Abstract: A Smart Card Based System for telephone-securized transactions. The system includes a telephone terminal (10) connected to a server (30) and a package or unit (40) incorporating a keypad (42), a smart card (48) and sound signal transmission device. The transmission of the information of the card to the server takes place by way of sound signals and the telephone terminal. In the other direction, the information is addressed in vocal manner to the user, who types them on the keypad (42) of the unit (40). Application to securized teletransactions, particularly electronic funds transfer.

Abstract: A dielectric resonator ultra-high frequency filter tunable in a large band width in which each dielectric resonator is constituted by a dielectric component with a high dielectric constant, which is fixed relative to an enclosure and a component made from the same dielectric material which is movable relative to the first component, in such a way that the distance d between facing surfaces of these two dielectric components varies, leading to a variation in the tuning frequency of the filter by modifying the coupling conditions.