Personal active acoustic attenuation process and device,...

G - Physics – 10 – K

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G10K 11/178 (2006.01)

Patent

CA 2218399

A selected electrical signal is first applied to the input of a source (30) to determine at least the impulse response (H), over a predetermined time, between the source output and the input of sensors (20). The values of the active cancellation control signal are determined in real time according to a predetermined law established in accordance with the previously determined impulse response (H), whereby the energy of the output signal from the sensors is minimised. The acoustic structure (2) is arranged so that the space (534) containing the sensors (20) and the source (30) is invariant at least during the determination of the active cancellation control signal and in the presence of a person, whereby the impulse response (H) between the output of the source (30) and the input of the sensors (20) may remain invariant.

On applique, au préalable, un signal électrique choisi à l'entrée de la source (30), pour déterminer au moins la réponse impulsionnelle (H), pendant une durée prédéterminée, entre la sortie de la source et l'entrée des moyens capteurs (20). On détermine, en temps réel, les valeurs du signal de commande d'atténuation active, selon une loi prédéterminée, établie selon la réponse impulsionnelle (H) ainsi préalablement déterminée pour minimiser l'énergie du signal délivré par les moyens capteurs. On aménage la structure acoustique (2) pour maintenir invariant, au moins pendant la détermination du signal de commande d'atténuation active et en présence de l'individu, le volume (534) dans lequel sont logés les moyens capteurs (20) et la source (30), ce qui permet de maintenir invariant la réponse impulsionnelle (H) entre la sortie de la source (30) et l'entrée des moyens capteurs (20).

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