Patent ID: 8903101
Filing Date: 2014-12-02
Classification: G10K

Abstract:
1. An active noise reduction system, comprising: an earphone to be acoustically coupled to an ear of a user, the earphone comprising a first acoustical path that extends from the transmitting transducer to the ear, and that has a first transfer function characteristic indicative of acoustics of the first acoustical path; a second acoustical path that extends from the transmitting transducer to the receiving transducer, and that has a second transfer function characteristic indicative of acoustics of the second acoustical path; and a control unit electrically connected to the receiving transducer and the transmitting transducer, and that compensates for ambient noise by generating a noise reducing electrical signal that is supplied to the transmitting transducer; where the noise reducing electrical signal is derived from a filtered electrical signal, which is provided by filtering the second electrical signal with a third transfer function characteristic; and where the second and the third transfer function characteristics together model the first transfer function characteristic, where the filtered electrical signal is indicative of audio at a virtual receiving transducer position located acoustically downstream of the transmitting transducer.