G - Physics – 10 – K
Patent
G - Physics
10
K
G10K 11/16 (2006.01) A61F 11/14 (2006.01) H04R 1/10 (2006.01) H04R 25/00 (2006.01)
Patent
CA 2197661
An ear device protects a user from damaging sound levels while permitting the user to hear and understand conversation in a noisy environment. The device includes an enclosure system for at least partially isolating the user's ear drums from ambient sounds, at least one directional microphone, an adaptive band pass filter and a speaker. The adaptive band pass filter further includes adaptive high pass and adaptive low pass filters which adaptively and independently control the range of the pass band depending upon the characteristics of the noise in the user's environment. A speaker transmits the processed signal to the user. The adaptive filter also includes a detector connected to receive the processed signal which controls the gain of the system to prevent over-compresssion of the audio signal. The adaptive filter further includes an adaptive compression circuit utilizing multiple time constants to control the response time of the adaptive filter under various conditions.
Un dispositif pour protéger les oreilles de l'utilisateur contre des niveaux sonores dangereux pour l'ouïe permet à cet utilisateur d'entendre une conversation dans un environnement bruyant. Le dispositif comprend un système d'enceinte qui isole les tympans au moins partiellement contre les bruits ambiants, au moins un microphone directionnel, un filtre à bande passante ajustable et un haut-parleur. Le filtre à bande passante ajustable comprend en outre un filtre passe-haut et un filtre passe-bas ajustables qui permettent, d'une manière indépendante, de modifier la plage de la bande passante en fonction des caractéristiques du bruit dans l'environnement de l'utilisateur. Un haut-parleur transmet le signal traité à l'utilisateur. Le filtre ajustable comprend également un détecteur prévu pour recevoir le signal traité, qui ajuste le gain du système pour empêcher une surcompression du signal audio. Le filtre ajustable comprend en outre un circuit de compression ajustable utilisant des constantes de temps multiples pour la commande du temps de réponse du filtre ajustable dans différentes conditions.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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