Patent ID: 8744103
Filing Date: 2014-06-03
Classification: H04R

Abstract:
1. A method of reducing feedback in a hearing device, the hearing device comprising a receiver and a microphone, wherein a feedback path exists between the receiver and the microphone, wherein the hearing device further comprises an adaptive feedback canceller configured to reduce the feedback, the adaptive feedback canceller comprising a fixed filter corresponding to an invariant portion of the feedback path, and an adaptive filter corresponding to a variant portion of the feedback path, the method comprising: providing the invariant portion of the feedback path to the fixed filter of the hearing device; and modeling the feedback using the invariant portion and the variant portion using the fixed filter and the adaptive filter; wherein the invariant portion of the feedback path is provided to the fixed filter of the hearing device independently of an actual user using the hearing device; and wherein the providing comprises calculating the invariant portion as a common part of a plurality of measured feedback paths, wherein the plurality of measured feedback paths are measured on a plurality of users for a type of hearing device substantially identical to the hearing device within production tolerances.