Patent ID: 8218801
Filing Date: 2012-07-10
Classification: H04R

Abstract:
1. A device for reducing interference for a hearing aid device, comprising: a housing including an inner wall and an outer wall, at least one of the inner and outer wall provides partial electromagnetic shielding; a sense coil located within the inner wall of the housing in proximity to the hearing aid device, the sense coil operable for sensing a magnitude, polarization and a polarity of an inbound interfering magnetic field within the housing; and an induction coil located between the outer wall and the inner wall of the housing, the induction coil operable for generating an outbound magnetic field having the same polarization and an opposing polarity to the polarity of the inbound interfering magnetic field, wherein the outbound magnetic field is of a magnitude substantially equal to the magnitude of the inbound interfering magnetic field such that the induction coil substantially nullifies the interfering magnetic field within the hearing aid device.