Patent ID: 8358797
Filing Date: 2013-01-22
Classification: H04R

Abstract:
1. A device, comprising: at least one microphone for receiving an input sound; a digital signal processor connected to the microphone for producing a digital processor output signal; a speaker for converting the digital processor output signal into output sound; an external feedback path between the speaker and the microphone that can selectively be made abnormal by the device user; an adaptive internal feedback cancellation system, implemented in the digital signal processor, for continually monitoring and responsively adapting to the abnormal change occurring in the external feedback path; a detection algorithm, implemented in the digital signal processor, to detect an abnormal change in an external feedback path at least two parameter settings for adjusting characteristics of the device; and a feedback path detection switch for switching the device to a different parameter setting in response to output from the detection algorithm wherein the device is a hearing aid.