A hear-through option in earphones exists when the earphone has a microphone mounted on the outside of the earphone thus allowing the user to hear the surroundings -- or not. Although routing the microphone signal to the earphone driver is relatively straightforward, the physical presence of the earphone will modify the natural acoustics of the external ear, and some form of compensation is required to make the microphone-earphone combination acoustically transparent. Here we derive a general expression for the design target response of insert earphones with hear-through options emphasizing the differences that originate from non-individual approximations. Measurements are performed on a selected number of insert earphones and compared to the proposed design target response.
Authors:
Hoffmann, Pablo F.; Christensen, Flemming; Hammershøi, Dorte
Affiliation:
Aalborg University, Aalborg, Denmark
AES Conference:
51st International Conference: Loudspeakers and Headphones (August 2013)
Paper Number:
3-4
Publication Date:
August 21, 2013
Subject:
Headphones
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