanced speech signal (s?3¿).
Pour débruiter un signal de parole numérique traité par trames successives: on calcule des composantes spectrales (Sn,f, Sn,i) du signal sur chaque trame; on calcule des estimations majorées (B'n,i) de composantes spectrales du bruit compris dans le signal de parole; on effectue une analyse harmonique du signal pour estimer une fréquence tonale; on effectue une soustraction spectrale comportant au moins une étape consistant à soustraire respectivement, de chaque composante spectrale du signal de parole sur la trame (Sn,f), une quantité dépendant de paramètres incluant l'estimation majorée de la composante spectrale correspondante du bruit et la fréquence tonale estimée; et on applique au résultat de la soustraction spectrale une transformation vers le domaine temporel pour construire un signal de parole débruité (s3).
Lockwood Philip
Lubiarz Stephane
Fetherstonhaugh & Co.
Matra Nortel Communications
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