Counting pulse generator for telephone exchanges - has evaluating element becoming operative at coincidence of zone and generator pulses

摘要

In order to evaluate centrally evaluated zones, and to allocate them to the counting pulse generator, by which the code number has been evaluated, timing pulses are allocated to the zones and to the counting pulse generator. The counting pulse generator timing pulses have a width sufficient to cover all zone pulses. An electronic evaluating element is allocated to each zone, permitting a coincidence evaluation. It becomes operative when zone and counting pulse generator pulses appear simultaneously, and sets a bistable electronic device in its operated position. It delivers a clock pulse train allocated to the evaluated zone.