Abstract: A control for noise attenuation is provided which is based on signals received at a time that is different than the assigned receiving time slot of the receiver. Thus, the control is not affected by payload information.

Abstract: A modular system for personal data acquisition and communication, is expanded advantageously a cellular telephone system the functions of which can be increased by means of various expansion cards. A host device in the system according to the invention, such as a mobile communication device, need not be equipped with all possible functions in the manufacturing stage but some of the functions can be realized on expansion cards, and the user can add a desired function to the host device according to need. The expansion cards are small and they are installed substantially inside the host device, such as a mobile communication device, so that the entity formed by the host device and the expansion card seems to the user as a single compact device. Advantageously, the expansion cards include, in addition to the hardware needed, also the software required for controlling the operation of the modules.

Abstract: A mobile communications device is constructed to receive an expansion card which provides to the mobile communications device the capability of generating images. The expansion card contains the basic devices, utilities, and control for the imaging function.

Abstract: A data adapter functioning as an intermediary between a data terminal and a digital data transmission network is implemented by using the parts the data terminal usually comprises and by directing their activity by processor commands recorded in the memory of the data terminal.

Abstract: A data adapter functioning as an intermediary between a data terminal and a digital data transmission network is implemented by using the parts the data terminal usually comprises and by directing their activity by processor commands recorded in the memory of the data terminal.

Abstract: A data adapter unit, for converting data signals for IR wireless transmission between electronic devices, containing an IR-electrical converter, and IR and electrical input/output ports, and accommodating a removably connectable device, such as a cellular phone, and a removably connectable data converter such as a PC or cellular data card. The phone, when mounted in the adapter unit, exchanges voice and data signals through an internal interface with the removable PC card which converts the data signals for exchange through either the IR or electrical input/output signal ports. The signal ports communicate the data signals to an external device such as a personal computer or a modem and return signals therefrom. When the electrical port is connected to an outside device, the normal IR transmission is ceased in favor of the electrical output, or this function may be achieved by a user operated switch.