Hearing aid, and a method for control of adaptation rate in...

H - Electricity – 04 – R

Patent

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H04R 25/00 (2006.01)

Patent

CA 2647462

A hearing aid comprises at least one microphone (M) for converting input sound into an input signal, a subtraction node for subtracting a feedback cancellation signal from the input signal thereby generating a processor input signal, a hearing aid processor (G) for producing a processor output signal by applying an amplification gain to the processor input signal, a receiver (R) for converting the processor output signal into output sound, an adaptive feedback cancellation filter for adaptively deriving the feedback cancellation signal from the processor output signal by applying filter coefficients, calculation means for calculating the autocorrelation of a reference signal, and an adaptation means for adjusting the filter coefficients with an adaptation rate, wherein the adaptation rate is controlled in dependency of the autocorrelation of the reference signal.

Cette invention concerne un appareil auditif comprenant au moins un microphone (M) conçu pour transformer un son d'entrée en un signal d'entrée, un noeud de soustraction conçu pour soustraire un signal d'annulation de rétroaction d'un signal d'entrée, produisant, ainsi, un signal d'entrée de processeur, un processeur (G) pour appareil auditif conçu pour produire un signal de sortie de processeur par application d'un gain d'amplification au signal d'entrée de processeur, un récepteur (R) conçu pour convertir le signal de sortie de processeur en un son de sortie, un filtre d'annulation de rétroaction adaptatif conçu pour obtenir sélectivement le signal d'annulation de rétroaction à partir du signal de sortie de processeur par application de coefficients de filtre, un moyen de calcul conçu pour calculer l'autocorrélation d'un signal de référence, et un moyen d'adaptation conçu pour réguler les coefficients de filtre avec une vitesse d'adaptation, la vitesse d'adaptation étant régulée en fonction de l'autocorrélation du signal de référence.

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