| abstract |
Sound transmission device with selective filtering, comprising a mouthpiece, provided with a valve and a bore, intended to be put in place in the external auditory canal, said mouthpiece being produced by molding of the auditory canal carried out by taking imprint and manufacture of a counter mold.n n n The device comprises, placed in the bore (2), a tube (3) opening into the residual cavity (7) existing between the end piece (1) and the eardrum (4) and extended at its external end by an acoustic valve ( 8) inserted partially or completely into a housing (6) formed in the end piece (1) and delimiting at least one resonance cavity (10,11). |