Earphones that know when they're in the wrong ear

Mixing up your left and right earphones might be one of the most minor annoyances in modern life, but think of the precious few seconds you'd save if it didn't happen. Such stress-free listening could be just around the corner, thanks to researchers at the Igarashi Design Interfaces Project in Tokyo, Japan, who have come up with a pair of "Universal Earphones" that automatically switch audio channels when placed in the wrong ear.

Ensuring the correct stereo match is important for audiophiles who want to hear music as it was originally mixed, as well as film buffs or gamers who enjoy 3D sound to go with their on-screen visuals. It turns out that ear side detection is surprisingly simple, thanks to a proximity sensor attached to one earphone that measures the distance to your ear.

Place the earphone on the right and the sensor points to the back of your head, detecting the ear behind it, while swapping to the left ear means the sensor points in front of you into the open air. A small embedded audio circuit swaps channels when the sensor detects a mismatch.

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