Patent ID: 8416959

Claim:
A circuit comprises: a microphone circuit operably coupled to: receive acoustic vibrations in a proximal environment; and generate an audio signal based on the acoustic vibration; an audio processing module operably coupled to generate a representation of the audio signal; a digital audio processing module operably coupled to compensate the representation of the audio signal based on hearing compensation data to produce a hearing compensated audio signal; and an active noise reduction (ANR) circuit including: an ANR microphone circuit operably coupled to: receive the output audio signal; and generate an ANR signal based on the output audio signal; a first filter operably coupled to high pass filter the hearing compensated audio signal to produce a filtered hearing compensated audio signal; a summing module operably coupled to sum the filtered hearing compensated audio signal and the ANR signal to produce a summed audio signal; a second filter operably coupled to filter the summed audio signal to produce a filtered summed audio signal; an operational amplifier having an inverting input, a non-inverting input, and an output, wherein the non-inverting input receives the summed audio signal and the output outputs an output audio signal; a feedback filter operably coupled to filter the output audio signal to produce a feedback signal; and a third filter operably coupled to high pass filter the hearing compensated audio signal to produce a high pass filtered hearing compensated audio signal, wherein the feedback signal and the high pass filtered hearing compensated audio signal are received by the inverting input of the operational amplifier.