Active noise reduction system

Details Active noise reduction system Active noise reduction system

G - Physics

10

L

G10L 21/02 (2006.01) H04R 1/10 (2006.01)

Patent

CA 2726315

An active noise reduction system is presented which in-cludes an earphone to be acoustically coupled to a user's ear exposed to noise. The earphone has a cup-like housing with an aperture; a transmitting transducer for converting electrical signals into acoustical signals to be radiated to the user's ear is arranged at the aperture of the cup--like housing thereby defining an earphone cavity; and a re-ceiving transducer which converts acoustical signals into electrical signals and which is arranged within the ear-phone cavity; a first acoustical path which extends from the transmitting transducer to the ear and which has a first transfer characteristic; a second acoustical path which extends from the transmitting transducer to the re-ceiving transducer and which has a second transfer charac-teristic; and a control unit which is electrically con-nected to the receiving transducer and the transmitting transducer and which compensates for the ambient noise by generating a noise reducing electrical signal supplied to the transmitting transducer. The noise reducing electrical signal is derived from the receiving-transducer signal fil-tered with a third transfer characteristic and the second and third transfer characteristics together model the first transfer characteristic.

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