US Patent 9591395 Earphones and earbuds with physiologic sensors

An earphone with a physiologic sensor includes a housing; a speaker in the housing; an enhancer comprising a body mounted on the housing and adapted to be secured in the ear to acoustically couple the speaker to the user's ear; and an optical physiologic sensor disposed inside the enhancer, the enhancer having an aperture or window aligned with the optical physiologic sensor, so that the sensor can optically couple with the user's ear when the enhancer is secured in the user's ear.