Hearing aid digital automatic gain control

H - Electricity – 04 – R

Patent

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Details

H04R 25/00 (2006.01)

Patent

CA 2430777

Systems, devices, and methods are provided to inhibit apparent amplitude modulation in non-linear processing that causes distortion in a processed signal. One aspect of the invention includes a hearing aid. The hearing aid includes a microphone to receive an input signal, a speaker to reproduce the input signal, and a processor. The processor processes the input signal using a gain. The processor includes an inhibitor, which inhibits distortions, and an adjuster, which adjusts the gain. The inhibitor acts to smooth en envelope of the input signal to inhibit undesired modulation. The adjuster adjusts the gain if the envelope is either above or below a threshold. The hearing aid further includes a compression recapture system to supply the compressed portion of the input signal to more closely reproduce the actual input signal.

La présente invention concerne des systèmes, des dispositifs et des procédés qui permettent d'inhiber la modulation d'amplitude apparente dans un traitement homomorphique qui entraîne une distorsion du signal traité. Dans un de ses aspects, l'invention concerne un appareil de correction auditive qui comprend un microphone destiné à recevoir un signal d'entrée, un haut-parleur destiné à reproduire le signal d'entrée et un processeur. Le processeur traite le signal d'entrée à l'aide d'un gain. Le processeur précité comprend un élément d'inhibition qui inhibe les distorsions et un élément de réglage qui règle le gain. L'élément d'inhibition sert à lisser l'enveloppe du signal d'entrée afin d'inhiber une modulation non désirée. L'élément de réglage règle le gain si l'enveloppe se trouve au-dessus ou au-dessous d'un seuil. L'appareil de correction auditive comprend en outre un système de récupération de compression qui fournit la partie comprimée du signal afin de reproduire plus fidèlement le véritable signal d'entrée.

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