Adaptive gain and filtering circuit for a sound reproduction...

H - Electricity – 03 – H

Patent

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H03H 21/00 (2006.01) H03G 7/00 (2006.01) H04R 25/00 (2006.01)

Patent

CA 2160133

Adaptive compressive gain and level de- pendent spectral shaping circuitry for a hearing aid include a microphone to produce an input signal and a plurality of channels connected to a common circuit output (102). Each channel has a preset frequency response. Each channel includes a filter (F1, F2, F3, F4) with a preset frequency response to receive the input signal (12) and to produce a filtered signal, a channel amplifier to amplify the filtered signal to pro- duce a channel output signal, a threshold regis- ter (34) to establish a channel threshold level, and a gain circuit (24). The gain circuit in- creases the gain of the channel amplifier when the channel output signal falls below the chan- nel threshold level and decreases the gain of the channel amplifier when the channel output signal rises above the channel threshold level. A transducer produces sound in response to the signal passed by the common circuit output.

Des circuits de mise en forme spectrale liée au niveau et de gain de compression adaptatif comportent un microphone destiné à produire un signal d'entrée et plusieurs voies connectées à une sortie (102) de circuit commune. Chaque voie présente une réponse en fréquence préréglée et un filtre (F1, F2, F3, F4) à réponse en fréquence préréglée qui reçoit le signal d'entrée (12) et produit un signal filtré, ainsi qu'un amplificateur de voie qui amplifie le signal filtré pour produire un signal de sortie de voie, un registre (34) de seuil qui établit un niveau de seuil de voie, et un circuit (24) de gain. Ce dernier accroît le gain de l'amplificateur de voie quand le signal de sortie de la voie tombe au-dessous du niveau de seuil de cette voie, et il abaisse le gain de l'amplificateur de voie quand le signal de sortie de la voie dépasse le niveau de seuil de cette voie. Un transducteur produit des sons en réaction au signal transmis par la sortie de circuit commune.

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