Patent ID: 8208650

Claim:
A method of providing feedback-based ANR in an earpiece of a personal ANR device, the method comprising: monitoring a sound level of environmental noise sounds detected by an external microphone disposed on an external portion of the personal ANR device; increasing a degree of the feedback-based ANR provided in response to the external microphone detecting a higher sound level; decreasing the degree of the feedback-based ANR provided in response to the external microphone detecting a lower sound level; and wherein: increasing the degree of the feedback-based ANR provided comprises altering at least one filter coefficient of at least one filter employed in providing the feedback-based ANR to increase a range of frequencies of the environmental noise sounds attenuated by the feedback-based ANR; and decreasing the degree of the feedback-based ANR provided comprises altering the at least one filter coefficient of the at least one filter to decrease the range of frequencies of the environmental noise sounds attenuated by the feedback-based ANR.