Abstract: An asymmetrical digital subscriber line (ADSL) system for transferring an analog audio signal and high speed digital data on the side of a subscriber, from and to a station, through one ADSL subscriber line, includes an apparatus on the subscriber side which converts an analog audio signal into a digital audio signal. The apparatus includes a line concentrator to concentrate the audio signal together with high-speed digital data by time division, and supplied to the subscriber line after modulation. An apparatus on the station side simultaneously supplies a signal received from the subscriber side to an analog telephone network, and supplies high-speed digital data to a high-speed digital data network. Each digital audio signal as well as each high-speed digital data is converted into asynchronous transfer mode (ATM) cells in each respective line concentrator, and each destination address is attached to the ATM cells.

Abstract: To provide a subscriber unit applied to a subscriber radio communication system wherein internal parameters of the subscriber unit can be easily and correctly set optionally without providing any manipulation switch or connecting any manipulation console to the subscriber unit, the subscriber unit comprises: a communication module for transferring data to be exchanged between a base unit and a subscriber terminal; a parameter setting unit for setting internal parameters of the subscriber unit according to contents of parameter setting data; and a data switching unit for discriminating a special calling signal to require setting of the internal parameters, and transferring data following the special calling signal to the parameter setting unit as the parameter setting data until a setting end code is found in the data.

Abstract: Coefficients each corresponding to the radical numbers of 2 are generated by a coefficient generator based on the secondary Booth algorithm. Based on the coefficients, partial products of a multiplicand are calculated by a partial product generator and converted into positive numbers by adders. A corrective bit of "1" is added by an adder to the least significant bit of those bits to which "1" has been added by the conversion of partial products into positive numbers, and the sum of partial products corresponding to the radical numbers of 2, i.e., a multiplication result, is determined by adders.