Abstract: An audio system comprises an audio producing device and a headphone or a headset. The audio producing device transmits to the headphone or the headset left and right analog signals intended respectively for left or right analog speakers, and transmits to the headphone or the headset a power supply signal. The headphone or the headset comprises at least one digital microphone and means for superimposing digital data, resulting from sound captures performed by each digital microphone, on top of said left analog signal or on top of said right analog signal or on top of said power supply signal. The audio producing device further comprises means for separating the digital data from said left analog signal or from said right analog signal or from said power supply signal for further processing by the audio producing device. The audio producing device further comprises means for superimposing a clock signal intended to drive each digital microphone on top of said left and/or right analog signal.

Abstract: A piezoelectric insert is provided comprising a membrane (1) formed from a substrate (2) and two piezoelectric material layers (3, 4) whose external surfaces are metallized so as to form the electrodes (5, 6). The membrane comprises a radial excrescence (15) whose upper and lower faces are nipped between the clip shaped legs of connectors (22, 23). The electric connection of the electrodes thus requires no soldering.

Abstract: The present invention provides an insert (1) forming an independent assembly of a coil body (15). The electroacoustic transducer comprises an insert (1) formed of a case with a vibrating membrane (2) and its electric connectors (4, 5) and a coil body (15) distinct and separable from the insert. The coil body can be fitted to the rear face (14) of the insert and comprises axial passages (20, 21) through which the insert connectors (4, 5) pass. Contact pieces (22, 23) provide the electric connection of the coil with the insert connectors.