System and method for adaptive microphone matching in a...

H - Electricity – 04 – R

Patent

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H04R 25/00 (2006.01)

Patent

CA 2581118

A directional hearing aid (100) comprising at least two microphones (201, 202) has means (200) for matching differences in amplitude and phase between the two microphones (201, 202). The microphone matching means (200) compare differences between measured transfer functions of the microphone signal paths at a number of frequencies during use of the hearing aid (100), compares the differences to differences at similar frequencies in a model of the transfer functions of the microphone signal paths, derives a set of parameters based on the comparison, and adjusts the parameters in order to minimize the difference in level differences between the model and the microphones (201, 202). The model is then used to match the microphones (201, 202) mutually by applying appropriate control parameters (103, 104, 105, 106) to an adaptive matching filter (108) carrying one of the microphone signals.

L'invention concerne une aide auditive directionnelle (100) comprenant au moins deux microphones (201, 202) et renfermant une unité (200) destinée adapter les différences de phase et d'amplitude entre les deux microphones (201, 202). L'unité d'adaptation de microphones (200) compare les différences entre des fonctions de transfert mesurées des trajets des signaux des microphones à un nombre de fréquences donné pendant l'utilisation de l'aide auditive (100), compare les différences avec des différences à des fréquences similaires dans un modèle des fonctions de transfert des trajets des signaux des microphones, dérive un ensemble de paramètres sur la base de cette comparaison, et ajuste les paramètres en vue d'une réduction de la différence de différences de niveau entre le modèle et les microphones (201, 202). Le modèle est ensuite utilisé pour adapter les microphones (201, 202) de manière réciproque par application de paramètres de commande appropriés (103, 104, 105, 106) en vue d'une adaptation adaptative du filtre (108) véhiculant l'un des signaux des microphones.

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