G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 21/02 (2006.01)
Patent
CA 2304571
The invention concerns a method which consists in carrying out a spectral subtraction comprising: a first subtraction step taking into account the maximised estimations (B'¿n,i?) of the noise spectral components, so as to obtain spectral components (S?2¿¿n,f?) of a first enhanced signal; computing a masking curve (M¿n,q?) by applying an auditory perception model based on the first enhanced signal spectral components; and a second subtraction step which consists in subtracting respectively, from each spectral component of the speech signal on the frame, a quantity depending on the parameters including a variation between the maximised estimation of the corresponding spectral component of the noise and the computed masking curve. A transform towards the time domain is applied to the result of the subtraction to construct an enhanced speech signal.
On effectue une soustraction spectrale comportant: une première étape de soustraction dans laquelle on tient compte d'estimations majorées (B'n,i) des composantes spectrales du bruit, de manière à obtenir des composantes spectrales (S2n,f) d'un premier signal débruité; le calcul d'une courbe de masquage (Mn,q) en appliquant un modèle de perception auditive à partir des composantes spectrales du premier signal débruité; et une seconde étape de soustraction dans laquelle on soustrait respectivement, de chaque composante spectrale du signal de parole sur la trame, une quantité dépendant de paramètres incluant un écart entre l'estimation majorée de la composante spectrale correspondante du bruit et la courbe de masquage calculée. On applique au résultat de la soustraction spectrale une tranformation vers le domaine temporel pour construire un signal de parole débruité.
Lockwood Philip
Lubiarz Stephane
Fetherstonhaugh & Co.
Matra Nortel Communications
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