Patent ID: 6466679
Filing Date: 2002-10-15
Classification: H04R

Abstract:
A hearing aid comprising:an input transducer which receives incoming acoustic signals and converts said incoming acoustic signals into electrical signals; a processing stage connected to said input transducer and supplied with said electrical signals for processing said electrical signals and adapting said electrical signals to a hearing disability of a hearing-impaired person, for producing processed signals at an output of the processing stage; an earphone connected via a signal line to said output of said processing stage which converts said processed signals into output acoustical signals, said earphone having a magnetic field associated therewith; a selectively operable induction coil connected to said processing stage, for inductively receiving signals and for converting the inductively received signals into a current supplied to said processing stage for inclusion in said processed signals; and a compensation inductance connected in said signal line between said output of said processing stage and said earphone, said compensation inductance generating a compensation magnetic field opposite to the magnetic field generated by said earphone, for actively shielding said earphone from said induction coil to prevent said magnetic field generated by said earphone from being inductively coupled to said induction coil.