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The occlusion effect has been reduced using acoustic vents in hearing aids [2]. Acoustic vents allow the sound energy to radiate out of the ear, thus reducing the sound pressure in the ear canal. However, they also allow sound to enter the ear canal as well. This solution is not sufficient for hear-through headphones, since their sound quality is deteriorated by leakage [3]. Moreover, acoustic vents would allow feedback to occur in the hear-through loop. Recently, active noise cancellation (ANC) has been proposed as a solution to the occlusion effect in hearing aids and headphones [4],[5].

Adapted from Aleksi Myöhänen, “Active Occlusion Cancellation for Hear-Through Headphones,” M.Sc. thesis, School of Electrical Engineering, Aalto Univ., Espoo, Finland, 2019. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License