Patent ID: 6219427
Filing Date: 2001-04-17
Classification: H04R

Abstract:
A hearing aid comprising:a microphone for converting sound into an audio signal;feedback cancellation means including means for modelling a signal processing feedback signal to compensate for an estimated physical feedback signal;subtracting means, connected to the output of the microphone and the output of the feedback cancellation means, for subtracting the signal processing feedback signal from the audio signal to form a compensated audio signal;hearing aid processing means, connected to the output of the subtracting means, for processing the compensated audio signal;speaker means, connected to the output of the hearing aid processing means, for converting the processed compensated audio signal into a sound signal;wherein said feedback cancellation means forms a feedback path from the output of the hearing aid processing means to the input of the subtracting means and includes an adaptive filter having filter coefficients; andmeans for setting a maximum stable gain value in said hearing aid processing means, based upon the filter coefficients of the feedback cancellation means.