Abstract: The invention relates to a device for listening to voice and/or musical signals by means of cranial bone transmission, comprising a case (8, 15) having a forward frontal face, which is sealed by a flexible membrane (11), and a rear frontal face (15a), which consists of a rigid, hermetic wall, and comprising a piezoelectric element (1) having suitable dimensions in order for same to be integrated in the case, means (18) for supporting the piezoelectric element which are suitable for joining the periphery of the latter to the case in a solid manner, in such a way as to divide the internal volume of the said case into two hermetic chambers: a forward chamber (6) filled with an incompressible gel or fluid, and a rear chamber (7) comprising damping means (28) suitable for compensating the stresses exerted on the piezoelectric element (1) which result from the forces exerted on the flexible membrane (11).

Abstract: A device forming a mouthpiece for a snorkel or diving regulator, adapted to fit in the mouth of a diver or swimming and comprising a body provided with an air intake and extended by two lateral branched each provided with a bite tab, and at least one transducer buzzer positioned in one of the branches and comprising a piezoelectric membrane. Each transducer buzzer comprises a peripheral weight fixed to the periphery of the piezoelectric membrane, and elements for transmitting the vibrations of the membrane towards the teeth of the diver or swimmer. Furthermore, each transducer buzzer is positioned in the branch in such a way that the piezoelectric membrane is totally isolated from the external environment, and that the transmission elements form a contact interface with the teeth at the bite tab.