Patent ID: 8184822

Claim:
A personal ANR device comprising: a first earpiece; a first feedback microphone disposed within the first earpiece; a first feedforward microphone disposed on an external portion of the personal ANR device; a first acoustic driver disposed within the first earpiece; and a first ANR circuit structured to: receive a first feedback reference signal representing feedback reference sounds from the first feedback microphone; generate first feedback anti-noise sounds from digital data representing at least the first feedback reference signal; receive a first feedforward reference signal from the first feedforward microphone; generate first feedforward anti-noise sounds from digital data representing at least the first feedforward reference signal; receive a pass-through audio signal from an audio source; generate first modified pass-through audio sounds from digital data representing at least the pass-through audio signal; split the first modified pass-through audio sounds into lower frequency sounds and higher frequency sounds at a crossover frequency; combine the lower frequency sounds with one of the feedback reference sounds and the feedback anti-noise sounds, and combine the higher frequency sounds with the other one of the feedback reference sounds and the feedback anti-noise sounds, wherein the selectable crossover frequency may be selected to route the entirety of the modified pass-through audio sounds to be combined with one of the feedback reference sounds and the feedback anti-noise sounds; and output a first output signal conveying the first feedback anti-noise sounds, the first feedforward anti-noise sounds and the first modified pass-through audio sounds to be acoustically output by the first acoustic driver.