Electromagnetic feedback reduction in communication device

Details Electromagnetic feedback reduction in communication device Electromagnetic feedback reduction in communication device

2006-12-26

2006-12-26

Grier, Laura A. (Department: 2615)

Electrical audio signal processing systems and devices

Hearing aids, electrical

Noise compensation circuit

C381S312000, C381S093000, C381S096000

Reexamination Certificate

active

07155022

ABSTRACT:
The invention relates to a method for reducing feedback caused by electromagnetic interference between an induction coil and an output transducer, a voltage supply or an amplifier or a combination thereof, the method comprising: producing by means of a filter an equivalent of an electromagnetic feedback path in a system with a pickup coil and subtraction of the equivalent of the feedback signal from the input signal in order to obtain feedback reduction. The invention further relates to a device for implementing the method, the device comprising an induction coil and an output transducer, voltage supply or an amplifier or a combination thereof. The device further comprises filter means for generating an equivalent of an electromagnetic feedgack signal occurring between the induction coil and an output transducer, a voltage supply or an amplifier or a combination thereof and means for subtracting the equivalent from an input signal in order to obtain feedback reduction.

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