Patent ID: 8379894

Claim:
A hearing aid comprising: an input transducer for deriving an electrical input signal from an acoustic input, a signal processor for generating an electric output signal, an output transducer for transforming the electrical output signal into an acoustic output, an adaptive estimation filter for generating a feedback estimation signal, at least one first adaptive narrow-band filter for narrow-band-filtering an input signal of the signal processor, at least one second adaptive narrow-band filter for narrow-band-filtering a reference signal corresponding to an input signal of the adaptive estimation filter, an adaptation mechanism for updating the filter coefficients of the adaptive estimation filter based on the output signals of the first and second narrow-band filters, wherein the filters of the first and second adaptive narrow-band filters are each configured as a cascade of individual filter stages, and each configured to minimize a single shared cost function, and wherein the cost function derived from an output signal of the last filter stage is fed back to each individual filter stage of the cascade of filter stages.