Patent ID: 9654854
Date: 2017-05-16
CPC Classifications: H04R

Claim:
1. An in-ear device comprising: a housing adapted for location in or adjacent to an auditory canal, the housing having an acoustic outlet for location in the auditory canal; a driver provided in the housing, the driver having a first acoustic impedance; an acoustic path within the housing extending from the driver to the outlet; a microphone provided in the acoustic path between the driver and the outlet, a second acoustic impedance provided around the periphery of the microphone and in the acoustic path, the second acoustic impedance greater than the first acoustic impedance, wherein the second acoustic impedance is such that the acoustic impedance of the in-ear device from the driver input to the microphone output over a selected audio frequency range is greater than the first acoustic impedance over the selected audio frequency range; and a third acoustic impedance at the acoustic outlet, the acoustic outlet formed by a tube, the tube having a length longer than its diameter.