Hearing aid with enhanced high frequency reproduction and...

H - Electricity – 04 – R

Patent

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H04R 25/00 (2006.01)

Patent

CA 2611947

A hearing aid (50) comprises means (55, 56, 57, 58) for reproducing frequencies above the upper frequency limit of a hearing impaired user. The hearing aid (50) according to the invention comprises means (55, 57) for transposing higher bands of frequencies from outside the upper frequency limit of a hearing impaired user down in frequency based on a detected frequency in order to coincide with a lower band of frequencies within the frequency range perceivable by the hearing impaired user. The transposing means (55, 57) comprise an adaptive notch filter (15) for detecting a dominant frequency in the lower band of frequencies, adaptation means (16) controlled by the adaptive notch filter (15), an oscillator (3) controlled by the adaptation means (16), and a multiplier (4) for performing the actual frequency transporting of the signal.

La présente invention concerne une prothèse auditive (50) comprenant un organe (55, 56, 57, 58) destiné à reproduire des fréquences au-dessus de la limite supérieure de fréquences d'une personne dont l'audition est dégradée. Cette prothèse auditive (50) comprend un organe (55, 57) destiné à transposer les bandes supérieures de fréquences situées en dehors de la limite de fréquences supérieures de la personne dont l'audition est dégradée par une baisse de fréquences fondées sur une fréquence détectée afin de coïncider avec la bande inférieure des fréquences à l'intérieur de la gamme des fréquences perceptibles par cette personne. L'organe de transposition (55, 57) comprend un filtre coupe-bande adaptatif (15) permettant de détecter une fréquence dominante dans la bande inférieure des fréquences, un organe d'adaptation (16) commandé par ce filtre coupe-bande adaptatif (15), un oscillateur (3) commandé par l'organe d'adaptation (16) et, un multiplicateur (4) permettant de réaliser le transport de fréquences réelles du signal.

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