Patent ID: 7254245

Claim:
A method for reciprocal adaptation of a plurality of microphones of a hearing device, comprising the steps of: receiving incoming audio signals respectively with a plurality of microphones, with each microphone generating an output signal dependent on the audio signals received by that microphone, said microphones having respectively different sensitivities such that a difference exists between a first output signal from a first of said plurality of microphones and a second output signal from a second of said plurality of microphones; measuring a first amplitude of said first output signal in a predetermined frequency range; measuring a second amplitude of said second output signal in said predetermined frequency range; and reducing said difference by filtering said first output signal dependent on said first amplitude and on said second amplitude in a filter by multiplying filtering said first output signal with a transfer function of said filter having a numerator polynomial and a denominator polynomial, and in a feedback regulation loop containing said filter, varying only said numerator polynomial in said feedback regulation loop to equalize said first and second amplitudes.