ACTIVE NOISE REDUCTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an improved noise reduction system including a headphone, in which mechanical protection of a microphone is secured, and which is comfortable for a user.SOLUTION: An active noise reduction system including an earphone is provided. The earphone includes: a cup-like housing with an aperture; a transmitting transducer which converts electrical signals into acoustical signals to be radiated to a user's ear and which is arranged at the aperture of the cup-like housing thereby defining an earphone cavity; a receiving transducer which converts acoustical signals into electrical signals and which is arranged within the earphone 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 receiving transducer and which has a second transfer characteristic; and a control unit which is electrically connected to the receiving transducer and the transmitting transducer and which compensates for ambient noise by generating a noise reducing electrical signal supplied to the transmitting transducer.