METHOD OF DIRECT CONNECTION OF CHANNELS OR CHANNEL GROUPS BETWEEN PREMODULATION SYSTEMS AND PREGROUP MODULATION SYSTEMS

Disclosed is a method for interconnecting one or more adjacent speech channels between a carrier-frequency system in which a basic primary group is obtained by the principle of pre-modulation, and a system in which a basic primary group is obtained by the principle of pre-group modulation. The basic primary group of the pre-modulating system with one of its channel carriers, is converted in such a manner that the channel group to be interconnected reaches the frequency position of an interconnect filter of which the band width corresponds to that of the channel group. The band screened out by the interconnect filter is converted directly, by a carrier of the premodulating system, into the desired frequency position of the basic primary group of the pre-group system.