Compression systems for hearing aids

H - Electricity – 04 – R

Patent

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Details

H04R 25/00 (2006.01)

Patent

CA 2268918

A hearing aid circuit using an averaging detector (60) and a plurality of time constants (62) to produce a compression control signal (64) to control the gain of a compression amplifier (16) which compresses an input signal when the averaging detector signal exceeds a predetermined threshold. The compression control signal has an attack and release time. The release time of the compression control signal is proportional to the duration of time during which the averaging signal's amplitude exceeds the predetermined threshold level. The release has a variable recovery rate. The recovery rate being relatively fast during an initial portion of the release time and relatively slower during the remaining portion of the release time. The hearing aid circuit may also use a volume control (18) to adjust the gain of the signal produced by the compression amplifier (16) without adjusting the gain of the signal produced by a linear amplifier (14) to provide volume control for soft sounds independent of loud sounds.

Circuit de prothèse auditive mettant en application un détecteur de moyennes (60) et une pluralité de constantes de temps (629 afin de produire un signal de commande de compression (64) servant à commander le gain d'un amplificateur de compression (16) qui comprime un signal d'entrée quand le signal de détecteur de moyennes dépasse un seuil prédéterminé. Ce signal de commande compression possède un temps d'attaque et un temps de relâchement. Ce dernier est proportionnel à la durée pendant laquelle l'amplitude du signal de moyennes dépasse le niveau de seuil prédéterminé. Le relâchement présente une vitesse de récupération variable. La vitesse de récupération est relativement rapide pendant une partie initiale du temps de relâchement et relativement plus lente pendant la partie restante du temps de relâchement. Ce circuit peut également utiliser une commande de volume (18) afin de régler le gain du signal produit par l'amplificateur de compression (16) sans régler le gain du signal produit par un amplificateur linéaire (14), de manière à commander le volume de sons doux indépendants des sons forts.

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