Transmission device of the sound is selective filtering, intended to be put into place in the external ear canal.

摘要

Transmission device of the sound to selective filtering, comprising a connector provided with a hole intended to be put into place in the external ear canal. & br / the ferrule (1) is made by molding of the auditory canal, carried out by taking an impression and the manufacture of a counter - mold, and it comprises, placed in the bore (2), a tube (3) which opens into the cavity of the residual (7) that exists between the ferrule (1) and the eardrum (4) and extended at its outer end by an acoustic valve (8) inserted partially or totally in the ferrule (1) and defining or not at least one resonant cavity (8 ′).