Auditory prosthesis with user-controlled feedback cancellation

Details Auditory prosthesis with user-controlled feedback cancellation Auditory prosthesis with user-controlled feedback cancellation

H - Electricity

04

R

H04R 25/00 (2006.01) H04R 27/02 (2006.01)

Patent

CA 2100015

44307CAN3A ABSTRACT OF THE DISCLOSURE Apparatus and method for canceling feedback in an auditory prosthesis. An input filter includes an adaptive filter which can be user activated to provide rapid adaption of the filtering characteristics. A probe generator may generate a predetermined signal to introduce a known component in the input signal via the feedback path during rapid adaption. the filter characteristics are adapted in response to a reference signal containing a component of the predetermined signal and a component of the output of the amplifier. An alternate embodiment adds to the reference signal an unwanted noise component taken from the input signal wherein the filter characteristics adapt to filter an unwanted noise in the input signalprovided that adaption is actuated when the unwanted noise is predominant in the input signal. Both embodiments include a slow adaption mode wherein the filter characteristics are slowly adapted between intervals of rapid adaption to provide adjustments to gradual changes in the characteristics of the feedback path or the unwanted noise.

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