Hearing system and method implementing binaural noise...

H - Electricity – 04 – R

Patent

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H04R 25/00 (2006.01)

Patent

CA 2648851

The binaural hearing system (1) comprises -ITF means (3a; 3b) for providing at least one interaural transfer function (30a;30b); - noise reduction means (5a; 5b) for performing noise reduction in dependence of said at least one interaural transfer function. The method of operating a binaural hearing system (1) comprises the steps of -providing at least one interaural transfer function (30a; 30b); -performing noise reduction in dependence of said at least one interaural transfer function. Preferably, said noise reduction means (5a; 5b) comprises two binaural Wiener filters (5a, 5b) each having a cost function comprising at least one term describing a desired interaural transfer function, wherein said at least one interaural transfer function provided by said ITF means (3a, 3b) is assigned to said at least one term. Preferably, said cost function comprises a speech distortion term, a residual noise term and two ITF terms for preserving the interaural transfer functions of speech and noise components. This allows to preserve binaural cues while reducing noise.

L'invention concerne un système auditif biaural (1) comprenant un moyen ITF (3a; 3b) pour fournir au moins une fonction de transfert interaurale (30a; 30b), ainsi qu'un moyen de réduction de bruit (5a; 5b) pour réduire le bruit en fonction de ces fonctions de transfert interaurales. Le procédé pour faire fonctionner un tel système auditif biaural (1) consiste à fournir au moins une fonction de transfert interaurale (30a; 30b) et réduire le bruit en fonction de ces fonctions de transfert interaurales. De préférence, le moyen de réduction de bruit (5a; 5b) comprend deux filtres de Wiener biauraux (5a, 5b) ayant chacun une fonction de coût comprenant au moins un terme décrivant une fonction de transfert interaurale recherchée, lesdites fonctions de transfert interaurales fournies par ledit moyen ITF (3a, 3b) étant affectées auxdits termes. De préférence, ladite fonction de coût comprend un terme de distorsion de parole, un terme de bruit résiduel et deux termes ITF pour préserver les fonctions de transfert interaurales des composantes de parole et de bruit. L'invention permet de préserver les repères biauraux tout en réduisant le bruit.

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