Abstract: A set of devices including: at least one receiver and at least one portable device, the receiver including a mechanism receiving a multichannel signal capable of preserving a part of the signal transmitted on a particular channel allowing information to be received, a conversion mechanism associated with a propagation mechanism broadcasting the information, and a communication mechanism; a portable object including an electronic module, the electronic module including at least a calculation unit and a wireless communication circuit to communicate with the communication mechanism of the receiver. The portable object can detect, via the wireless communication circuit, presence of at least one receiver belonging to the set of devices and acting on the at least one receiver to change the particular channel and to select a particular channel whose identifier or whose program currently being broadcast has at least one identifier identical to the identifier programmed in the portable object.

Abstract: A set of devices including: at least one receiver and at least one portable device, the receiver including a mechanism receiving a multichannel signal capable of preserving a part of the signal transmitted on a particular channel allowing information to be received, a conversion mechanism associated with a propagation mechanism broadcasting the information, and a communication mechanism; a portable object including an electronic module, the electronic module including at least a calculation unit and a wireless communication circuit to communicate with the communication mechanism of the receiver. The portable object can detect, via the wireless communication circuit, presence of at least one receiver belonging to the set of devices and acting on the at least one receiver to change the particular channel and to select a particular channel whose identifier or whose program currently being broadcast has at least one identifier identical to the identifier programmed in the portable object.

Abstract: A piezoelectric resonator of small dimensions comprises a vibrating element mounted in a tight sealed housing (1) of elongated shape. The housing comprises a base (10) onto which a metal cap (9) is fixed, and coupling conductors (11) which pass through the base to connect the vibrating element to the exterior of the housing. The metal cap is formed by a part in the shape of a rectangular parallepiped which has, in its lengthwise direction, a cylindrical axial blind hole. This shape allows the cap to have a much better mechanical resistance than that of a conventional cylindrical cap and allows the resonator to be easily mounted, in an automatic manner, onto a support.