Patent ID: 8130992
Filing Date: 2012-03-06
Classification: H04R

Abstract:
1. A hearing aid having a proximal end and a distal end, where at least part of the hearing aid is adapted to be inserted into an ear canal of a user such that the distal end and the tympanic membrane in the ear canal define a residual space of the ear canal, the hearing aid comprising: an ambient space input transducer adapted to convert ambient sound to an electric sound signal, when the ambient sound reaches the ear of the user from an ambient space; a processor connected to said ambient space input transducer and adapted to process said electric sound signal; an output transducer connected to said processor and adapted to convert said processed electric sound signal to a sound pressure in said residual space; and a residual space input transducer connected to said processor and arranged to predominantly receive said sound pressure in the residual space, wherein the residual space input transducer is adapted to convert said sound pressure to an electric residual space signal for compensating acoustic feedback, and said processor is configured to determine a first anti-feedback transfer function defined between said processed electric sound signal and said electric residual space signal and determined using a first time constant, and to determine a second anti-feedback transfer function defined between said electric residual space signal and said electric sound signal using a second time constant.