Patent ID: 6898293
Filing Date: 2005-05-24
Classification: H04R

Abstract:
1. A hearing aid comprising an input transducer for transforming an acoustic input signal into a first electrical signal, a first combining node for receiving said first electrical signal and combining it with a third electrical signal in order to output a first combining node output signal, a processor for generation of a second electrical signal by processing of said first combining node output signal, an output transducer for transforming the second electrical signal into an acoustic output signal, a first adaptive filter with first filter coefficients for estimation of acoustic feedback by generation of a third electrical signal by filtering of said second electrical signal, wherein the first filter coefficients are updated with a first convergence rate, a second adaptive filter with second filter coefficients for filtering said second electrical signal into a fourth electrical signal, means for determining a maximum allowable gain of said processor, and a second combining node for generation of a fifth electrical signal by combining the fourth electrical signal with the first combining node output signal and for inputting the fifth electrical signal to said second adaptive filter, wherein the second filter coefficients are updated with a second convergence rate.